MAX5096AATE+ - Maxim Integrated Products, Inc.

General Description

The MAX5096/MAX5097 easy-to-use, Dual Mode™,

DC-DC converters operate as LDO (low dropout) or

switch-mode buck converters. At a high output load,

the converters operate as high-efficiency pulse-width-

modulated (PWM) switch-mode converters and reduce

the power dissipation. The devices switch to a low-qui-

escent-current (IQ) LDO mode of operation at light load.

During the key-off condition, the system’s microcon-

troller drives the LDO/BUCK input on the fly and forces

the MAX5096/MAX5097 into LDO Mode, thereby reduc-

ing the quiescent current significantly.

In Buck Mode, the MAX5096/MAX5097 operate from a 5V

to 40V input voltage range and deliver up to 600mA of

load current with excellent load and line regulation. The

fixed-switching frequency versions of 135kHz and

330kHz are available. The MAX5096/MAX5097 DC-DC

internal oscillator can be synchronized to an external

clock. External compensation and a current-mode control

scheme make it easy to design with.

In LDO Mode, the MAX5096/MAX5097 operate from a

4V to 40V input voltage. The LDO Mode operation is

intended for a lower output load current of up to

100mA. The quiescent current at 100µA load in LDO

Mode is only 41µA (typ).

The MAX5096/MAX5097 feature an enable input that

shuts down the device, reducing the current consump-

tion to 6µA (typ). Additional features include a power-on

reset output with a capacitor-adjustable timeout period,

programmable soft-start, output tracking, output over-

load, short-circuit and thermal shutdown protections.

The MAX5096/MAX5097 operate over the -40°C to

+125°C automotive temperature range and are avail-

able in thermally enhanced 20-pin TSSOP or 16-pin

TQFN packages.

Applications

Automotive

Industrial

Features

♦High-Efficiency Switcher Mode (Buck Mode) or

Low-Quiescent-Current Linear Regulator

(LDO Mode) Operation

♦Wide Operating Input Voltage Range

+5V to +40V Buck Mode

+4V to +40V LDO Mode

♦Fixed 3.3V or 5V and Adjustable (1.24V to 11V)

Output Voltage Versions

♦6μA (typ) Shutdown Current

♦Fixed 135kHz or 330kHz Switching Frequency

♦External Frequency Synchronization

♦Programmable Soft-Start

♦Integrated Microprocessor Reset (RESET) Circuit

with Programmable Timeout Period

♦Thermal and Short-Circuit Protection

♦-40°C to +125°C Automotive Temperature Range

♦Thermally-Enhanced Package Dissipates

2.6W at TA= +70°C (16-Pin TQFN)

1.7W at TA= +70°C (20-Pin TSSOP)

MAX5096/MAX5097

40V, 600mA Buck Converters with Low-

Quiescent-Current Linear Regulator Mode

________________________________________________________________ Maxim Integrated Products 1

19-0603; Rev 2; 9/07

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

PKG

CODE

MAX5096AATE+

-40°C to +125°C 16 TQFN-EP*

T1655-2

MAX5096BATE+

-40°C to +125°C 16 TQFN-EP*

T1655-2

MAX5096AAUP+

-40°C to +125°C 20 TSSOP-EP*

U20E-4

MAX5096BAUP+

-40°C to +125°C 20 TSSOP-EP*

U20E-4

MAX5097AATE+

-40°C to +125°C 16 TQFN-EP*

T1655-2

MAX5097BATE+

-40°C to +125°C 16 TQFN-EP*

T1655-2

MAX5097AAUP+

-40°C to +125°C 20 TSSOP-EP*

U20E-4

MAX5097BAUP+

-40°C to +125°C 20 TSSOP-EP*

U20E-4

TQFN

15 14 13

5678

OUT

ADJ

LDO/BUCK

SGND

RESET

SYNC

COMP

PGND

MAX5096

MAX5097

TOP VIEW

N.C.

ENPGND

TOP VIEW

MAX5096

MAX5097

OUT

ADJ

N.C.BP

138N.C.

129 COMPSYNC

1110 CTSS

SGND

TSSOP

LDO/BUCK

RESET

Pin Configurations

+Denotes lead-free package.

*EP = Exposed pad.

Dual Mode is a trademark of Maxim Integrated Products, Inc.

MAX5096/MAX5097

40V, 600mA Buck Converters with Low-

Quiescent-Current Linear Regulator Mode

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

(All voltages referenced to PGND, unless otherwise noted.)

IN (transient, 1ms) ..................................................-0.3V to +45V

SGND ....................................................................-0.3V to +0.3V

LX....................................................................-1V to (VIN + 0.3V)

LX Current ................................................................................2A

EN ................................................................-0.3V to (VIN + 0.3V)

BP, SYNC, LDO/BUCK, RESET to SGND...............-0.3V to +12V

BP, RESET Output Current..................................................25mA

CT, SS, ADJ, COMP to SGND ....................-0.3V to (VBP + 0.3V)

OUT ........................................................................-0.3V to +11V

OUT Short-Circuit Duration ........................................Continuous

Continuous Power Dissipation (TA= +70°C)*

16-Pin TQFN (derate 33.3mW/°C above +70°C) ........2666mW

20-Pin TSSOP (derate 21.7mW/°C above +70°C) ......1739mW

Thermal Resistance:

(θJA, 16-Pin TQFN)* ...................................................30.0°C/W

(θJC, 16-Pin TQFN).......................................................1.7°C/W

(θJA, 20-Pin TSSOP)* .................................................46.0°C/W

(θJC, 20-Pin TSSOP)........................................................2°C/W

Operating Temperature Range .........................-40°C to +125°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-60°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

ELECTRICAL CHARACTERISTICS

(VIN = +14V, IOUT = 1mA, CIN = 100µF, COUT = 22µF, L = 22µH, CBP = 1µF, VEN = +2.4V (Figure 2), SGND = PGND = 0V, TA= TJ=

-40°C to +125°C, unless otherwise noted. Typical values are at TA= TJ= +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

SYSTEM INPUT

Input Voltage Range (LDO Mode)

VIN_LDO

LDO/BUCK = high 4 40 V

Input Voltage Range (Buck

Mode)

