General Description
The MAX5087 high-voltage linear regulator operates
from an input voltage of 6.5V to 65V and delivers up to
400mA of output current. The device consumes only
70µA of quiescent current with no load and 11µA in
shutdown. The device includes a SET input, that when
connected to ground, selects a preset output voltage of
3.3V (MAX5087A) or 5.0V (MAX5087B). Alternatively,
the output voltage can be adjusted from 2.5V to 11V by
simply connecting SET to the regulator’s output through
a resistive divider network. The MAX5087 also provides
an open-drain, active-low microprocessor (µP) reset
output that asserts when the regulator output drops
below the preset output voltage threshold. An external
capacitor programs the reset timeout period. Other fea-
tures include an enable input, thermal shutdown, and
short-circuit protection.
The MAX5087 operates over the automotive tempera-
ture range of -40°C to +125°C and is available in a 16-
pin or a 56-pin TQFN thermally enhanced package.
Applications
Automotive
Industrial
Home Security/Safety
Networking
Features
♦Wide Operating Input Voltage Range (6.5V to 65V)
♦Thermally Enhanced Package Dissipates
2.6W at TA= +70°C (16-Pin TQFN)
3.8W at TA= +70°C (56-Pin TQFN)
♦Guaranteed 400mA Output Current
♦ 70µA Quiescent Supply Current
♦Preset 3.3V, 5.0V, or Adjustable 2.5V to 11V
Output Voltage
♦Remote Load Sense Capability
♦Enable Input
♦ Integrated µP Reset Circuit with Programmable
Timeout Period
♦Thermal and Short-Circuit Protection
♦-40°C to +125°C Operating Temperature Range
MAX5087
65V, 400mA, Low-Quiescent-Current
Linear Regulator with Adjustable Reset Delay
________________________________________________________________ Maxim Integrated Products 1
12 11 10 9
5
6
7
8
OUT
OUT
OUTSENSE
GND
TOP VIEW
16
15
14
13
N.C.
+
N.C.
N.C.
N.C.
1234
EN
N.C.
IN
IN
MAX5087
N.C.
CT
RESET
SET
3233343536 29303137
15
16
17
18
19
20
21
22
23
24
N.C.
N.C.
N.C.
TQFN
N.C.
N.C.
N.C.
N.C.
N.C.
CT
RESET
SET
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
EN
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
25
N.C.
N.C.
N.C.
N.C.
OUT
OUT
OUTSENSE
N.C.
IN
IN
GND
N.C.
N.C.
N.C.
N.C.
38
N.C.
394041
N.C.
N.C.
N.C.
42
N.C.
654321098711211 1413
26
27
28
53
52
51
50
49
48
47
46
45
44
56
55
54
43
MAX5087
+
TQFN
Pin Configurations
Ordering Information
19-3964; Rev 2; 7/06
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
PART PIN-
PACKAGE
PKG
CODE
OUTPUT
VOLTAGE (V)
MAX5087AATE+
16 TQFN-EP* T1655-2
3.3
MAX5087BATE+
16 TQFN-EP* T1655-2
5.0
MAX5087AATN+
56 TQFN-EP* T5688-3
3.3
MAX5087BATN+
56 TQFN-EP* T5688-3
5.0
Note: All devices are specified over the -40°C to +125°C oper-
ating temperature range.
*EP = Exposed paddle.
+Denotes lead-free package.
MAX5087
65V, 400mA, Low-Quiescent-Current
Linear Regulator with Adjustable Reset Delay
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN = 14V, IOUT = 1mA, CIN = 10µF, COUT = 15µF, VEN = 2.4V, 10kΩfrom RESET to OUT, TA= TJ= -40°C to +125°C, unless other-
wise noted. Typical specifications are at TA= +25°C.) (Note 1)
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.
