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 resistordivider.
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 flipchip
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

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