1FEATURES
23• Differential Voltage Feedback
• 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-CAP™ Mode at 300 kHz/400 kHz for Fast
Transient Response
– D-CAP2™ 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-CAP™ or D-CAP2™) 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.