MAX5021, MAX5022 Current-Mode PWM Controllers for Isolated Power Supplies

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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.

Key Features

Applications/Uses

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

	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

Application (Nominal Input Voltage)

V_IN (min) (V)

V_IN (max) (V)

Topology

Features

Control Loop

Feedback Type

Frequency (kHz)

Max. Duty Cycle (%)

Start-Up Current (max) (mA)

Operating Current, I_CC (max) (mA)

Gate Drive Current (A)

Current Sense Threshold (mV)

EV-Kit

Package

Smallest Available Package (max w/pins) (mm²)

RoHS Available

Operating Temp. Range (°C)

Price^*

MAX5021

•	Networking (48V)

•	Power Over Ethernet (32-58V)

•	Telecom (36-72V)

•	Universal Off-line (90-240VAC)

375

Single-Ended Forward

•	High Voltage Start-Up Circuit

•	Thermal Shutdown

•

UVLO

Current Mode

Opto

262

0.085

2.43

0.25

600

PDIP/8
SOT-23/6
uMAX/8

Yes

-40 to +85

$0.79 @ 1k

MAX5022

Flyback

$0.70 @ 1k

See All Isolated Power Supplies (29)

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.