MAX16936 36V, 220kHz to 2.2MHz Step-Down Converter with 28µA Quiescent Current
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MAX16936 36V, 220kHz to 2.2MHz Step-Down Converter with 28µA Quiescent Current - 1

36V, 220kHz to 2.2MHz Step-Down Converter with 28µA Quiescent Current General Description The MAX16936 is a 2.5A 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 28FA 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 MAX16936’s output voltage is available as 5V/3.3V 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 MAX16936 ideal for automotive and industrial applications. Under light-load applications, the FSYNC logic input allows the MAX16936 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 powergood 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 MAX16936s. The MAX16936 operates over the -40NC to +125NC automotive temperature range and is available in 16-pin TSSOP-EP and 5mm x 5mm, 16-pin TQFN-EP packages. ●● Point-of-Load Applications ●● Distributed DC Power Systems ●● Navigation and Radio Head Units ●● Integration and High-Switching Frequency Saves Space • Integrated 2.5A High-Side Switch • Low-BOM-Count Current-Mode Control Architecture • Fixed Output Voltage with ±2% Accuracy (5V) 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 • • • • 42V Load-Dump Protection -40°C to +125°C Automotive Temperature Range Thermal-Shutdown Protection AEC-Q100 Qualified ●● Power-Good Output Allows Power-Supply Sequencing Ordering Information/Selector Guide and Typical Application Circuit appear at end of data sheet.

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MAX16936 36V, 220kHz to 2.2MHz Step-Down Converter with 28µA Quiescent Current - 2

36V, 220kHz to 2.2MHz Step-Down Converter with 28µA Quiescent Current Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Package Thermal Characteristics (Note 2) TSSOP Note 1: Self-protected against transient voltages exceeding these limis for ≤ 50ns...

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MAX16936 36V, 220kHz to 2.2MHz Step-Down Converter with 28µA Quiescent Current - 3

36V, 220kHz to 2.2MHz Step-Down Converter with 28µA Quiescent Current Electrical Characteristics (continued) (VSUP = VSUPSW = 14V, VEN = 14V, L1 = 2.2FH, CIN = 4.7FF, COUT = 22FF, CBIAS = 1FF, CBST = 0.1FF, RFOSC = 12kI, TA = TJ = -40NC to +125NC, unless otherwise noted. Typical values are at TA = +25NC.) PARAMETER VFB = VBIAS, 6V < VSUPSW < 36V, MAX16936____A/V+, fixed-frequency mode VFB = VBIAS, 6V < VSUPSW < 36V, MAX16936____B/V+, fixed-frequency mode FPWM Mode Output Voltage (Note 3) Skip Mode Output Voltage (Note 4) Load Regulation No load, VFB = VBIAS, MAX16936____A/ V+, skip mode VFB...

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MAX16936 36V, 220kHz to 2.2MHz Step-Down Converter with 28µA Quiescent Current - 4

36V, 220kHz to 2.2MHz Step-Down Converter with 28µA Quiescent Current Electrical Characteristics (continued) (VSUP = VSUPSW = 14V, VEN = 14V, L1 = 2.2FH, CIN = 4.7FF, COUT = 22FF, CBIAS = 1FF, CBST = 0.1FF, RFOSC = 12kI, TA = TJ = -40NC to +125NC, unless otherwise noted. Typical values are at TA = +25NC.) PARAMETER OSCILLATOR FREQUENCY Oscillator Frequency EXTERNAL CLOCK INPUT (FSYNC) External Input Clock Acquisition time External Input Clock Frequency External Input Clock High Threshold VFSYNC rising External Input Clock Low Threshold VFSYNC falling Soft-Start Time Enable Input High...

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MAX16936 36V, 220kHz to 2.2MHz Step-Down Converter with 28µA Quiescent Current - 5

36V, 220kHz to 2.2MHz Step-Down Converter with 28µA Quiescent Current Typical Operating Characteristics (VSUP = VSUPSW = 14V, VEN = 14V, VOUT = 5V, VFYSNC = 0V, RFOSC = 12kI, TA = +25NC, unless otherwise noted.) SUPPLY CURRENT vs. SUPPLY VOLTAGE SWITCHING FREQUENCY vs. RFOSC MAX16936 toc07 VOUT LOAD REGULATION 5.10 VOUT = 5V, VIN = 14V SKIP MODE SKIP MODE SKIP MODE VOUT LOAD REGULATION EFFICIENCY vs. LOAD CURRENT 100 EFFICIENCY vs. LOAD CURRENT 100

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MAX16936 36V, 220kHz to 2.2MHz Step-Down Converter with 28µA Quiescent Current - 6

36V, 220kHz to 2.2MHz Step-Down Converter with 28µA Quiescent Current Typical Operating Characteristics (continued) (VSUP = VSUPSW = 14V, VEN = 14V, VOUT = 5V, VFYSNC = 0V, RFOSC = 12kI, TA = +25NC, unless otherwise noted.) FULL-LOAD STARTUP BEHAVIOR MAX16936 toc13 SLOW VIN RAMP BEHAVIOR SHDN CURRENT vs. SUPPLY VOLTAGE 10 SLOW VIN RAMP BEHAVIOR SYNC FUNCTION DIPS AND DROPS TEST

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MAX16936 36V, 220kHz to 2.2MHz Step-Down Converter with 28µA Quiescent Current - 7

36V, 220kHz to 2.2MHz Step-Down Converter with 28µA Quiescent Current Typical Operating Characteristics (continued) (VSUP = VSUPSW = 14V, VEN = 14V, VOUT = 5V, VFYSNC = 0V, RFOSC = 12kI, TA = +25NC, unless otherwise noted.) COLD CRANK LOAD DUMP SHORT CIRCUIT IN PWM MODE LOAD TRANSIENT (PWM MODE) FSW = 2.2MHz VOUT = 5V VOUT (AC-COUPLED) INDUCTOR CURRENT

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