VIN_BUCK

LDO/BUCK = low 5 40 V

Internal Input Undervoltage

Lockout VUVLO VBP rising 3.5

3.65

3.9 V

Internal Input Undervoltage

Lockout Hysteresis

VUVLO_HYS

VBP falling 0.2 V

BP (Internal Regulator) Output

Voltage VBP VIN = +4.5V, IBP = 100µA

3.75

4.20

LDO/BUCK = high,

measured at input supply

return, VOUT = 5V,

IOUT = 100µA

TA = -40°C to

+125°C 38 70

Quiescent Supply Current

(LDO Mode)

LDO/BUCK = high,

measured at input supply

return, VOUT = 5V,

IOUT = 100mA

TA = -40°C to

+125°C 44 100

µA

Buck Converter No-Load Supply

Current

IQ_BUCK

VIN = 14V, VOUT = 5V, IOUT = 0

680

µA

TA = -40°C to

+125°C 619

Shutdown Supply Current ISHDN VEN = 0V, measured

from VIN TA = -40°C to

+85°C 612

µA

*As per JEDEC 51 Standard—Multilayer Board.

MAX5096/MAX5097

40V, 600mA Buck Converters with Low-

Quiescent-Current Linear Regulator Mode

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VIN = +14V, IOUT = 1mA, CIN = 100µF, COUT = 22µF, L = 22µH, CBP = 1µF, VEN = +2.4V (Figure 2), SGND = PGND = 0V, TA= TJ=

-40°C to +125°C, unless otherwise noted. Typical values are at TA= TJ= +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX

UNITS

BUCK MODE

Supply Current

(Buck Converter On) IS

LDO/BUCK = low,

VADJ = 1.4V, MAX5096,

no switching

135kHz

version

693

980 µA

Supply Current

(Buck Converter On) IS

LDO/BUCK = low,

VADJ = 1.4V, MAX5097,

no switching

330kHz

Version

720 1000

µA

5V version, 5.5V ≤ VIN ≤ 40V, no load

4.85

5.12

Fixed Output Voltage VOUT 3.3V version, 5.5V ≤ VIN ≤ 40V, no load

3.196

3.3

3.391

ADJ Set Point VFB 50% duty cycle, no load

1.21 1.235 1.27

ADJ Input Bias Current IFB VADJ = 1.5V 5 100 nA

VADJTH_R

ADJ rising

125

Dual Mode ADJ Threshold

VADJTH_F

ADJ falling 62 mV

Maximum Duty Cycle DMAX VADJ = 0.5V

100

Error Amplifier Transconductance

GmEA VCOMP = VADJ, ICOMP = ±10µA 55

136

210 µS

Adjustable Output Voltage Range

VADJ

1.235 11.000

Minimum Output Current IOUT VIN = 6.5V to 40V

600

Switch Current Limit

ISW_LIM

VIN = 6V to 40V

1.15

1.5

1.90

Internal Switch On-Resistance

RDS

(

)

VIN = 14V, IDRAIN = 100mA 0.9 2.1 Ω

Switch Leakage Current ISW_L VEN = 0V

0.05

3µA

VIN = 14V, VOUT = 5V, IOUT = 400mA 85

Efficiency ηVIN = 14V, VOUT = 3.3V, IOUT = 400mA 81 %

MAX5096

120 135

148 kHz

Switching Frequency fSW MAX5097

300 330

350 kHz

MAX5096

120

500 kHz

Synchronization SYNC Input fSYNC MAX5097

300

500 kHz

SYNC Input High Threshold

VSYNCH

VBP = 4V 2.0 V

SYNC Input Low Threshold

VSYNCL

VBP = 4V 0.8 V

SYNC Input Minimum High Pulse

Width

250

SYNC Input Leakage VSYNC =11V 1 µA

LDO MODE

Guaranteed Output Current IOUT (Note 2)

100

MAX5096/MAX5097

40V, 600mA Buck Converters with Low-

Quiescent-Current Linear Regulator Mode

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VIN = +14V, IOUT = 1mA, CIN = 100µF, COUT = 22µF, L = 22µH, CBP = 1µF, VEN = +2.4V (Figure 2), SGND = PGND = 0V, TA= TJ=

-40°C to +125°C, unless otherwise noted. Typical values are at TA= TJ= +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX

UNITS

5V version, MAX5096B/MAX5097B,

5.5V ≤ VIN ≤ 40V, IOUT = 10mA

4.89

5.09

Output Voltage VOUT 3.3V version, MAX5096A/MAX5097A,

4V ≤ VIN ≤ 40V, IOUT = 10mA

3.219

3.3

3.378

ADJ Set Point VADJ IOUT = 10mA

1.21 1.2375 1.26

ADJ Input Bias Current IFB VADJ = 4V 0.5

100

Adjustable Output Voltage Range

VADJ IOUT = 10mA

1.237 11.000

Dropout Voltage ΔVDO

IOUT = 100mA,

VOUT = 0.98 x VOUT(NOMINAL) (5V version

only), MAX5096B/MAX5097B

0.37

Startup Response Time

Rising edge of EN to

VOUT = 10% VOUT(NOMINAL),

RL = 500Ω, VADJ = SGND,

LDO/BUCK = 4V, CSS = 2nF

300 µs

5V version,

+5.5V ≤ VIN ≤ +40V, IOUT = 100mA

0.125

Line Regulation ΔVOUT /

ΔVIN 3.3V version,

+4V ≤ VIN ≤ +40V, IOUT = 100mA

0.093

mV/V

TJ = +25°C

0.242 0.374

5V version,

IOUT = 100µA to

100mA, VIN = +14V TJ = -40°C to +125°C 0.242

TJ = +25°C

0.164 0.237

Load Regulation ΔVOUT /

ΔIOUT 3.3V version,

IOUT = 100µA to

100mA, VIN = +14V TJ = -40°C to +125°C 0.164

mV/mA

Power-Supply Rejection Ratio PSRR IOUT = 10mA, f = 100Hz, 500mVP-P,

VOUT = +5V, VIN = +14V 60 dB

Short-Circuit Current ISC VIN = 6V 150 330

500

BUCK MODE (LDO MODE TRANSITION)

LDO/BUCK High Threshold 2.0 V

LDO/BUCK Low Threshold 0.8 V

LDO/BUCK Input Leakage LDO/BUCK = 11V 1 µA

Transition Timing from LDO Mode

to Buck Mode

Falling edge of LDO/BUCK to buck

converter on 32

Clock

Periods

Transition Timing from Buck

Mode to LDO Mode

Rising edge of LDO/BUCK to LDO

operation 100 µs

SOFT-START, ENABLE (EN) AND RESET

Soft-Start Charge Current ISS VSS = 0.1V 3 5 7 µA

Soft-Start Reference Voltage

VSS-REF

VOUT = VOUT(NOMINAL) - 20% 0.9

0.99

1.1 V

EN High-Voltage Threshold VENH EN = high, regulator on 1.4 V

MAX5096/MAX5097

40V, 600mA Buck Converters with Low-

Quiescent-Current Linear Regulator Mode

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (continued)

(VIN = +14V, IOUT = 1mA, CIN = 100µF, COUT = 22µF, L = 22µH, CBP = 1µF, VEN = +2.4V (Figure 2), SGND = PGND = 0V, TA= TJ=

-40°C to +125°C, unless otherwise noted. Typical values are at TA= TJ= +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX

UNITS

EN Low-Voltage Threshold VENL Regulator off 0.4 V

EN Input Pulldown VEN = 2V, LDO/BUCK = 4V 0.5 µA

RESET Voltage Threshold High

VRESET_H

VOUT rising 89 92 94

% VOUT

RESET Voltage Threshold Low

VRESET_L

VOUT falling 87 90 92

% VOUT

RESET Output-Low Voltage VRL ISINK = 1mA 0.2 V

RESET Output-High Leakage

Current IRH VRESET = 5V, VADJ = 1.5V 1 µA

RESET Output Minimum Timeout

Period CCT = 0 25 µs

VOUT to RESET Delay VOUT falling 10mV/µs, CCT = 0 6 µs

Delay Comparator Threshold VCT_TH VCT rising

1.18 1.2374 1.29

Delay Comparator Threshold

Hysteresis

100

CT Charge Current ICH

0.74

1.20

µA

CT Discharge Current IDISCH VCT = 1V

13.8

THERMAL SHUTDOWN

Thermal Shutdown Temperature

(

SHDN

)

Temperature rising

+165

°C

Thermal Shutdown Hysteresis

ΔTJ

(

SHDN

)

20 °C

Note 1: Limits to -40°C are guaranteed by design.

Note 2: The continuous maximum output current from LDO is limited by package power dissipation.

MAX5096/MAX5097

40V, 600mA Buck Converters with Low-

Quiescent-Current Linear Regulator Mode

6 _______________________________________________________________________________________

Typical Operating Characteristics

(VIN = +14V, VEN = +2.4V, MAX5097AATE+, Figures 2 and 4, TA= +25°C, unless otherwise specified.)

OUTPUT VOLTAGE vs. INPUT VOLTAGE

(LDO MODE)

MAX5096 toc01

INPUT VOLTAGE (V)

OUTPUT VOLTAGE (V)

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

1 100

IOUT = 50mA

OUTPUT VOLTAGE vs. INPUT VOLTAGE

(BUCK MODE)

MAX5096 toc02

INPUT VOLTAGE (V)

OUTPUT VOLTAGE (V)

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

1100

IOUT = 600mA

-40 -10 5 20-25 35 50 9580 11065 125

QUIESCENT SUPPLY CURRENT

vs. TEMPERATURE (LDO MODE)

MAX5096 toc03

TEMPERATURE (°C)

QUIESCENT SUPPLY CURRENT (μA)

VIN = 14V

VOUT = 3.3V

IOUT = 100mA

IOUT = 100μA

IOUT = 0

640

660

650

680

670

700

690

710

NO-LOAD SUPPLY CURRENT

vs. TEMPERATURE (BUCK MODE)

MAX5096 toc04

VIN = 14V

VOUT = 3.3V

-40 -10 5 20-25 35 50 9580 11065 125

TEMPERATURE (°C)

NO-LOAD SUPPLY CURRENT (μA)

SHUTDOWN CURRENT

vs. TEMPERATURE

MAX5096 toc05

-40 -10 5 20-25 35 50 9580 11065 125

TEMPERATURE (°C)

SHUTDOWN CURRENT (μA)

VEN = 0V

VIN = 14V

3.0

3.1

3.2

3.3

3.4

3.5

OUTPUT VOLTAGE vs. TEMPERATURE

(LDO MODE)

MAX5096 toc06

OUTPUT VOLTAGE (V)

-40 -10 5 20-25 35 50 9580 11065 125

TEMPERATURE (°C)

VOUT = 3.3V

IOUT = 10mA IOUT = 100μA

IOUT = 10mA

3.24

3.28

3.26

3.32

3.30

3.36

3.34

3.38

OUTPUT VOLTAGE

vs. TEMPERATURE (BUCK MODE)

MAX5096 toc07

-40 -10 5 20-25 35 50 9580 11065 125

TEMPERATURE (°C)

OUTPUT VOLTAGE (V)

VOUT = 3.3V

IOUT = 100μA

IOUT = 100mA IOUT = 600mA

0.04

0.02

0.10

0.08

0.06

0.16

0.14

0.12

0.18

04020 60 80 100

DROPOUT VOLTAGE

vs. OUTPUT CURRENT (LDO MODE)

MAX5096 toc08

OUTPUT CURRENT (mA)

DROPOUT VOLTAGE (V)

VOUT = 5V

100

0.01 0.1 1

EFFICIENCY vs. LOAD CURRENT

(VOUT = 3.3V)

MAX5096 toc09

LOAD CURRENT (A)

EFFICIENCY (%)

VIN = 5V

VIN = 14V

VIN = 24V

VIN = 40V

fSW = 330kHz

MAX5096/MAX5097

40V, 600mA Buck Converters with Low-

Quiescent-Current Linear Regulator Mode

_______________________________________________________________________________________ 7

Typical Operating Characteristics (continued)

(VIN = +14V, VEN = +2.4V, MAX5097AATE+, Figures 2 and 4, TA= +25°C, unless otherwise specified.)

