Analog Devices Inc./Maxim Integrated MAX16993ATJJ/V+

Overview

MAX16993ATJJ/V+ from Maxim Integrated is an AEC-Q100 qualified automotive PMIC integrating one high-voltage synchronous step-down controller (OUT1) and two low-voltage synchronous step-down converters (OUT2/OUT3), all operating up to 2.1MHz. It accepts 3.5V–36V input, delivers ≤5.0V/≤3.95V outputs with ±2.5% accuracy, consumes only 30µA quiescent current, and supports load-dump transients up to 42V - ideal for infotainment power rails in 12V/24V vehicle systems.

For engineers reviewing the MAX16993ATJJ/V+ datasheet, MAX16993ATJJ/V+ pinout, MAX16993ATJJ/V+ application, or MAX16993ATJJ/V+ equivalent, key selection considerations include its 32-pin side-wettable QFND-EP package, individual enable/reset per channel, spread-spectrum and SYNC-capable 2.1MHz operation, and cascaded OUT2/OUT3 architecture for improved efficiency in space-constrained automotive modules.

Technical Context

The MAX16993ATJJ/V+ implements a current-mode control architecture with forced-PWM and skip modes, enabling stable regulation across wide load ranges while minimizing EMI. Its OUT1 controller uses external high-side/low-side MOSFETs, while OUT2 and OUT3 integrate 3A-rated synchronous FETs and operate from OUT1's output - eliminating intermediate LDOs and reducing thermal overhead.

Frequency is pin-selectable (CSEL1) between 2.1MHz or factory-trimmed options (1.05MHz/525kHz/420kHz/350kHz); SSEN enables spread-spectrum modulation (±3% center frequency deviation at 4kHz rate); and SYNC supports external clock synchronization (1.7–2.4MHz) or skip-mode entry. All three channels feature independent EN inputs, open-drain RESET_ outputs with programmable timeout (0.1–7.8ms), and overtemperature/overcurrent protection.

Key Specifications

Pinout & Package

MAX16993ATJJ/V+ is housed in a 32-pin side-wettable QFND-EP package (5mm × 5mm × 0.8mm) with exposed pad tied to GND for enhanced thermal dissipation (θ_JA = 37°C/W). The package supports solder joint inspection and meets automotive reflow standards (260°C peak).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX20090ATPA/V+ and TPS65321A-Q1, the MAX16993ATJJ/V+ uniquely combines cascaded dual low-V converters, pin-selectable frequency, spread-spectrum enable, and programmable reset timeout - making it optimal for compact, EMI-sensitive, and highly sequenced automotive subsystems requiring minimal external components.

Availability

MAX16993ATJJ/V+ is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and body control units requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for MAX16993ATJJ/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 demanding industrial, automotive, and communications applications.

The MAX16993ATJJ/V+ belongs to Maxim's automotive-grade PMIC product line, engineered specifically for compact, high-efficiency, and EMI-robust power solutions in next-generation vehicle electronic control units.

FAQ

What is the maximum input voltage the MAX16993ATJJ/V+ can withstand during load-dump events?

The MAX16993ATJJ/V+ is protected against load-dump transients up to 42V, exceeding the ISO 7637-2 Pulse 5a requirement. This rating applies under normal operating conditions with loads up to the maximum rated output current and transient durations ≤50ns. The device maintains regulation and does not latch up during such events, ensuring reliability in 12V and 24V automotive systems where alternator load dumps occur.

Does the MAX16993ATJJ/V+ support external synchronization of all three output channels?

Yes, the MAX16993ATJJ/V+ supports external synchronization via the SYNC pin, which accepts an external clock signal between 1.7MHz and 2.4MHz. When configured as an input, SYNC synchronizes the internal oscillator of OUT1; OUT2 and OUT3 automatically follow at the same frequency and 180° phase offset. This ensures coherent switching across all channels, reducing beat frequencies and system-level EMI.

How does the cascaded architecture of OUT2 and OUT3 improve efficiency compared to independent buck converters?

The MAX16993ATJJ/V+ cascades OUT2 and OUT3 from OUT1's output, eliminating the need for separate input capacitors and reducing conduction losses associated with multiple high-side switches driving from battery. Measured data shows this architecture improves full-load efficiency by ~4–5% versus independent 12V-input bucks, particularly at medium loads (0.5–2A), due to lower effective input voltage and reduced gate-drive losses.

What is the function of the BIAS pin during and after startup of the MAX16993ATJJ/V+?

During startup, the BIAS pin delivers a regulated 5V output (4.6V–5.4V) to power internal circuitry and gate drivers. After OUT1 completes its 4ms soft-start, the internal LDO shuts down and BIAS is shorted to OUT1 - meaning BIAS voltage tracks the OUT1 output (e.g., 3.3V or 5.0V). This switchover reduces power loss and eliminates the need for an external bias supply, simplifying system design.

Can the reset timeout periods for OUT1, OUT2, and OUT3 be configured independently on the MAX16993ATJJ/V+?

Yes, the MAX16993ATJJ/V+ provides individually programmable reset timeout periods for each output channel via OTP settings referenced in the Selector Guide. Available timeouts include 0.1ms, 1.9ms, 3.9ms, and 7.8ms - selected at factory programming. These values apply identically to RESET1, RESET2, and RESET3, enabling precise alignment with downstream SoC boot timing requirements without external logic.