MAX1954A

PRODUCTION

Low-Cost, Current-Mode PWM Buck Controller with Foldback Current Limit

Data Sheet (Rev. 1) Product Selection Table

Part Models: 2
1ku List Price: Starting From $1.82

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Overview

Current-Mode Controller
Fixed-Frequency PWM
Foldback Current Limit
Output Down to 0.8V with ±1% FB Accuracy
3.0V to 13.2V Input Voltage
300kHz Switching Frequency
25A Output-Current Capability
93% Efficiency
All-N-Channel-MOSFET Design for Low Cost
No Current-Sense Resistor Needed
Internal Digital Soft-Start
Small 10-Pin µMAX Package

The MAX1954A synchronous current-mode, pulse-width modulation (PWM) buck controller is pin compatible with the popular MAX1954 and is suitable for applications where cost and size are critical.

The MAX1954A operates from an input voltage range of 3.0V to 13.2V, independent of the IC supply. The output voltage is adjustable down to 0.8V. The IC operates at a fixed 300kHz switching frequency and provides up to 25A of output current with efficiency up to 95%. This controller has excellent transient response resulting in smaller output capacitance.

The MAX1954A features foldback current limiting that greatly reduces input current and component power dissipation during output overload or short-circuit conditions.

The compensation and shutdown control (COMP) input, in addition to providing compensation to the error amplifier, can be pulled low to shut down the converter. An input undervoltage lockout is provided to ensure proper operation during power sags to prevent the external power MOSFETs from overheating. Internal digital soft-start is included to reduce inrush current and save an external capacitor.

The MAX1954A is available in a tiny 10-pin µMAX® package to minimize PC board space.

Applications

Graphic Cards and Video Cards
Low-Voltage Distributed Power
Microprocessor Cores
PCs and Servers
Printers and Scanners
Telecom/Networks

Part Models: 2
1ku List Price: Starting From $1.82

Documentation

Data Sheet 1

MAX1954A: Low-Cost, Current-Mode PWM Buck Controller with Foldback Current Limit Data Sheet (Rev.1) 06/20/2005

Technical Articles 1

An Accurate Control Loop Model for Current-Mode Step-Down Controllers 01/28/2005

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
MAX1954AEUB+	10-MINI_SO-N/A	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1954AEUB+T	10-MINI_SO-N/A	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Nov 26, 2018 - 1753A ASSEMBLY
		pcn_1753a
MAX1954AEUB+	PRODUCTION
MAX1954AEUB+T	PRODUCTION

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

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Switching Regulators & Controllers 3
MAX1954	PRODUCTION	Low-Cost, High-Frequency, Current-Mode PWM Buck Controllers
MAX8545	PRODUCTION	Low-Cost, Wide Input Range, Step-Down Controllers with Foldback Current Limit
MAX8546	PRODUCTION	Low-Cost, Wide Input Range, Step-Down Controllers with Foldback Current Limit

Evaluation Kits

Evaluation Kit for the MAX1954A

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Features and Benefits

Current-Mode Controller

300kHz Fixed-Frequency PWM

0.8V Minimum Output Voltage

10.8V to 13.2V Input Voltage Range

>90% Efficiency

Output Shutdown Mode

All n-Channel MOSFET Design for Low Cost

No Current-Sense Resistor Needed

Foldback Short-Circuit Protection

Thermal-Overload Protection

Small 10-Pin µMAX® Package

Assembled and Tested

Product Details

The MAX1954A evaluation kit (EV kit) demonstrates the MAX1954A buck controller application circuit. The EV kit generates a 1.5V output voltage at load currents up to 5A from a 10.8V to 13.2V input voltage range independent of the IC supply voltage. The MAX1954A switches at 300kHz and has better than 90% efficiency with the supplied components.

The EV kit comes fully assembled and tested.