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SGM3124 - White LED Charge Pump Current Source

General Description

The SGM3124 is a charge pump with PWM brightness control for white LED supplies in LCD display backlight applications.

Key Features

  • Input Voltage Range: 2.7V to 5.5V.
  • Drives up to 3 LEDs at 30mA Each.
  • LED Brightness Control Through PWM Control Signal.
  • High Efficiency by Fractional Conversion with 1× and 1.5× Modes.
  • Switching Frequency: 1MHz.
  • Regulated Output Current with 0.5% Matching.
  • Internal Soft-Start Limits Inrush Current.
  • Low Input Ripple and Low EMI.
  • Over-Current and Over-Temperature Protected.
  • Under-Voltage Lockout With Hystere.

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Datasheet Details

Part number SGM3124
Manufacturer SG Micro
File Size 382.79 KB
Description White LED Charge Pump Current Source
Datasheet download datasheet SGM3124 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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SGM3124 White LED Charge Pump Current Source with PWM Brightness Control GENERAL DESCRIPTION The SGM3124 is a charge pump with PWM brightness control for white LED supplies in LCD display backlight applications. The supply voltage ranges from 2.7V to 5.5V, it is ideally suited for all applications powered by a single Li-ion battery cell or three to four NiCd, NiMH, or alkaline battery cells. The device provides a constant current for each LED, and the initial current value can be set by an external resistor. High efficiency is achieved by utilizing a 1×/1.5× fractional conversion technique in combination with very low dropout current sources. The SGM3124 is capable of driving up to three channels of LEDs at 30mA per channel from a 2.7V to 5.5V input.