Analog Devices Inc./Maxim Integrated MAX16977SAUE/V+CMF

Overview

The MAX16977SAUE/V+CMF from Maxim Integrated is a 36V, 2A, current-mode synchronous step-down DC-DC converter with integrated 70mΩ high-side MOSFET, adjustable 1MHz–2.2MHz switching frequency, 30µA standby quiescent current, and automotive-grade -40°C to +125°C operation - designed for direct car-battery-to-sub-5V conversion in ADAS camera modules and infotainment power rails.

For engineers reviewing the MAX16977SAUE/V+CMF datasheet, MAX16977SAUE/V+CMF pinout, MAX16977SAUE/V+CMF application, or MAX16977SAUE/V+CMF equivalent, this page delivers verified package mapping (16-pin TSSOP), confirmed pin functions (e.g., FSYNC for external clock sync, PGOOD for sequencing), real-world load-transient response data (80ns min on-time, fast-loop architecture), and two validated alternative parts with documented functional trade-offs.

Technical Context

This IC implements constant-frequency current-mode control with internal transconductance error amplifier (gm = 900µS), 80ns minimum on-time, and 98% maximum duty cycle during undervoltage transients - enabling stable 5V output even at 3.5V input during cold-crank conditions. It integrates a 5V BIAS LDO (4.7–5.3V, ±100mV line/load regulation) and supports both fixed 5V and adjustable 1V–10V outputs via FB pin configuration.

Protection architecture includes overcurrent limit (2.4–4A LX current limit), overvoltage trip (105–115% VFB), thermal shutdown at +175°C with 15°C hysteresis, and short-circuit robustness (continuous rating). The device enters skip mode below 300mA load, reducing IQ to 30µA while maintaining regulation via VOUT-powered internal circuitry.

Key Specifications

Pinout & Package

MAX16977SAUE/V+CMF is packaged in a 16-pin TSSOP (4.4mm × 5mm) with exposed pad (EP), optimized for automotive thermal dissipation (θ_JA = 38.3°C/W, θ_JC = 3°C/W). EP must be soldered to a large contiguous copper ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down converter applications.

Compared with LM61480QWRNXTQ1 and TPS62933QPWRRQ1, the MAX16977SAUE/V+CMF uniquely combines dual-supply inputs (SUP/SUPSW) for cold-crank resilience, programmable fSW with FSYNC sync, and 30µA standby IQ - making it optimal for cost-sensitive ADAS camera power where thermal margin and EMI control are prioritized over raw current headroom.

Availability

MAX16977SAUE/V+CMF is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment head units, and telematics control units requiring stable component supply with AEC-Q100 qualification, long-lifecycle support, and traceable sourcing.

Supply support for MAX16977SAUE/V+CMF 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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for automotive, industrial, and communications markets.

The MAX16977 belongs to Maxim's automotive power-management portfolio, engineered specifically for harsh-environment DC-DC conversion in ADAS, infotainment, and body electronics - emphasizing cold-crank resilience, low IQ, and EMI robustness.

FAQ

What is the maximum input voltage transient the MAX16977SAUE/V+CMF can withstand?

The MAX16977SAUE/V+CMF supports 42V input transients for durations under 1 second, meeting ISO 7637-2 Pulse 5a requirements for automotive load-dump protection. This rating applies to both SUP and SUPSW pins, and the device maintains regulation during the event without latch-up or damage when properly decoupled with recommended input capacitance.

Does the MAX16977SAUE/V+CMF require external compensation components?

Yes, the MAX16977SAUE/V+CMF requires an external RC network from COMP to GND for loop stability. Typical values are R_COMP = 20kΩ and C_COMP1 = 2.2nF, as shown in the datasheet's typical application circuit. These values optimize phase margin for 2.2µH inductors and 22µF output capacitors across the full temperature range.

Can the MAX16977SAUE/V+CMF operate with only a 5V output and no external feedback resistors?

Yes, the MAX16977SAUE/V+CMF supports pin-selectable 5V fixed output by connecting the FB pin directly to the BIAS pin. In this configuration, the internal 1.00V reference and precision amplifier deliver 4.925–5.075V output with ±0.5% load regulation - eliminating external resistors and reducing component count.

What is the purpose of the separate SUP and SUPSW pins on the MAX16977SAUE/V+CMF?

SUP supplies the internal 5V BIAS LDO, while SUPSW powers the high-side MOSFET gate driver. This dual-rail architecture enables stable operation during cold-crank events: when battery voltage drops to 3.5V, SUPSW can sag independently while SUP maintains BIAS regulation, allowing the controller to sustain 98% duty cycle and hold VOUT regulation.

How does the MAX16977SAUE/V+CMF enter and exit skip mode?

The MAX16977SAUE/V+CMF enters skip mode automatically when inductor current falls below 300mA (ISKIP_TH). It exits skip mode when load increases above this threshold, resuming PWM operation within one switching cycle. During skip mode, most internal circuitry draws power from VOUT (if 3–5.5V), reducing total supply current to 30µA.