APE8977MP-HF - Advanced Power Electronics Corp. USA

Advanced Power

Electronics Corp. 2.5A LINEAR REGULATOR

FEATURE

DESCRIPTIOON

Sink and Source up to 2.5Amp

Integrated Power MOSFETs

High Accuracy Output Voltage at Full-Load

Output Adjustment by Two External Resistors

Built-in Soft-start Function

Current Limiting Protection

On-Chip Thermal Protection

Available in ESOP-8 (Exposed Pad) Packages

VIN and VCNTL Under Voltage Protection

RoHS Compliant and 100% Lead (Pb)-Free

APPLICATIO

Desktop PCs, Notebooks, and Workstations

Graphics Card Memory Termination

Set Top Boxes, Digital TVs, Printers

Embedded Systems

Active Termination Buses

Data and specifications subject to change without notice

201201101

APE8977MP

TYPICAL APPLICATION

The APE8977MP is a simple, cost-effective and

high-speed linear regulator. The regulator is capable o

actively sinking or sourcing up to 2.5A while regulating

an output voltage to within 40mV. The desired output

voltage can be programmed by two external voltage

divider resistors of the REFEN pin.

The APE8977MP also incorporates a high-speed

differential amplifier to provide ultra-fast response in

line/load transient. Other features include extremely low

initial offset voltage, excellent load regulation, current

limiting in bi-directions and on-chip thermal shut-down

protection. Built-in soft-start function avoids a mis-

operation by inrush current.

The APE8977MP are available in the ESOP-8

(Exposed Pad) surface mount packages.

VIN

Shutdown

Enable

VCNTL

VOUT

VIN

REFEN

VCNTL

VOUT

GND

R2 CSS

CIN CCNTL

COUT RDUMMY

RTT

APE8977MP

R1 = R2 = 100KΩ ,RTT=50Ω /33Ω /25Ω

COUT = 10uF ( + 100 uF under the wor st case testin g condition )

CSS = 1uF , CIN = 470 uF (Low ESR ) , CCNTL = 47uF

Advanced Power

Electronics Corp. APE8977MP

ABSOLUTE MAXIMUM RATINGS(Note1)

Input Voltage (VIN) -----------------------------------------

CNTL Pin Voltage (VCNTL) -------------------------------

Power Dissipation (PD) -----------------------------------

Internally Limited

Storage Temperature Range (TST) --------------------

-65 to +150°C

Lead Temperature (Soldering, 10sec.) ---------------

260°C

28°C/W

Note1 : Exceeding the absolute maximum rating may damage the device.

OPERATING RATING(Note2)

Input Voltage (VIN) -----------------------------------------

2.5V to 1.5V +3%

CNTL Pin Voltage (VCNTL) -------------------------------

5.5V or 3.3V +5%

Junction Temperature Range (TJ) ---------------------

-40 to +125°C

Ambient Temperature Range (TA) --------------------- -40 to +85°C

Note2 : The device is not guaranteed to function outside its operating conditions.

ORDERING / PACKAGE INFORMATION

(VIN=1.8V, VCNTL=3.3V, VREFEN=0.9V, COUT=10uF(Ceramic), T

=25oC, unless otherwise specified)

Parameter SYM TEST CONDITION MIN TYP MAX UNITS

VCNTL Operation Current ICNTL IOUT = 0A - 1 2.5 mA

Standby Current ISTBY VREFEN= 0V (Shutdown) - 25

VIN Shutdown Current IVIN VREFEN= 0V (Shutdown) - - 5uA

VCNTL UVP Rising Threshold VCOP VCNTL Rising 2.4 2.55 2.7 V

VCNTL UVP Hysteresis VCHYS -0.35 -V

VIN UVP Rising Threshold VIOP VIOP Rising 0.8 0.95 1.1 V

VIN UVP Hysteresis VIHYS -0.15 -V

IOUT = 10mA -20 - 20

IOUT = -10mA -20 - 20

IOUT = 10mA ~ 2A -20 - 20

IOUT = -10mA ~ -2A -20 - 20

Thermal Resistance from Junction to Case (R thjc)

Output (DDR / DDRII / DDRIII)

Load Regulation(Note4) ΔVLoad

UVP Function

Output Offset Voltage(Note3) ΔVLoad

ELECTRICAL SPECIFICATIONS

Input

(Top View )

REFEN

ESOP-8

NCGND

VIN

VCNTL

VOUT

GND

Rth

a = 75oC/W

APE8977X-HF

Package Type

Halogen-Free

MP : ESOP-8

Advanced Power

Electronics Corp. APE8977MP

Parameter SYM TEST CONDITION MIN TYP MAX UNITS

Current Limit ILIM VCNTL=5V, VIN=1.5V, VOUT=1.0V 2.5 - - A

Thermal Shutdown Temperature TSD 3.3V < VCNTL < 5V - 150 -

Thermal Shutdown Hysteresis ΔTSD 3.3V < VCNTL < 5V - 20 -

REFEN Threshold VEN 0.15 - 0.4 V

Soft-Start Interval TSS ∆VOUT=1V - 0.8 - ms

Note3. VOS offset is the voltage measurement defined as VOUT subtracted from VREFEN.

Note4. Regulation is measured at constant junction temperature by using a 1ms(on) / 9ms(off) current pulse. Devices are tested for load regulation

in the load range from 10mA to 2A for source and -10mA to -2A for sink capability.

