DESCRIPTION

The MPQ8873 is a 36V, monolithic,

synchronous buck-boost DC/DC converter. Its

wide 2.2V to 36V input voltage range makes the

device well-suited to multi-purpose automotive

and industrial applications. Proprietary

constant-on-time (COT) control and a fully

integrated, four-switch configuration allow the

chip to flexibly change the converter topology

between buck, boost, and buck-boost mode.

This optimizes performance and efficiency at

input voltages above, below, or equal to the

output voltage. It also ensures seamless

transitions between the adjacent operational

regions.

The MPQ8873 is controlled via a standard I

2C

interface. The various parameters can be

adjusted by writing the settings in the device,

meaning that no hardware changes are

required.

The switching frequency can be configured

between 200kHz and 1MHz, or it can be

synchronized between 250kHz and 1MHz via

an external clock signal. In addition, the

configurable frequency spread spectrum

function can dither the switching frequency

periodically for improved EMI performance.

Robust fault protections include input undervoltage lockout (UVLO), input over-voltage

protection (OVP), cycle-by-cycle peak current

limiting, output OVP, output short-circuit

protection (SCP), and thermal shutdown. The

built-in power good function can indicate

whether the output voltage is regulated

properly.

The MPQ8873 is available in a thermally

enhanced QFN-34 (4mmx5mm) package.

FEATURES

 2.2V to 36V Wide Input Voltage Range

 Up to 3A Continuous Output Current

 <25μA Shutdown Current

 180μA Quiescent Current when VIN = 12V

 Single-Channel, Four-Switch, Synchronous

Buck-Boost Configuration:

o Internal 10mΩ Buck High-Side Power

MOSFET

o Internal 25mΩ Buck Low-Side

Synchronous Rectifier

o Internal 10mΩ Boost Low-Side Power

MOSFET

o Internal 25mΩ Boost High-Side

Synchronous Rectifier

 Proprietary Constant-On-Time (COT)

Control for Seamless Transitions

 Internal Soft Start

 Smart Power Good Output

 Easy-to-Optimize Efficiency and EMI

Performance:

o Configurable 200kHz to 1MHz Switching

Frequency

o Synchronizable Switching Frequency

from 250kHz to 1MHz

o Switching Frequency Spread Spectrum

o Configurable Switching Speed

 Protection Features:

o Cycle-by-Cycle Current Limiting

o Over-Current Protection (OCP)

o Configurable Input Under-Voltage

Lockout (UVLO)

o Output Over-Voltage Protection (OVP)

o Input Over-Voltage Protection (OVP)

o Output Short-Circuit Protection (SCP)

o Over-Temperature Shutdown