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PDF SGM3140B Data sheet ( Hoja de datos )
| Número de pieza | SGM3140B | |
| Descripción | 500mA Buck/Boost Charge Pump LED Driver | |
| Fabricantes | Shengbang Microelectronics | |
| Logotipo |  |
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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℃.
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
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
● IQ < 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
VIN
2.7V to 5.5V
CIN
4.7μF
CF
1μF
TORCH/FLASH
ENABLE
1
VIN
VOUT 10
2 C1
9
PGND
SGM3140B
3
C2
8
SGND
4
FLASH
7
FB
COUT
1μF
5 EN
6
RSET
RSET
86.6kΩ
WLED
RSENSE
0.33Ω
SG Micro Corp
www.sg-micro.com
REV. A
1 page  
SGM3140B
500mA Buck/Boost
Charge Pump LED Driver
TYPICAL PERFORMANCE CHARACTERISTICS
CIN = 10μF, COUT = 4.7μF, CF = 1μF, unless otherwise noted.
SG Micro Corp
www.sg-micro.com
5
5 Page 
SGM3140B
EVALUATION BOARD LAYOUT
500mA Buck/Boost
Charge Pump LED Driver
Printed Circuit Board Layout Recommendations
Follow the PCB layout guidelines for optimal performance:
1. Place the flying capacitor CF as close to the chip as possible; otherwise 2× mode performance will be compromised.
Also keep analog components away from this capacitor.
2. Place input and output decoupling capacitors as close to the chip as possible to reduce switching noise and output
ripple.
3. The power traces, consisting of the VIN/GND trace, the VOUT trace and the WLED trace should be kept short and
wide. Also minimize the feedback loop area (consisting of WLED/FB) small.
4. Connect the exposed pad to the GND plane to achieve the best power dissipation.
SG Micro Corp
www.sg-micro.com
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet SGM3140B.PDF ] | |
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