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參數(shù)資料
| 型號(hào)： | SC623 |
| 廠商： | Semtech Corporation |
| 英文描述： | LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, and SemWireTM Interface |
| 中文描述： | LED燈管理股電荷泵，4個(gè)LED，400mA的閃光LED，并SemWireTM接口 |
| 文件頁數(shù)： | 1/21頁 |
| 文件大?。?/td> | 287K |
| 代理商： | SC623 |
POWER MANAGEMENT
1
SC623
LED Light Management Unit
Charge Pump, 4 LEDs, 400mA Flash LED,
and SemWire
TM
Interface
2007 Semtech Corporation
Features
Input supply voltage range — 3.0V to 5.5V
Charge pump modes — 1x, 1.5x and 2x
Four programmable current sinks with 32 steps from
0.5mA to 25mA
Flash LED — 400mA max in flash mode, 250mA max
continuous for spotlight
Charge pump frequency — 250kHz
SemWire
TM
single wire interface
—
up to 75kbit/s
Backlight current accuracy ±1.5% typical
Backlight current matching ±0.5% typical
Programmable fade-in/fade-out for main backlight
External flash control pin to sync with camera
Optional 1s flash time out
Automatic sleep mode (LEDs off)
—
I
Q
= 100μA
Low shutdown current — 0.1μA (typical)
Ultra-thin package — 3mm x 3mm x 0.6mm
Fully WEEE and RoHS compliant
Applications
Cellular phone backlighting and flash
PDA backlighting and flash
Description
The SC623 is a high efficiency charge pump LED driver
using Semtech’s proprietary mAhXLife
TM
technology.
Performance is optimized for use in single-cell Li-ion
battery applications.
The charge pump provides backlight current in
conjunction with four matched current sinks. It also can
supply continuous or bursted current to a flash LED using
the dedicated flash driver current sink. The load and
supply conditions determine whether the charge pump
operates in 1x, 1.5x, or 2x mode. An optional fading
feature that gradually adjusts the backlight current is
provided to simplify control software. A flash-timeout
feature disables the flash if active for longer than 1
second.
The SC623 uses the proprietary SemWire
TM
single wire
interface. The interface controls all functions of the device,
including backlight and flash currents. The single wire
implementation minimizes microcontroller and interface
pin counts. The flash/spotlight output is triggered via
either the SemWire interface or a dedicated pin.
In sleep mode, the device reduces quiescent current to
100
μ
A while continuing to monitor the serial interface.
Total current reduces to 0.1
μA in shutdown.
SC623
VIN
SWIF
FLEN
AGND
PGND
VOUT
BL1
BL2
BL3
BL4
FL
FLASH
C
IN
2.2
μ
F
MAIN BACKLIGHT
GREF
C1+
SemWire
Interface
Flash
Control
V
BAT
C
OUT
4.7
μ
F
C2
2.2
μ
F
C1
2.2
μ
F
C2+
C1-
C2-
US Patents: 6,504,422; 6,794,926
Typical Application Circuit
June 27, 2007
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SC623EVB | LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, and SemWireTM Interface |
| SC623ULTRT | LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, and SemWireTM Interface |
| SC624AULTRT | LED Light Management Unit Charge Pump, 4 LEDs, Dual LDOs, and I2C Interface |
| SC624A | LED Light Management Unit Charge Pump, 4 LEDs, Dual LDOs, and I2C Interface |
| SC624AEVB | LED Light Management Unit Charge Pump, 4 LEDs, Dual LDOs, and I2C Interface |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC623A | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, and I2C Interface |
| SC623AEVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, and I2C Interface |
| SC623AULTRT | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, and I2C Interface |
| SC623EVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, and SemWireTM Interface |
| SC623ULTRT | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, and SemWireTM Interface |
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