The MAX16936 is a 2.5A current-mode step-down con-
verter 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 qui-
escent 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 power-
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 sup-
plies 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.
S
42V Load Dump Protection
S
Enhanced Current-Mode Control Architecture
S
Fixed Output Voltage with ±2% Accuracy (5V/3.3V)
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
Features
S
Wide 3.5V to 36V Input Voltage Range
Applications
Point of Load Applications
Distributed DC Power Systems
Navigation and Radio Head Units
Ordering Information/Selector Guide
appears at end of data
sheet.
Typical Application Circuit
appears at end of data sheet.
For related parts and recommended products to use with this part, refer to:
www.maximintegrated.com/MAX16936.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.
19-6626; Rev 1; 4/13
MAX16936
36V, 220kHz to 2.2MHz Step-Down Converter
with 28µA Quiescent Current
ABSOLUTE MAXIMUM RATINGS
SUP, SUPSW, LX, EN to PGND ............................-0.3V to +42V
SUP to SUPSW .....................................................-0.3V to +0.3V
BIAS to AGND .........................................................-0.3V to +6V
SYNCOUT, FOSC, COMP, FSYNC,
PGOOD,
FB to AGND ........................ -0.3V to (V
BIAS
+ 0.3V)
OUT to PGND ........................................................-0.3V to +12V
BST to LX.................................................................-0.3V to +6V
AGND to PGND ...................................................-0.3V to + 0.3V
LX Continuous RMS Current ...................................................3A
*As per JEDEC51 standard (multilayer board).
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion 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.
I use the serial port 0 of ATMEGA162 to conduct serial port experiments, but no matter how I set the baud rate, the baud rate is always 1200 and cannot be changed. Please help me solve this problem. T...
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