Analog Devices Inc./Maxim Integrated MAX16993ATJH/V+T

Overview

MAX16993ATJH/V+T from Maxim Integrated is a 2.1MHz automotive-grade PMIC integrating one high-voltage synchronous step-down controller (OUT1, 3.5–36V input, 3.3V/5.0V fixed or adjustable output) and two cascaded low-voltage synchronous buck converters (OUT2/OUT3, 0.8–3.95V, up to 3A each), all in a single 32-pin TQFN-EP package. It delivers ultra-low 30µA quiescent current and AEC-Q100 qualification for engine control units and ADAS domain controllers.

For engineers reviewing the MAX16993ATJH/V+T datasheet, MAX16993ATJH/V+T pinout, MAX16993ATJH/V+T application, or MAX16993ATJH/V+T equivalent, key selection criteria include its 36V max input with 42V load-dump tolerance, individual enable/reset per channel, spread-spectrum and SYNC capability, and -40°C to +125°C operation - critical for under-hood power rail design.

Technical Context

The MAX16993ATJH/V+T implements a current-mode architecture with forced-PWM and skip modes across all three channels. Its OUT1 controller uses an internal oscillator with pin-selectable 2.1MHz or factory-programmed lower frequencies (1.05MHz/525kHz/420kHz/350kHz), while OUT2/OUT3 operate at fixed 2.1MHz and are powered directly from OUT1's output.

Each channel features independent enable inputs (EN1/EN2/EN3), open-drain RESET_ outputs with programmable timeout (0.1–7.8ms), and overtemperature shutdown (+170°C) with thermal warning (+150°C). The BIAS LDO (5.0V ±0.4V) powers internal circuitry pre-soft-start and transitions to OUT1 post-startup.

Key Specifications

Pinout & Package

MAX16993ATJH/V+T is housed in a 32-pin TQFN-EP (5mm × 5mm × 0.75mm) with side-wettable QFND-EP variant, featuring exposed pad (EP = GND) for thermal dissipation (θ_JA = 29°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multichannel automotive DC-DC controller applications.

Compared with MAX20096ATP/V+ and TPS65321A-Q1, the MAX16993ATJH/V+T uniquely combines integrated 3A FETs on secondary rails, pin-selectable 2.1MHz operation, spread-spectrum capability, and full output adjustability - making it optimal for next-generation ADAS and domain controller designs requiring compact, low-EMI, and flexible power architecture.

Availability

MAX16993ATJH/V+T is available at Aetrix Electronics and suitable for automotive ECU, ADAS sensor fusion, and infotainment head unit designs requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MAX16993ATJH/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) is a leader in high-performance analog, mixed-signal, and power-management ICs for automotive, industrial, and communications markets.

The MAX16993 belongs to Maxim's automotive-qualified PMIC portfolio, designed specifically for compact, efficient, and robust multirail power delivery in engine control, ADAS, and body electronics - emphasizing low quiescent current, high transient immunity, and AEC-Q100 compliance.

FAQ

What is the maximum input voltage rating for MAX16993ATJH/V+T, and how does it handle automotive transients?

The MAX16993ATJH/V+T supports a continuous input voltage range of 3.5V to 36V and is protected against load-dump transients up to 42V. This is achieved through internal clamping and robust input stage design, eliminating the need for external TVS diodes in most automotive battery-connected applications. The device remains fully functional during ISO 7637-2 Pulse 5a transients, making it suitable for direct connection to vehicle battery rails in ECUs and ADAS modules.

Can MAX16993ATJH/V+T generate adjustable output voltages, and what is the supported range?

Yes, MAX16993ATJH/V+T supports adjustable outputs: OUT1 can be set from 3.0V to 5.5V using an external resistor divider (FB1 regulates to 1.0V), while OUT2 and OUT3 are adjustable from 0.8V to 3.95V. Factory-trimmed fixed options are also available (e.g., 3.3V, 5.0V, 3.15V, 1.8V). The ±3% output accuracy over line, load, and temperature is maintained without requiring 0.1% precision resistors - reducing BOM cost and calibration effort.

How does the spread-spectrum feature of MAX16993ATJH/V+T reduce EMI, and how is it enabled?

The MAX16993ATJH/V+T reduces peak radiated EMI by modulating its internal oscillator frequency ±6% around the nominal value (e.g., 2.1MHz) at a 4kHz sawtooth rate. This spreads energy across a wider bandwidth, lowering peak emissions by >10dB. It is enabled by pulling the SSEN pin high to BIAS; grounding SSEN disables spread-spectrum and restores fixed-frequency operation - allowing dynamic EMI mitigation during system validation or field deployment.

What is the purpose of the SYNC input on MAX16993ATJH/V+T, and what clock frequencies does it accept?

The SYNC input on MAX16993ATJH/V+T allows synchronization of the internal oscillator to an external clock source, reducing beat-frequency noise in multi-PMIC systems. When configured as an input (factory-set), it accepts logic-level clocks between 1.7MHz and 2.4MHz with 50% duty cycle. A logic-high on SYNC forces fixed-frequency PWM mode; a logic-low enables skip mode under light loads. This feature is essential for noise-sensitive ADAS and infotainment applications where deterministic switching is required.

Does MAX16993ATJH/V+T provide power-good signaling, and how are the RESET_ outputs configured?

Yes, MAX16993ATJH/V+T provides individual open-drain RESET_ outputs (RESET1, RESET2, RESET3) that assert low when their respective output falls below 92–98% of nominal voltage. Each remains asserted for a fixed timeout period (0.1ms to 7.8ms, factory-programmable) after regulation is restored. To use as active-high logic signals, each RESET_ must be pulled up externally to a voltage ≤5V. These outputs enable precise power sequencing and fault detection in automotive MCUs and SoCs.