• DC Compensation for Accurate Regulation

• Wide Input Voltage Range: 3 V to 28 V

• Output Voltage Range: 0.5 V to 2.0 V with Fixed Options of 1.05 V and 1.00 V

• Wide Output Load Range: 0 A to 20 A+

• Adaptive On-Time Modulation with Selectable

  Control Architecture and Frequency

  • – D-CAPTM Mode at 300 kHz/400 kHz for Fast Transient Response

  • – D-CAP2TM Mode at 500 kHz/670 kHz for Ceramic Output Capacitor

• 4700 ppm/°C, Low-Side RDS(on) Current Sensing

• RSENSE Accurate Current Sense Option

• Internal, 1-ms Voltage Servo Softstart

• Built-In Output Discharge

• Power Good Output

• Integrated Boost Switch

• Built-In OVP/UVP/OCP

• Thermal Shutdown (Non-latched)

• 3 mm × 3 mm, 16-Pin, QFN (RTE) Package

   

APPLICATIONS

• Notebook Computers

• I/O Supplies

DESCRIPTION

The TPS51219 is a small-sized single buck controller with adaptive on-time control. It provides a choice of control modes (D-CAPTM or D-CAP2TM) to meet a wide range of system requirements. It is designed for tight DC regulation requirements such as the VCCIO application for Intel® notebooks. The performance and flexibility of the TPS51219 makes it suitable for low output voltage, high current, PC system power rails and similar point-of-load (POL) power supplies. Differential voltage feedback and the voltage compensation function combine to provide high precision power to load devices.

A small package, fixed voltage options and minimal external component count saves cost and space, while a dedicated EN pin and pre-set frequency selections minimize design effort. The skip-mode at light load condition, strong gate drivers, and low-side FET RDS(on) current sensing provides high efficiency operation over a broad load range. The external resistor current sense option enables accurate current sensing. The conversion input voltage (the high-side FET drain voltage) ranges from 3 V to 28 V and output voltage ranges from 0.5 V to 2.0 V. The device requires an external 5-V supply.

The TPS51219 is available in a 16-pin, QFN package and is specified for ambient temperature from -40°C to 85°C.