MAX16955

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

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


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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.
MAX16955: Typical Operating Circuit MAX16955: Typical Operating Circuit Enlarge+

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

See parametric specs for Step-Down Switching Regulators (409)


Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingPower Good SignalDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX16955 3.5361105
Preset
Resistor
5ExternalYesYes11000
TSSOP/16
$2.28 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX16955EVKIT: Evaluation Kit for the MAX16955
Request Reliability Report for: MAX16955 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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