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Automotive 36V 3.5A Buck Converter with 3.5μA IQ

Best-in-Class UltraLow IQ Buck Ideal for Automotive Applications

Product Details

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) 3.5
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) 2100
400
Design Tools EE-Sim
Package/Pins TQFN/20
Budgetary
Price (See Notes)
0
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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) 3.5
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) 2100
400
Design Tools generateDesignEESIMUrl('http://maxim.transim.com/pwm2/designreq/Index?partId=9982', '')
Package/Pins TQFN/20
Budgetary
Price (See Notes)
0

Key Features

  • Synchronous DC-DC Converter with Integrated FETs
    • 3.5A Output-Current Capability
    • 3.5μA Quiescent Current in Standby Mode
  • Small Solution Size Saves Space
    • 65ns Minimum On-Time
    • 2.1MHz or 400kHz Fixed Operating Frequency Options
    • Programmable 3V to 12V Output for the Buck, or Fixed 5V/3.3V Options Available
    • 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
    • 3V 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 MAX20079 is a small, automotive-grade synchronous buck converter with integrated high-side and low-side switches. The device is designed to deliver up to 3.5A with input voltages from +3V to +36V while using only 3.5µA quiescent current at no load. The MAX20079 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. MAX20079 can operate in drop-out by running at 99% duty cycle, making it ideal for automotive and industrial applications. The IC offers standard parts with fixed output voltages of 3.3V and 5V. In addition, MAX20079 can be configured for output voltages from 3V to 12V, using an external resistor divider. Frequency is internally fixed at 2.1MHz, which allows for small external components, reduces output ripple, and guarantees there is no AM interference. A 400kHz option is also offered to provide minimum switching losses and maximum efficiency. MAX20079 automatically enters skip mode at light loads with ultra-low quiescent current of 3.5µA at no load. It offers pin-enabled spread-spectrum frequency modulation designed to minimize EMI-radiated emissions due to the modulation frequency.

The MAX20079 comes in a small 4mm x 4mm 20-pin SW-TQFN package and uses very few external components. The intelligent package layout results in an extremely low-noise solution with superior EMI performance.

Simplified Block Diagram

MAX20079: Typical Application Circuit MAX20079: Typical Application Circuit Zoom icon

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 .