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36V, 3A Mini Buck Converter with 3.5uA IQ

Best-in-Class Ultra-Low IQ 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) 3
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 3
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 400
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) 3
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 3
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 400
Design Tools generateDesignEESIMUrl('http://maxim.transim.com/pwm2/designreq/Index?partId=29509', '')
Package/Pins TDFN-CU/12
Budgetary
Price (See Notes)
$1.30 @1k

Key Features

  • Synchronous DC-DC Converter with Integrated FETs
    • MAX25232ATCA/VY+/B = 2.5A IOUT
    • MAX25232ATCD/VY+/E = 3A IOUT
    • 3.5µA Quiescent Current when in Standby Mode
  • Small Solution Size Saves Space
    • 65ns Minimum On-Time
    • 2.1MHz or 400kHz Operating Frequency
    • Fixed Output Voltages with ±2% Output Accuracy in FPWM Mode (5V/3.3V)
    • Fixed 3.5ms Internal Soft-Start
    • 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

  • Automotive
  • High-Voltage DC-DC Converters
  • Industrial

Description

The MAX25232 is a small, synchronous buck converter with integrated high-side and low-side switches. The device is designed to deliver up to 3A 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% in FPWM mode within the normal 6V to 18V operation input range. 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 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 components 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 modulation designed to minimize EMI-radiated emissions due to the modulation frequency.

The MAX25232 variants are available in a small (3mm x 3mm), 12-pin, side-wettable TDFN package with an exposed pad, and require very few external components.

Simplified Block Diagram

MAX25232: Typical Application Circuit MAX25232: 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 .