製品概要
概要
The STCF03 is a high efficiency power supply solution to drive a single flash LED in camera phone, PDAs and other hand-held devices. It is a buck - boost converter to guarantee a proper LED current control over all possible conditions of battery voltage and output voltage; the output current control ensure a good current regulation over the forward voltage spread characteristics of the flash LED. Thanks to the high efficiency of the converter allows having the input current taken from the battery remain under 1.5 A.
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特徴
- Buck-boost DC-DC converter
- Drives one power white LED up to 800 mA from 2.7 V to 5.5 V in QFN
- Drives one power white LED up to 800 mA from 3.3 V to 5.5 V in BGA
- Efficient up to 92%
- Output current control
- 1.8 MHz typ. fixed frequency PWM
- Synchronous rectification
- Full I²C control
- Operational modes:
- Shutdown mode
- Shutdown + NTC
- Ready mode + auxiliary red LED
- Flash mode: up to 800 mA
- Torch mode: up to 200 mA
- Soft and hard triggering of flash
- Flash and torch dimming with 16 exponential values
- Dimmable red LED indicator auxiliary output
- Internally or externally timed flash operation
- Digitally programmable safety time-out in flash mode
- LED overtemperature detection and protection with external NTC resistor
- Opened and shorted LED failure detection and protection
- Chip over temperature detection and protection
- < 1 μA shutdown current
- Packages:
- QFN20 (4 x 4)
- TFBGA25 (3 x 3)
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STマイクロエレクトロニクス - STCF03
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