Analog Devices Inc./Maxim Integrated MAX16935SAUE/V+GE

Overview

MAX16935SAUE/V+GE from Maxim Integrated is a 3.5A, current-mode synchronous step-down DC-DC converter with integrated high-side and low-side MOSFETs, designed for automotive power rails requiring 3.5V–36V input, 5V fixed output (±2%), 28µA no-load quiescent current, and operation up to +125°C. It supports forced-PWM (FPWM) or skip mode via FSYNC pin and delivers stable 5V at up to 3.5A for infotainment power supplies.

For engineers reviewing the MAX16935SAUE/V+GE datasheet, MAX16935SAUE/V+GE pinout, MAX16935SAUE/V+GE application, or MAX16935SAUE/V+GE equivalent, key selection criteria include AEC-Q100 qualification, 98% max duty cycle for cold-crank support, 180° out-of-phase SYNCOUT for cascaded supplies, and ±6% spread-spectrum EMI reduction in S-version variants.

Technical Context

This device implements a current-mode control architecture with resistor-programmable switching frequency (220kHz–2.2MHz), automatic LX slew-rate adjustment (4ns/8ns based on f_SW), and dual supply inputs (SUP/SUPSW) enabling robust operation during automotive load-dump (42V tolerant) and cold-crank transients. The internal 5V BIAS LDO powers control circuitry and supports external biasing of FB for fixed 5V output.

It integrates cycle-by-cycle current limiting, thermal shutdown with 15°C hysteresis, overvoltage protection (107% V_FB threshold), and an open-drain PGOOD output with 95%/92% regulation window for precise power sequencing. The 180° phase-shifted SYNCOUT enables interleaved multi-phase designs without external delay networks.

Key Specifications

Pinout & Package

MAX16935SAUE/V+GE is housed in a 16-pin, 5mm × 5mm TQFN-EP package with exposed pad connected to PGND for thermal management. Pin 1 is SYNCOUT; pin 16 is PGOOD; EP must be soldered to a large contiguous copper ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16939SAUE/V+GE, the MAX16935SAUE/V+GE provides higher OVP threshold tolerance and identical FPWM/skip flexibility, while LM61480QRNXTQ1 offers lower quiescent current but requires redesign of feedback and enable circuitry and lacks SYNCOUT functionality.

Availability

MAX16935SAUE/V+GE is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and telematics control units requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MAX16935SAUE/V+GE 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) designs high-performance analog and mixed-signal ICs for automotive, industrial, and communications markets, with emphasis on power management, interface, and sensing solutions.

The MAX16935/MAX16939 product line targets automotive DC-DC conversion with AEC-Q100 qualification, wide-input capability, and integrated features for robust operation in harsh electrical environments like engine bays and infotainment systems.

FAQ

What is the function of the FSYNC pin on the MAX16935SAUE/V+GE?

The FSYNC pin on the MAX16935SAUE/V+GE selects operating mode: connecting it to AGND enables skip mode for highest light-load efficiency, while connecting it to BIAS or an external clock forces fixed-frequency PWM (FPWM) to suppress EMI. This pin directly controls whether the internal low-side MOSFET is activated for continuous switching.

Does the MAX16935SAUE/V+GE require an external Schottky diode?

Yes, the MAX16935SAUE/V+GE requires an external Schottky diode connected between LX and AGND. Although it integrates high-side and low-side MOSFETs, the diode is necessary to support full 3.5A load current and achieve optimal efficiency-especially in FPWM mode where the internal low-side FET alone cannot handle peak currents without added conduction loss.

What is the purpose of the SYNCOUT pin on the MAX16935SAUE/V+GE?

The SYNCOUT pin on the MAX16935SAUE/V+GE provides an open-drain 180° out-of-phase clock signal relative to the internal oscillator. It enables precise interleaving of multiple MAX16935SAUE/V+GE devices to reduce input/output ripple and increase total power capacity without external phase-delay circuitry.

How does the MAX16935SAUE/V+GE support automotive cold-crank conditions?

The MAX16935SAUE/V+GE supports cold-crank by operating up to 98% duty cycle when input voltage drops below nominal levels (e.g., to 6V). Its dual-supply architecture (SUP/SUPSW) and low 28µA quiescent current ensure regulation is maintained during engine start, and its −40°C to +125°C rating guarantees functionality across full automotive ambient range.

Is the MAX16935SAUE/V+GE AEC-Q100 qualified?

Yes, the MAX16935SAUE/V+GE is AEC-Q100 qualified per Grade 1 (−40°C to +125°C), including stress testing for temperature cycling, high-temperature operating life (HTOL), and electrostatic discharge. This qualification confirms suitability for automotive powertrain, chassis, and body electronics applications.