1 Features

• 4.5-V to 24-V input voltage range

• 0.6-V to 5.5-V output voltage range

• Integrated 22-mΩ and 11-mΩ MOSFETs

• Support 7-A continuous IOUT

• 84-μA low quiescent current

• ±1 reference voltage (0.6 V) at 25°C

• ±1.5 reference voltage (0.6 V) at –40°C to 125°C

• 1-MHz switching frequency

• D-CAP3™ control mode for fast transient response

• Supports POSCAP and all MLCC output capacitor

• Adjustable soft start and internal 1-ms soft start

• Selectable PSM and Out-of-Audio™ (OOA) mode

under light load and supports on-the-fly change

• Large duty operation support

• Power-good indicator to monitor output voltage

• Latched output OV and UV protection

• Non-latched UVLO and OT protection

• Cycle-by-cycle overcurrent protection

• Built-in output discharge feature

• Small 2.00-mm × 3.00-mm HotRod™ QFN

package

• Pin-to-pin compatible with TPS51386 (24 V, 8 A)

2 Applications

• Notebook and PC computers

• Ultrabook, tablet computers

• TV and STB, point-of-load (POL)

• Distributed power systems

3 Description

The TPS51385 is a monolithic, 7-A, synchronous

buck converter with adaptive on-time D-CAP3 control

mode. Integrated low RDS(on) power MOSFETs enable

high efficiency and offer ease-of-use with minimum

external component count for space-constrained

power systems. Features include an accurate

reference voltage, fast load transient response, autoskip

mode operation for light load efficiency, OOA light

load operation with > 25-kHz switching frequency, DCAP3

control mode with good line, load regulation,

and does not require external compensation.

The TPS51385 provides complete protection OVP,

UVP, OCP, OTP and UVLO. The device is combined

power-good signal and output discharge function.

The TPS51385 supports both internal and external

soft-start time options. The device has the internal

fixed soft-start time 1 ms. If the application needs

longer soft-start time, the external SS pin can be used

to achieve longer soft-start time by connecting the

external capacitor.

The TPS51385 are available in a thermally enhanced

12-pin QFN package and are designed to operate

from –40°C to 125°C junction temperature.