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MAX20077/MAX25277
36V, 2.5A Mini Buck Converters with 3.5μA I
Q
General Description
Benefits and Features
● Synchronous DC-DC Converter with Integrated FETs
The MAX20077/MAX25277 is a small, synchronous buck
converter with integrated high-side and low-side switches.
The device is designed to deliver up to 2.5A (2.0A for the
MAX20077ATCC/VY+ variant) with 3.5V to 36V input volt-
ages while using only 3.5µA quiescent current at no load.
• MAX20077ATCA/VY+/B/D/E = 2.5A I
• MAX20077ATCC/VY+ = 2.0A I
• 3.5µA Quiescent Current in Standby Mode
OUT
OUT
● Small Solution Size Saves Space
• 20ns Minimum On-Time
The device provides an accurate output voltage of ±2%
in FPWM mode within the normal 6V to 18V operation
input range. With 20ns minimum on-time capability, the
converter is capable of large input-to-output conversion
ratios. Voltage quality can be monitored by observing
the PGOOD signal. The device can operate in dropout
by running at 99% duty cycle, making it ideal for auto-
motive and industrial applications. The device offers
two fixed 5V and 3.3V output voltages. In addition, the
device can be configured for 1V to 10V output voltages
using an external resistor-divider. Frequency is internally
fixed at 2.1MHz, which allows for small external compo-
nents and reduced output ripple, and guarantees no AM
interference. A 400kHz option is also offered to provide
minimum switching losses and maximum efficiency. The
device automatically enters skip mode at light loads with
ultra-low 3.5µA quiescent current at no load. The device
offers pin-enabled spread-spectrum-frequency modula-
tion designed to minimize EMI-radiated emissions due to
the modulation frequency.
• 2.1MHz or 400kHz Operating Frequency
• Programmable 1V to 10V Output
Voltages, or Fixed 5V/3.3V Options Available
• Fixed 3.5ms Internal Soft-Start
• Fixed Output Voltage with ±2% Output Accuracy
in FPWM Mode (5V/3.3V), or Externally Resistor
Adjustable
(1V to 10V) with ±1.5% FB Accuracy
• Innovative Current-Mode-Control Architecture
Minimizes Total Board Space and BOM Count
● PGOOD Output and High-Voltage EN Input Simplify
Power Sequencing
● Protection Features and Operating Range Ideal for
Automotive Applications
• 3.5V to 36V Operating V Range
IN
• 40V Load-Dump Protection
• 99% Duty-Cycle Operation with Low Dropout
• -40°C to +125°C Automotive Temperature Range
• AEC-Q100 Qualified
The MAX20077/MAX25277 variants are available in a
small (3mm x 3mm), 12-pin, side-wettable TDFN pack-
age with an exposed pad, and requires very few external
components.
Simplified Block Diagram
SPS SYNC
HIGH-
VOLTAGE
LDO
REF
EN
BST
SUP
BANDGAP
OSC
BIAS
Applications
CLK
● Automotive
● Industrial
CURRENT SENSE
+
SLOPE COMP
SOFT-
START
LX
LOGIC
CONTROL
● High-Voltage DC-DC Converters
BIAS
OUT
FB
PWM
EAMP
COMP
FB
PGND
Ordering Information appears at end of data sheet.
SW1
VRESET
MAX20077
SW2
PGOOD
AGND
19-100267; Rev 6; 6/19