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

Overview

MAX16935SAUE/V+TGE from Maxim Integrated is a 3.5A, 36V input current-mode synchronous step-down converter with integrated high-side and low-side MOSFETs, 28µA no-load quiescent current, resistor-programmable 220kHz–2.2MHz switching frequency, and fixed 5V output (±2% accuracy). It operates across automotive -40°C to +125°C and supports 98% duty cycle during cold-crank transients in vehicle infotainment power rails.

For engineers reviewing the MAX16935SAUE/V+TGE datasheet, MAX16935SAUE/V+TGE pinout, MAX16935SAUE/V+TGE application, or MAX16935SAUE/V+TGE equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade protection features (AEC-Q100, thermal shutdown, OVP), and real-world design constraints including LX slew-rate control, SYNCOUT 180° phase shift, and FSYNC-selectable skip/FPWM modes.

Technical Context

The MAX16935SAUE/V+TGE implements a current-mode control architecture with internal slope compensation, enabling stable operation with fast transient response and inherent cycle-by-cycle current limiting. Its dual-supply inputs (SUP for logic, SUPSW for switch) support wide VIN (3.5V–36V) while maintaining regulation down to 3.5V input during cold-crank events.

It integrates a 5V BIAS linear regulator (4.7–5.4V output, ±650mV UVLO hysteresis), open-drain PGOOD with 95%/92% VFB thresholds, and SYNCOUT delivering 180° out-of-phase clock for cascaded multi-phase designs. Spread-spectrum modulation (±6%) is factory-enabled in the "S" variant, reducing EMI without external components.

Key Specifications

Pinout & Package

MAX16935SAUE/V+TGE is housed in a 16-pin 5mm × 5mm TQFN-EP package with exposed thermal pad connected to PGND. The package supports high-power dissipation (θ_JA = 35°C/W) and requires solder reflow per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16935SAUE/V+TGE, the MAX16939SAUE/V+TGE offers tighter overvoltage protection for safety-critical loads, while the LM61480QRNLRQ1 trades integrated features for lower quiescent current and higher current rating-neither is pin-compatible, and both require layout revision for BIAS/SYNCOUT signal routing.

Availability

MAX16935SAUE/V+TGE is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, ADAS camera modules, and RF transceiver power supplies requiring stable component supply across extended temperature and high-reliability environments.

Supply support for MAX16935SAUE/V+TGE 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 MAX16935/MAX16939 product line was designed specifically for automotive power conversion, addressing cold-crank resilience, AEC-Q100 compliance, and EMI-sensitive RF supply needs in next-generation vehicle electronics.

FAQ

What is the exact output voltage tolerance of MAX16935SAUE/V+TGE in fixed 5V mode?

The MAX16935SAUE/V+TGE delivers 5V output with ±2% accuracy over full temperature (-40°C to +125°C) and line/load conditions. This is confirmed in the Electrical Characteristics table as V_{OUT_5V} = 4.9V to 5.1V in FPWM mode, meeting automotive ASIL-B functional safety margin requirements for non-safety-critical 5V rails.

Does MAX16935SAUE/V+TGE require an external Schottky diode, and why?

Yes, MAX16935SAUE/V+TGE requires an external Schottky diode connected from LX to AGND. Although it integrates high-side and low-side MOSFETs, the diode supports continuous conduction mode during light-load skip mode and improves efficiency at high input voltages (>25V) by reducing reverse recovery losses that would occur with the internal low-side FET alone.

How does the FSYNC pin control operating mode in MAX16935SAUE/V+TGE?

In MAX16935SAUE/V+TGE, FSYNC selects between skip mode and forced-PWM (FPWM): connecting FSYNC to AGND enables skip mode for highest light-load efficiency; connecting to BIAS or an external clock forces FPWM for constant frequency and minimal EMI variation. The device synchronizes to external clocks within ±20% frequency deviation and one-cycle lock time.

What thermal performance can be expected from MAX16935SAUE/V+TGE in a standard 4-layer PCB?

On a JEDEC 51-compliant 4-layer board, MAX16935SAUE/V+TGE in its 5mm × 5mm TQFN-EP package achieves θ_JA = 35°C/W. At 3.5A load and 14V input, junction temperature rise is ~122°C above ambient - well within the +150°C absolute max, provided the exposed pad is fully soldered to a ≥200mm² thermal copper plane tied to PGND.

Is MAX16935SAUE/V+TGE AEC-Q100 qualified, and which grade?

Yes, MAX16935SAUE/V+TGE is AEC-Q100 qualified per Grade 0 (−40°C to +150°C junction), with full characterization across −40°C to +125°C ambient. The datasheet explicitly states "operate over the −40°C to +125°C automotive temperature range" and lists AEC-Q100 qualification in the Benefits and Features section.