General Description

The MAX26039/MAX26040 ICs are a small, synchronous buck-boost converter family with integrated high-side and low-side switches. The MAX26040 is designed to deliver up to 1.2A with input voltages from 4.5V to 36V while using only 52μA quiescent current at no load. The ICs provide an accurate output voltage of ±2%. Voltage quality can be monitored by observing the power-good (PGOOD) signal.

The MAX26039/MAX26040 offer a fixed output voltage of 5V and a programmable range of 4.0V to 15V. See the Ordering Information table for more details. Frequency is adjustable from 220kHz to 2.2MHz, which allows for small external components and reduced output ripple. Skip mode with low quiescent current of 52μA is available in the MAX26040B and MAX26040D versions of the IC. The ICs can operate with spread-spectrum frequency modulation designed to minimize electromagnetic interference (EMI)-radiated emissions due to the modulation frequency.

The MAX26039/MAX26040 are available in a small (4mm x 4mm), 20-pin, side-wettable TQFN package and use very few external components.

Applications

•Telecom, Servers, and Networking Equipment

•12V/24V Industrial Applications

•Point-of-Load (POL) Power Supply

Benefits and Features

•High Voltage, High Efficiency, Low Power

•4.5V to 36V Supply Operation

•Tolerates Input Transients up to 40V

•EN Pin Compatible from 3.3V to 40V

•0.6A (max) Output Current (MAX26039)

•1.2A (max) Output Current (MAX26040)

•-40°C to +125°C Temperature Range

•Increased Efficiency with Reduced Bill of Materials (BOM) Cost and Board Space

•Integrated field-effect transistors (FETs) H-Bridge Architecture

•Fixed Output Voltages

•20-Pin SWTQFN Package

•Low Quiescent Current Helps Designers Meet Stringent Original Equipment Manufacturer (OEM) Current Requirements

•52μA Quiescent Current when in Standby Mode

•10μA (max) Quiescent Current in Shutdown Mode

•High Switching Frequency Allows Use of Small External Components

•200kHz to 2.2MHz Operating Frequency

•Skip Mode for Efficient Low-Power Operation

•Fixed-Frequency Pulse-Width Modulation (PWM) Mode

•External Frequency Synchronization

•Reduced EMI Emissions at the Switching Frequency

•Spread Spectrum Can be Enabled or Disabled