MAX16955

PRODUCTION

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

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

Data Sheet (Rev. 4) Product Selection Table

Part Models: 4
1ku List Price: Starting From $2.85

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Overview

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

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.

Applications

Automotive
Industrial
Military
Point of Load

Part Models: 4
1ku List Price: Starting From $2.85

Documentation

Data Sheet 1

MAX16955: 36V, 1MHz Step-Down Controller with Low Operating Current Data Sheet (Rev.4) 08/27/2014

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX16955AUE+	16-TSSOP_4.4_EP-4.4_MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX16955AUE+T	16-TSSOP_4.4_EP-4.4_MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX16955AUE/V+	16-TSSOP_4.4_EP-4.4_MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX16955AUE/V+T	16-TSSOP_4.4_EP-4.4_MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

May 11, 2022 - 2236N ASSEMBLY
		pcn_2236n
MAX16955AUE+	PRODUCTION	pcn_2236n
Oct 31, 2019 - 2000 ELECTRICAL DATASHEET
		pcn_2000
MAX16955AUE+	PRODUCTION
MAX16955AUE/V+	PRODUCTION
MAX16955AUE/V+T	PRODUCTION
Jul 13, 2022 - 2236A ASSEMBLY
		pcn_2236a
MAX16955AUE/V+	PRODUCTION
MAX16955AUE/V+T	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Evaluation Kits

Evaluation Kit for the MAX16955

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Features and Benefits

6V to 36V Input Range
5V at Up to 5A Output
400kHz Switching Frequency
Selectable Forced Fixed-Frequency PWM Mode, SKIP Mode, or External Synchronization
Power-Good LED Indicator
Enable Input
Cycle-by-Cycle Current Limit and Thermal Protection
Proven PCB Layout
Fully Assembled and Tested

Product Details

The MAX16955 evaluation kit (EV kit) is a fully assembled and tested PCB that contains all the components necessary to evaluate the performance of the MAX16955 synchronous PWM step-down controller. The device is available in a 16-pin TSSOP package and features an exposed pad for enhanced thermal dissipation.

The EV kit requires a 6V to 36V power supply for normal operation. The EV kit output is configured to 5V and can deliver up to 5A output current. The EV kit can be easily reconfigured to operate the controller in continuous PWM mode, SKIP mode, or external synchronization operation. The controller switching frequency is set to 400kHz. The EV kit includes a jumper to enable the circuit and an LED to monitor the power-good output.