GENERAL DESCRIPTION
The IS32LT3175 is a single channel linear programmable current regulator capable of up to 150mA. It integrates a debounce and latch circuit on the channel enable pin (EN) to facilitate the use of a low cost momentary contact switch. The PWM pin can be interfaced to a logic level “courtesy light” signal to directly drive the LED channel. The IS32LT3175P accepts a positive polarity PWM signal while the IS32LT3175N accepts a negative polarity PWM signal.
FEATURES
● Operating voltage 5V to 42V
● Single channel current source
- Programmable current via a single external
resistor
- Configurable from 20mA to 150mA
● Momentary contact button EN input
- Input is debounced and latched
- Higher priority than PWM input
- Gamma corrected Fade In/Out algorithm
- Pull down resistors set independent fade IN and
OUT ramp time
● PWM input pin driven by external PWM source
- PWM directly drives the current source
- IS32LT3175P – Positive polarity
- IS32LT3175N – Negative polarity
● Fault Protection:
- OUT pin shorted to GND
- ISET pin shorted to GND
- Over temperature
● SOP-8-EP package
● Automotive Grade:
- IS32LT3175P – AEC-Q100
- IS32LT3175N – AEC-Q100
● Operating temperature range from -40°C ~ +125°C
APPLICATIONS
● Automotive Interior:
- Map/Dome light
- Puddle lamp in doors
- Glove box
- Vanity mirror