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參數資料
| 型號： | SC624A |
| 廠商： | Semtech Corporation |
| 英文描述： | LED Light Management Unit Charge Pump, 4 LEDs, Dual LDOs, and I2C Interface |
| 中文描述： | LED燈管理股電荷泵，4個LED，雙LDO和I2C接口 |
| 文件頁數： | 1/23頁 |
| 文件大小： | 309K |
| 代理商： | SC624A |
POWER MANAGEMENT
1
SC624A
LED Light Management Unit
Charge Pump, 4 LEDs, Dual LDOs,
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
Two user-configurable 100mA low-noise LDO
regulators
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
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 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. 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 I
2
C 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
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.
SC624A
VIN
SDA
BYP
AGND
PGND
VOUT
BL
1
BL
2
BL
3
BL
4
C
IN
1
μ
F
MAIN BACKLIGHT
LDO
1
LDO
2
1
C +
C1-
C2+
C2-
I
2
C Data
V
LDO1
= 2.5V to 3.3V
V
LDO2
= 1.5V to 1.8V
Enable Control
I
2
C Clock
SCL
EN
V
BAT
C
BYP
22nF
C1
1
μ
F
C2
1
μ
F
C
OUT
2.2
μ
F
C
LDO2
1
μ
F
C
LDO1
1
μ
F
US Patents: 6,504,422; 6,794,926
Typical Application Circuit
June 27, 2007
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| SC624AEVB | LED Light Management Unit Charge Pump, 4 LEDs, Dual LDOs, and I2C Interface |
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相關代理商/技術參數 |
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| SC624A_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 I2C Interface |
| SC624AEVB | 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 |
| SC624AULTRT | 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 |
| SC624EVB | 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 |
| SC624ULTRT | 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 |
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