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MAX5091

28V, 100mA, Low-Quiescent-Current LDO with Reset and Power-Fail Input/Output

Maxim Integrated 

MAX5091

28V, 100mA, Low-Quiescent-Current LDO

with Reset and Power-Fail Input/Output

General Description

The MAX5091 high-voltage linear regulator is designed to

operate from a +5V to +28V input voltage, and withstands

up to 40V transients. The device consumes only 45μA of

quiescent current at 100μA output current. The MAX5091

delivers up to 100mA of output current with low 50mV

maximum dropout voltage. The MAX5091 provides an

active-low open-drain microprocessor RESET output. The

reset timeout period is programmable and can be set with

an external capacitor. The MAX5091 includes an uncom-

mitted comparator for input voltage monitoring/power-

fail indication. The device is available with a fixed +5V

(MAX5091A) or +3.3V (MAX5091B) output. The MAX5091

is short-circuit protected and includes thermal shutdown.

The MAX5091 operates over the -40°C to +125°C auto-

motive temperature range and is available in 8-pin, ther-

mally enhanced TDFN-EP and SO-EP packages.

Applications

●● Industrial

●● Home Security/Safety

●● Telecom/Networking

Features

●● +5V to +28V Wide Operating Input Voltage Range

●● Withstands 40V Input Voltage Transients

●● Guaranteed 100mA Output Current

●● 45μA Typical Quiescent Current at 100μA Output

Current

●● Preset +5V (MAX5091A) or +3.3V (MAX5091B)

Output Voltage

●● Stable with Only 10μF Output Capacitance

●● RESET Output with Adjustable Timeout Period

●● Uncommitted Comparator for Voltage Monitoring/

Power-Fail Indication

●● Output Overload and Short-Circuit Protection

●● Thermal Shutdown

●● Available in 8-Pin TDFN (1.95W at TA = +70°C) and

8-Pin SO (1.5W at TA = +70°C)

●● Operates Over -40°C to +125°C Automotive

Temperature Range

Ordering Information

PART

TEMP RANGE

MAX5091AATA+T

-40°C to +125°C

MAX5091AASA+

-40°C to +125°C

MAX5091BATA+T

-40°C to +125°C

MAX5091BASA+

-40°C to +125°C

PRESET VOUT (V)

5

5

3.3

3.3

PIN-PACKAGE

8 TDFN-EP*

8 SO-EP*

8 TDFN-EP*

8 SO-EP*

TOP MARK

+APB

—

+APC

—

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

T = Tape and reel.

Typical Application Circuit

Pin Configurations

+5V TO +28V

VIN

RH

288kΩ

CIN

10µF

ON

OFF

RL

100kΩ

CCT

0.1µF

VS

VOUT

MAX5091

EN

SI

RES

CT

SO

GND

+5V (MAX5091A)/

+3.3V (MAX5091B)

100mA

RRES

10kΩ

COUT

10µF

RSO

10kΩ

µC

RESET

POWER-

FAIL

TOP VIEW

VOUT SO RES GND

8765

MAX5091

EXPOSED PADDLE

+

1 234

VS SI EN CT

TDFN

(3mm x 3mm)

Pin Configurations continued at end of data sheet.

19-0654; Rev 1; 5/14

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