STLD20CP1 Datasheet, PDF (1/19 Pages) STMicroelectronics – Power management for white LED and camera flash

STLD20CP1
Power management for white LED and camera flash
Features
■ Inductor step-up to 17 V output for 2 to 4 white
LEDs in series from 2.8 V to 6 V supply
■ Charge pump 2X, 1X output for 1 power
flash/torch WLED
■ Control pins to select shutdown mode
■ Single-wire pulse dimming control for white
LED
■ External resistor to set max current up to 300
mA in flash mode
■ External resistor to set max current up to 100
mA in torch mode
■ Logic input to select flash/strobe or movie/torch
mode
■ Soft start limits inrush current
■ Internally limited inductor peak current
■ Over-voltage and over-temperature protection.
■ Package: QFN16 (3x3 mm)
■ Temperature range: -40 °C to 85 °C
Description
The STLD20CP1 is a power management device
for the supply of white LED TFT backlighting
MAIN/SUB display and camera flash. It is a 1.3
MHz PWM step-up switching regulator and 2X
and 1X charge pump. The current feedback
control of the step-up provides excellent line
transient response, making it particularly
QFN16 (3x3 mm)
suitable for battery-powered applications. It is
possible to select the value of the current flowing
through the power white LED using two external
resistors to choose the current value in torch
mode or flash mode. Single-wire pulse dimming
control and shutdown of the white LEDs for
backlighting is obtained through two digital control
pins: DM1 and DM2. The flash is driven by two
logic pins: TF, to enable the flash function, and
SEL to select torch or flash mode. Other features
include over-voltage and over-temperature
protection, and inductor current limitation. The
high efficiency of the STLD20CP1 makes it
suitable for hand-held instruments and
particularly ideal in mobile phones. The
STLD20CP1 is available in a small, thin low-
profile QFN16 (3x3 mm) package.
Table 1. Device summary
Order code
STLD20CP1PQR
November 2007
Package
QFN16 (3x3 mm)
Rev 2
Packaging
Tape and reel
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