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參數資料
| 型號： | SC622ULTRT |
| 廠商： | Semtech Corporation |
| 英文描述： | LED Light Management Unit Charge Pump, 400mA Flash LED, Dual LDOs, and SemWireTM Interface |
| 中文描述： | LED燈管理股電荷泵，400mA的閃光LED，雙LDO，和SemWireTM接口 |
| 文件頁數： | 1/21頁 |
| 文件大小： | 313K |
| 代理商： | SC622ULTRT |
POWER MANAGEMENT
1
SC622
LED Light Management Unit
Charge Pump, 400mA Flash LED, Dual
LDOs, 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
Flash LED — 400mA max in flash mode, 250mA max
continuous for spotlight
Two user-configurable 100mA low-noise LDO
regulators
Charge pump frequency — 250kHz
SemWire
TM
single wire interface
—
up to 75kbit/s
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 flash
PDA flash
Camera I/O and core power
Description
The SC622 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 continuous or bursted current
to a flash LED using a dedicated flash driver current sink.
The load and supply conditions determine whether the
charge pump operates in 1x, 1.5x, or 2x mode. A flash-
timeout feature disables the flash if active for longer than
1 second. The SC622 also provides two low-dropout, low-
noise linear regulators for powering a camera module or
other peripheral circuits.
The SC622 uses the proprietary SemWire
TM
single wire
interface. The interface controls all functions of the device,
including flash current and two LDO voltage outputs. 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.
The two LDOs can be enabled when the device is in sleep
mode. Total current reduces to 0.1
μA in shutdown.
SC622
VIN
SWIF
FLEN
BYP
AGND
PGND
VOUT
FL
C
IN
2.2
μ
F
LDO1
GREF
C1+
SemWire
Interface
Flash
Control
V
LDO1
= 2.5V to 3.3V
V
LDO2
= 1.5V to 1.8V
V
BAT
C
BYP
22nF
C
OUT
4.7
μ
F
C
LDO2
1.0
μ
F
C
LDO1
1.0
μ
F
C2
2.2
μ
F
C1
2.2
μ
F
LDO2
C2+
C1-
C2-
FLASH
US Patents: 6,504,422; 6,794,926
Typical Application Circuit
July 19, 2007
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| SC623A | LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, and I2C Interface |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| SC623 | 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 |
| 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 |
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