4.5V to 36V, 6A Buck-Boost Converters

MAX26239/MAX26240

19-101750; Rev 0; 10/23

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General Description

The MAX26239/MAX26240 are small, synchronous,

buck-boost

converters

with

integrated

H-bridge

switches. These ICs provide a fixed-output regulation

voltage and an externally adjustable output voltage in

the 3V to 20V range with an input voltage above, below,

or equal to the output regulation voltage. The IC has

typical 8.2A and 10A input current-limit options and can

support continuous load currents up to 6A depending on

the

input-to-output

voltage

ratio

and

operating

frequency. It also has a wide input voltage range of 4.5V

to 36V.

The

MAX26239/MAX26240

have

two

switching

frequency options: 2.1MHz and 400kHz. The 2.1MHz

high switching frequency allows

small external

components and reduced output ripple and guarantees

no AM band interference, while the 400kHz switching

frequency offers better efficiency and relieves the power

consumption concern. The SYNC input allows three

operation modes: skip mode with ultra-low quiescent

current, forced fixed-frequency PWM operation, and

synchronization to an external clock. The IC also

includes spread-spectrum frequency modulation to

minimize EMI interference.

The MAX26239/MAX26240 feature a power-OK (POK)

indicator, undervoltage lockout, overvoltage protection,

cycle-by-cycle current limit, and thermal shutdown. The

ICs are available in a small, 4.25mm x 4.25mm x

0.75mm, 22-pin FC2QFN package.

Applications

• Point-of-Load Power Supplies

• 12V/24V Industrial Applications

• Telecom, Servers, and Networking Equipment

Benefits and Features

• Meets Stringent Quality and Reliability Requirements

• 4.5V to 36V Operating Input Voltage Range

Allows Operation in Wide Input Conditions

• Tolerates Input Transients up to 42V

• EN Pin Compatible up to 42V

• 8.2A/10A Typical Input Current Limit

• Fixed and Adjustable Output Voltage Options

• -40°C to +125°C Temperature Range

• High Integration and Thermally Enhanced Package

Reduces BOM Cost and Board Space

• Integrated FETs H-Bridge Architecture

• 2.1MHz/400kHz Switching Frequency Options

• Phase-Locked Loop (PLL) Frequency

Synchronization

• Thermally Enhanced, 22-Pin FC2QFN Package

• Low Quiescent Current Meets Stringent Current

Requirements

• 95μA Quiescent Current in Standby Mode

• 10μA Maximum Shutdown Current

• Reduced EMI Emissions at Switching Frequency

• Spread-Spectrum Function Enabled/Disabled by

SPS Pin

• Protection Features Improve System Reliability

• Supply Undervoltage Lockout and Thermal

Protection

• Output PGOOD Indicator, Overvoltage, and

Short-Circuit Protection

Ordering Information appears at end of data sheet.