Features and Benefits

  • 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)

Product Details

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.


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

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Tools & Simulations

EE-Sim Power® Tools

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.



MAX16935 SIMPLIS Schematic

MAX16935 SIMPLIS Schematic

Product Recommendations

MAX16935 Companion Parts

Recommended Related Parts

Design Resources

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.

PCN-PDN Information

Sample & Buy

Ordering FAQs

See our Ordering FAQs for answers to questions about online orders, payment options and more.


Buy Now Pricing

(**) Displayed Buy Now Price and Price Range is based on small quantity orders.


List Pricing

(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


Lead Times

Please see the latest communication from our CCO regarding lead times.



Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Price Table Help