TPS51220A-Q1_15 Datasheet, PDF (1/51 Pages) Texas Instruments – Fixed Frequency, 99% Duty Cycle Peak Current Mode Notebook System Power Controller

TPS51220A-Q1
www.ti.com
SLUSAI2 – MARCH 2011
Fixed Frequency, 99% Duty Cycle Peak Current Mode Notebook System Power Controller
Check for Samples: TPS51220A-Q1
FEATURES
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•2 Qualified for Automotive Applications
• 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
• 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)
• Latch-Up exceeds 100mA per JESD78- Class I
• Integrated Boot Strap MOSFET Switch
• QFN-32 (RTV) Package
APPLICATIONS
• I/O Bus
• Point of Load in LCD TV, MFP
DESCRIPTION
The TPS51220A-Q1 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 TPS51220A-Q1 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 kHz to 1 MHz by a resistor, and each
channel runs 180° out-of-phase. The TPS51220A-Q1 can also synchronize to the external clock, and the
interleaving ratio can be adjusted by its duty. The TPS51220A-Q1 is available in the 32-pin 5×5/4×4 QFN
package and is specified from –40°C to 105°C.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Out-Of-Audio, D-CAP, PowerPAD are trademarks of Texas Instruments.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2011, Texas Instruments Incorporated