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.