1FEATURES
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 RDS(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 RDS(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.