MAX16935

PRODUCTION

36V, 3.5A, 2.2MHz Step-Down Converters with 28µA Quiescent Current

3.5A, 36V, 2MHz Automotive Buck Converter with Low I_Q and EMI Management

Data Sheet (Rev. 17) Product Selection Table

Part Models: 16
1ku List Price: Starting From $1.89

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Overview

Integration and High-Switching Frequency Saves Space
- Integrated 3.5A High-Side Switch
- Low-BOM-Count Current-Mode Control Architecture
- Fixed Output Voltage with ±2% Accuracy or Externally Resistor Adjustable (1V to 10V)
- 220kHz to 2.2MHz Switching Frequency with Three Operation Modes (Skip Mode, Forced Fixed-Frequency Operation, and External Frequency Synchronization)
- Automatic LX Slew-Rate Adjustment for Optimum Efficiency Across Operating Frequency Range
180° Out-of-Phase Clock Output at SYNCOUT Enables Cascaded Power Supplies for Increased Power Output
Spread-Spectrum Frequency Modulation Reduces EMI Emissions
Wide Input Voltage Range Supports Automotive Applications
- 3.5V to 36V Input Voltage Range
- Enable Input Compatible from 3.3V Logic Level to 42V
Robust Performance Supports Wide Range of Automotive Applications
- -40°C to +125°C Automotive Temperature Range
- Thermal-Shutdown Protection
- AEC-Q100 Qualified
Power-Good Output Allows Power-Supply Sequencing
Tight Overvoltage Protection Provides Smaller Overshoot Voltages (MAX16939)

The MAX16935/MAX16939 are 3.5A current-mode step-down converters with integrated high-side and low-side MOSFETs designed to operate with an external Schottky diode for better efficiency. The low-side MOSFET enables fixed-frequency forced-PWM (FPWM) operation under light-load applications. The devices operate with input voltages from 3.5V to 36V, while using only 28µA quiescent current at no load. The switching frequency is resistor programmable from 220kHz to 2.2MHz and can be synchronized to an external clock. The devices’ output voltage is available as 3.3V/5V fixed or adjustable from 1V to 10V. The wide input voltage range along with its ability to operate at 98% duty cycle during undervoltage transients make the devices ideal for automotive and industrial applications.

Under light-load applications, the FSYNC logic input allows the devices to either operate in skip mode for reduced current consumption or fixed-frequency FPWM mode to eliminate frequency variation to minimize EMI. Fixed-frequency FPWM mode is extremely useful for power supplies designed for RF transceivers where tight emission control is necessary. Protection features include cycle-by-cycle current limit and thermal shutdown with automatic recovery. Additional features include a power-good monitor to ease power-supply sequencing and a 180° out-of-phase clock output relative to the internal oscillator at SYNCOUT to create cascaded power supplies with multiple devices.

The MAX16935/MAX16939 operate over the -40°C to +125°C automotive temperature range and are available in 16-pin (5mm × 5mm) TQFN-EP and 16-pin TSSOP-EP packages.

Applications

Distributed DC Power Systems
Navigation and Radio Head Units
Point-of-Load Applications

Part Models: 16
1ku List Price: Starting From $1.89

Documentation

Data Sheet 1

MAX16935-MAX16939: 36V, 3.5A, 2.2MHz Step-Down Converters with 28µA Quiescent Current Data Sheet (Rev.17) 01/23/2018