100

0.01 0.1 1

EFFICIENCY vs. LOAD CURRENT

(VOUT = 5V)

MAX5096 toc10

LOAD CURRENT (A)

EFFICIENCY (%)

VIN = 40V

VIN = 5.5V VIN = 24V

VIN = 14V

2ms/div

LOAD-TRANSIENT RESPONSE

(LDO MODE)

IOUT

50mA/div

VOUT

50mV/div

MAX5096 toc11

VIN = 14V

IOUT = 100μA to 50mA

1ms/div

LOAD-TRANSIENT RESPONSE

(BUCK MODE)

IOUT

200mA/div

VOUT

AC-COUPLED

100mV/div

MAX5096 toc12

VIN = 14V

ISTEP = 300mA to 600mA

10ms/div

VIN STARTUP RESPONSE

(LDO MODE)

VIN

10V/div

RESET

5V/div

MAX5096 toc13

VIN = 14V

IOUT = 0A

CCT = 0.047μF

VEN

10V/div

VOUT

2V/div

10ms/div

ENABLE STARTUP RESPONSE

(LDO MODE)

VIN

10V/div

RESET

5V/div

MAX5096 toc14

VIN = 14V

IOUT = 100mA

CCT = 0.047μF

VEN

5V/div

VOUT

2V/div

10ms/div

VIN STARTUP RESPONSE

(BUCK MODE)

VIN

10V/div

RESET

5V/div

MAX5096 toc15

VIN = 14V

IOUT = 0A

CCT = 0.047μF

VEN

5V/div

VOUT

2V/div

10ms/div

ENABLE STARTUP RESPONSE

(BUCK MODE)

VIN

10V/div

RESET

5V/div

MAX5096 toc16

VIN = 14V

IOUT = 600mA

CCT = 0.047μF

VEN

5V/div

VOUT

2V/div

100ms/div

SHUTDOWN RESPONSE THROUGH

VIN (LDO MODE)

VIN

10V/div

RESET

5V/div

MAX5096 toc17

IOUT = 50mA

VEN

10V/div

VOUT

2V/div

100ms/div

SHUTDOWN RESPONSE THROUGH

VIN (BUCK MODE)

VIN

10V/div

RESET

5V/div

MAX5096 toc18

IOUT = 50mA

VEN

10V/div

VOUT

2V/div

MAX5096/MAX5097

40V, 600mA Buck Converters with Low-

Quiescent-Current Linear Regulator Mode

8 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VIN = +14V, VEN = +2.4V, MAX5097AATE+, Figures 2 and 4, TA= +25°C, unless otherwise specified.)

2μs/div

LX VOLTAGE AND INDUCTOR CURRENT

MAX5096 toc19

IOUT = 0A

VLX

5V/div

INDUCTOR

CURRENT

200mA/div

1μs/div

LX VOLTAGE AND INDUCTOR CURRENT

MAX5096 toc20

IOUT = 600mA

VLX

10V/div

INDUCTOR

CURRENT

500mA/div

1μs/div

LX VOLTAGE, SYNC INPUT,

AND INDUCTOR CURRENT

MAX5096 toc21

VLX

10V/div

INDUCTOR

CURRENT

500mA/div

SYNC INPUT

5V/div

400μs/div

TRANSITION FROM BUCK

MODE TO LDO MODE

MAX5096 toc22

LDO/BUCK

5V/div

IOUT

100mA/div

VOUT

AC-COUPLED

200mV/div

VIN = 14V

IOUT = 100mA

100μs/div

TRANSITION FROM LDO MODE

TO BUCK MODE

MAX5096 toc23

LDO/BUCK

3V/div

IOUT

100mA/div

VOUT

AC-COUPLED

200mV/div

VIN = 14V

IOUT = 100mA

MAX5096/MAX5097

40V, 600mA Buck Converters with Low-

Quiescent-Current Linear Regulator Mode

_______________________________________________________________________________________ 9

Pin Description

TQFN TSSOP NAME FUNCTION

1 4 PGND

Power Ground. Return path for p-channel power MOSFET driver. Connect the input

capacitor return, freewheeling diode anode, and output capacitor return terminals to

PGND.

2 5 SGND

Signal Ground. Connect SGND to PGND near the input bypass capacitor return terminal.

36RESET

Open-Drain, Active-Low Reset Output. RESET asserts low when OUT drops below the

reset threshold. When output rises above 92% of the programmed level, RESET

becomes high impedance after the reset timeout period. Connect a pullup resistor from

RESET to the converter output to create a logic output.

47BP

4V Internal Regulator Output. Bypass BP to SGND with a 1µF or greater ceramic

capacitor.

5 9 SYNC Synchronization Input. Connect SYNC to an external clock for synchronization. Connect

SYNC to SGND when not used.

610SS

Soft-Start Timer Input. Connect an external capacitor from SS to SGND to adjust the soft-

start timeout period (see the Soft-Start (SS) section).

711CT

Reset Timeout Period. Connect a capacitor from CT to SGND to set the reset timeout

period (see the Power-On Reset Output

RESET

section).

8 12 COMP

Buck Converter (Buck Mode) Control Loop Compensation. See the Compensation

Network section for compensation network design. LDO mode does not need external

compensation.

913

LDO/BUCK

LDO Mode/Buck Mode Select. Drive LDO/BUCK low to select the Buck Mode. The Buck

Mode activates after 32 internal/external clock cycles. Force the LDO/BUCK high (> 2V),

to select LDO Mode. The Buck Mode stops and LDO Mode is activated with a 100µs

delay.

10 15 ADJ

Regulator Output Feedback Point. Connect ADJ to SGND for a fixed 3.3V

(MAX5096A/MAX5097A) or 5V (MAX5096B/MAX5097B). For adjustable output voltage,

use an external resistive divider to set VOUT. VADJ regulating set point is 1.237V.

11 16 OUT

Converter Output. OUT must always be connected to the regulator output. Connect at

least a 22µF low-ESR (equivalent series resistance) capacitor from OUT to PGND for

stable operation.

12 17 EN Enable Input. EN is internally pulled to ground. Drive EN high to turn on the regulator.

Force EN low or leave unconnected to place the device in shutdown mode.

13, 14 19, 20 LX Drain Connection of Internal p-Channel High-Side Switch

15, 16 1, 2, 3 IN Regulator Input. Bypass IN to PGND with a parallel combination of low-ESR ceramic and

aluminum capacitor to handle the input ripple current.

— 8, 14, 18 N. C. No Connection. Not internally connected.

