圣邦微电子

SGM3140 500mA Buck/Boost Charge Pump LED Driver

GENERAL DESCRIPTION

The SGM3140 is a current-regulated charge pump ideal for powering high brightness LEDs for camera flash applications. The charge pump can be set to regulate two current levels for Flash and Torch modes.

The SGM3140 automatically switches modes between step-up and step-down ensuring that LED current does not depend on the forward voltage. It switches at 2.2MHz, allowing the use of tiny components. The supply voltage ranges from 2.7V to 5.5V and 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 SGM3140 also features a very low shutdown current, an automatic soft-start mode to limit inrush current, as well as over-current, over-voltage and over-temperature thermal shutdown control. A low current-sense reference voltage (47mV) allows the use of small 0603 current sensing resistors.

The SGM3140 is available in Green TDFN-3×3-10L package and is specified over an ambient temperature range of -40 to +85.


PIN CONFIGURATIONS


FEATURES

• Output Current Up to 500mA
• Up to 90% Efficiency in Torch Mode
• Adjustable Flash Mode Current
• Automatic Buck/Boost Mode Switchover
• Input Voltage Range: 2.7V to 5.5V
• Minimum External Components: No Inductors
• High Frequency Operation: 2.2MHz
• Low 47mV Reference for Low Loss Sensing
• I
Q < 1μa in shutdown
< 1μa in shutdown
< 1μa in shutdown
< 1μa in shutdown
< shutdown
< 1μa in shutdown
< 1μa in shutdown
< 1μa in shutdown
< 1μa in shutdown
< shutdown
< shutdown
< shutdown
• Automatic Soft-Start Limits Inrush Current
• Low Input and Output Ripple and Low EMI
• Output Over-Voltage Protection
• Over-Current and Over-Temperature Protection
• Available in Green TDFN-3×3-10L Package

APPLICATIONS

White LED Torch, Flash for Cell
Phones, DSCs and Camcorders
White LED Backlighting
Generic Lighting, Flash and Strobe Applications
General Purpose High Current Boost


ORDERING INFORMATION

Part Number Status Package Pins Pb-Free Temp Range
SGM3140YD10G/TR Production TDFN-3×3-10L 10 Y -40℃ to +85℃ Samples

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