TPS51218_16 Datasheet, PDF (1/27 Pages) Texas Instruments – HIGH PERFORMANCE, SINGLE SYNCHRONOUS STEP-DOWN CONTROLLER FOR NOTEBOOK POWER SUPPLY

TPS51218
www.ti.com
SLUS935B – MAY 2009 – REVISED FEBRUARY 2012
HIGH PERFORMANCE, SINGLE SYNCHRONOUS STEP-DOWN
CONTROLLER FOR NOTEBOOK POWER SUPPLY
Check for Samples: TPS51218
FEATURES
1
•2 Wide Input Voltage Range: 3 V to 28 V
• Output Voltage Range: 0.7 V to 2.6 V
• Wide Output Load Range: 0 to 20A+
• Built-in 0.5% 0.7 V Reference
• D-CAP™ Mode with 100-ns Load Step
Response
• Adaptive On Time Control Architecture With 4
Selectable Frequency Setting
• 4700 ppm/°C R_DS(on) Current Sensing
• Internal 1-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 TPS51218 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
selections 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 conversion input voltage which is the
high-side FET drain voltage ranges from 3 V to 28 V
and the output voltage ranges from 0.7 V to 2.6 V.
The device requires an external 5-V supply. The
TPS51218 is available in a 10-pin SON package
specified from –40°C to 85°C.
TYPICAL APPLICATION CIRCUIT
V5IN
V_IN
TPS51218
1 PGOOD VBST 10
2 TRIP
DRVH 9
EN
3 EN
SW 8
4 VFB
V5IN 7
5 RF
DRVL 6
GND
V_OUT
V_OUT_GND
UDG-09064
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 © 2009–2012, Texas Instruments Incorporated