Analog Devices Inc./Maxim Integrated MAX16903RAUE33/V+T

Overview

The MAX16903RAUE33/V+T from Maxim Integrated is a synchronous buck DC-DC converter IC with integrated high-side and low-side MOSFETs, delivering 1A output at fixed 3.3V with input voltage range +3.5V to +28V, 25µA quiescent current in skip mode, and operation over -40°C to +125°C for automotive power rails.

For engineers reviewing the MAX16903RAUE33/V+T datasheet, MAX16903RAUE33/V+T pinout, MAX16903RAUE33/V+T application, or MAX16903RAUE33/V+T equivalent, this page provides verified electrical parameters, thermal performance data, package-specific layout guidance, and validated alternative options for AEC-Q100-compliant 3.3V automotive buck conversion.

Technical Context

The MAX16903RAUE33/V+T implements current-mode control with internal soft-start (8ms typical), undervoltage lockout (3.0V threshold), and thermal shutdown at 175°C with 15°C hysteresis. It supports three operating modes via SYNC pin: skip mode (25µA IQ), forced fixed-frequency PWM (2.1MHz), and external clock synchronization (1.8–2.6MHz).

It features integrated high-side (400–800mΩ R_DS(ON)) and low-side (250–450mΩ) DMOS FETs, PGOOD open-drain monitoring with 91–94% falling threshold, and spread-spectrum option disabled per ordering code RAUE (non-SS variant in 16-pin TSSOP-EP).

Key Specifications

Pinout & Package

MAX16903RAUE33/V+T uses the 16-pin TSSOP-EP package with exposed thermal pad (EP). Both SUP pins (14,15) and both PGND pins (10,11) must be connected together. EP must be soldered to PGND plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Compared with MAX16903RAUE33/V+T, the MAX16903RATB33/V+ offers identical electrical specs in a smaller footprint but trades 2.7°C/W higher thermal resistance, while the TPS62130ARGTR delivers higher current and lower IQ but omits AEC-Q100 validation and automotive transient protection-making it unsuitable for vehicle deployment.

Availability

MAX16903RAUE33/V+T is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial CAN node power supplies requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle continuity.

Supply support for MAX16903RAUE33/V+T 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 precision analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets.

The MAX16903 product line delivers high-voltage, low-quiescent-current buck converters optimized for automotive power rails-specifically targeting cold-crank resilience, AEC-Q100 reliability, and compact layout in space- and thermal-constrained ECUs.

FAQ

What is the output voltage tolerance of the MAX16903RAUE33/V+T over temperature and load?

The MAX16903RAUE33/V+T delivers 3.3V output with ±2.5% accuracy across -40°C to +125°C ambient temperature and 0–1A load, as specified in the Electrical Characteristics table for fixed-frequency operation. In skip mode, tolerance widens to ±4% under same conditions, reflecting trade-off between efficiency and regulation tightness.

Does the MAX16903RAUE33/V+T include spread-spectrum frequency modulation?

No, the MAX16903RAUE33/V+T does not include spread-spectrum modulation. The "RA" prefix in the ordering code indicates the standard (non-spread-spectrum) version; spread-spectrum variants use "SA" prefix (e.g., MAX16903SAUE33/V+T).

What is the recommended input capacitor for the MAX16903RAUE33/V+T?

The MAX16903RAUE33/V+T requires a minimum 4.7µF ceramic capacitor placed directly between SUP pins (14,15) and PGND pins (5,6). For systems with high input ripple or cold-crank transients, additional bulk capacitance (e.g., 10–22µF) is advised to prevent UVLO triggering below 3.5V.

How does the PGOOD signal behave on the MAX16903RAUE33/V+T?

The MAX16903RAUE33/V+T's PGOOD pin is an open-drain output that pulls low when V_OUT falls below 91% of nominal (3.003V), remains high-impedance above 93% (3.069V), and debounces with 10µs delay. A 20kΩ pull-up resistor to BIAS or external 3.3V/5V rail is required for proper logic-level signaling.

Can the MAX16903RAUE33/V+T operate during automotive cold-crank conditions?

Yes, the MAX16903RAUE33/V+T supports cold-crank operation down to 3.5V input with 97% maximum duty cycle, enabling regulation even when battery voltage dips to ~3.8V at the IC input (accounting for trace drop). Its 42V transient tolerance also protects against load-dump spikes.