1 Features

1• LP8728B-Q1 is an Automotive Grade Product that

is AECQ-100 Grade 1 Qualified

• Four High Efficiency Step-Down DC-DC

Converters:

– 93% Peak Efficiency (VIN = 5 V, VOUT = 3.3 V)

– Max Output Current 1 A

– Forced PWM Operation

– Soft-Start Control

– VOUT1 = 3.3 V

– V OUT2 = 1.2 V

– V OUT3 = 1.8 V or 2.65 V (pin selectable)

– VOUT4 = 1.5 V

• Separate Enable Inputs for each Converter

Control

• Separate Power Good Outputs for each Converter

• Output Overcurrent and Input Overvoltage

Protection

• Overtemperature Protection

• Undervoltage Lockout (UVLO)

2 Applications

• FPGA, DSP Core Power

• Processor Power for Mobile Devices

• Peripheral I/O Power

• Automotive Safety Cameras

• Automotive Infotainment

3 Description

The LP8728B-Q1 is a quad-output Power

Management Unit (PMU), optimized for low-power

FPGAs, microprocessors, and DSPs for automotive

applications. This device integrates four highly

efficient step-down DC-DC converters into one

package. Each converter has high current capability

and separate controls which allows flexibility to use

the device in multiple applications. All the converters

operate above the AM band with a fixed 3.2-MHz

switching frequency. The high-side switch turn-on

time of each converter is phase shifted to minimize

input current spikes.

Protection features include output short-circuit

protection, switch current limits, input overvoltage

protection, input undervoltage lockout, and thermal

shutdown functions. During start-up, the device

controls the output slew rate to minimize output

voltage overshoot and the input inrush current.