EP EP EP Exposed Pad. Connect externally to a large ground plane (SGND) for improved heat

dissipation. Do not use EP as an electrical ground connection.

MAX5096/MAX5097

40V, 600mA Buck Converters with Low-

Quiescent-Current Linear Regulator Mode

10 ______________________________________________________________________________________

VREF

0.9Ω

CURRENT

LIMITER

RESET

INTERNAL

4V LDO

ADJ

RESET

GATE

DRIVER

MUX

PGND

LDO/BUCK

LVOUT

CIN

PWM

COUT

SYNC

0.12V

FEEDBACK

SELECTOR

BUCK MODE GM

AMPLIFIER

LDO/ BUCK

SELECTOR

PWM

COMPARATOR

DC-DC ENABLE

OSCILLATOR

AND RAMP

GENERATOR

MODE

SELECTOR

OUT

LDO MODE

AMPLIFIER

CURRENT

SENSE

COMP

VOUT

SGND

VIN

SYNCRO

CBP

RPU

CSS

CCT

BIAS SOFT-

START

INTERNAL

BANDGAP

UVLO

THERMAL

PROTECTION

VREF

MAX5096

MAX5097

Figure 1. Simplified Diagram

Detailed Description

The MAX5096/MAX5097 are easy-to-use, high-efficien-

cy, PWM current-mode, step-down switching convert-

ers in normal operation. The MAX5096/MAX5097 have

an internal high-side p-channel 0.9Ωswitch and use a

low forward-drop freewheeling diode for rectification. In

Buck Mode, the p-channel switches at the 135kHz or

330kHz frequency. Buck Mode uses a current-mode

control architecture that offers excellent line-transient

response, easier frequency compensation, and cycle-

by-cycle current limiting. The buck converter is com-

pensated externally for a selected value/type of output

inductor and capacitor.

The internal p-channel switch acts as a pass element

when operating in the low-quiescent-current LDO

Mode.

The LDO Mode can be selected on the fly through the

LDO/BUCK input. During the key-off condition, the sys-

tem’s microcontroller drives the LDO/BUCK input high

and forces the MAX5096/MAX5097 into LDO Mode,

reducing the quiescent current to 1µA (typ). When in

LDO Mode, the device is capable of delivering up to

100mA, which may be limited by the device power dis-

sipation. The LDO and switcher share the same pass

element and the reference; however, the error ampli-

fiers are different with their own compensation

schemes.

The MAX5096/MAX5097 include an integrated micro-

processor reset circuit with an adjustable reset timeout

period. The internal reset circuit monitors the regulator

output voltage and asserts RESET low when the regula-

tor output falls below the reset threshold voltage. Other

features include an enable input, externally program-

mable soft-start, optimized current-limit protection in

both LDO and Buck Modes, and thermal shutdown.

Enable Input (EN)

EN is a logic-level enable input that turns the device on

or off. The logic-high and logic-low voltages for the EN

input are 1.4V and 0.4V, respectively. Drive EN high to

turn on the device, and drive it low to place the device

in shutdown. Leaving EN unconnected disables the

device since the EN is internally pulled low with a 0.5µA

current, however, a forced pulldown of EN improves the

noise immunity. The MAX5096/MAX5097 draw 6µA

(typ) of supply current when in shutdown. EN with-

stands up to +40V, allowing EN to be connected direct-

ly to IN for always-on operation. The converter may be

turned on and off while in both Buck and LDO Modes.

Each time the EN is toggled, the output rises with a pro-

grammed soft-start period.

Internal Regulator (BP)/

Undervoltage Lockout

The MAX5096/MAX5097 include an internal 4V auxiliary

regulator to power internal circuitry. Bypass the auxil-

iary regulator output (BP) to SGND with a 1µF ceramic

capacitor physically located close to the device. The

regulator is not intended to supply the external circuit

other than pulling up the LDO/BUCK input or RESET.

Do not load BP externally by more than 2mA. The regu-

lator output is regulated to 4V with 7% accuracy during

steady state. During turn-on, the BP voltage stabilizes

after 250µs with a 1µF capacitor at BP. Drive EN high to

turn on the internal regulator. The internal UVLO with

hysteresis ensures stable operation, resulting in the

monotonic rise of the output voltage. The UVLO circuit

monitors the output of the regulator. The rising UVLO

threshold is internally set to 3.65V (BP rising) with a

185mV hysteresis (BP falling). The 3.65V UVLO at the

no-load BP output guarantees operation at VIN lower

than 4V.

Soft-Start (SS)

Soft-start provides for the monotonic, glitch-free turn-on

of the converter. Soft-start limits the input inrush current

which may cause a glitch, especially if the source

impedance is high. The soft-start period required also

depends on the output capacitance and the closed-

loop bandwidth of converter. The soft-start period for

the MAX5096/MAX5097 is externally programmable

using a single capacitor (CSS). The soft-start is

achieved by the controlled ramping up of the error

amplifier reference input. At startup, after VIN is applied

and the UVLO threshold is reached, the device enters

soft-start. During soft-start, 5µA is sourced into the

capacitor (CSS) connected from SS to SGND (Figure 2)

causing the reference voltage to ramp up slowly. When

VSS reaches 1.237V, the output becomes fully active.

Set the soft-start time (tSS) using following equation:

where VSS is 1.237V, ISS is 5µA, tSS is in seconds, and

CSS is in Farads.

Pulling EN low quickly discharges the CSS capacitor,

making it ready for the next soft-start period.

SS SS

=×

MAX5096/MAX5097

40V, 600mA Buck Converters with Low-

Quiescent-Current Linear Regulator Mode

______________________________________________________________________________________ 11

MAX5096/MAX5097

Output Voltage Tracking/Sequencing

The output voltages of multiple MAX5096/MAX5097

converters can be made to track by using the SS pin

during turn-on and turn-off (see Figure 3). SS is pulled

up using a 5µA current source and connecting SS of

multiple MAX5096/MAX5097s, raising the references

with the same slope. Tracking the converters reduces

the differential voltages between the core and I/O volt-

ages during turn-on, turn-off, and brownout. If any one

converter output drops due to shutdown or an overload

fault situation, the SS drops, pulling down all the con-

verters simultaneously. The rate of fall of output volt-

ages, however, depends on the output capacitance

and load of the individual converter.

