TPS51217
www.ti.com SLUS947B – JUNE 2009 – REVISED APRIL 2012 HIGH PERFORMANCE, SINGLE SYNCHRONOUS STEP-DOWN
CONTROLLER FOR NOTEBOOK POWER SUPPLY
Check for Samples: TPS51217 FEATURES DESCRIPTION The TPS51217 is a small-sized single buck controller
with adaptive on-time D-CAPв„ў mode. The device is
suitable for low output voltage, high current, PC
system power rail and similar point-of-load (POL)
power supply in digital consumer products. A small
package with minimal pin-count saves space on the
PCB, while a dedicated EN pin and pre-set frequency
minimize design effort required for new designs. The
skip-mode at light load condition, strong gate drivers
and low-side FET RDS(on) current sensing supports
low-loss and high efficiency, over a broad load range.
The TRAN pin provides freedom of masking
overvoltage protection, undervoltage protection and
power-good signal during the transition period of
dynamic output voltage change for modern GPU
power supply applications. The conversion input
voltage which is the high-side FET drain voltage
ranges from 3 V to 28 V and the output voltage
ranges from 0.6 V to 2.6 V. The device requires an
external 5-V supply. The TPS51217 is available in a …
