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SC624AEVB Datasheet(PDF) 1 Page - Semtech Corporation

Part # SC624AEVB
Description  LED Light Management Unit Charge Pump, 4 LEDs, Dual LDOs, and I2C Interface
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC624AEVB Datasheet(HTML) 1 Page - Semtech Corporation

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POWER MANAGEMENT
1
SC624A
LED Light Management Unit
Charge Pump, 4 LEDs, 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
Four programmable current sinks with 32 steps from
0.5mA to 25mA
Two user-configurable 100mA low-noise LDO
regulators
Charge pump frequency — 250kHz
I2C 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
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
PDA backlighting
Camera I/O and core power
Description
The SC624A 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
backlight
current
in
conjunction with four matched current sinks. 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. The SC624A also
provides two low-dropout, low-noise linear regulators for
powering a camera module or other peripheral circuits.
The SC624A uses an I2C compatible serial interface. The
interface controls all functions of the device, including
backlight current and two LDO voltage outputs.
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.
SC624A
VIN
SDA
BYP
AGND
PGND
VOUT
BL 1
BL 2
BL 3
BL 4
CIN
1μF
MAIN BACKLIGHT
LDO 1
LDO 2
1
C+ C1- C2+ C2-
I2C Data
VLDO1 = 2.5V to 3.3V
VLDO2 = 1.5V to 1.8V
Enable Control
I2C Clock
SCL
EN
VBAT
CBYP
22nF
C1
1μF
C2
1μF
COUT
2.2μF
CLDO2
1μF
CLDO1
1μF
US Patents: 6,504,422; 6,794,926
Typical Application Circuit
June 27, 2007


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