1 Features
• Configured for a wide range of applications
– 3.8V to 18V input voltage range
– 0.6V to 9V output voltage range
– Up to 5A continuous output current
– 0.6V ±1% reference voltage (–40°C to 125°C)
– Low quiescent current of 28uA (typical)
– 70ns, 114ns minimum switching on, off-time
– 8us maximum switching on-time
– 98% maximum duty cycle
• Ease of use and small design size
– Peak current control mode with internal
compensation
– 200kHz to 2.2MHz selectable frequency
– Synchronizable to an external clock (support
phase shift): 200kHz to 2.2MHz
– Selectable PFM / FCCM at light load condition
– Selectable adjustable soft-start time,
power-good indicator function
– Good EMI performance with frequency spread
spectrum and optimized pinout
– Hiccup overcurrent (OC) limit for both high-side
and low-side MOSFETs
– Non-latched protections for overtemperature
protection (OTP), overcurrent protection (OCP),
overvoltage protection (OVP), undervoltage
protection (UVP), and undervoltage lockout
(UVLO)
– Integrated bootstrap capacitor and inductor to
support easy PCB layout
– Operating junction temperature of –40°C to
125°C
– 3.3mm × 4.5mm × 2mm QFN package
• Create a custom design with the TPSM843521
using the WEBENCH® Power Designer

2 Applications
• Medical and healthcare
• Test and measurement
• Building automation
• Wired networking, wireless infrastructure
• Distributed power systems with 5V and 12V input

3 Description
The TPSM843521 is a high-efficiency, high-power
density, and easy-to-use, synchronous buck power
module with high design flexibility. With operating
input voltage ranging from 3.8V to 18V, the
TPSM843521 is designed for systems powered from
5V, 12V power-bus rails. The device supports up to
5A continuous output current and 98% maximum duty
cycle.
TPSM843521 uses fixed frequency peak current
control with internal compensation for fast transient
response and good line and load regulation. With
the optimized internal loop compensation, the device
eliminates the need for external compensation over a
wide output voltage range and switching frequency.