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參數資料
| 型號： | SC623AULTRT |
| 廠商： | Semtech Corporation |
| 英文描述： | LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, and I2C Interface |
| 中文描述： | LED燈管理股電荷泵，4個LED，400mA的閃光LED，以及I2C接口 |
| 文件頁數： | 1/21頁 |
| 文件大小： | 292K |
| 代理商： | SC623AULTRT |
POWER MANAGEMENT
1
SC623A
LED Light Management Unit
Charge Pump, 4 LEDs, 400mA Flash LED,
and I
2
C 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
I
2
C compatible interface
—
up to 400kHz
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
Camera I/O and core power
Description
The SC623A 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 SC623A uses an I
2
C compatible serial interface. The
interface controls all functions of the device, including
backlight and flash currents. The flash/spotlight output is
triggered via either the I
2
C 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.
SC623A
VIN
SDA
FLEN
AGND
PGND
VOUT
BL
1
BL
2
BL
3
BL
4
FL
FLASH
C
IN
2.2
μ
F
MAIN BACKLIGHT
1
C +
C1-
C2+
C2-
I
2
C Data
Flash Control
Enable Control
I
2
C Clock
SCL
EN
V
BAT
C1
2.2
μ
F
C2
2.2
μ
F
C
OUT
4.7
μ
F
US Patents: 6,504,422; 6,794,926
Typical Application Circuit
June 27, 2007
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相關代理商/技術參數 |
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|---|---|
| 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 |
| SC624 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump, 4 LEDs, Dual LDOs, and SemWireTM Interface |
| SC624_09 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump, 4 LEDs, Dual LDOs,and SemWireTM Interface |
| SC624A | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump, 4 LEDs, Dual LDOs, and I2C Interface |
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