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MAX5092

4V to 72V Input LDOs with Boost Preregulator

Maxim Integrated 

MAX5092/MAX5093

EVALUATION KIT AVAILABLE

4V to 72V Input LDOs with Boost Preregulator

General Description

The MAX5092A/MAX5092B/MAX5093A/MAX5093B low-

quiescent-current, low-dropout (LDO) regulators contain

simple boost preregulators operating at a high fre-

quency. The devices seamlessly provide a preset 3.3V

(MAX5092A/MAX5093A) or 5V (MAX5092B/MAX5093B)

LDO output voltage from a cold-crank through load-dump

(3.5V to 80V) input voltage conditions. The MAX5092_/

MAX5093_ deliver up to 250mA with excellent load and

line regulation. During normal operation, when the battery

is healthy, the boost preregulator is completely turned off,

reducing quiescent current to 65μA (typ). This makes the

devices suitable for always-on power supplies.

The buck-boost operation achieved by this combination of

LDO and boost preregulator offers the advantage of using

a single off-the-shelf inductor in place of the multiple-

winding custom magnetics needed in typical single-ended

primary inductor converter (SEPIC) and transformer-

based flyback topologies. The high operating frequency

of the boost regulator significantly reduces component

size. The MAX5092_ integrates a blocking diode to fur-

ther reduce the external component count. The boost

preregulator output voltage is preset to 7V. Both LDO and

boost output voltages are programmable using external

resistors. The boost preregulator output voltage is adjust-

able up to 11V(MAX5092_), or up to 12V (MAX5093_).

The LDO output voltage is adjustable from 1.5V to 9V

(MAX5092_) or from 1.5V to 10V (MAX5093_).

The devices feature a shutdown mode with 5μA (typ) shut-

down current, a HOLD input to implement a self-holding cir-

cuit, and a power-on-reset output (RESET) with an externally

programmable timeout period. Additional features include

output overload, short-circuit, and thermal protection.

The MAX5092_/MAX5093_ are available in a thermally

enhanced, 16-pin 5mm x 5mm thin QFN package and

can dissipate up to 2.7W at +70°C on a multilayer PC

board (PCB).

Applications

●● Industrial

Typical Operating Circuit and Selector Guide appear at end

of data sheet.

Features

●● Wide Operating Input Voltage Range: 3.5V to 72V

with a 4V Startup Voltage

●● LDO Output Regulates to 5V Seamlessly from an

Input Voltage of 3.5V to 72V

●● Up to 250mA Output Current

●● Preset 3.3V, 5V, or Externally Programmable LDO

Output Voltage from 1.5V to 9V (MAX5092_) or from

1.5V to 10V (MAX5093_)

●● Preset 7V or Externally Programmable Boost

Output Voltage Up to 11V (MAX5092_) or Up to 12V

(MAX5093_)

●● 65μA Quiescent Current in LDO Mode (VIN ≥ 8V)

5μA Shutdown Current

●● Power-On Reset (RESET) with Programmable

Timeout Period

●● Output Short-Circuit and Thermal Protection

●● TQFN Package Capable of Dissipating Up to 2.7W at

+70°C

Ordering Information

PART

TEMP RANGE PIN-PACKAGE

MAX5092AATE+

-40°C to +125°C 16 TQFN-EP*

MAX5092BATE+

-40°C to +125°C 16 TQFN-EP*

MAX5093AATE+

-40°C to +125°C 16 TQFN-EP*

MAX5093BATE+

-40°C to +125°C 16 TQFN-EP*

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

*EP = Exposed pad.

Pin Configuration

TOP VIEW

12 11 10 9

BSFB 13

VL 14

CT 15

RESET 16

MAX5092_/

MAX5093_

+

1

2

3

4

8 OUT

7 OUT_SENSE

6 SET

5 PGND_LDO

THIN QFN

(5mm x 5mm)

19-0659; Rev 2; 10/14

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