Multiple voltage sequencing can be done by daisy-

chaining several MAX5096/MAX5097s. The RESET of

the first converter can be connected to EN of the sec-

ond converter. This allows the first converter to come

up first every time the system is powered up.

Power-On Reset Output (

RESET

)

A supervisor circuit is integrated in the MAX5096/

MAX5097. RESET is an open-drain output. RESET pulls

low as soon as VOUT drops below 90% of its nominal

regulation voltage. Once the output voltage rises above

92% of the set output voltage, the RESET output enters

a high-impedance state after the active timeout period

(tRP). The active timeout period is externally program-

mable using a single capacitor from CT to ground. Use

the following equation to calculate the required timeout

period for the power-on reset:

where VCT-TH is 1.237V, ICH is 1µA, tRP is in seconds,

and CCT is in Farads.

To obtain a logic-voltage output, connect a pullup

resistor from RESET to a logic-supply voltage. The

internal open-drain MOSFET can sink 1mA while provid-

ing a TTL logic-low signal. If unused, ground RESET or

leave it unconnected.

The power-on reset behavior is the same in both the

LDO and Buck Modes of operation.

Oscillator/Synchronization Input (SYNC)

The MAX5096/MAX5097 internal oscillator generates a

factory-preset frequency of either 135kHz (MAX5096)

or 330kHz (MAX5097). The 135kHz version keeps the

maximum fundamental frequency below 150kHz, which

keeps the third harmonic below 450kHz and under the

RP CT TH

CH CT

=×

−

40V, 600mA Buck Converters with Low-

Quiescent-Current Linear Regulator Mode

12 ______________________________________________________________________________________

PGND

OUT

VIN

GND

VIN

VOUT

ADJ

22μH

COUT

22μF

(CER.)

COMP

SYNC D1*

B260/

MURS105

CIN

100μF

LDO/BUCK

RESET

22pF

CSS

0.047μFCCT

0.01μF

100kΩ

1.0μF

MAX5096

MAX5097

100kΩ

1.2nF

*USE MURS105 IN APPLICATIONS

WHERE LDO MODE QUIESCENT

CURRENT IS CRITICAL.

RESET

Figure 2. Fixed Output Voltage Configuration

lower end of the AM band. The MAX5096 is suitable for

noise-sensitive applications like AM radio power sup-

ply. For an application where size is more important,

use the MAX5097, which runs at 330kHz frequency.

The high-frequency operation reduces the size and

cost of the external inductor and capacitor. The

MAX5096/MAX5097 can be synchronized using an

external signal. The MAX5096 can be synchronized

from 120kHz to 500kHz, while the MAX5097 is capable

of synchronizing from 300kHz to 500kHz. The external

synchronization feature makes frequency hopping pos-

sible depending on the selected AM channel. Connect

SYNC to ground, if not used.

Thermal Protection

When the junction temperature exceeds TJ= +165°C,

an internal thermal sensor signals the shutdown logic,

which turns off the regulator (both in Buck Mode and

LDO Mode), and discharges the soft-start capacitor

allowing the IC to cool. The thermal sensor turns the

regulator on again after the IC’s junction temperature

cools by 20°C, resulting in a cycled output during con-

tinuous thermal-overload conditions. The thermal hys-

teresis and a soft-start period limit the average power

dissipation into the device during continuous fault con-

dition. During operation, do not exceed the absolute

maximum junction temperature rating of TJ= +150°C.

Applications Information

Output Voltage Selection

The MAX5096/MAX5097 can be configured as either a

preset fixed output voltage or an adjustable output volt-

age device. Connect ADJ to ground to select the facto-

ry-preset output voltage option (Figure 2). The

MAX5096A/MAX5097A and MAX5096B/MAX5097B

provide a fixed output voltage equal to 3.3V and 5V,

respectively (see the Selector Guide). The MAX5096/

MAX5097 become an adjustable version as soon as the

devices detect about 125mV at the ADJ pin. The resis-

tor-divider at ADJ increases the ADJ voltage above

125mV and also adjusts the output voltage depending

upon the resistor values. In adjustable mode, select an

output between +1.273V and +11V using two external

resistors connected as a voltage-divider to ADJ (Figure

4). Set the output voltage using the following equation:

where VADJ = 1.273V and R2 is chosen to be approxi-

mately 100kΩ.

Connect ADJ to GND if adjustable mode is not used.

Inductor Selection

Three key inductor parameters must be specified for

proper operation with the MAX5096/MAX5097: induc-

tance value (L), peak inductor current (IPEAK), and

inductor saturation current (ISAT). The minimum

required inductance is a function of operating frequen-

cy, input-to-output voltage differential, and the peak-to-

peak inductor current (ΔIP-P). Higher ΔIP-P allows for a

lower inductor value, while a lower ΔIP-P requires a

higher inductor value. A lower inductor value minimizes

size and cost and improves large-signal and transient

response, but reduces efficiency due to higher peak

currents and higher peak-to-peak output voltage ripple

for the same output capacitor. On the other hand, high-

er inductance increases efficiency by reducing the rip-

ple current. Resistive losses due to extra wire turns can

exceed the benefit gained from lower ripple current lev-

els, especially when the inductance is increased while

keeping the dimension of the inductor constant. A good

compromise is to choose ΔIP-P equal to 40% of the full

load current. Calculate the inductor value using the fol-

lowing equation:

LVVV

Vf I

OUT IN OUT

IN SW P P

=−

××

−

()

VV R

OUT ADJ

=×+

⎛

⎝

⎜⎞

⎠

⎟

MAX5096/MAX5097

40V, 600mA Buck Converters with Low-

Quiescent-Current Linear Regulator Mode

______________________________________________________________________________________ 13

VOUT3

VOUT2

VOUT1

SOFT-START STOP

RATIOMETRIC TRACKING OUTPUTS

SEQUENCED OUTPUTS

STOP

SOFT-START

VOUT3

VOUT2

VOUT1

Figure 3. Output Voltage Tracking/Sequencing

MAX5096/MAX5097

use typical values of VIN and fSW so that efficiency is opti-

mum for typical conditions. The switching frequency (fSW)

is fixed at 135kHz (MAX5096) and 330kHz (MAX5097).

fSW can also be varied from 120kHz to 500kHz

(MAX5096) and from 300kHz to 500kHz (MAX5097) when

synchronized to an external clock (see the Oscillator/

Synchronization Input (SYNC) section). The peak-to-peak

inductor current, which reflects the peak-to-peak output

ripple, is worst at the maximum input voltage. See the

Output Capacitor Selection section to verify that the

worst-case output ripple is acceptable. The inductor satu-

rating current (ISAT) is also important to avoid runaway

current during continuous output short circuit. Select an

inductor with an ISAT specification higher than the maxi-

mum peak current limit of 1.9A.

