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參數(shù)資料
| 型號： | SC627EVB |
| 廠商： | Semtech Corporation |
| 英文描述： | LED Light Management Unit Charge Pump, 4 LEDs, 700mA Flash LED, Dual LDOs, and SemWireTM Interface |
| 中文描述： | LED燈管理股電荷泵，4個LED，700mA的閃光LED，雙LDO，和SemWireTM接口 |
| 文件頁數(shù)： | 1/23頁 |
| 文件大?。?/td> | 371K |
| 代理商： | SC627EVB |
POWER MANAGEMENT
1
SC627
LED Light Management Unit
Charge Pump, 4 LEDs, 700mA 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
Four programmable current sinks with 32 steps from
0.5mA to 25mA
Flash LED — 700mA 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
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 SC627 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 SC627 also
provides two low-dropout, low-noise linear regulators for
powering a camera module or other peripheral circuits.
The SC627 uses the proprietary SemWire
TM
single wire
interface. The interface controls all functions of the
device, including backlight and flash currents as well as
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.
SC627
VIN
SWIF
FLEN
BYP
AGND
PGND
VOUT
BL1
BL2
BL3
BL4
FL
FLASH
C
IN
2.2
μ
F
MAIN BACKLIGHT
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-
US Patents: 6,504,422; 6,794,926
Typical Application Circuit
June 27, 2007
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PDF描述 |
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| SC627ULTRT | LED Light Management Unit Charge Pump, 4 LEDs, 700mA Flash LED, Dual LDOs, and SemWireTM Interface |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC627ULTRT | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump, 4 LEDs, 700mA Flash LED, Dual LDOs, and SemWireTM Interface |
| SC628 | 功能描述:音頻指示器及警報器 MED CONTINUOUS 6-28V RoHS:否 制造商:PUI Audio 產(chǎn)品:Indicators 聲壓級:85 dB 音調(diào):Continuous 頻率:2300 Hz +/- 300 Hz 電壓額定值:5 VDC 電流額定值:30 mA 端接類型: 直徑:12 mm 安裝:Through Hole |
| SC6-28 | 制造商:WM BERG 功能描述: |
| SC628 | 制造商:Mallory Sonalert Products Inc 功能描述:TRANSDUCER PIEZO 2.9KHZ 80DBA 28VDC |
| SC628-4R | 制造商:Mallory Sonalert Products Inc 功能描述:TRANSDUCER, PIEZO, 2.9KHZ, 80DBA, 28VDC; Transducer Function:Alarm; Tones:Continuous; Supply Voltage Min:6V; Supply Voltage Max:28V; Operating Current Max:18mA; Sound Level SPL:80dBA; Resonant Frequency:2.9kHz; External Height:32.6mm;RoHS Compliant: Yes |
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