IN to GND (do not exceed package power
dissipation) .........................................................-0.3V to +70V
IN to GND (T ≤300ms, IOUT ≤250mA) ..................-0.3V to +42V
EN to GND..............................................................-0.3V to +70V
CT, RESET, SET, OUT, OUTSENSE to GND ..........-0.3V to +12V
IN to OUT................................................................-0.3V to +70V
Short-Circuit Duration (VIN ≤14V)..............................Continuous
Maximum Current into Any Pin (Except IN, OUT).............±20mA
Continuous Power Dissipation (TA= +70°C)
16-Pin TQFN (derate 33.3mW/°C above +70°C)......2666mW*
56-Pin TQFN (derate 47.6mW/°C above +70°C)......3809mW*
Thermal Resistance:
θJA, 16-Pin TQFN ......................................................30.0°C/W
θJC, 16-Pin TQFN ........................................................1.7°C/W
θJA, 56-Pin TQFN ......................................................21.0°C/W
θJC, 56-Pin TQFN ........................................................0.6°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
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Input Voltage Range VIN VIN ≥ VOUT + 1.5V 6.5
65.0
V
IOUT = 0 70
150
Supply Current IQMeasured at GND,
SET = GND IOUT = 400mA
5300
µA
Shutdown Supply Current ISHDN VEN ≤ 0.4V 11 21 µA
REGULATOR
Guaranteed Output Current IOUT VIN = 6.5V, VOUT = 5.0V
400
mA
6.5V ≤ VIN ≤ 25V,
5mA ≤ IOUT ≤ 400mA
4.87
5
5.13
SET = GND,
5V version 6.5V ≤ VIN ≤ 65V,
5mA ≤ IOUT ≤ 100mA
4.850
5
5.150
6.5V ≤ VIN ≤ 25V,
5mA ≤ IOUT ≤ 400mA
3.208
3.3
3.392
SET = GND,
3.3V version 6.5V ≤ VIN ≤ 65V,
5mA ≤ IOUT ≤ 100mA
3.208
3.3
3.392
Output Voltage (Note 2) VOUT
IOUT = 5mA, adjustable range 2.5
11.0
V
Dropout Voltage ∆VDO IOUT = 400mA, VOUT = 5V (Note 3) 0.9 2.2 V
Startup Response Time Rising edge of VIN to VOUT,
RL = 500Ω, SET = GND (Note 4)
400
µs
5V version -1 +1
Line Regulation
∆VOUT /
∆VIN 8V ≤ VIN ≤ 65V 3.3V version
-0.5 +0.5
mV/V
VEN = high, regulator on 2.4
Enable Voltage VEN VEN = low, regulator off 0.4 V
*As per JEDEC51 standard (multilayer board).
MAX5087
65V, 400mA, Low-Quiescent-Current
Linear Regulator with Adjustable Reset Delay
_______________________________________________________________________________________ 3
Note 1: Limits at -40°C are guaranteed by design.
Note 2: Output voltage is tested using a pulsed load current of less than 50ms duration.
Note 3: Dropout voltage is defined as (VIN - VOUT) when VOUT is 100mV below the value of VOUT for VIN = VOUT + 3V.
Note 4: Startup time measured from 50% of VIN to 90% of VOUT.
Note 5: Continuous short-circuit protection for VIN > 14V not guaranteed.
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 14V, IOUT = 1mA, CIN = 10µF, COUT = 15µF, VEN = 2.4V, 10kΩfrom RESET to OUT, TA= TJ= -40°C to +125°C, unless other-
wise noted. Typical specifications are at TA= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
TYP
MAX
UNITS
VEN = 2.4V
0.35
Enable Input Current IEN VEN = 14V 3.4 µA
SET Reference Voltage VSET
1.200 1.235 1.260
V
SET Input Leakage Current ISET
-100 +0.5 +100
nA
Load Regulation ∆VOUT /
∆IOUT IOUT = 1mA to 400mA (Note 2) 0.1
0.35
Ω
Power-Supply Rejection Ratio PSRR IOUT = 10mA, f = 100Hz, 500mVP-P,
VOUT = 5V 70 dB
Short-Circuit Current ISC VIN < 14V (Note 5)
640
mA
Thermal Shutdown Temperature
TJ
(
SHDN
)
175
°C
Thermal Shutdown Hysteresis
∆TJ
(
SHDN
)
25 °C
RESET Voltage Threshold
VRESET
89 92 94
% VOUT
RESET Threshold Hysteresis
VRHYST
2
% VOUT
RESET Output Low Voltage VRL ISINK = 1mA 0.4 V
RESET Output Leakage Current IRH VRESET = 5V 1 µA
RESET Output Minimum Timeout
Period
When VOUT reaches RESET threshold,
CCT = Open 15 µs
ENABLE to RESET Minimum
Timeout Period When EN goes high, CCT = open
170
µs
Delay Comparator Threshold
(Rising)
1.196 1.230 1.264
V
Delay Comparator Threshold
Hysteresis
100
mV
CT Charge Current 124µA
CT Discharge Current 5mA
MAX5087
65V, 40mA, Low-Quiescent-Current
Linear Regulator with Adjustable Reset Delay
4 _______________________________________________________________________________________
Typical Operating Characteristics
(VIN = VEN = 14V, CIN = 10µF, COUT = 15µF, VOUT = 5V, SET = GND, TA= +25°C, unless otherwise specified.)
