STLED25 Datasheet, PDF (1/30 Pages) STMicroelectronics – 5 channels step-up white LED driver

STLED25
5 channels step-up white LED driver
Datasheet − production data
Features
■ Operating input voltage range from 2.3 V to
5.5 V
■ ± 7.5% LED current accuracy
■ Two LEDs in series per channel
■ High side current source
■ Up to 125 mA of total LED current
■ 86% efficiency at 100 mA
■ PWM dimming with automatic shutdown time
window
■ 2.5 MHz switching frequency
■ CSP 12 bumps 0.4 mm. pitch 1.4 x 1.8 mm.
Applications
■ LCD backlight with up to 10 LEDs
■ Cellular phones
■ PDAs
Description
Flip-Chip 12 bumps (1.4 x 1.8 mm.)
continue operating driver channels that are
functioning normally, while avoiding excessive
power consumption or associated thermal issues.
The control technique is able to maintain the
efficiency close to 87% at medium load and
higher than 85% at light or full load. The device
also includes soft-start control, inrush current
limit, thermal shutdown and inductor peak current
limit. The STLED25 is packaged in a 12-bump
CSP (1.4 x 1.8 mm, 0.5 mm height).
The STLED25 is a fixed frequency, high efficiency,
boost DC-DC converter with five parallel high side
current sources. It is capable of providing 125 mA
of total current with a maximum voltage of 7.5 V
on each channel. Each current source supports
single or dual LED connection. The output voltage
of the step-up converter is automatically set at
100 mV above the highest voltage required on
any driver, to guarantee proper operation of the
linear current sources. The device implements a
self-test feature to detect failure of any of the
LEDs and to disable the related channel. The
failure status is reset as soon the IC is disabled.
This mode of failure detection allows the device to
Table 1. Device summary
Order code
Package
Packaging
STLED25JR
Flip-Chip12
Tape and reel
May 2012
This is information on a product in full production.
Doc ID 022323 Rev 3
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www.st.com
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