Description:
The TPS6281x-Q1 is a pin‑to‑pin compatible family of 1A, 2A, 3A, and 4A automotive synchronous DC/DC step‑down converters. All devices offer high efficiency and are easy to use. The TPS6281x‑Q1 family is based on peak current‑mode control topology. These devices are designed for automotive applications such as infotainment systems and advanced driver assistance systems (ADAS). The low‑resistance switches support continuous output currents up to 4A even at high ambient temperatures. The switching frequency can be externally adjusted from 1.8MHz to 4MHz, or synchronized to an external clock within this frequency range. In PWM/PFM mode, the TPS6281x‑Q1 automatically enters power‑save mode under light‑load conditions, maintaining high efficiency across the entire load range. The device provides 1% output voltage accuracy in PWM mode, enabling power supply designs with high output voltage precision. The SS/TR pin allows the startup time to be set or enables tracking of the output voltage to an external source. This feature enables external sequencing 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 to aid in functional safety system design
• Input voltage range: 2.75V to 6V
• 1A, 2A, 3A, and 4A family
• Quiescent current: 15µA (typical)
• Output voltage range: 0.6V to 5.5V
• Output voltage accuracy: ±1% (PWM operation)
• Adjustable soft‑start
• Forced PWM or PWM and PFM operation
• Adjustable switching frequency: 1.8MHz to 4MHz
• Precision enable input enables
– User‑defined undervoltage lockout (UVLO)
– Accurate sequencing control
• 100% duty‑cycle mode
• Active output discharge
• Spread‑spectrum clocking – optional
• Power‑good output with window comparator
• Wettable‑flank package

Applications:
• Infotainment head units
• Hybrid and reconfigurable instrument clusters
• Telematics control units
• Surround‑view ECUs, ADAS sensor fusion
• External amplifiers