OUTPUT VOLTAGE vs.
INPUT VOLTAGE
MAX5087 toc01
VIN (V)
VOUT (V)
605545 5015 20 25 30 35 405 10
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
0
065
IOUT = 0
NO-LOAD SUPPLY CURRENT
vs. TEMPERATURE
MAX5087 toc02
TEMPERATURE (°C)
IGND (µA)
11095-25-105 35506520 80
50
40
30
20
10
60
70
80
90
100
110
120
0
-40 125
VIN = +65V
VIN = +14V
VIN = +6.5V
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX5087 toc03
TEMPERATURE (°C)
ISHDN (µA)
12511080 95-10 5 20 35 50 65-25
2
4
6
8
10
12
14
16
18
20
0
-40 140
OUTPUT VOLTAGE
vs. TEMPERATURE
MAX5087 toc04
TEMPERATURE (°C)
VOUT (V)
12511080 95-10 520 35 50 65-25
4.80
4.85
4.90
4.95
5.00
5.05
5.10
5.15
5.20
5.25
4.75
-40 140
IOUT = 5mA
GROUND CURRENT
vs. TEMPERATURE (PULSED LOAD)
MAX5087 toc05
TEMPERATURE (°C)
IGND (mA)
1251109580655035205-10-25
1
2
3
4
5
6
0
-40 140
VIN = +6.5V
IOUT = 50mA IOUT = 100mA
IOUT = 400mA
OUTPUT VOLTAGE
vs. LOAD CURRENT AND TEMPERATURE
MAX5087 toc06
TEMPERATURE (°C)
VOUT (V)
12511080 95-10 5 20 35 50 65-25
4.80
4.85
4.90
4.95
5.00
5.05
5.10
5.15
5.20
5.25
4.75
-40 140
VIN = +6.5V
IOUT = 100mA
IOUT = 50mA
IOUT = 400mA
DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX5087 toc07
IOUT (mA)
VDROPOUT (V)
350300200 25050 100 150
0.15
0.30
0.45
0.60
0.75
0.90
1.05
1.20
1.35
1.50
0
0 400
VOUT = +5V
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX5087 toc08
FREQUENCY (kHz)
PSRR (dB)
100101
-70
-60
-50
-40
-30
-20
-10
0
-80
0.1 1000
COUT = 15µF
IOUT = 10mA
LOAD-TRANSIENT RESPONSE
MAX5087 toc09
400µs/div
VOUT
200mV/div
AC-COUPLED
IOUT
200mA/div
5mA
400mA
IOUT = 5mA
MAX5087
65V, 400mA, Low-Quiescent-Current
Linear Regulator with Adjustable Reset Delay
_______________________________________________________________________________________ 5
INPUT VOLTAGE STEP RESPONSE
MAX5087 toc10
400µs/div
VOUT
AC-COUPLED
500mV/div
26V
6.5V
VIN
10V/div
IOUT = 50mA
STARTUP RESPONSE
MAX5087 toc11
400µs/div
VOUT
2V/div
VIN
10V/div
IOUT = 5mA
0V
0V
ENABLE STARTUP RESPONSE
MAX5087 toc12
100µs/div
EN
1V/div
VOUT
2V/div
VIN = 14V
IOUT = 0
0V
0V
ENABLE STARTUP RESPONSE
MAX5087 toc13
100µs/div
EN
1V/div
VOUT
2V/div
VIN = 14V
IOUT = 400mA
0V
0V
ENABLE STARTUP RESPONSE
MAX5087 toc14
100µs/div
EN
1V/div
VOUT
2V/div
VIN = 65V
IOUT = 0
0V
0V
ENABLE STARTUP RESPONSE
MAX5087 toc15
100µs/div
EN
1V/div
VOUT
2V/div
VIN = 65V
IOUT = 400mA
0V
0V
SHUTDOWN RESPONSE
MAX5087 toc16
20ms/div
EN
1V/div
VOUT
2V/div
IOUT = 5mA
0V
0V
GROUND CURRENT DISTRIBUTION
(TA = -40°C)
MAX5087 toc17
IGND (µA)
NUMBER OF UNITS
656454 55 56 57 58 60 61 6259 63
5
10
15
20
25
30
35
40
0
51 52 53
150 UNITS
TESTED
GROUND CURRENT DISTRIBUTION
(TA = +125°C)
MAX5087 toc18
IGND (µA)
NUMBER OF UNITS
74 75 767363 65 66 68 69 7067 7271
5
10
15
20
25
30
35
40
0
150 UNITS
TESTED
Typical Operating Characteristics (continued)
(VIN = VEN = 14V, CIN = 10µF, COUT = 15µF, VOUT = 5V, SET = GND, TA= +25°C, unless otherwise specified.)
