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1 Features

? Input voltage range: 2.75V to 6V

? Family of 1A, 2A, 3A, and 4A converters

? Quiescent current: 15μA typical

? Output voltage from 0.6V to 5.5V

? Output voltage accuracy ±1% (FPWM operation)

? Adjustable soft start

? Forced PWM or PWM and PFM operation

? Adjustable switching frequency of

1.8MHz to 4MHz

? Precise ENABLE input allows

– User-defined undervoltage lockout

– Exact sequencing

? 100% duty cycle mode

? Active output discharge

? Power-good output with window comparator

2 Applications

? Aircraft electrical power

? Defense radio

? Seeker front end

? In-flight entertainment

? Rail transport

Supports defense and aerospace applications:

? Controlled baseline

? One fabrication site

? One assembly and test site

? Extended product life cycle

? Product traceability

3 Description

The TPS6281x-EP is family of pin-to-pin, 1A, 2A, 3A,

and 4A synchronous step-down DC/DC converters.

All devices offer high efficiency and ease of use.

The family of devices is based on a peak current

mode control topology. Low-resistive switches allow

up to 4A continuous output current at high ambient

temperature. The switching frequency is externally

adjustable from 1.8MHz to 4MHz and can also

be synchronized to an external clock in the same

frequency range. The device can automatically enter

power save mode (PSM) at light loads to maintain

high efficiency across the whole load range. The

device provides 1% output voltage accuracy in PWM

mode which helps design a power supply with high

output voltage accuracy. The SS/TR pin allows the

user to set the start-up time or form tracking of the

output voltage to an external source, allowing external

sequencing of different supply rails and limiting the

inrush current during start-up.

The TPS6281x-EP device is available in a 2mm ×

3mm, VQFN package.