圣邦微电子

SGM3133 4-Channel Charge Pump White LED Driver with Low Dropout Current Source

GENERAL DESCRIPTION

The SGM3133 is a high efficiency and cost effective charge pump white LED driver. It supports up to 4 white LEDs and regulates a constant current for uniform intensity. The part maintains the high efficiency by utilizing a 1×/1.5× fractional charge pump and low dropout current sources. The small equivalent 1× mode open loop resistance and ultra-low dropout voltage of current source extend the operating time of 1× mode and optimize the efficiency of Li-ion battery in white LED applications.

User can easily configure each LED current from 1.25mA to 20mA by a pulse dimming control. The dimming of white LEDs current can be achieved by applying a pulse signal to the EN/SET pin. There are totally 16 steps of current could be set by users. The operating voltage range is 2.7V to 5.5V. Internal soft-start circuitry effectively reduces the in-rush current while both start-up and mode transition.

The SGM3133 is available in Green TQFN-3×3-16L package and is specified over an ambient temperature range of -40 to +85.


PIN CONFIGURATIONS


FEATURES

• Input Voltage Range: 2.7V to 5.5V
• Drives up to 4 LEDs at 20mA Each
• 16-Step Brightness Control
• High Efficiency by Fractional Conversion with
    1× and 1.5× Modes
• Automatic Charge Pump Mode Selection
• Switching Frequency: 1MHz
• 1% Typical LED Current Matching
• Internal Soft-Start Limits Inrush Current
• Low Input Noise and Low EMI
• Over-Current and Over-Temperature Protection
• Output Over-Voltage Protection
• Under-Voltage Lockout with Hysteresis
• Available in Green TQFN-3×3-16L Package

APPLICATIONS

Mobile Phone, DSC, MP3
White LED Backlighting
LCD Display Supply


ORDERING INFORMATION

Part Number Status Package Pins Pb-Free Temp Range
SGM3133YTQ16G/TR Production TQFN-3×3-16L 16 Y -40℃ to +85℃ Samples

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