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.