FEATURES
· Input Voltage Range 4.5 VDC to 8 VDC
· Output Voltage (0.8 V to 90% VIN)
· 0 A to 1.6 A Current Capability
· Fixed 1.25-MHz Switching Frequency
· Reference 0.8 V ±1%
· Internal 250 mW N-Channel MOSFET Switch
· Current Mode Control with Internal Slope
Compensation
· Internal Soft-Start
· Internal Loop Compensation
· Short Circuit Protection
· Thermal Shutdown
· High Efficiency Up to 92%
· Small 3 mm ´ 3 mm SON Package

APPLICATIONS
· Disk Drives
· Set Top Box
· Point of Load Power
· ASIC Power Supplies

DESCRIPTION
The TPS40222 is a fixed-frequency, current-mode,
non-synchronous buck converter optimized for
applications powered by a 5-V distributed source.
With internally determined operating frequency,
soft-start time, and control loop compensation, the
TPS40222 provides many features with a minimum of
external components.
The TPS40222 operates at 1.25 MHz and supports
up to 1.6-A output loads. The output voltage can be
programmed to as low as 0.8 V. The TPS40222
utilizes pulse-by-pulse current limit as well as
frequency foldback to protect the converter during a
catastrophic short circuited output condition.