1 Features

? AEC-Q100 qualified for automotive applications

– Grade 1: –40°C to 125°C ambient operating

temperature

– Device HBM classification level H1C

– Device CDM classification level C5

? Functional Safety-Capable

– Documentation available to aid functional safety

system design

? Input voltage range: 5.5 V to 36 V

– Operation down to 5.15 V after start-up

? Up to 5-A pulsed output current with 4% accuracy

? Adaptive on-time current control

– Low offset high-side current sense amplifier

– Stable with any combination of ceramic, and

aluminum capacitors

? Programmable switching frequency from 100 kHz

to 2.2 MHz

? Advanced dimming operation

– 1000:1 precision PWM dimming

– 15:1 precision analog dimming

? Internal maximum duty cycle limit

? Cycle-by-cycle switch overcurrent protection

? Open-drain fault indicator output

– LED short circuit, open circuit and cable

harness fault indication

? Thermal shutdown protection

2 Applications

? Driver Monitoring Systems (DMS)

? IR LED and laser driver

3 Description

The TPS92642-Q1 is a monolithic, synchronous Buck

LED driver with a wide 5.5-V to 36-V operating

input voltage range and 40-V tolerance that supports

load dump for duration of 400 ms. The TPS92642-

Q1 implements an adaptive on-time average current

mode control based on inductor valley current

detection. The adaptive on-time control provides

near constant switching frequency that can be set

between 100 kHz and 2.2 MHz. Inductor current

sensing and closed-loop feedback enables better than

±4% accuracy over wide input, output and ambient

temperature.

The high-performance infrared LED driver can

independently modulate LED current using both

analog or PWM dimming techniques. Linear analog

dimming range with over 15:1 range is obtained

by setting the IADJ voltage. PWM dimming of

LED current is achieved by directly modulating the

UDIM input pin with desired duty cycle. The device

incorporates an internal pulse monitoring circuit that

limits the maximum pulse duty cycle.

The TPS92642-Q1 incorporates advanced diagnostic

and fault protection featuring: cycle-by-cycle switch

current limit, bootstrap undervoltage, LED open, LED

short and thermal shutdown.

The TPS92642-Q1 is available in a 6.6-mm × 5.1-mm

thermally-enhanced 16-pin HTSSOP package with

0.65-mm lead pitch.