The Buck Mode operation determines the inductor and

output capacitor values. However, the values of the

inductor, its DCR, and the output capacitance/ESR

affect the closed-loop transfer function both in Buck

and LDO Modes. The internal compensation of the

MAX5096/MAX5097 in LDO Mode limits the values of

these external components. Make sure that the combi-

nation of output inductor, capacitor, and ESR falls with-

in the range specified in following Table 1.

Output Capacitor Selection

The allowable output voltage ripple and the maximum

deviation of the output voltage during load steps deter-

mine the output capacitance and its ESR. The output

40V, 600mA Buck Converters with Low-

Quiescent-Current Linear Regulator Mode

14 ______________________________________________________________________________________

PGND

OUT

VIN

GND

5V TO 40V

VIN

VOUT

ADJ

22μH

COUT

22μF

COMP

SYNC

D1*

B260/

MURS105

CIN

100μF

LDO/BUCK

RESET

RPU

1.0μF

MAX5096

MAX5097

CCT

CSS

RESET

*USE MURS105 IN APPLICATIONS

WHERE LDO MODE QUIESCENT

CURRENT IS CRITICAL.

Figure 4. Adjustable Output Voltage Configuration

INDUCTOR

OUTPUT CAPACITOR (COUT)

22µF, ESR = 5mΩ to 20mΩ (ceramic)

47µF, ESR = 40mΩ to 150mΩ

100µF, ESR = 30mΩ to 100mΩ

22µH

470µF / ESR = 60Ω to 400mΩ

22µF, ESR = 5mΩ to 20mΩ (ceramic)

47µF / ESR = 40mΩ to 150mΩ

100µF / ESR = 30mΩ to 100mΩ

47µH

470µF / ESR = 60mΩ to 400mΩ

22µF, ESR = 5mΩ to 20mΩ (ceramic)

47µF / ESR = 40mΩ to 150mΩ

100µF / ESR = 30mΩ to 100mΩ

100µH

470µF / ESR = 60mΩ to 400mΩ

Table 1. Inductor/Output Capacitor

Selection

ripple is mainly composed of ΔVQ(caused by the

capacitor discharge) and ΔVESR (caused by the volt-

age drop across the ESR of the output capacitor).

Normally, a good approximation of the output voltage

ripple is ΔVRIPPLE ≈ΔVESR + ΔVQ. If using ceramic

capacitors, assume the contribution to the output volt-

age ripple from the ESR and the capacitor discharge to

be equal to 20% and 80%, respectively. If using alu-

minum electrolyte capacitors, assume the contribution

to the output voltage ripple from the ESR and the

capacitor discharge to be equal to 90% and 10%,

respectively.

Use the following equations for calculating the output

capacitance and its ESR for required peak-to-peak out-

put voltage ripple.

ΔIP-P is the peak-to-peak inductor current and fSW is

the converter’s switching frequency.

The allowable deviation of the output voltage during

fast load transients also determines the output capaci-

tance, its ESR, and its equivalent series inductance

(ESL). The output capacitor supplies the load current

during a load step until the controller responds with a

greater duty cycle. The response time (tRESPONSE)

depends on the closed-loop bandwidth of the converter

(see the Compensation Network section). The resistive

drop across the output capacitor’s ESR, the drop

across the capacitor’s ESL, and the capacitor dis-

charge, causes a voltage drop during the load step.

Use a combination of low-ESR tantalum/aluminum elec-

trolytic and ceramic capacitors for better transient load

and voltage ripple performance. Non-leaded capaci-

tors and/or multiple parallel capacitors help reduce the

ESL. Keep the maximum output voltage deviation

below the tolerable limits of the electronics being pow-

ered. Use the following equations to calculate the

required ESR, ESL, and capacitance value during a

load step:

where ISTEP is the load step, tSTEP is the rise time of the

load step, and tRESPONSE is the response time of the

controller. The response time of the converter is

approximately one third of the inverse of its closed-loop

bandwidth and also depends on the phase margin.

Rectifier Selection

The MAX5096/MAX5097 require an external Schottky/

fast-recovery diode rectifier as a freewheeling diode.

Connect this rectifier close to the device using short

leads and short PC board traces. Choose a rectifier

with a continuous current rating greater than the high-

est output current-limit threshold (1.9A) and with a volt-

age rating greater than the maximum expected input

voltage, VIN. Use a low forward-voltage-drop Schottky

rectifier to limit the negative voltage at LX. Avoid higher

than necessary reverse-voltage Schottky rectifiers that

have higher forward-voltage drops. Use a 60V (max)

Schottky rectifier with a 2A current rating. The Schottky

rectifier leakage current at high temperature significant-

ly increases the quiescent current in LDO Mode. In

applications where LDO Mode quiescent current is

important, use an ultra-fast switching diode to limit the

leakage current. In this type of application, use

MURS105, MURS120 for their fast-switching and low-

leakage features.

Input Capacitor Selection

The discontinuous input current of the buck converter

causes large input ripple currents and therefore, the

input capacitor must be carefully chosen to keep the

input voltage ripple within design requirements. The

input voltage ripple is comprised of ΔVQ(caused by

the capacitor discharge) and ΔVESR (caused by the

ESR of the input capacitor). The total voltage ripple is

the sum of ΔVQand ΔVESR. Calculate the input capaci-

tance and ESR required for a specified ripple using the

following equations (continuous mode):

IOUT_MAX is the maximum output current and D is the

duty cycle.

