TPS51217 Datasheet, PDF (1/27 Pages) Texas Instruments – HIGH PERFORMANCE, SINGLE SYNCHRONOUS STEP-DOWN CONTROLLER FOR NOTEBOOK POWER SUPPLY

TPS51217
www.ti.com ...................................................................................................................................................................................................... SLUS947 – JUNE 2009
HIGH PERFORMANCE, SINGLE SYNCHRONOUS STEP-DOWN
CONTROLLER FOR NOTEBOOK POWER SUPPLY
FEATURES
1
•2 Wide Input Voltage Range: 3 V to 28 V
• Output Voltage Range: 0.6 V to 2.6 V
• Wide Output Load Range: 0 to 20A+
• Built-in 0.5% 0.6 V Reference
• D-CAP™ Mode with 100-ns Load Step
Response
• Adaptive On Time Control Architecture with
Fixed 340kHz Operation
• Dynamic Output Voltage Change Capability
• 4700 ppm/°C R_DS(on) Current Sensing
• Internal 0.9-ms Voltage Servo Softstart
• Pre-Charged Start-up Capability
• Built-in Output Discharge
• Power Good Output
• Integrated Boost Switch
• Built-in OVP/UVP/OCP
• Thermal Shutdown (Non-latch)
• SON-10 (DSC) Package
APPLICATIONS
• Notebook Computers
• I/O Supplies
• System Power Supplies
DESCRIPTION
The TPS51217 is a small-sized single buck controller
with adaptive on-time D-CAP™ 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 R_DS(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
10-pin SON package specified from –40°C to 85°C.
TYPICAL APPLICATION CIRCUIT
V5IN
EN
VID1
VID0
TPS1217
1 PGOOD VBST 10
2 TRIP DRVH 9
3 EN
SW 8
4 VFB
V5IN 7
5 TRAN DRVL 6
GND
V_IN
V_OUT
V_OUT_GND
1
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.
D-CAP is a trademark of Texas Instruments.
2
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 © 2009, Texas Instruments Incorporated