Maxim > Products > Power and Battery Management > MAX5021, MAX5022

MAX5021, MAX5022

Current-Mode PWM Controllers for Isolated Power Supplies

SOT23 Universal Off-Line Power Supply Controller

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

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.

Data Sheet

Download	Rev 1	(PDF, 248kB)
E-Mail

An evaluation kit is available: MAX5022EVKIT

Key Features

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

Applications/Uses

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

Key Specifications:

Isolated Power Supplies

Part Number

V_IN
(V)

Topology

Cntrl. Loop

Feedback

Freq.
(kHz)

Duty Cycle
(%)

I_STARTUP
(mA)

I_CC
(mA)

Gate Drive Current
(A)

Oper. Temp.
(°C)

Budgetary Price

min

max

min

max

See Notes

MAX5021

375

Single-Ended Forward

Current Mode

Opto

262

0.085

2.43

0.25

-40 to +85

$0.66 @1k

MAX5022

Flyback

$0.69 @1k

See All Isolated Power Supplies (20)

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 prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Typical Operating Circuit

Application Notes

Application Note 967		How to Minimize Power Dissipation in Li+ Linear Chargers
Application Note 1062		Designing Compact Telecom Power Supplies
Application Note 4033		Programmable Fan Controllers

Reliability Reports

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Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX5021EPA			Active	PDIP(N);8 pin;81.9 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P8-5*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX5021EUA			Active	µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX5021EUA+			Active	µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX5021EUA+T			Active	uMAX;8 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX5021EUA-T			Active	uMAX;8 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX5021EUT+			Active	SOT;6 pin;9 mm² Outline Drawing:21-0058 (PDF) Land Pattern: 90-0175 (PDF) Use pkgcode/variation: U6SN+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX5021EUT+T			Active	SOT;6 pin;9 mm² Outline Drawing:21-0058 (PDF) Land Pattern: 90-0175 (PDF) Use pkgcode/variation: U6SN+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX5021EUT-T			Active	SOT;6 pin;9 mm² Outline Drawing:21-0058 (PDF) Land Pattern: 90-0175 (PDF) Use pkgcode/variation: U6SN-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX5021EVKIT			Active	KIT; Land Pattern: Not Available		See data sheet
MAX5022EPA			Active	PDIP(N);8 pin;81.9 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P8-5*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX5022EPA+			Active	PDIP(N);8 pin;81.9 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX5022EUA			Active	µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX5022EUA+			Active	µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX5022EUA+T			Active	uMAX;8 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX5022EUA-T			Active	uMAX;8 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX5022EUT+			Active	SOT;6 pin;9 mm² Outline Drawing:21-0058 (PDF) Land Pattern: 90-0175 (PDF) Use pkgcode/variation: U6SN+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX5022EUT+T			Active	SOT;6 pin;9 mm² Outline Drawing:21-0058 (PDF) Land Pattern: 90-0175 (PDF) Use pkgcode/variation: U6SN+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX5022EUT-T			Active	SOT;6 pin;9 mm² Outline Drawing:21-0058 (PDF) Land Pattern: 90-0175 (PDF) Use pkgcode/variation: U6SN-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

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Evaluation Kits

MAX5022EVKIT

Evaluation Kit for the MAX5022

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