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SGM3140 の電気的特性と機能

SGM3140のメーカーはShengbang Microelectronicsです、この部品の機能は「500mA Buck/Boost Charge Pump LED Driver」です。


製品の詳細 ( Datasheet PDF )

部品番号 SGM3140
部品説明 500mA Buck/Boost Charge Pump LED Driver
メーカ Shengbang Microelectronics
ロゴ Shengbang Microelectronics ロゴ 




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SGM3140 Datasheet, SGM3140 PDF,ピン配置, 機能
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 -40to +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
10
VOUT
2 C1
9
PGND
SGM3140
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. 2

1 Page





SGM3140 pdf, ピン配列
SGM3140
PIN CONFIGURATION (TOP VIEW)
500mA Buck/Boost
Charge Pump LED Driver
VIN 1
C1 2
C2 3
FLASH 4
EN 5
GND
10 VOUT
9 PGND
8 SGND
7 FB
6 RSET
TDFN-3×3-10L
PIN DESCRIPTION
PIN
1
2
3
4
5
6
7
8
9
10
Exposed
Pad
NAME
VIN
C1
C2
FLASH
EN
RSET
FB
SGND
PGND
VOUT
GND
FUNCTION
Input Voltage for the Charge Pump. Decouple with 4.7μF or 10μF ceramic capacitor close
to the pins of the IC.
Positive Input for the External Flying Capacitor. Connect a ceramic 1μF capacitor close to
the pins of the IC.
Negative Input for the External Flying Capacitor. Connect a ceramic 1μF capacitor close to
the pins of the IC.
Logic Input to Toggle Operation between Flash and Torch Mode. In Torch mode FB is
regulated to the internal 47mV reference. In Flash mode FB reference voltage can be
adjusted by changing the resistor from RSET pin to ground. Choose the external current
sense resistor (RSENSE) based on desired current in Torch mode and Flash mode.
Shutdown Control Input. Connect to VIN for normal operation. Connect to ground for
shutdown. For normal operation, suggest to connect to VIN only after the VIN has settled if
the VIN ramping up is slow.
RSET Pin. Connect a resistor from this pin to ground. When in Flash mode (FLASH =
High) this resistor sets the current regulation point according to the following:
VFB = (1.26V/RSET) × 10.2k.
Feedback Input for the Current Control Loop. Connect directly to the current sense
resistor.
Internal Ground Pin. Control circuitry returns current to this pin.
Power Ground Pin. Flying capacitor current returns through this pin.
Charge Pump Output Voltage. Decouple with an external capacitor. At least 1μF is
recommended. If higher value capacitor is used, output ripple is smaller.
Exposed pad should be soldered to PCB board and connected to GND.
SG Micro Corp
www.sg-micro.com
3


3Pages


SGM3140 電子部品, 半導体
SGM3140
500mA Buck/Boost
Charge Pump LED Driver
TYPICAL PERFORMANCE CHARACTERISTICS
CIN = 10μF, COUT = 4.7μF, CF = 1μF, unless otherwise noted.
Efficiency vs. Input Voltage
100
80
60
40
20 Torch 150mA VF = 2.96V Torch 200mA VF = 3.06V
Flash 300mA VF = 3.15V Flash 500mA VF = 3.33V
0
3 3.2 3.4 3.6 3.8 4 4.2
Input Voltage (V)
1200
1000
800
600
400
200
0
2.7
Battery Current vs. Input Voltage
Flash 500mA VF = 3.33V
Torch 160mA VF = 3.01V
3 3.3 3.6 3.9
Input Voltage (V)
4.2
SG Micro Corp
www.sg-micro.com
Output Current vs. Input Voltage
600
500
400
300
200
100 Torch 150mA VF = 2.96V Torch 200mA VF = 3.06V
Flash 300mA VF = 3.15V Flash 500mA VF = 3.33V
0
2.7 3 3.3 3.6 3.9 4.2
Input Voltage (V)
6

6 Page



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共有リンク

Link :


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