TPS51218 51218 PWM IC

HIGHPERFORMANCE, SINGLE SYNCHRONOUS STEP-DOWN CONTROLLER FOR NOTEBOOK POWER SUPPLY.

FEATURES

• 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-CAPTM 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-CAPTM 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.