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SC621

Semtech Corporation
Part Number SC621
Manufacturer Semtech Corporation
Description LED Light Management Unit
Published Dec 22, 2009
Detailed Description POWER MANAGEMENT SC621 LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, Dual LDOs, and SemWireTM Interfa...
Datasheet PDF File SC621 PDF File

SC621
SC621

Overview
POWER MANAGEMENT SC621 LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, Dual LDOs, and SemWireTM Interface Features Description „ 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 — 400mA max in flash mode, 250mA max continuous for spotlight „ Two programmable 200mA low-noise LDO regulators „ Charge pump frequency — 250kHz „ SemWireTM 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 = 100μA Q „ Low shutdown current — 0.
1μA (typical) „ Ultra-thin package — 3mm x 3mm x 0.
6mm „ Lead-free and halogen-free „ WEEE and RoHS compliant Applications „ Cellular phone backlighting and flash „ PDA backlighting and flash „ Camera I/O and core power The SC621 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.
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 SC621 also provides two low-dropout, low-noise linear regulators for powering a camera module or other peripheral circuits.
The SC621 uses the proprietary SemWireTM single wire interface.
The interface controls all functions of the device, including backlight and flash currents as well as two LDO voltag...


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