TPS51113, TPS51163
www. ti. com . . . . SLUS864 – MAY 2009
SYNCHRONOUS BUCK CONTROLLER WITH HIGH-CURRENT GATE DRIVER
Check for Samples :TPS51113 TPS51163
FEATURES
1
• Flexible Power Rails: 5 V to 12 V • Reference: 800 mV ± 0. 8% • Voltage Mode Control • Support Pre-biased Startup • Programmable Overcurrent Protection with
Low-Side RDS(on) Current Sensing • Fixed 300-kHz (TPS51113) and 600-kHz
(TPS51163) Switching Frequency • UV/OV Protections and Power Good Indicator • Internal Soft-start • Integrated High-Current Drivers Powered by
VDD • 10-Pin 3 × 3 SON Package
APPLICATIONS
• Server and Desktop Computer Subsystem Power Supplies (MCH, IOCH, PCI, Termination)
• Distributed Power Supplies • General DC-DC Converters
DESCRIPTION
The TPS51113 and TPS51163 are cost-optimized, feature rich, single-channel synchronous-buck controllers that operates from a single 4. 5-V to 13. 2-V supply and can convert an input voltage as low as 1. 5 V.
The controller implements voltage mode control with a fixed 300-kHz (TPS51113) and 600-kHz (TPS51163) switching frequency. The overcurrent (OC) protection employs the low-side RDS(on) current sensing and has user-programmable threshold. The OC threshold is set by the resistor from LDRV_OC pin to GND. The resistor value is read when the over-current programming circuit applies 10 μA of current to the LDRV_OC pin during the calibration phase of the start-up sequence.
The TPS51113/TPS51163 also supports output pre-biased startup.
The integrated gate driver is directly powered by VDD. VDD can be connected to VIN in some applications. The strong gate drivers with low deadtime allow for the utilization of larger MOSFETs to achieve higher efficiency. An adaptive anti-cross conduction scheme is used to prevent shoot-through between the power FETs.
TYPICAL APPLICA...
TPS51113 PDF File
