1 Features
• Operating input supply voltage range
(4.5 V to 18 V)
• Feedback reference voltage 0.6 V±1%
• Maximum continuous output current 3 A/2 A/2 A
• Adjustable clock frequency from 250 kHz to 2 MHz
• dedicated enable and soft start pins for each buck
• Automatic power-up, power-down sequence
• Pulse Skipping Mode (PSM) at Light Load
(TPS65261 only)
• Output voltage power-good indicator
• Input voltage power failure indicator
• Thermal overloading protection

2 Applications
• DTV
• Set top boxes
• Home gateway and access point networks
• Wireless routers
• Surveillance
• POS machine

3 Description
The TPS65261, TPS65261-1 is a monolithic triple
synchronous step-down (buck) converter with 3-
A/2-A/2-A output currents. A wide 4.5-V to 18-
V input supply voltage range encompasses the
most intermediate bus voltages operating off 5-
V, 9-V, 12-V or 15-V power bus. The converter,
with constant frequency peak current mode, is
designed to simplify its application while giving
designers options to optimize the system according
to targeted applications. The switching frequency of
the converters can be adjusted from 250 kHz to 2
MHz with an external resistor. The 180° out-of-phase
operation between Buck1 and Buck2, 3 (Buck2 and 3
run in phase) minimizes the input filter requirements.
The TPS65261, TPS65261-1 features an automatic
power sequence with connecting MODE pin to
V7V and configuring EN1/2/3 pins. The device also
features an open drain RESET signal to monitor
power down.
At light load, the TPS65261 automatically operates
in pulse skipping mode (PSM) and the TPS65261-1
operates in force continuous current mode (FCC).
PSM mode provides high efficiency by reducing
switching losses at light loads and FCC mode reduces
noise susceptibility and RF interference.
The device features overvoltage protection,
overcurrent and short-circuit protection and overtemperature
protection. A power-good pin asserts
when any output voltages are out of regulation.