Description:

The TPS6281x-Q1 is a pin-to-pin 1A, 2A, 3A and 4A automotive-grade synchronous DC/DC step-down converter family. All devices feature high efficiency and ease of use. The TPS6281x-Q1 family is based on a peak current mode control topology. The TPS6281x-Q1 is designed for automotive applications such as infotainment systems and advanced driver assistance systems. Low-resistance switches support up to 4A continuous output current in high-temperature environments. Users can externally adjust the switching frequency from 1.8MHz to 4MHz, or synchronize it to an external clock within this frequency range. In PWM/PFM mode, the TPS6281x-Q1 automatically enters power-save mode at light loads, thereby maintaining high efficiency over the entire load range. The TPS6281x-Q1 provides 1% output voltage accuracy in PWM mode, which helps realize power supply designs with high output voltage accuracy. Through the SS/TR pin, the startup time can be set or the output voltage can be tracked to an external source. This feature enables external sequencing control of different power rails and limits inrush current during startup. The TPS6281x-Q1 is available in a 3mm × 2mm VQFN package with wettable flanks.

Features:

AEC-Q100 qualified for automotive applications – Device temperature grade 1: –40°C to +125°C, TA

Functional safety-capable – Documentation available for functional safety system design

Input voltage range: 2.75V to 6V

1A, 2A, 3A and 4A family

Quiescent current 15µA (typical)

Output voltage range from 0.6V to 5.5V

Output voltage accuracy of ±1% (PWM operation)

Adjustable soft start

Forced PWM or PWM and PFM operation

Adjustable switching frequency from 1.8MHz to 4MHz

Precision enable input enables – User-defined undervoltage lockout – Accurate sequencing control

100% duty cycle mode

Active output discharge

Spread-spectrum clocking – optional

Power good output with window comparator

Package with wettable flanks

Applications:

Infotainment head units

Hybrid and reconfigurable instrument clusters

Telematics control units

Surround-view ECUs, ADAS sensor fusion

External amplifiers