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MAX1912

MAX1912

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

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Overview

Description

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.
MAX1910, MAX1912: Typical Operating Circuit MAX1910, MAX1912: Typical Operating Circuit Enlarge+

Key Features

  • 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

Applications/Uses

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

Parametric Specs


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


MAX1910EVKIT: Evaluation Kit for the MAX1910, MAX1912

Technical Documents

App Note 3070 Standard and White LED Basics and Operation
Reference Schematic 1804 Driving LEDs in Battery-Operated Applications: Controlling Brightness Power Efficiently
App Note 1037 Charge-Pump and Step-Up DC-DC Converter Solutions for Powering White LEDs in Series or Parallel Connections

Quality And Environmental

Request Reliability Report for: MAX1912 
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.

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Reference Designs