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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。 |
部品番号 | SGM3140 |
| |
部品説明 | 500mA Buck/Boost Charge Pump LED Driver | ||
メーカ | Shengbang Microelectronics | ||
ロゴ | |||
このページの下部にプレビューとSGM3140ダウンロード(pdfファイル)リンクがあります。 Total 14 pages
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℃.
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
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) × 10.2kΩ.
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
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 | |||
ページ | 合計 : 14 ページ | ||
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PDF ダウンロード | [ SGM3140 データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
SGM3140 | 500mA Buck/Boost Charge Pump LED Driver | Shengbang Microelectronics |
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