MAX5951

12V/5V Input Buck PWM Controller

1MHz, 12V/5V Input Buck PWM Controller with Lossless Valley Current Sensing

Data Sheet (Rev. 0)

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Overview

8V to 16V or 5V ±10% Input-Voltage Range

Lossless Valley-Mode Current Sensing

Output Voltage Adjustable from 0.8V to 5.5V

Voltage-Mode Control

External Compensation for Maximum Flexibility

Digital Soft-Start

Sequencing or Ratiometric Tracking

Startup Synchronization

Programmable PGOOD Output

Programmable Switching Frequency from 100kHz to 1MHz

External Frequency Synchronization

SYNCIN and SYNCOUT Enable 180° Out-of-Phase Operation

Thermal Shutdown and Short-Circuit Protection

Space-Saving 5mm x 5mm, 32-Pin TQFN Package

The MAX5951 is a 12V pulse-width modulated (PWM), step-down, DC-DC controller. The device operates over the input voltage range of 8V to 16V or 5V ±10%, and provides an adjustable output from 0.8V to 5.5V. The device delivers up to 10A of load current with excellent load-and-line regulation.

The MAX5951 PWM section utilizes a voltage-mode control scheme for good noise immunity and offers external compensation, allowing for maximum flexibility with a wide selection of inductor values and capacitor types. The device operates at a fixed switching frequency that is programmable from 100kHz to 1MHz and can be synchronized to an external clock signal though the SYNCIN input. The device includes undervoltage lockout (UVLO) and digital soft-start. Protection features include lossless valley-mode current limit, hiccup-mode output short-circuit protection, and thermal shutdown.

The MAX5951 is available in a space-saving 32-pin, 5mm x 5mm thin QFN package and is specified for operation over the -40°C to +85°C extended temperature range. Refer to the MAX5950 data sheet for a pin-compatible PWM controller with hot swap.

Applications