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36V, 1MHz Step-Down Controller with Low Operating Current

Automotive Synchronous Step-Down Controller Uses Only 50µA of Quiescent Current at No Load

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3.5
VIN (V) (max) 36
VOUT1 (V) (min) 1
VOUT1 (V) (max) 10
IOUT1 (A) (max) 5
Switch Type External
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 1000
Package/Pins TSSOP/16
Budgetary
Price (See Notes)
2.66
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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) 36
VOUT1 (V) (min) 1
VOUT1 (V) (max) 10
IOUT1 (A) (max) 5
Switch Type External
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 1000
Package/Pins TSSOP/16
Budgetary
Price (See Notes)
2.66

Key Features

  • Wide 3.5V to 36V Input Voltage Range
  • 42V Input Transient Tolerance
  • High Duty Cycle During Undervoltage Transients
  • 220kHz to 1MHz Adjustable Switching Frequency
  • Current-Mode Control Architecture
  • Adjustable (1V to 10V) Output Voltage with ±2% Accuracy
  • Three Operating Modes
    • 50µA Ultra-Low Quiescent Current Skip Mode
    • Forced Fixed-Frequency Mode
    • External Frequency Synchronization
  • Lowest BOM Count, Current-Mode Control Architecture
  • Power-Good Output
  • Enable Input Compatible from 3.3V Logic Level to 42V
  • Current-Limit, Thermal Shutdown, and Overvoltage Protection
  • -40°C to +125°C Automotive Temperature Range
  • Automotive Qualified

Applications/Uses

  • Automotive
  • Industrial
  • Military
  • Point of Load

Description

The MAX16955 is a current-mode, synchronous PWM step-down controller designed to operate with input voltages from 3.5V to 36V while using only 50µA of quiescent current at no load. The switching frequency is adjustable from 220kHz to 1MHz by an external resistor and can be synchronized to an external clock up to 1.1MHz. The MAX16955 output voltage is pin programmable to be either 5V fixed or adjustable from 1V to 10V. The wide input voltage range, along with its ability to operate in dropout during undervoltage transients, makes it ideal for automotive and industrial applications.

The MAX16955 operates in fixed-frequency PWM mode and low quiescent current skip mode. It features an enable logic input, which is compatible up to 42V to disable the device and reduce its shutdown current to 10µA. Protection features include overcurrent limit, overvoltage, undervoltage, and thermal shutdown with automatic recovery. The device also features a powergood monitor to ease power-supply sequencing.

The MAX16955 is available in a thermally enhanced 16-pin TSSOP package with exposed pad and is specified for operation over the -40°C to +125°C automotive temperature range.

Simplified Block Diagram

MAX16955: Typical Operating Circuit MAX16955: Typical Operating 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 .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.