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SC622AEVB データシート(PDF) 1 Page - Semtech Corporation

部品番号 SC622AEVB
部品情報  LED Light Management Unit Charge Pump, 400mA Flash LED, Dual LDOs, and I2C Interface
PDF  23 Pages
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メーカー  SEMTECH [Semtech Corporation]
ホームページ  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC622AEVB データシート(HTML) 1 Page - Semtech Corporation

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POWER MANAGEMENT
1
SC622A
LED Light Management Unit
Charge Pump, 400mA Flash LED, Dual
LDOs, and I2C 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
I2C compatible interface — up to 400kHz
External flash control pin to sync with camera
Optional 1s flash time out
Automatic sleep mode (flash 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 SC622A is a high efficiency charge pump LED driver
using Semtech’s proprietary mAhXLifeTM 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 SC622A also provides two low-dropout,
low-noise linear regulators for powering a camera module
or other peripheral circuits.
The SC622A uses an I2C compatible serial interface. The
interface controls all functions of the device, including
flash current and two LDO voltage outputs. The flash/
spotlight output is triggered via either the I2C interface or
a dedicated pin.
In sleep mode, the device reduces quiescent current to
100
μA while continuing to monitor the serial interface.
The two LDOs can be enabled when the device is in sleep
mode. Total current reduces to 0.1μA in shutdown.
SC622A
VIN
SDA
FLEN
BYP
AGND
PGND
VOUT
FL
CIN
2.2μF
LDO 1
LDO 2
1
C + C1- C2+ C2-
I2C Data
Flash Control
VLDO1 = 2.5V to 3.3V
VLDO2 = 1.5V to 1.8V
Enable Control
I2C Clock
SCL
EN
VBAT
CBYP
22nF
C1
2.2μF
C2
2.2μF
COUT
4.7μF
CLDO2
1μF
CLDO1
1μF
FLASH
US Patents: 6,504,422; 6,794,926
Typical Application Circuit
July 19, 2007


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