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

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

* Automotive Instrument Cluster

* Distributed DC Power Systems

* Double battery automotive systems

* Navigation and Radio Head Units

* 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