MAX16936 36V, 220kHz to 2.2MHz Step-Down Converter with 28µA Quiescent Current0 pages

EVALUATION KIT AVAILABLE

MAX16936

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.

Applications

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

19-6626; Rev 8; 3/15

Benefits and Features

●● Integration and High-Switching Frequency Saves
Space
•t Integrated 2.5A High-Side Switch
•t Low-BOM-Count Current-Mode Control
Architecture
•t Fixed Output Voltage with ±2% Accuracy (5V) or
Externally Resistor Adjustable (1V to 10V)
•t 220kHz to 2.2MHz Switching Frequency with
Three Operation Modes (Skip Mode, Forced
Fixed-Frequency Operation, and External
Frequency Synchronization)
•t 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
•t 3.5V to 36V Input Voltage Range
•t Enable Input Compatible from 3.3V Logic Level
to 42V
●● Robust Performance Supports Wide Range of
Automotive Applications
•t
•t
•t
•t

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.