STP4CMPQTR Datasheet, PDF (1/22 Pages) STMicroelectronics – Low voltage 4-channel constant current LED driver with charge pump

STP4CMP
Low voltage 4-channel constant current
LED driver with charge pump
Features
■ Operating voltage range: V_CC (opr) = 2.7 V to
5.5 V
■ Full RGB function support
■ 4-channel LED driver with individual ON/OFF
control directly from input pins
■ Individual programmable output current for the
4 channels through 4 external resistors with a
max. capability of 30 mA
■ Absolute output current accuracy of max. ±7%
and channel-to-channel mismatch of max. ±
4%
■ Selectable charge pump enable/disable
■ Thermal protection
■ Small QFN20 (1.8 x 3.2 mm) package
Applications
■ Mobile phone display backlighting
■ RGB LED indicator drivers
QFN20
(1.8 x 3.2 mm)
provide brightness control. When enabled, the
charge pump, which uses a small ceramic bucket
capacitor between C1P and C1N, operates to
regulate the V_OUT with a clamping voltage at typ.
5 V. The tiny QFN20 (1.8 x 3.2 mm) package
allows the device to be also used for applications
with space limitation.
Description
The STP4CMP is a charge pump based 4-
channel LED driver designed for RGB illumination
or LCD display backlighting. The STP4CMP
works off a battery with an input voltage between
2.7 V - 5.5 V. The device generates regulated
current sinks with high absolute and channel-to-
channel accuracy to drive up to 4 LEDs. It can
support LEDs with forward voltage as high as 3.8
V. The current sink for each channel can be set
with 4 individual external resistors. Each channel
is controlled independently. The PWM control can
be applied directly to the 4 EN (enable) pins to
Table 1. Device summary
Order code
Package
STP4CMPQTR
QFN20
Packaging
Tape and reel
January 2012
Doc ID 15770 Rev 2
1/22
www.st.com
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