1 Features

? 2.7-V to 6-V input voltage range

? 0.6-V to 5.5-V output voltage range

? Family of 0.5-A, 1-A and 2-A devices

? 20-μA typical quiescent current

? ±1 feedback voltage accuracy (PWM operation)

? 2.25-MHz switching frequency (PWM operation)

? 1.8-MHz to 4-MHz external synchronization

? Selectable forced PWM or PFM/PWM operation

? Adjustable soft start-up to 10 ms or tracking

? Precise ENABLE input allows

– User-defined undervoltage lockout

– Exact sequencing

? 100 duty cycle mode

? Active output discharge

? Power-good output with window comparator

? –40°C to 125°C operating temperature range

? 2.7-mm × 3.0-mm QFN package with 0.5-mm pitch

2 Applications

? Factory automation and control

? Signal measurement, source generation,

instrumentation

? Patient monitoring and diagnostics

? Wireless infrastructure

? Ruggedized Communication: sensors, imaging,

and radar

3 Description

TPSM82851x is a family of pin-to-pin compatible,

0.5-A, 1-A, and 2-A high-efficiency and easy to use

synchronous step-down DC/DC power modules with

integrated inductors. The devices are based on a

fixed-frequency peak current-mode control topology

and they can be used in telecommunication, test

and measurement, and medical applications with high

power density and ease of use requirements. Low

resistance switches allow up to 2-A continuous output

current at high ambient temperatures. The switching

frequency is internally fixed at 2.25 MHz and can

also be synchronized to an external clock in the

range from 1.8 MHz to 4 MHz. In PFM/PWM mode,

the TPSM82851x automatically enters power save

mode at light loads to maintain high efficiency across

the whole load range. The TPSM82851x provides a

1 feedback voltage accuracy in PWM mode which

helps design a power supply with high output voltage

accuracy. The SS/TR pin sets the start-up time or

tracks the output voltage to an external source. This

feature allows external sequencing of different supply

rails and limits the inrush current during start-up.