ESR V

CIDD

where

IVV V

Vf L and

ESR

OUT MAX PP

IN OUT MAX

QSW

PP IN OUT OUT

IN SW

OUT

⎛

⎝

⎜⎞

⎠

⎟

=×−

=−×

××

−

_()

()

ESR V

CIt

ESL Vt

ESR

STEP

OUT STEP RESPONSE

ESL STEP

STEP

=×

ESR V

OUT PP

QSW

ESR

=××

−

MAX5096/MAX5097

40V, 600mA Buck Converters with Low-

Quiescent-Current Linear Regulator Mode

______________________________________________________________________________________ 15

MAX5096/MAX5097

Compensation Network

The MAX5096/MAX5097 in LDO Mode are compensat-

ed internally with a compensation network around the

LDO error amplifier. When in Buck Mode, the DC-DC

gMamplifier must be externally compensated using a

network connected from COMP to ground. The current-

mode control architecture reduces the compensation

network to a single pole-zero. The RC and C network,

connected from the internal transconductance amplifier

output to SGND, can provide a single pole-zero pair.

Choose all the power components like the inductor,

output capacitor, and ESR first and design the com-

pensation network around them. Choose the closed-

loop bandwidth (fC) to be approximately 1/10 of the

switching frequency. See the following equations to cal-

culate the compensation values for the low-ESR output

capacitor with ESR zero frequency, approximately a

decade higher than fC.

Calculate the dominant pole due to the output capaci-

tor (COUT) and the load (ROUT):

where ROUT = VOUT / ILOAD.

Calculate the RCusing following equation:

where gMC is the control to output gain of the

MAX5096/MAX5097 buck converter and is equal to

1.06. VADJ is the feedback set point equal to 1.237V

and gm(transconductance amplifier gain) is equal to

136µS. See Figure 2.

Place a zero (fZ) at 0.9 x fPO:

Finally, place a high-frequency pole at the frequency

equal to half of the converter switching frequency (fSW).

Place the compensation network physically close to the

MAX5096/MAX5097.

Switching Between LDO Mode

and Buck Mode

The MAX5096/MAX5097 switch between the Buck

Mode and LDO Mode on the fly. However, care must

be taken to reduce output glitch or overshoot during

the switching.

Buck Mode to LDO Mode

The LDO Mode is intended for the low 100mA output

current while the buck converter delivers up to 600mA

output current. It is important to first reduce the output

load below 100mA before switching to the LDO Mode.

If the output load is higher than 100mA, the

MAX5096/MAX5097 may go into the current limit and

the output will drop significantly. Whenever the mode is

changed, output is expected to glitch because the loop

dynamics change due to different error amplifiers when

operating in the LDO and Buck Modes. The output volt-

age undershoot can be minimized by reducing the out-

put load during switching and using larger output

capacitance.

LDO Mode to Buck Mode

When switching from the LDO Mode to Buck Mode, a

fixed amount of delay (32 cycles) is applied so that the

buck converter control loop and oscillator reach their

steady-state conditions. The 32-cycle delay translates

to approximately 250µs and 100µs for 150kHz and

330kHz switching frequency versions, respectively. It is

recommended that the output load of 600mA must be

delayed by at least this much time to allow the

MAX5096/MAX5097 to switch to high-current Buck

Mode. This ensures that the output does not drop due

to the LDO current-limit protection mechanism.

PC Board Layout Guidelines

1) Proper PC board layout is essential. Minimize

ground noise by connecting the anode of the free-

wheeling rectifier, the input bypass capacitor

ground lead, and the output filter capacitor ground

lead to a large PGND plane.

2) Minimize lead lengths to reduce stray capacitance,

trace resistance, and radiated noise. In particular,

place the Schottky/fast recovery rectifier diode right

next to the device.

CRf

PCSW

=××

CRf

CCFPO PO

=×× ×

2π

RVf

gR gV f

COC

MC OUT m ADJ PO

=×

××××

fCR

PO OUT OUT

=×× ×

2π

40V, 600mA Buck Converters with Low-

Quiescent-Current Linear Regulator Mode

16 ______________________________________________________________________________________

MAX5096/MAX5097

40V, 600mA Buck Converters with Low-

Quiescent-Current Linear Regulator Mode

______________________________________________________________________________________ 17

PART

OUTPUT

VOLTAGE

(V)

SWITCHING

FREQUENCY

(kHz)

MAX5096A_ _ _

+3.3/Adjustable

135

MAX5096B_ _ _

+5.0/Adjustable

135

MAX5097A_ _ _

+3.3/Adjustable

330

MAX5097B_ _ _

+5.0/Adjustable

330

Selector Guide

Chip Information

PROCESS: BiCMOS

3) Connect the exposed pad of the IC to the SGND

plane. Do not make a direct connection between the

exposed pad plane and SGND (pin 2) under the IC.

Connect the exposed pad and pin 2 to the SGND

plane separately. Connect the ground connection of

the feedback resistive divider, the soft-start capaci-

tor, the adjustable reset timeout capacitor, and the

compensation network to the SGND plane. Connect

the SGND plane and PGND plane at one point near

the input bypass capacitor at VIN.

4) Use the large SGND plane as a heatsink for the

MAX5096/MAX5097. Use large PGND and LX

planes as heatsinks for the rectifier diode and the

inductor.

MAX5096/MAX5097

40V, 600mA Buck Converters with Low-

Quiescent-Current Linear Regulator Mode

18 ______________________________________________________________________________________

Package Information

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,

go to www.maxim-ic.com/packages.)

QFN THIN.EPS

MAX5096/MAX5097

40V, 600mA Buck Converters with Low-

Quiescent-Current Linear Regulator Mode

______________________________________________________________________________________ 19

Package Information (continued)

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,

go to www.maxim-ic.com/packages.)

MAX5096/MAX5097

40V, 600mA Buck Converters with Low-

Quiescent-Current Linear Regulator Mode

20 ______________________________________________________________________________________

TSSOP 4.4mm BODY.EPS

AA AA

Package Information (continued)

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,

go to www.maxim-ic.com/packages.)

MAX5096/MAX5097

40V, 600mA Buck Converters with Low-

Quiescent-Current Linear Regulator Mode

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 21

Boblet

Revision History

REVISION

NUMBER

REVISION

DATE DESCRIPTION PAGES

CHANGED

0 7/06 Initial release —

1 6/07 Updated Electrical Characteristics table 1, 2, 3, 5, 20

2 9/07 Removed future product asterisks from Ordering Information table, Updated

Electrical Characteristics table and TSSOP package outline 1, 4, 18, 19, 20