1 Features

? Adjustable and synchronizable switching

frequency of 1.8MHz to 4MHz

? Two package types

– μSIL 14-pin with 2.4mm maximum height

– EMI reduced MagPack 13-pin with 2.0mm

maximum height

? Spread spectrum clocking - optional

? Selectable forced PWM or PFM/PWM operation

? Output voltage accuracy ±1% (PWM operation)

? 2.75V to 6V input voltage range

? 0.6V to 5.5V output voltage range

? Adjustable soft start or tracking

? Power-good output with window comparator

? Precise ENABLE input allows

– User-defined undervoltage lockout

– Exact sequencing

? Optimized for low EMI

– MagPack shielded package available

– Eliminated bond wires

– Optimized pinout for simple PCB layout

? 100% duty cycle

? Output discharge

? 15μA typical quiescent current

? Excellent thermal performance

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

? Create a custom design using the TPSM828303

with the WEBENCH? Power Designer

2 Applications

? Optical modules, data center interconnect

? Signal measurement, source generation,

instrumentation

? Patient monitoring and diagnostics

? Wireless infrastructure

? Ruggedized Communication: sensors, imaging,

and radar

3 Description

TPSM8281x is a family of pin-to-pin, 3A and

4A compatible, 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 support high power density requirements

for telecommunication, test and measurement, and

medical applications. Low resistance switches allow

up to 4A continuous output current at high ambient

temperatures. 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. In PFM/PWM mode, the

TPSM8281x maintains high efficiency across the

whole load range. The TPSM8281x provide 1%

output voltage accuracy in PWM mode, which enables

designing power supplies with high output voltage

accuracy. The SS/TR pin helps limiting inrush current

through a precise start-up ramp. It also supports

sequencing by tracking the output voltage to an

external source. The family is available in a 14-pin

μSIL package with nominal 3.0mm × 4.0mm footprint

and in a 13-pin MagPack package with nominal

2.5mm × 3.0mm footprint.