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MAX1837

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

Please check latest availability status for a specific part variant.

Overview

Description

The MAX1836/MAX1837 high-efficiency step-down converters 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 V_IN. 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 voltage (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 internal 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.

MAX1836, MAX1837: Functional Diagram

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Key Features

4.5V to 24V Input Voltage Range
Preset 3.3V or 5V Output
Adjustable Output from 1.25V to V_IN
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

Applications/Uses

4mA to 20mA Loop Power Supplies
9V Battery Systems
Backup Supplies
Distributed Power Systems
Handheld Devices
Industrial Control Supplies
Notebook Computers

Parametric Specs

See parametric specs for Step-Down Switching Regulators (409)

Part Number	V_IN (V)	V_IN (V)	V_OUT1 (V)	V_OUT1 (V)	I_OUT1 (A)	Switch Type
	min	max	min	max	max
MAX1836	4.5	24	1.25	24	0.125	Internal
MAX1837					0.25

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources

MAX1837EVKIT: Evaluation Kit for the MAX1836, MAX1837

Technical Documents

User Guide 5861 EE-SIM Design and Simulation Environment User Guide
Tutorial 2031 DC to DC Buck Converter Tutorial
Reference Schematic 960 Portable Supply Derives +5V and +3.3V Power from USB Port

Tools & Models

EE-Sim: Design & Simulate MAX1837

MAX1837 SIMPLIS Schematic

Quality And Environmental

Product Reliability Reports: MAX1837.pdf

Device	Fab Process	Technology	Sample size	Rejects	FIT at 25°C	FIT at 55°C	Material Composition

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

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Related Resources

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Type	ID	Title
User Guide	5861	EE-SIM Design and Simulation Environment User Guide
Tutorial	2031	DC to DC Buck Converter Tutorial
Reference Schematic	960	Portable Supply Derives +5V and +3.3V Power from USB Port

Technical Docs

Reference Designs

Type	ID	Title
Reference Circuit	960	Portable Supply Derives +5V and +3.3V Power from USB Port
Evaluation Board	2515	MAX1837EVKIT Evaluation Kit for the MAX1836, MAX1837