MAX5087
65V, 400mA, Low-Quiescent-Current
Linear Regulator with Adjustable Reset Delay
6 _______________________________________________________________________________________
Pin Description
PIN
16-PIN TQFN 56-PIN TQFN
NAME FUNCTION
1, 12–16
1–13, 15,
18–20, 25–28,
32–56
N.C. No Connection. Not internally connected.
214EN
Enable Input. Drive EN high to turn on the regulator. Force EN low to place the
device in shutdown mode.
3, 4 16, 17 IN Regulator Input. Supply voltage ranges from 6.5V to 65V. Bypass IN to GND with a
10µF capacitor.
5, 6 21, 22 OUT Regulator Output. Connect at least a 15µF low-ESR capacitor from OUT to GND.
723
OUTSENSE
Regulator Output Feedback Point. OUTSENSE must be connected to OUT for fixed
output voltage versions. Leave OUTSENSE open for adjustable output voltage
version.
8 24 GND Ground
9 29 SET
Feed b ack Reg ul ati on S et P oi nt. C onnect S E T to GN D for a fi xed 3.3V outp ut
( M AX 5087A) or 5.0V outp ut ( M AX 5087B) . C onnect an exter nal r esi sti ve d i vi d er netw or k
fr om OU TS E N S E to S E T to GN D to ad j ust the outp ut vol tag e fr om 2.5V to 11V .
10 30 RESET Open-Drain Active-Low Reset Output. Connect a 10kΩ pullup resistor from RESET
to any supply voltage up to 11V to create a logic output.
11 31 CT
Reset Timeout Setting Connection. A 2µA charging current is available at CT.
Connect a capacitor from CT to GND to set the reset timeout period (see the
Adjustable Reset Timeout Period (CT) section).
——EP
Exposed Paddle. Connect externally to a large ground plane to aid heat
dissipation. Do not use EP as a ground connection.
MAX5087
65V, 400mA, Low-Quiescent-Current
Linear Regulator with Adjustable Reset Delay
_______________________________________________________________________________________ 7
MAX5087
ERROR
AMPLIFIER
EN
IN
OUT
SET
CT
RESET
GND
OUTSENSE
CONTROL LOGIC,
THERMAL SHUTDOWN,
AND
OVERCURRENT
PROTECTION
MUX
2µA
DELAY
COMPARATOR
CT
COMPARATOR
0.92 x VREF
VREF
1.235V
INTERNAL
SUPPLY VOLTAGE
Figure 1. Functional Diagram
Detailed Description
The MAX5087 high-voltage linear regulator includes an
integrated µP reset circuit with an adjustable reset time-
out period (see the Adjustable Reset Timeout Period
(CT) section). The device guarantees a 400mA load
current and is available with a preset output voltage of
3.3V (MAX5087A) or 5V (MAX5087B). Both devices can
be configured to provide an adjustable output voltage
from 2.5V to 11V. The internal reset circuit monitors the
regulator output voltage and asserts RESET low when the
regulator output falls below the reset threshold voltage.
Other features include an enable (regulator control input),
21µA (max) shutdown current, short-circuit protection
(see the Output Short-Circuit Current Limit section), and
thermal shutdown (see the Thermal Protection section).
Regulator
The MAX5087 accepts an input voltage range from
6.5V to 65V and offers a fixed output voltage of 3.3V or
5V. For an adjustable output voltage operation, use an
external resistive divider network connected between
OUT, SET, and GND (see Figure 2).
