Dual-Phase Synchronous Boost Controller with Programmable Gate Drive and IC

The MAX25203 automotive dual-phase synchronous boost controller enables infotainment systems to stay in regulation during cold-crank or start-stop operation all the way down to a battery input of 1.8V. It can also be used to generate backlight voltage and Class D audio amplifier voltages. This device can start with an input voltage supply from 4.5V to 42V and can operate down to 1.8V after start-up, and has a low 5µA shutdown supply current.

The MAX25203 operates at up to 2.1MHz frequency to allow small external components and reduced output ripple, and to guarantee no AM band interference. The switching frequency is resistor adjustable (220kHz to 2100kHz) or it can be synchronized on-the-fly to an external clock.

The MAX25203 has a spread-spectrum option for frequency modulation to minimize EMI interference. A 90° out-of-phase clock output enables synchronizing a second MAX25203 for quad-phase operation.

Pass-through operation has over 98% efficiency when the supply voltage exceeds the output regulation voltage. Programmable current-limit blanking handles high peak loads without oversizing the inductor.

The MAX25203 features a power-OK monitor and undervoltage lockout. Protection features include cycle-by-cycle current limit and thermal shutdown. It operates over the -40°C to +125°C automotive temperature range.

Applications

* Automotive Audio Amplifier * Infotainment Systems

* Meets Stringent OEM Module Power Consumption and Performance Specifications

* ±1.5% Output-Voltage Accuracy at FB * Output Voltage Adjustable Between 12V and 65V (70V Abs Max) or 6V and 59V (MAX25203AATJD/MAX25203AATJE) * 5µA Shutdown Supply Current

* High Efficiency and Current Sharing

* Pass-Through for >98% Efficiency * OTP Gate Drive Voltage from 6.5V to 10V Allows User to Optimize External MOSFETs and Improve Efficiency * Current Sharing Accuracy of ±5% Between Phases to Improve System Efficiency * Programmable Current-Limit Blanking Handles High Peak Loads without Oversizing Inductor

* EMI-Reduction Features Reduce Interference with Sensitive Radio Bands without Sacrificing Wide Input Voltage Range

* Spread-Spectrum Option * On-the-Fly Frequency-Synchronization Input * Resistor-Programmable Frequency between 220kHz and 2.1MHz * Synchronization Output Provides 90° Out-of-Phase Clock for Quad-Phase Operation

* Integration and Thermally Enhanced Package Saves Board Space and Cost

* Current-Mode Controllers with Forced-Continuous and Skip Modes * Side-Wettable, 32-Pin TQFN-EP Package

* Protection Features and I2C Diagnostics for Improved System Reliability

* Supply Undervoltage Lockout * Die Temperature Monitoring through I2C * Short-Circuit Protection with True ShutdownTM * Individual Phase Current Monitoring through I2C