MAX5021

PRODUCTION

Current-Mode PWM Controllers for Isolated Power Supplies

SOT23 Universal Off-Line Power Supply Controller

Data Sheet (Rev. 1) Product Selection Table

Part Models: 2
1ku List Price: Starting From $0.67

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Overview

Available in a Tiny 6-Pin SOT23 Package
50µA Typical Startup Current
1.2mA Typical Operating Current
Large UVLO Hysteresis of 14V
Fixed Switching Frequency of 262kHz ±12%
50% Maximum Duty Cycle Limit (MAX5021)
75% Maximum Duty Cycle Limit (MAX5022)
60ns Cycle-by-Cycle Current-Limit Response Time

The MAX5021/MAX5022 current-mode PWM controllers contain all the control circuitry required for the design of wide input voltage range isolated power supplies. These devices are well suited for use in universal input (85VAC to 265VAC) off-line or telecom (-36VDC to -72VDC) power supplies.

An undervoltage lockout (UVLO) circuit with large hysteresis coupled with low startup and operating current reduce power dissipation in the startup resistor and allow use of ceramic bypass capacitors. The 262kHz switching frequency is internally trimmed to }12% accuracy; this allows the optimization of the magnetic and filter components resulting in compact, cost-effective power supplies. The MAX5021 with 50% maximum duty cycle and MAX5022 with 75% maximum duty cycle are recommended for forward converters and flyback converters, respectively. The MAX5021/MAX5022 are available in 6-pin SOT23, 8-pin µMAX, and 8-pin DIP packages and are rated for operation over the -40‹C to +85‹C temperature range.

Applications

Isolated Power Supplies
Low-Power Telecom Power Supplies
Mobile Phone Chargers
Standby Power Supplies
Universal Offline Power Supplies

Part Models: 2
1ku List Price: Starting From $0.67

Documentation

Data Sheet 1

MAX5021-MAX5022: Current-Mode PWM Controllers for Isolated Power Supplies Data Sheet (Rev.1) 12/24/2001

Technical Articles 3

Programmable Fan Controllers 06/21/2007

How to Minimize Power Dissipation in Li+ Linear Chargers 02/21/2002

Designing Compact Telecom Power Supplies 07/17/2002

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
MAX5021EUT+	Small-Outline Transistor Package	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX5021EUT+T	Small-Outline Transistor Package	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Nov 1, 2021 - 2209 ASSEMBLY
		pcn_2209
MAX5021EUT+	PRODUCTION
MAX5021EUT+T	PRODUCTION

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

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