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36V, 1.2A Mini Buck Converter with 3.5µA IQ

Best-in-Class Ultra IQ Low Mini Buck Ideal for Automotive Applications

Product Details

Key Features

Applications/Uses

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3.5
VIN (V) (max) 40
VOUT1 (V) (min) 1
VOUT1 (V) (max) 10
IOUT1 (A) (max) 1.2
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Preset or Adj
Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 2100
Design Tools EE-Sim
Package/Pins TDFN-CU/12
Budgetary
Price (See Notes)
$1.30 @1k
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3.5
VIN (V) (max) 40
VOUT1 (V) (min) 1
VOUT1 (V) (max) 10
IOUT1 (A) (max) 1.2
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Preset or Adj
Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 2100
Design Tools generateDesignEESIMUrl('http://maxim.transim.com/pwm2/designreq/Index?partId=29512', '')
Package/Pins TDFN-CU/12
Budgetary
Price (See Notes)
$1.30 @1k

Key Features

  • Synchronous DC-DC Converter with Integrated FETs
  • 3.5μA Quiescent Current when in Standby Mode
  • Small Solution Size Saves Space
    • 2.1MHz Frequency
    • Fixed 5V/3.3V Output Voltage Options Available
    • Fixed 2.5ms Internal Soft-Start
    • Fixed Output Voltage with ±2% Output Accuracy
    • Adjustable Voltage Output 3V to 10V Available (MAX25231ATCD)
    • 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 VIN Range
    • 40V Load-Dump Protection
    • 99% Duty-Cycle Operation with Low Dropout
    • -40°C to +125°C Automotive Temperature Range
    • AEC-Q100 Qualified

Applications/Uses

  • Always-On, Low-Quiescent-Current Systems
  • Automotive
  • High-Voltage DC-DC Converters
  • Industrial

Description

The MAX25231 is a small, synchronous automotive buck converter with integrated high-side and low-side switches. The MAX25231 is designed to deliver up to 1.2A, with 3.5V to 36V input voltages, while using only 3.5μA quiescent current at no load. The device provides an accurate output voltage of ±2% within the normal operation input range of 6V to 18V. With 65ns 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 automotive and industrial applications. The device offers two fixed output voltages of 5V and 3.3V. Frequency is internally fixed at 2.1MHz, which allows for small external components and reduced output ripple, and guarantees no AM interference. The device automatically enters skip mode at light loads with ultra-low quiescent current of 3.5μA at no load. The device offers pin-enabled spread-spectrum frequency modulation designed to minimize EMI-radiated emissions due to the modulation frequency.

The MAX25231 is available in a small (3mm x 3mm) 12-pin TDFN package with an exposed pad, and uses very few external components.

Simplified Block Diagram

MAX25231: Typical Application Circuit MAX25231: Typical Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .