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Automotive, 65V 2A/3A Mini Buck Converter

MAX25262/MAX25263

19-101221; Rev 0; 2/22

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General Description

The MAX25262/MAX25263 are small, synchronous buck

converters

with

integrated

high-side

and

low-side

switches. The device is designed to deliver up to 2A/3A

with 3.5V to 65V input voltages while using only 3.5μA

quiescent current at no load. The IC comes with a small

20ns minimum on-time capability, which enables the large

step-down conversions in a single stage without skipping

cycles. A max duty cycle of 98% and low high side FET

ON resistance enable a low dropout operation for low

input voltage applications.

The voltage quality can be monitored by observing the

PGOOD signal. The device offers two fixed 5V and 3.3V

output voltages. In addition, the device can be configured

for 1V to 20V output voltages using an external resistor-

divider. The frequency is internally fixed at 2.1MHz, which

allows for small external components, reduced output

ripple, and guarantees no AM interference. A 400kHz

option is also offered to provide the minimum switching

losses and maximum efficiency. For high light load

efficiency, the IC enters skip mode at light loads when

FSYNC is pulled low. A pin selectable forced pulse-width

modulation (PWM) mode is also available for the EMI

critical applications. The IC comes in a symmetrical flip-

chip package that offers superior EMI performance.

Further, the pin selectable spread spectrum helps to

enhance the EMI performance.

Applications

• Double Battery Automotive Systems

• Automotive Instrument Cluster

• Distributed DC Power Systems

• Navigation and Radio Head Units

Ordering Information appears at end of data sheet.

Benefits and Features

• Meets Stringent Original Equipment Manufacturer

(OEM) Module Power Consumption and Performance

Specifications

• 2A/3A Output-Current Capability

• 3.5μA Supply Current in Standby Mode

• Enables Double Battery Operation

• Wide Input Supply Range from 3.5V to 65V

• Programmable 1V to 20V Output Voltage

• Fixed 5V/3.3V/12V Options Available

• EMI Reduction Features Reduce Interference with

Sensitive Radio Bands without Sacrificing Wide Input

Voltage Range

• 20ns (typ) Minimum On-Time Guarantees Skip-

Free Operation for 3.3V Output at 2.1MHz and

24Vin

• Spread-Spectrum Option

• Phase-Locked Loop (PLL) Frequency

Synchronization

• Protection Features Improve System Reliability

• PGOOD Output and High-Voltage EN Input

Simplify Power Sequencing

• Under-voltage Lockout

• Over Temperature and Short Circuit Protection

• AEC-Q100 Qualified

Simplified Block Diagram

CIN

L

CBIAS

2.2µF

EN

LX

PGND

BST

BIAS

GND

SUP

FB

COUT

CBST

VIN

3.5V – 65V

VOUT

MAX25262/

MAX25263