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SGM3122 - Charge Pump White LED Driver

Description

The SGM3122 is a current-regulated white LED driver with integrated low dropout current sources and a high efficiency charge pump.

The charge pump has 1×/1.5× fractional operation mode.

The SGM3122 is designed for LCD display backlight applications.

Features

  • Input Voltage Range: 2.7V to 5.5V.
  • Support up to 4 LEDs at 30mA Each.
  • LED Brightness Control through PWM Signal.
  • 1× and 1.5× Charge Pump for High Conversion Efficiency.
  • Switching Frequency: 1MHz.
  • 0.5% Regulated Output Current Matching.
  • Built-in Soft-Start for Reducing Inrush Current.
  • Low Input Ripple and Low EMI.
  • Protection Features  Over-Current Protection  Under-Voltage Lockout  Thermal Shutdown.
  • Available in a Green TQFN-3×3-16L Package AP.

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Datasheet Details

Part number SGM3122
Manufacturer SG Micro
File Size 619.52 KB
Description Charge Pump White LED Driver
Datasheet download datasheet SGM3122 Datasheet

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Full PDF Text Transcription

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SGM3122 PWM Dimming, Charge Pump White LED Driver with Low Dropout Current Source GENERAL DESCRIPTION The SGM3122 is a current-regulated white LED driver with integrated low dropout current sources and a high efficiency charge pump. The charge pump has 1×/1.5× fractional operation mode. The SGM3122 is designed for LCD display backlight applications. The supply voltage operates from 2.7V to 5.5V and is well suited for various applications powered by a 1-cell Li-Ion battery, as well as 3-cell or 4-cell NiCd, NiMH or Alkaline batteries. The ISET reference current is set through an external resistor on the ISET pin. The SGM3122 supports up to 4 LED strings for total maximum 120mA current. In addition, the charge pump with current control reduces input current ripple and ensures low EMI.
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