MAX16935 Datasheet, PDF (1/17 Pages) Maxim Integrated Products – Step-Down Converter

EVALUATION KIT AVAILABLE
MAX16935
36V, 3.5A, 2.2MHz Step-Down Converter
with 28µA Quiescent Current
General Description
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 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 device’s
output voltage is available as 5V fixed or adjustable from
1V to 10V. The wide input voltage range along with its
ability to operate at 98% duty cycle during undervolt-
age 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 a
power-good monitor to ease power-supply sequenc-
ing 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 auto-
motive temperature range and is available in a 16-pin
TSSOP-EP package.
Features
S Wide 3.5V to 36V Input Voltage Range (42V Tolerant)
S Integrated 3.5A High-Side Switch
S Enhanced Current-Mode Control Architecture
S Fixed Output Voltage with ±2% Accuracy (5V) or
Externally Resistor Adjustable (1V to 10V)
S 220kHz to 2.2MHz Switching Frequency with Three
Operation Modes
 28µA Ultra-Low Quiescent Current Skip Mode
 Forced Fixed-Frequency Operation
 External Frequency Synchronization
S Spread-Spectrum Frequency Modulation
S Automatic LX Slew Rate Adjustment for Optimum
Efficiency Across Operating Frequency Range
S 180° Out-of-Phase Clock Output at SYNCOUT
S Low-BOM-Count Current-Mode Control
Architecture
S Power-Good Output
S Enable Input Compatible from 3.3V Logic Level
to 42V
S Thermal Shutdown Protection
S -40°C to +125°C Automotive Temperature Range
S AEC-Q100 Qualified
Applications
Point-of-Load Applications
Distributed DC Power Systems
Navigation and Radio Head Units
Ordering Information/Selector Guide and Typical
Application Circuit appear at end of data sheet.
For related parts and recommended products to use with this part, refer to: www.maximintegrated.com/MAX16935.related
For pricing, delivery, and ordering information, please contact Maxim Direct at
1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
19-6868; Rev 2; 3/14