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SGM3140B

Description
Charge Pump LED Driver
File Size423KB,14 Pages
ManufacturerSG Micro Corp(SGMICRO)
Websitehttp://www.sg-micro.com/
Shengbang Microelectronics is a semiconductor company that focuses on the research and development and sales of high-performance, high-quality analog integrated circuits. Shengbang Microelectronics products have excellent performance and quality and can be widely used in many fields such as mobile phones, TVs, DVDs, digital cameras, laptops, consumer electronics, automotive electronics, industrial automation control, medical instruments, LCD displays, etc.
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SGM3140B Overview

Charge Pump LED Driver

SGM3140B Preview

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SGM3140B
500mA Buck/Boost
Charge Pump LED Driver
GENERAL DESCRIPTION
The SGM3140B 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 SGM3140B 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 SGM3140B 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 SGM3140B is available in Green TDFN-3×3-10L
package and is specified over an ambient temperature
range of -40℃ to +85℃.
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
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
TYPICAL APPLICATION
V
IN
2.7V to 5.5V
C
IN
4.7μF
C
F
1μF
1
VIN
C1
VOUT
10
9
C
OUT
1μF
WLED
8
7
6
R
SET
86.6kΩ
R
SENSE
0.33Ω
2
PGND
3
4
SGM3140B
C2
FLASH
EN
SGND
FB
RSET
TORCH/FLASH
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
ENABLE
5
SG Micro Corp
www.sg-micro.com
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