Analog Devices Inc./Maxim Integrated MAX16904SATB80/V+T

Overview

The MAX16904SATB80/V+T from Maxim Integrated is a synchronous buck DC-DC converter delivering 600mA output with fixed 8.0V output voltage, +3.5V to +28V input range, 2.1MHz switching frequency, and 25μA quiescent current in SKIP mode-designed for automotive power rails requiring high-voltage tolerance and AEC-Q100 compliance.

For engineers reviewing the MAX16904SATB80/V+T datasheet, MAX16904SATB80/V+T pinout, MAX16904SATB80/V+T application, or MAX16904SATB80/V+T equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade thermal and EMI performance, and real-world design implications of spread-spectrum operation, dropout capability, and PGOOD monitoring.

Technical Context

The MAX16904SATB80/V+T implements current-mode control with integrated high-side (400–800mΩ R_DS(ON)) and low-side (250–450mΩ) DMOS switches, enabling 97% duty-cycle dropout operation and internal soft-start (8ms typical). It uses a 1.2V feedback reference and supports three SYNC-configurable modes: SKIP (25μA I_Q), forced fixed-frequency PWM, and external clock synchronization.

Its spread-spectrum option modulates frequency by +6% around 2.1MHz (typ), ensuring no AM-band interference while maintaining >93% PGOOD assertion threshold and thermal shutdown at 175°C with 15°C hysteresis-critical for under-hood automotive environments operating from −40°C to +125°C.

Key Specifications

Pinout & Package

MAX16904SATB80/V+T is housed in a thermally enhanced 10-pin TDFN-EP package (3mm × 3mm × 0.75mm) with exposed pad soldered to PGND for low θ_JA = 41°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM61480RQWR and TPS62933RTER, the MAX16904SATB80/V+T uniquely combines AEC-Q100 qualification, +42V transient tolerance, spread-spectrum EMI reduction, and factory-trimmed 8.0V output-making it the only drop-in solution for automotive 8V rail generation with full cold-crank and load-dump resilience.

Availability

MAX16904SATB80/V+T is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and body control unit designs requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle assurance.

Supply support for MAX16904SATB80/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 demanding industrial, automotive, and communications applications.

The MAX16904SATB80/V+T belongs to Maxim's automotive-grade mini-buck converter family, engineered specifically for high-input-voltage DC-DC conversion in space-constrained, thermally aggressive vehicle subsystems.

FAQ

What is the output voltage tolerance of the MAX16904SATB80/V+T under full temperature and load conditions?

The MAX16904SATB80/V+T delivers 8.0V output with ±2.5% accuracy in fixed-frequency mode and ±4.0% in SKIP mode across −40°C to +125°C ambient and 0–600mA load. This is guaranteed by design using an internal 1.2V reference and trimmed feedback network-no external resistor adjustment required for the 8.0V variant.

Does the MAX16904SATB80/V+T support synchronization to an external clock source?

Yes, the MAX16904SATB80/V+T supports external clock synchronization via its SYNC pin. When driven with a clean square wave between 1.8MHz and 2.6MHz, the device locks its internal oscillator to that frequency-enabling deterministic EMI placement and multi-rail phase alignment in complex automotive power systems.

How does the spread-spectrum feature of the MAX16904SATB80/V+T reduce EMI emissions?

The MAX16904SATB80/V+T applies +6% frequency modulation exclusively in the positive direction around its 2.1MHz nominal switching frequency. This spreads spectral energy across a 126kHz bandwidth while guaranteeing no harmonic falls into the 1.8–2.6MHz AM radio band-reducing peak radiated emissions by up to 10dB without affecting regulation or efficiency.

What is the maximum duty cycle and dropout behavior of the MAX16904SATB80/V+T?

The MAX16904SATB80/V+T achieves up to 97% duty cycle in dropout, allowing continuous regulation when input voltage approaches V_OUT. During deep dropout, it pulses the low-side FET for ~150ns every 6.5µs to recharge the BST capacitor-maintaining gate drive and sustaining output even at V_IN = 8.4V for 8.0V output.

Is the MAX16904SATB80/V+T pin-compatible with other variants in the MAX16904 family?

Yes, all MAX16904 variants-including MAX16904SATB80/V+T-in the 10-pin TDFN-EP package share identical pinout, footprint, and thermal pad layout. This allows seamless voltage variant substitution (e.g., 3.3V, 5.0V, 8.0V) without PCB redesign, provided external components (inductor, feedback network) are re-validated for the new output.