MAX5053A, MAX5053B

Current-Mode PWM Controllers with an Error Amplifier for Isolated/Nonisolated Power Supplies

Isolated/Nonisolated Current-Mode PWM Controllers Work with Universal Offline, Telecom, or 12V Input Voltage

Please check latest availability status for a specific part variant.


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.

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 MAX5052A/MAX5053A are offered with a 50% maximum duty-cycle limit. The MAX5052B/MAX5053B are offered with a 75% maximum duty-cycle limit. These devices are available in 8-pin µMAX packages and operate over the -40°C to +85°C temperature range.
MAX5052, MAX5053: Typical Operating Circuit MAX5052, MAX5053: Typical Operating Circuit Enlarge+

Key Features

  • Available in a Tiny 8-Pin µMAX Package
  • Current-Mode Control
  • 50W Output Power
  • Universal Offline Input Voltage Range
    • Rectified 85VAC to 265VAC (MAX5052)
  • VIN 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
Part NumberApplication (VIN)VIN
Duty Cycle
Gate Drive Current
Oper. Temp.
minmaxmaxmaxmaxmaxSee Notes
Networking (48V)
Power Over Ethernet (32-58V)
Telecom (36-72V)
Universal Off-line (90-240VAC)
Single-Ended Forward
0.0451.41-40 to +85
$0.88 @1k
Base Station (24V)
Industrial (24V)
$0.99 @1k
See All Isolated Power Supplies (25)
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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX5052AEVKIT: Evaluation Kit for the MAX5052A

Quality and Environmental Data

Request Reliability Report for: MAX5053A  MAX5053B 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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