PIN DESCRIPTIONS

PIN SYMBOL PIN DESCRIPTION

VIN Power Input Voltage.

GND Ground Pin

VOUT Output Voltage

VCNTL Gate Drive Voltage

REFEN Reference Voltage Input and Chip Enable

BLOCK DIAGRAM

ELECTRICAL SPECIFICATION

ENABLE and Soft-Start

Protection

VCNTL

ENABLE

FUNCTION

Soft-Start

Function

GATE

CONTROL

LOGIC

OCP

Function

UVP

Function

OTP

Function

REFEN

VIN

VOUT

GND

ERROR

AMPLIFIER

Advanced Power

Electronics Corp. APE8977MP

APPLICATION INFORMATION

Input Capacitor and Layout Consideration

Consideration while designs the resistance of voltage divider

Thermal Consideration

Make sure the sinking current capability of pull-down NMOS if the lower resistance was

chosen so that the voltage on VREFEN is below 0.15V. In addition, the capacitor and voltage divider

form the lowpass filter. There are two reasons doing this design; one is for output voltage soft-

start while another is for noise immunity.

APE8977MP regulators have internal thermal limiting circuitry designed to protect the device

during overload conditions.For continued operation, do not exceed maximum operation junction

temperature 125oC. The power dissipation definition in device is:

PD = (VIN - VOUT) x IOUT + VIN x IQ

The maximum power dissipation depends on the thermal resistance of IC package, PCB

layout, the rate of surroundings airflow and temperature difference between junction to ambient.

The maximum power dissipation can be calculated by following formula:

PD(MAX) = ( TJ(MAX) -TA ) / Rthja

Where TJ(MAX) is the maximum operation junction temperature 125oC, TAis the ambient

temperature and the Rthja is the junction to ambient thermal resistance. The junction to ambient

thermal resistance (Rthja is layout dependent) for ESOP-8 package (Exposed Pad) is 75oC/W on

standard JEDEC 51-7 (4 layers, 2S2P) thermal test board. The maximum power dissipation at TA

= 25oC can be calculated by following formula:

PD(MAX) = (125oC - 25oC) / 75oC/W = 1.33W

The thermal resistance Rthja of ESOP-8 (Exposed Pad) is determined by the package design

and the PCB design. However, the package design has been decided. If possible, it's useful to

increase thermal performance by the PCB design. The thermal resistance can be decreased by

adding copper under the expose pad of ESOP-8 package. We have to consider the copper

couldn't stretch infinitely and avoid the tin overflow.

Place the input bypass capacitor as close as possible to the APE8977MP. A low ESR

capacitor larger than 470uF is recommended for the input capacitor. Use short and wide traces to

minimize parasitic resistance and inductance.

Inappropriate layout may result in large parasitic inductance and cause undesired oscillation

between APE8977MP and the preceding powe converter.

Advanced Power

Electronics Corp. APE8977MP

TYPICAL PERFORMANCE CHARACTERISTICS

VIN = 1.8V, VCNTL = 3.3V, IOUT = 0A, Source test VIN = 1.8V, VCNTL = 3.3V, IOUT = 10mA, Source test

IOUT = 0A, Source test

Load Transient (Source test) Load Transient (Sink test)

VIN = 5V, VCNTL = 5V VIN = 5V, VCNTL = 5V

VREF = 2.5V Supplied by a regulatorVREF = 2.5V Supplied by a regulator

IOUT = 0A, Source test

VIN

VOUT

IOUT

VIN

VOUT

IOUT

Output Voltage vs. Temperature

0.7

0.8

0.9

1.1

-50 -25 0 25 50 75 100 125

Temperature (oC)

Output Voltage (V)

Shutdown Threshold vs. Temperature

0.25

0.3

0.35

0.4

0.45

0.5

0.55

-50 -25 0 25 50 75 100 125

Temperature (oC)

Shutdown Threshold (V)

Turn On

Turn Off

VIN Current vs. Temperature

-50 -25 0 25 50 75 100 125

Temperature (oC)

VIN Current (uA)

VCNTL Current vs. Temperature

1.5

2.5

3.5

-50 -25 0 25 50 75 100 125

Temperature (oC)

VCNTL Current (mA)

VIN=1.8V, VCNTL=5V

VIN=1.8V, VCNTL=3.3V

VIN=1.5V, VCNTL=5V

VIN=1.5V, VCNTL=3.3V

VIN=1.8V, VCNTL=3.3V

Advanced Power

Electronics Corp. APE8977MP

TYPICAL PERFORMANCE CHARACTERISTICS

Source Current Limit vs. Temperature

4.5

5.5

-50 -25 0 25 50 75 100 125

Temperature (oC)

Source Current Limit (A)

Sink Current Limit vs. Temperature

3.5

4.5

5.5

-50 -25 0 25 50 75 100 125

Temperature (oC)

Sink Current Limit (A)

VIN=1.8V, VCNTL=3.3V

VIN=1.8V, VCNTL=5V

VIN=1.8V, VCNTL=3.3V

VIN=1.8V, VCNTL=5V

Advanced Power

Electronics Corp. APE8977MP

MARKING INFORMATION

ESOP-8

8977MP

YWWSSS

Part Number

Date Code (YWWSSS)

Y：Last Digit Of The Year

WW：Week

SSS：Se

uence

Package Code