STLA02PUR Datasheet, PDF (1/23 Pages) STMicroelectronics – White LED driver for display backlight

STLA02
White LED driver for display backlight
Features
■ Boost DC-DC converter
■ Drives up to 6 LEDs with a total current up to 20
mA
■ Output power capability up to 500 mW
■ Input voltage range 2.5 V to 18 V
■ Output current control
■ 2.3 MHz switching frequency
■ PWM input for the output current dimming with
300:1 dimming range
■ 350 mA integrated switch
■ Overvoltage protection
■ Chip overtemperature detection and protection
■ Soft-start implemented
■ Package DFN6 2 x 2 mm
DFN6 (2 x 2 mm)
on/off by the logic signal connected to the EN pin
and this pin is also dedicated for the PWM
dimming of the output current. Current mode
control of the regulation allows a fast response to
a change of the enable pin voltage level.
Applications
■ PDA and handheld devices
■ Cellular phones
■ MP3 players
Description
STLA02 is a boost converter that operates from
2.5 V to 18 V and can provide an output voltage
as high as 27 V and can drive up to 6 white LEDs
connected in series. The total output current
capability is 20 mA at an output voltage of 24 V.
The total output power capability is up to 500 mW.
The regulation is done by the internal error
amplifier which works with the feedback voltage
from the sensing resistor connected in high side
sensing configuration. The device can be turned
Table 1. Device summary
Part number
Order code
STLA02
STLA02PUR
Package
DFN6 (2 x 2 mm)
February 2011
Doc ID 010005 Rev 1
1/23
www.st.com
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