MAX5052, MAX5052A, MAX5052B, MAX5053, MAX5053A, MAX5053B Current-Mode PWM Controllers with an Error Amplifier for Isolated/Nonisolated Power Supplies

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The MAX5052/MAX5053 current-mode PWM controllers contain all the control circuitry required for the design of wide-input-voltage isolated and nonisolated power supplies. The MAX5052 is well suited for universal input (rectified 85VAC to 265VAC) or telecom (-36VDC to -72VDC) power supplies. The MAX5053 is well suited for low-input-voltage (10.8VDC to 24VDC) power supplies.

The MAX5052/MAX5053 contain an internal error amplifier that regulates the tertiary winding output voltage. This implements a primary-side regulated, isolated power supply, eliminating the need for an optocoupler. An input undervoltage lockout (UVLO) is provided for programming the input-supply start voltage and to ensure proper operation during brownout conditions. The input-supply start voltage is externally programmable with a voltage-divider. To shutdown the device, the UVLO pin is pulled low. Internal digital soft-start reduces output voltage overshoot. The internal thermal shutdown circuit protects the device in the event the junction temperature exceeds +130°C.

The MAX5052 has an internal bootstrap UVLO with large hysteresis that requires a minimum voltage of 23.6V for startup. The MAX5053 does not have the internal bootstrap UVLO and can be biased directly from a minimum voltage of 10.8V.

Key Features

Applications/Uses

Available in a Tiny 8-Pin µMAX Package
Current-Mode Control
50W Output Power
Universal Offline Input Voltage Range
- Rectified 85VAC to 265VAC (MAX5052)
V_IN Directly Driven from 10.8V to 24V Input (MAX5053)
Digital Soft-Start
Programmable Input Startup Voltage
Internal Bootstrap UVLO with Large Hysteresis (MAX5052)
Internal Error Amplifier with 1% Accurate Reference
Thermal Shutdown
45µA (typ) Startup Supply Current
1.4mA (typ) Operating Supply Current
Fixed Switching Frequency of 262kHz ±12%
50% Maximum Duty-Cycle Limit (MAX5052A/MAX5053A)
75% Maximum Duty-Cycle Limit (MAX5052B/MAX5053B)
60ns Cycle-by-Cycle Current-Limit Response Time

	12V Boost Regulators
	12V SEPIC Regulators
	Computer Systems/Servers
	Industrial Power Conversion
	Isolated Keep-Alive Circuits
	Isolated Telecom Power Supplies
	Networking Systems
	Power Supplies
	Universal Input AC

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

RoHS Available

Package

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

Operating Temp. Range (°C)

Price^*

MAX5052

•	Networking (48V)

•	Power Over Ethernet (32-58V)

•	Telecom (36-72V)

•	Universal Off-line (90-240VAC)

21.6

375

Flyback
Single-Ended Forward

•	High Voltage Start-Up Circuit

•	Internal Error Amplifier

•	Thermal Shutdown

•

UVLO

Current Mode

Linear
Opto

262

50
75

0.045

1.4

291

Yes

uMAX/8

-40 to +85

$0.66 @ 1k

MAX5053

•	Base Station (24V)

•	Industrial (24V)

10.8

$0.66 @ 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.