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SBVS080J – SEPTEMBER 2006 – REVISED NOVEMBER 2016 TPS7510x Low Dropout, Two-Bank LED Driver With PWM Brightness Control
1 Features 3 Description The TPS7510x linear low dropout (LDO) matching
LED current source is optimized for low-power
keypad and navigation pad LED backlighting
applications. The device provides a constant current
to up to four unmatched LEDs organized in two banks
of two LEDs each in a common-cathode topology.
Without an external resistor, the current source
defaults to a factory-programmable, preset current
level with В±0.5% accuracy (typical). An optional
external resistor can be used to set initial brightness
to user-programmable values with higher accuracy.
Brightness can be varied from off to full brightness by
inputting a pulse width modulation (PWM) signal on
each enable pin (ENx, where x indicates LED bank A
or B). Each bank has independent enable and
brightness control, but current matching is done to all …
