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.