Technical Articles 1

Power Control for Automotive Applications 04/02/2012

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX16935BAUES/V+	16-TSSOP_4.4_EP-4.4_MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX16935BAUES/V+T	16-TSSOP_4.4_EP-4.4_MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX16935CAUER/V+	16-TSSOP_4.4_EP-4.4_MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX16935CAUER/V+T	16-TSSOP_4.4_EP-4.4_MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX16935CAUES/V+	16-TSSOP_4.4_EP-4.4_MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX16935CAUES/V+T	16-TSSOP_4.4_EP-4.4_MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX16935CAUESB/V+	16-TSSOP_4.4_EP-4.4_MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX16935CAUESB/V+T	16-TSSOP_4.4_EP-4.4_MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX16935RATE/V+	Thin Quad Flatpack, No Leads	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX16935RATE/V+T	Thin Quad Flatpack, No Leads	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX16935RAUE/V+	16-TSSOP_4.4_EP-4.4_MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX16935RAUE/V+T	16-TSSOP_4.4_EP-4.4_MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX16935SATE/V+	Thin Quad Flatpack, No Leads	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX16935SATE/V+T	Thin Quad Flatpack, No Leads	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX16935SAUE/V+	16-TSSOP_4.4_EP-4.4_MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX16935SAUE/V+T	16-TSSOP_4.4_EP-4.4_MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jul 13, 2022 - 2236A ASSEMBLY
		pcn_2236a
MAX16935BAUES/V+	PRODUCTION
MAX16935BAUES/V+T	PRODUCTION
MAX16935CAUER/V+	PRODUCTION
MAX16935CAUER/V+T	PRODUCTION
MAX16935CAUES/V+	PRODUCTION
MAX16935CAUES/V+T	PRODUCTION
MAX16935CAUESB/V+	PRODUCTION
MAX16935CAUESB/V+T	PRODUCTION
Dec 1, 2021 - 2156 WAFER FAB
		pcn_2156
MAX16935BAUES/V+	PRODUCTION
MAX16935BAUES/V+T	PRODUCTION
MAX16935CAUER/V+	PRODUCTION
MAX16935CAUER/V+T	PRODUCTION
MAX16935CAUES/V+	PRODUCTION
MAX16935CAUES/V+T	PRODUCTION
MAX16935CAUESB/V+	PRODUCTION
MAX16935CAUESB/V+T	PRODUCTION
MAX16935RATE/V+	PRODUCTION
MAX16935RATE/V+T	PRODUCTION
MAX16935RAUE/V+	PRODUCTION
MAX16935RAUE/V+T	PRODUCTION
MAX16935SATE/V+	PRODUCTION
MAX16935SATE/V+T	PRODUCTION
MAX16935SAUE/V+	PRODUCTION
MAX16935SAUE/V+T	PRODUCTION
Jan 17, 2018 - 1721E ASSEMBLY
		pcn_1721e
MAX16935CAUER/V+	PRODUCTION
MAX16935CAUER/V+T	PRODUCTION
Feb 11, 2025 - 2455B ASSEMBLY
		pcn_2455b
MAX16935RATE/V+	PRODUCTION
MAX16935RATE/V+T	PRODUCTION
MAX16935SATE/V+	PRODUCTION
MAX16935SATE/V+T	PRODUCTION
MAX16935SAUE/V+	PRODUCTION
MAX16935SAUE/V+T	PRODUCTION
Jun 18, 2021 - 2161 ASSEMBLY
		pcn_2161
MAX16935RATE/V+	PRODUCTION
MAX16935RATE/V+T	PRODUCTION
MAX16935SATE/V+	PRODUCTION
MAX16935SATE/V+T	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Switching Regulators & Controllers 1
MAX16936	PRODUCTION	36V, 220kHz to 2.2MHz Step-Down Converters with 28µA Quiescent Current

Tools & Simulations

EE-Sim Power® Tools 1

The EE-Sim DC-DC Converter Tool uses your requirements to quickly create a complete power design including a schematic, BOM with commercially available parts, and time and frequency domain simulations. Your customized schematic can be downloaded for further analysis in the standalone EE-Sim OASIS Simulator, featuring SIMPLIS and SIMetrix SPICE engines.

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SIMPLIS Models 1

MAX16935 SIMPLIS Schematic

Evaluation Kits

Evaluation Kit for the MAX16935

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Features and Benefits

Wide 3.5V to 36V Input Supply Range
Forced-PWM or Skip-Mode Operation
Programmable Switching Frequency
Power-Good Output
Proven PCB Layout
Fully Assembled and Tested

Product Details

The MAX16935 evaluation kit (EV kit) demonstrates the MAX16935 high-voltage, current-mode step-down converter with low operating current. The EV kit operates over a wide 3.5V to 36V input range and the output is set for 5V at 3.5A.

The EV kit comes with the MAX16935RAUE/V+ installed.