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SC627A

Semtech Corporation
Part Number SC627A
Manufacturer Semtech Corporation
Description LED Light Management Unit Charge Pump
Published Dec 22, 2009
Detailed Description SC627A LED Light Management Unit POWER MANAGEMENT Features „ „ „ „ „ „ „ „ „ „ „ „ „ „ „ „ Charge Pump, 4 LEDs, 700mA F...
Datasheet PDF File SC627A PDF File

SC627A
SC627A

Overview
SC627A LED Light Management Unit POWER MANAGEMENT Features „ „ „ „ „ „ „ „ „ „ „ „ „ „ „ „ Charge Pump, 4 LEDs, 700mA Flash LED, Dual LDOs, and I2C Interface Description The SC627A 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 SC627A also provides two low-dropout, low-noise linear regulators for powering a camera module or other peripheral circuits.
The SC627A uses an I2C compatible serial interface.
The interface controls all functions of the device, including backlight and flash currents as well as 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 100μA 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.
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 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 External flash control pin to sync with camera Optional 1s flash ti...


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