Enable Input (EN)
EN is a logic-level enable input that turns the device
on/off. Drive EN high to turn on the device and drive EN
low to place the device in shutdown. The MAX5087
draws 11µA (typ) of supply current when in shutdown.
EN withstands voltages up to +70V, allowing EN to be
connected to IN for an always-on operation.
Remote Sensing (OUTSENSE)
The 3.3V (MAX5087A) and 5V (MAX5087B) output volt-
age versions connect OUTSENSE for load voltage
sensing. Leave OUTSENSE open when using
adjustable output voltage version.
Reset Output (
RESET
)
A supervisor circuit is fully integrated in the MAX5087
and uses the same reference voltage as the regulator.
RESET goes low if VOUT drops below the preset output
voltage threshold, and remains low at least for the time-
out period after VOUT rises above the reset voltage
threshold.
Adjustable Reset Timeout Period (CT)
The MAX5087 features a user-adjustable reset timeout.
Connect a capacitor from CT to GND to set the reset
timeout period (see Figure 2) and use the following
equation to calculate the timeout period:
tRP = CCT x 0.6175 x 106(s)
where CCT is the value of the external capacitor con-
nected from CT to GND.
Thermal Protection
When the junction temperature exceeds TJ= +175°C,
an internal thermal sensor signals the shutdown logic,
which turns off the pass transistor, allowing the IC to
cool. The thermal sensor turns the pass transistor on
again after the IC’s junction temperature cools by 25°C,
resulting in a cycled output during continuous thermal-
overload conditions. Thermal protection protects the
MAX5087 in the event of fault conditions. During contin-
uous operation, do not exceed the absolute maximum
junction temperature rating of TJ= +150°C.
Output Short-Circuit Current Limit
The MAX5087 features a current limit. The output can
be shorted to GND for an indefinite period of time (for
VIN < 14V) without damage to the device. Continuous
output short-circuit protection is only guaranteed for
VIN < 14V.
MAX5087
65V, 400mA, Low-Quiescent-Current
Linear Regulator with Adjustable Reset Delay
8 _______________________________________________________________________________________
6.5V TO 65V 2.5V TO 11V
10µF
CCT
15µF
OUT
ON
OFF OUTSENSE
SET
IN
R1
R2
VOUT = VSET (1 + R1 / R2)
VSET = 1.235V
EN
TO µPRESET
CT
GND
MAX5087
Figure 2. Setting the Adjustable Output Voltage
MAX5087
65V, 400mA, Low-Quiescent-Current
Linear Regulator with Adjustable Reset Delay
_______________________________________________________________________________________ 9
Applications Information
Output-Voltage Selection
The MAX5087 features a Dual ModeTM operation, in
either a preset-voltage mode or an adjustable mode. In
preset-voltage mode, internal feedback resistors set
the MAX5087’s output voltage to +3.3V or +5V. Select
preset-voltage mode by connecting SET to ground. In
adjustable mode, select an output between +2.5V and
+11V using two external resistors connected as a volt-
age-divider to SET (Figure 2). Set the output voltage
using the following equation:
where VSET = 1.235V and R2 is chosen to be < 100kΩ.
Available Output-Current Calculation
The MAX5087 high-voltage regulator provides up to
400mA of output current. The input voltage extends to
+65V. Package power dissipation limits the amount of
output current available for a given input/output voltage
and ambient temperature. Figure 3 shows the maxi-
mum power dissipation curve for these devices. The
graph assumes that the exposed paddle of the MAX5087
package is set up per JEDEC 51 (multilayer board)
specifications.
Use Figure 3 to determine the allowable package dissi-
pation (PD) for a given ambient temperature.
Alternately, use the following formulas to calculate the
allowable package dissipation. Note that for the exam-
ples shown below, the electrical characteristic limits are
guaranteed up to TJ= +125°C (max).
For the 56-pin TQFN package:
For the 16-pin TQFN package:
After determining the allowable package dissipation
calculate the maximum output current using the follow-
ing formula:
The above equations do not include the negligible
power dissipation from self-heating due to the IC
ground current.
