Analog Devices Inc./Maxim Integrated MAX16936RATEA/V+

Overview

MAX16936RATEA/V+ from Maxim Integrated is a 2.5A, current-mode synchronous step-down DC-DC converter with integrated high-side and low-side MOSFETs, designed for automotive power supplies requiring 3.5V–36V input, 5V fixed output (±2% accuracy), 28µA quiescent current, and AEC-Q100 qualification - used in navigation head units and RF-sensitive infotainment systems.

For engineers reviewing the MAX16936RATEA/V+ datasheet, MAX16936RATEA/V+ pinout, MAX16936RATEA/V+ application, or MAX16936RATEA/V+ equivalent, key selection criteria include its 98% max duty cycle for cold-crank support, resistor-programmable 220kHz–2.2MHz switching frequency, FPWM/skip mode control via FSYNC, integrated BIAS LDO, and 180° out-of-phase SYNCOUT for cascaded supplies.

Technical Context

The MAX16936RATEA/V+ implements a current-mode control architecture with cycle-by-cycle overcurrent protection and automatic LX slew-rate adjustment (4ns at >1.1MHz, 8ns otherwise) to balance EMI and efficiency. Its dual supply inputs (SUP/SUPSW) enable robust operation during load-dump (42V) and cold-crank transients.

It features a 5V ±2% fixed-output configuration (no external feedback required), 180° phase-shifted open-drain SYNCOUT for multi-converter synchronization, and a dedicated FSYNC pin that selects between skip mode (for ultra-low IQ) and forced-PWM mode (for EMI-controlled RF power rails).

Key Specifications

Pinout & Package

MAX16936RATEA/V+ is housed in a 16-pin TSSOP-EP package with exposed thermal pad (EP), optimized for automotive PCB layouts requiring high thermal reliability and compact footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down converter applications.

Compared with MAX16938RATEA/V+, the MAX16936RATEA/V+ provides higher overvoltage protection threshold and identical functional behavior; compared with LM61480QRNXTQ1, it delivers unique FPWM/skip mode control and cascading capability via SYNCOUT - making it irreplaceable in multi-rail automotive timing-critical systems.

Availability

MAX16936RATEA/V+ is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and body control units requiring stable component supply with AEC-Q100 assurance, extended temperature operation, and long-term automotive lifecycle support.

Supply support for MAX16936RATEA/V+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets.

The MAX16936/MAX16938 product line was designed specifically for automotive power conversion - delivering high-efficiency, transient-resilient, AEC-Q100-qualified buck regulators with integrated diagnostics and synchronization features for next-generation vehicle electronics.

FAQ

What is the output voltage configuration of the MAX16936RATEA/V+?

The MAX16936RATEA/V+ is configured for fixed 5V output with ±2% accuracy. This is achieved by connecting the FB pin directly to the BIAS pin, eliminating the need for external feedback resistors. The device does not require any external components to set the output voltage, simplifying design and improving accuracy over temperature and line variations. The MAX16936RATEA/V+ is not adjustable - it is factory-configured exclusively for 5V fixed output.

Does the MAX16936RATEA/V+ support synchronization with an external clock?

Yes, the MAX16936RATEA/V+ supports external clock synchronization via the FSYNC pin. When an external clock signal (1.8MHz–2.6MHz, 100ns minimum pulse width) is applied to FSYNC, the device locks to that frequency within one cycle. During synchronization, the internal spread-spectrum modulation is disabled, but any modulation present on the external clock passes through to SYNCOUT. This makes the MAX16936RATEA/V+ suitable for systems requiring deterministic switching timing, such as RF transceiver power supplies.

How does the MAX16936RATEA/V+ handle cold-crank conditions?

The MAX16936RATEA/V+ handles cold-crank conditions using a 98% maximum duty cycle and dual-supply architecture (SUP/SUPSW). When input voltage drops below the regulated output (e.g., to 3.5V), the controller extends on-time to maintain regulation. Its ability to operate down to 3.5V input while delivering full 2.5A output - combined with 28µA quiescent current - ensures uninterrupted power to critical systems during engine start-up. The device remains fully functional without brown-out reset or dropout.

What is the purpose of the SYNCOUT pin on the MAX16936RATEA/V+?

The SYNCOUT pin on the MAX16936RATEA/V+ provides an open-drain 180° out-of-phase clock signal relative to the internal oscillator. It is used to synchronize multiple MAX16936RATEA/V+ devices in interleaved configurations, reducing input/output ripple and enabling higher total output current. A pull-up resistor (100Ω–1kΩ) to OUT sets the output level. Unlike generic clock outputs, SYNCOUT's precise phase relationship is factory-trimmed and maintained across temperature and supply variations - critical for stable multi-phase operation.

Is the MAX16936RATEA/V+ qualified for automotive applications?

Yes, the MAX16936RATEA/V+ is AEC-Q100 qualified for Grade 1 (-40°C to +125°C ambient) operation. It includes automotive-specific protections: 42V load-dump tolerance, cold-crank support down to 3.5V, thermal shutdown with automatic recovery, and robust ESD performance. All electrical parameters are specified across the full automotive temperature range, and the TSSOP-EP package is qualified for under-hood and dashboard mounting. The MAX16936RATEA/V+ meets ISO 7637-2 and ISO 16750-2 stress test requirements.