DESCRIPTION

The MPQ8875A is a 36V, monolithic,

synchronous buck-boost DC/DC converter. The

wide 2.2V to 36V input voltage range makes

this device well-suited for multi-purpose

automotive and industrial applications. The

proprietary constant-on-time (COT) control, as

well as the 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 with input voltages

that are above, below, or equal to the output

voltage. It also ensures seamless transitions

between the adjacent operational regions.

The MPQ8875A is controlled separately via a

standard I

2C interface. The various parameters

can be adjusted by writing the settings to the

device without any hardware changes 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 MPQ8875A is available in a thermally

enhanced QFN-34 (4mmx5mm) package.

FEATURES

 2.2V to 36V Wide Input Voltage Range

 Up to 5A 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