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Maxim Integrated MAX16935

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


TopologyBuck Converter
Input voltage3.5-36 V
Switching frequency220-2200 kHz
Output 15 V / 3.5 A
IC revision9


The MAX16935 is a 3.5A current-mode step-down converter 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 device operates with input voltages from 3.5V to 36V, while using only 28FAquiescent current at no load. The switching frequency is resistor programmable from 220kHz to 2.2MHz and can be synchronized to an external clock. The device’s output voltage is available as 5V fixed or adjustable from 1V to 10V. The wide input voltage range along with itsability to operate at 98% duty cycle during undervoltage transients make the device ideal for automotive and industrial applications.Under light-load applications, the FSYNC logic input allows the device 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 apower-good monitor to ease power-supply sequencing and a 180N out-of-phase clock output relative to the internal oscillator at SYNCOUT to create cascaded power supplies with multiple devices.The device operates over the -40NC to +125NC automotive temperature range and is available in a 16-pin TSSOP-EP package.


  • Wide 3.5V to 36V Input Voltage Range (42V Tolerant)
  • Integrated 3.5A High-Side Switch
  • Enhanced Current-Mode Control Architecture
  • Fixed Output Voltage with ±2% Accuracy (5V) orExternally Resistor Adjustable (1V to 10V)
  • 220kHz to 2.2MHz Switching Frequency with ThreeOperation Modes 28μA Ultra-Low Quiescent Current Skip Mode Forced Fixed-Frequency Operation External Frequency Synchronization
  • Spread-Spectrum Frequency Modulation
  • Automatic LX Slew Rate Adjustment for OptimumEfficiency Across Operating Frequency Range
  • 180° Out-of-Phase Clock Output at SYNCOUT
  • Low-BOM-Count Current-Mode ControlArchitecture
  • Power-Good Output
  • Enable Input Compatible from 3.3V Logic Levelto 42V
  • Thermal Shutdown Protection
  • -40°C to +125°C Automotive Temperature Range
  • AEC-Q100 Qualified

Typical applications

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