Example 1: MAX5087BATN+
TA= +95°C
VIN = +14V
VOUT = +5V
Find the maximum allowable output current. First calcu-
late package dissipation at the given temperature as
follows:
Then determine the maximum output current:
I(2.619W)
(14V) (5V) 291mA
OUT(MAX) =−=
P 3.809W 0.0476 W
C(95 C 70 C) 2.619W
D =−°°−°=
IP
VV 4 0mA
OUT(MAX) D
IN OUT
≅−≤ 0
P
W for T C
WW
Cx T C for C T C
D
A
AA
.
. . ( )
=
≤+°
−°−°+°<≤+°
⎧
⎨
⎪
⎩
⎪
⎫
⎬
⎪
⎭
⎪
2 666 70
2 666 0 0333 70 70 125
P
W for T C
WW
Cx T C for C T C
D
A
AA
.
. . ( )
=
≤+°
−°−°+°<≤+°
⎧
⎨
⎪
⎩
⎪
⎫
⎬
⎪
⎭
⎪
3 809 70
3 809 0 0476 70 70 125
VVx
R
R
OUT SET
=+
⎛
⎝
⎜⎞
⎠
⎟
11
2
MAX5087 fig03
TEMPERATURE (°C)
PD (W)
12020 60 80 10040
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0
0 140
3.809W
(56-PIN TQFN)
2.666W
(16-PIN TQFN)
DERATE
47.6mW/°C
DERATE
33.3mW/°C
Figure 3. Calculated Maximum Power Dissipation vs.
Temperature
Dual Mode is a trademark of Maxim Integrated Products, Inc.
MAX5087
65V, 400mA, Low-Quiescent-Current
Linear Regulator with Adjustable Reset Delay
10 ______________________________________________________________________________________
Example 2: MAX5087AATN+
TA= +125°C
VIN = +14V
VOUT = +3.3V
Calculate package dissipation at the given temperature
as follows:
And establish the maximum current:
Example 3: MAX5087BATN+
TA= +50°C
VIN = +14V
VOUT = +5V
Calculate package dissipation at the given temperature
as follows:
PD= 3.809W
And find the maximum output current:
In example 3 the maximum output current is calculated
as 423mA, however, the maximum output current can-
not exceed 400mA.
Use Figures 4a and 4b to quickly determine maximum
allowable output current for selected ambient temperatures.
Output-Capacitor Selection and
Regulator Stability
For stable operation over the full temperature range
and with load currents up to 400mA, use a 15µF (min)
output capacitor with an ESR < 0.25Ω. To reduce noise
and improve load-transient response, stability, and
power-supply rejection use larger output capacitor val-
ues such as 22µF.
Some ceramic capacitor dielectrics exhibit large
capacitance and ESR variation with temperature. For
capacitor dielectrics such as Y5V, use 22µF or more to
ensure stability at temperatures below -10°C. With X7R
or X5R dielectrics, 15µF should be sufficient at all oper-
ating temperatures. To improve power supply rejection
and transient response, use a minimum 10µF capacitor
from IN to GND.
I(3.809W)
(14V) (5V) mA I 4 0mA
OUT(MAX) OUT(MAX)
. =−=⇒=423 2 0
I(1.191W)
(14V) (3.3V) mA
OUT(MAX) .=−=111 3
P 3.809W 0.0476 W
C(125 C 70 C) 1 W
D .=−°°−°=191
MAX5087 fig04A
VIN (V)
IOUT(MAX) (A)
60555045403530252015105
0.25
0.20
0.15
0.10
0.05
0.30
0.35
0.40
0.45
0.50
0
065
VOUT = 5V
(56-PIN TQFN)
TA = +70°C
TA = +85°C
TA = +125°C
Figure 4a. Maximum Output Current vs. Input Voltage (56-Pin
TQFN)
Chip Information
PROCESS: BiCMOS
MAX5087 fig04B
VIN (V)
IOUT(MAX) (A)
60555045403530252015105065
VOUT = 5V
(16-PIN TQFN)
TA = +70°C
TA = +85°C
TA = +125°C
0.25
0.20
0.15
0.10
0.05
0.30
0.35
0.40
0.45
0.50
0
Figure 4b. Maximum Output Current vs. Input Voltage (16-Pin
TQFN)
MAX5087
65V, 400mA, Low-Quiescent-Current
Linear Regulator with Adjustable Reset Delay
______________________________________________________________________________________ 11
QFN THIN.EPS
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.)
