1FEATURES

2· Input Voltage Range: 4.5 V to 32 V

· Output Voltage Range: 1 V to 12 V

· Selectable Light Load Operation

(Continuous / Auto Skip / Out-Of-Audio™ Skip)

· Programmable Droop Compensation

· Voltage Servo Adjustable Soft Start

· 200-kHz to 1-MHz Fixed-Frequency PWM

· Current Mode Architecture

· 180° Phase Shift Between Channels

· Resistor or Inductor DCR Current Sensing

· Current Monitor Output for Each Channel

· Adaptive Zero Crossing Circuit

· Powergood Output for Each Channel

· OCL/OVP/UVP/UVLO Protections

· Thermal Shutdown (Non-Latch)

· Output Discharge Function

· Integrated Boot Strap MOSFET Switch

· QFN-32 (RTV) Package

APPLICATIONS

· Notebook Computer System and I/O Bus

· Point of Load in LCD TV, MFP

DESCRIPTION

The TPS51222 is a dual synchronous buck regulator

controller with two LDOs. It is optimized for 5-V/3.3-V system controller, enabling designers to cost

effectively complete 2-cell to 4-cell notebook system

power supply. The TPS51222 supports high

efficiency, fast transient response, and 99% duty cycle operation. It supports supply input voltage

ranging from 4.5 V to 32 V, and output voltages from

1 V to 12 V. Peak current mode supports stability

operation with lower ESR capacitor and output

accuracy. The high duty cycle (99%) operation and

the wide input/output voltage range supports flexible

design for small mobile PCs and a wide variety of

other applications. The fixed frequency can be

adjusted from 200 kHz to 1 MHz by a resistor, and each channel runs 180° out-of-phase. The TPS51222

can also synchronize to the external clock, and the

interleaving ratio can be adjusted by its duty. The

TPS51222 is available in the 32-pin 5 × 5 QFN

package and is specified from –40°C to 85°C.