TPS51220A Datasheet | Texas Instruments

FEATURES - 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 pensation - Voltage Servo Adjustable Soft Start - 200-k Hz to 1-MHz Fixed-Frequency PWM - Selectable Current/ D-CAP™ Mode Architecture - 180° Phase Shift Between Channels - Resistor or Inductor DCR Current Sensing - Adaptive Zero Crossing Circuit - Powergood Output for Each Channel - OCL/OVP/UVP/UVLO Protections (OVP Disable Option) - Thermal Shutdown (Non-Latch) - Output Discharge Function (Disable Option) - Integrated Boot Strap MOSFET Switch - QFN-32 (RTV/RSN) Package APPLICATIONS - Notebook puter System and I/O Bus - Point of Load in LCD TV, MFP DESCRIPTION The TPS51220A 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 plete 2-cell to 4-cell notebook system power supply. The TPS51220A 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. Two types of control schemes can be chosen depending on the application. Peak current mode supports stability operation with lower ESR capacitor and output accuracy. The D-CAP mode supports fast transient response. The high duty (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 k Hz to 1 MHz by a resistor, and each channel runs 180° out-of-phase. The TPS51220A can also synchronize to the external clock, and the interleaving ratio can be adjusted by its duty. The TPS51220A is available in the 32-pin 5×5/4×4 QFN package and is specified from - 40°C to 85°C. TYPICAL APPLICATION CIRCUIT VO1 5.0V VBAT L1 C11 PGND Q11 C12 PGND Q12 PGND VO1 R01 VREG5 5V/100m A C01 C14 C24 PGND...