MAX5087
65V, 400mA, Low-Quiescent-Current
Linear Regulator with Adjustable Reset Delay
12 ______________________________________________________________________________________
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.)
MAX5087
65V, 400mA, Low-Quiescent-Current
Linear Regulator with Adjustable Reset Delay
______________________________________________________________________________________ 13
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.)
56L THIN QFN.EPS
PACKAGE OUTLINE
21-0135 2
1
E
56L THIN QFN, 8x8x0.8mm
MAX5087
65V, 400mA, Low-Quiescent-Current
Linear Regulator with Adjustable Reset Delay
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.
14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2006 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
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.)
PACKAGE OUTLINE
21-0135
2
2
E
56L THIN QFN, 8x8x0.8mm
Revision History
Pages changed at Rev 2: 2, 14
ENGLISH • ???? • ??? • ???
WHAT'S NEW
PRODUCTS
SOLUTIONS
DESIGN
APPNOTES
SUPPORT
BUY
COMPANY
MEMBERS
Maxim > Products > Power and Battery M anagement
MAX5087
65V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay
400mA, 65V Input, Low-Quiescent-Current Linear Regulators in High-Power TQFN Packages
QuickView
Technical Documents
Ordering Info
More Information
All
Ordering Information
Notes:
Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.1.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one
business day.
2.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data
Sheet or Part Naming Conventions.
3.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses.4.
Devices: 1-8 of 8
MAX5087A
Free
Sam ple
Buy
Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
Temp
RoHS/Lead-Free?
Materials Analysis
MAX5087AATE
THIN QFN;16 pin;26 mm
Dwg: 21-0140L (PDF)
Use pkgcode/variation: T1655-2*
-40C to +125C
RoHS/Lead-Free: See data sheet
Materials Analysis
MAX5087AATE+T
THIN QFN;16 pin;26 mm
Dwg: 21-0140L (PDF)
Use pkgcode/variation: T1655+2*
-40C to +125C
RoHS/Lead-Free: Lead Free
Materials Analysis
MAX5087AATE+
THIN QFN;16 pin;26 mm
Dwg: 21-0140L (PDF)
Use pkgcode/variation: T1655+2*
-40C to +125C
RoHS/Lead-Free: Lead Free
Materials Analysis
MAX5087AATE-T
THIN QFN;16 pin;26 mm
Dwg: 21-0140L (PDF)
Use pkgcode/variation: T1655-2*
-40C to +125C
RoHS/Lead-Free: See data sheet
Materials Analysis
MAX5087B
Free
Sam ple
Buy
Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
Temp
RoHS/Lead-Free?
Materials Analysis
MAX5087BATE
THIN QFN;16 pin;26 mm
Dwg: 21-0140L (PDF)
Use pkgcode/variation: T1655-2*
-40C to +125C
RoHS/Lead-Free: See data sheet
Materials Analysis
MAX5087BATE+
THIN QFN;16 pin;26 mm
Dwg: 21-0140L (PDF)
Use pkgcode/variation: T1655+2*
-40C to +125C
RoHS/Lead-Free: Lead Free
Materials Analysis
MAX5087BATE+T
THIN QFN;16 pin;26 mm
Dwg: 21-0140L (PDF)
Use pkgcode/variation: T1655+2*
-40C to +125C
RoHS/Lead-Free: Lead Free
Materials Analysis
MAX5087BATE-T
THIN QFN;16 pin;26 mm
Dwg: 21-0140L (PDF)
Use pkgcode/variation: T1655-2*
-40C to +125C
RoHS/Lead-Free: See data sheet
Materials Analysis
Didn't Find What You Need?
Next Day Product Selection Assistance from Applications Engineers
Parametric Search
Applications Help
QuickView
Technical Documents
Ordering Info
More Information
Description
Key Features
Applications/U s es
Key Specifications
Diagram
Data Sheet
Application Notes
Design Guides
Engineering Journals
Reliability Reports
Software/Models
Evaluation Kits
P rice and A vailability
Samples
Buy O nline
P ackage Information
Lead-Free Information
Related Produc ts
Notes and C omments
Evaluation Kits
Document Ref.: 1 9-3964; Rev 2; 2006-08-07
This page last modified: 2 0 06-12-12
CONTACT US: SEND US AN EMAIL
C opyright 20 0 7 by M axim Integrated Produc ts, Dallas Semiconduc tor • Legal Notices • Privacy P olicy