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MAX1836

24V Internal Switch, 100% Duty Cycle, Step-Down Converters

Maxim Integrated 

MAX1836/MAX1837

EVALUATION KIT AVAILABLE

24V Internal Switch, 100% Duty Cycle,

Step-Down Converters

General Description

The MAX1836/MAX1837 high-efficiency step-down con-

verters provide a preset 3.3V or 5V output voltage from

supply voltages as high as 24V. Using external feedback

resistors, the output voltage can be adjusted from 1.25V

to VIN. An internal current-limited switching MOSFET

delivers load currents up to 125mA (MAX1836) or 250mA

(MAX1837).

The unique current-limited control scheme, operating

with duty cycles up to 100%, minimizes the dropout volt-

age (120mV at 100mA). Additionally, this control scheme

reduces supply current under light loads to 12μA. High

switching frequencies allow the use of tiny surface-mount

inductors and output capacitors.

The MAX1836/MAX1837 step-down converters with inter-

nal switching MOSFETs are available in 6-pin SOT23

and 3mm x 3mm TDFN packages, making them ideal

for low-cost, low-power, space-sensitive applications.

For increased output drive capability, use the MAX1776

step-down converter that uses an internal 24V switch to

deliver up to 500mA. For even higher currents, use the

MAX1626/MAX1627 step-down controllers that drive an

external P-channel MOSFET to deliver up to 20W.

Applications

●● 9V Battery Systems

●● Notebook Computers

●● Distributed Power Systems

●● Backup Supplies

●● 4mA to 20mA Loop Power Supplies

●● Industrial Control Supplies

●● Handheld Devices

Typical Operating Circuit

INPUT

4.5V TO 24V

IN

LX

SHDN

MAX1836

MAX1837 OUT

OUTPUT

3.3V OR 5V

GND

FB

NOTE: HIGH-CURRENT PATHS SHOWN WITH BOLD LINES.

Features

●● 4.5V to 24V Input Voltage Range

●● Preset 3.3V or 5V Output

●● Adjustable Output from 1.25V to VIN

●● Output Currents Up to 125mA (MAX1836) or

250mA (MAX1837)

●● Efficiency Over 90%

●● 12μA Quiescent Current

●● 3μA Shutdown Current

●● 100% Maximum Duty Cycle for Low Dropout

●● Small 6-Pin SOT23 and TDFN Packages

Ordering Information

PART

TEMP RANGE

PIN-

PACKAGE

MAX1836ETT33-T -40°C to +85°C 6 TDFN-EP*

MAX1836ETT50-T -40°C to +85°C 6 TDFN-EP*

MAX1836EUT33-T -40°C to +85°C 6 SOT23

MAX1836EUT50-T -40°C to +85°C 6 SOT23

MAX1837ETT33-T -40°C to +85°C 6 TDFN-EP*

MAX1837ETT50-T -40°C to +85°C 6 TDFN-EP*

MAX1837EUT33-T -40°C to +85°C 6 SOT23

MAX1837EUT50-T

*EP = Exposed pad.

T = Tape and reel.

-40°C to +85°C

6 SOT23

Selector Guide appears at end of data sheet.

TOP

MARK

AJG

AJE

AANY

AANW

AJH

AJF

AANZ

AANX

Pin Configurations

TOP VIEW

FB 1

GND 2

IN 3

6 OUT

FB 1

MAX1836

MAX1837

5

SHDN

GND 2

IN 3

4 LX

MAX1836

MAX1837

TDFN

6 OUT

5 SHDN

4 LX

SOT23

19-1919; Rev 3; 7/06

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