Analog Devices Inc./Maxim Integrated MAX16903RAUE50/V+

Overview

MAX16903RAUE50/V+ from Maxim Integrated is a synchronous buck DC-DC converter IC with integrated high-side and low-side MOSFETs, delivering 1A output at fixed 5V with ±2.5% accuracy over -40°C to +125°C. It operates from 3.5V–28V input (tolerating +42V transients), achieves 25μA quiescent current in skip mode, and runs at 2.1MHz switching frequency for compact filter design-ideal for automotive cold-crank power rails.

For engineers reviewing the MAX16903RAUE50/V+ datasheet, MAX16903RAUE50/V+ pinout, MAX16903RAUE50/V+ application, or MAX16903RAUE50/V+ equivalent, key selection criteria include AEC-Q100 qualification, 16-pin TSSOP-EP package with exposed pad, spread-spectrum disabled, and factory-trimmed 5V output-critical for automotive infotainment, ADAS camera modules, and industrial control power supplies requiring high-voltage input resilience and low-noise operation.

Technical Context

The MAX16903RAUE50/V+ implements current-mode PWM control with internal soft-start (8ms typical), undervoltage lockout (3.0V threshold), and thermal shutdown at 175°C. Its 80ns minimum on-time enables stable regulation down to 3.5V input while supporting >97% duty cycle in dropout-essential for automotive battery voltage sag during cranking.

Three SYNC-configurable operating modes are supported: skip mode (25μA IQ), forced fixed-frequency PWM (2.1MHz), and external clock synchronization (1.8–2.6MHz). The PGOOD open-drain output asserts high when VOUT exceeds 93% of nominal and debounces with 10μs delay-enabling reliable system power sequencing.

Key Specifications

Pinout & Package

MAX16903RAUE50/V+ uses a thermally enhanced 16-pin TSSOP-EP package (5mm × 4.4mm, 0.65mm pitch) with exposed pad soldered to PGND for optimal thermal performance (θJA = 38.3°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM61480QRTWRQ1 and TPS62933QDRLRQ1, the MAX16903RAUE50/V+ uniquely balances cold-crank capability (+3.5V min VIN), AEC-Q100 qualification, and minimal 16-pin TSSOP footprint-making it optimal for space-constrained 1A automotive subsystems where transient resilience is non-negotiable.

Availability

MAX16903RAUE50/V+ is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial control I/O requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.

Supply support for MAX16903RAUE50/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) designs precision analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets-with emphasis on high-reliability, AEC-Q100-qualified solutions.

The MAX16903 product line delivers high-voltage, low-quiescent-current buck converters optimized for automotive power rails subject to cold-crank, load-dump, and wide-temperature operation-targeting infotainment, body electronics, and ADAS subsystems.

FAQ

What is the output voltage tolerance of the MAX16903RAUE50/V+ over temperature and load?

The MAX16903RAUE50/V+ delivers 5.0V output with ±2.5% accuracy across full operating conditions: -40°C to +125°C junction temperature and 0–1A load current. This specification holds for both fixed-frequency and skip-mode operation, ensuring stable power delivery to sensitive automotive electronics without external trimming.

Does the MAX16903RAUE50/V+ support external frequency synchronization?

Yes, the MAX16903RAUE50/V+ supports external frequency synchronization via its SYNC pin. When driven with a clock signal between 1.8MHz and 2.6MHz, the device locks to the external source-enabling EMI reduction through frequency dithering or alignment with other system clocks. In absence of an external signal, it defaults to skip mode for lowest quiescent current.

What package type and thermal characteristics does the MAX16903RAUE50/V+ use?

The MAX16903RAUE50/V+ uses a 16-pin TSSOP-EP package (5mm × 4.4mm) with exposed thermal pad. Its junction-to-ambient thermal resistance is 38.3°C/W on a standard four-layer board, and junction-to-case is 3°C/W-enabling 1A continuous operation at +125°C ambient when the exposed pad is properly soldered to a large PGND copper plane with thermal vias.

How does the PGOOD function work on the MAX16903RAUE50/V+?

The PGOOD pin on the MAX16903RAUE50/V+ is an open-drain output that pulls low when the 5V output falls below 91% of nominal (4.55V) and goes high-impedance when VOUT exceeds 93% (4.65V). It includes 10μs internal debounce and requires an external pull-up resistor (typically 20kΩ) to BIAS or another supply-providing reliable power-rail monitoring for system reset and sequencing.

Is the MAX16903RAUE50/V+ qualified for automotive applications?

Yes, the MAX16903RAUE50/V+ is AEC-Q100 Grade 1 qualified for automotive use, operating reliably from -40°C to +125°C junction temperature. The "/V+" suffix explicitly denotes automotive qualification, including rigorous testing for temperature cycling, humidity, mechanical shock, and ESD (±2kV HBM). It meets stringent OEM requirements for infotainment, telematics, and ADAS subsystems.