MAX1912

1.5x/2x High-Efficiency White LED Charge Pumps

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Overview

High-Efficiency 1.5x/2x Charge Pumps
Low Input Ripple with 750kHz Operation
200mV Current-Sense Threshold Reduces Power Loss
Current- or Voltage-Regulated Charge Pump
Up to 120mA Output Current
No Inductors Required
Small Ceramic Capacitors
Regulated ±5% LED Current
Load Disconnected in Shutdown
1µA Shutdown Current
Small 10-Pin µMAX Package

The MAX1910/MAX1912 power LEDs with a regulated output voltage or current (up to 120mA) from an unregulated input supply (2.7V to 5.3V). These are complete DC-DC converters requiring only four small ceramic capacitors and no inductors. Input ripple is minimized by a unique regulation scheme that maintains a fixed 750kHz switching frequency over a wide load range. Also included are logic-level shutdown and soft-start to reduce input current surges at startup.

The MAX1910 has two automatically selected operating modes: 1.5x and 2x. 1.5x mode improves efficiency at higher input voltages, while 2x mode maintains regulation at lower input voltages. The MAX1912 operates only in 1.5x mode.

The MAX1910 and the MAX1912 are available in a space-saving 10-pin µMAX package.

Applications

Backup Battery Boost Converters
Cell Phones
Digital Still Cameras
MP3 Players
PDAs
White LED Backlighting

Documentation

Data Sheet 1

MAX1910-MAX1912: 1.5x/2x High-Efficiency White LED Charge Pumps Data Sheet (Rev.2) 04/16/2004

Technical Articles 3

Driving LEDs in Battery-Operated Applications: Controlling Brightness Power Efficiently 03/03/2023

Charge-Pump and Step-Up DC-DC Converter Solutions for Powering White LEDs in Series or Parallel Connections 04/23/2002

Guide to LED Circuit Designs and LED Basics & Operation 06/15/2004

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Evaluation Kits

Evaluation Kit for the MAX1910, MAX1912

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Features and Benefits

Current-Regulated Charge Pump
60mA Output Current
No Inductor Required
750kHz Operation Minimizes Input Ripple
Uses Small Ceramic Capacitors
Load Disconnected in Shutdown
1µA Shutdown Current
Small 10-Pin µMAX® Package
Fully Assembled and Tested

Product Details

The MAX1910 evaluation kit (EV kit) is a fully assembled and tested circuit board containing a complete circuit driving four parallel white LEDs. The circuit operates from a 2.7V to 5.3V input supply. A MAX1910 comes installed on the board, but the EV kit can also be used to evaluate the MAX1912.