Overview

Features and Benefits

  • 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

Product Details

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.

Applications

  • 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

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Product Recommendations

MAX5053 Companion Parts

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Design Resources

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.

PCN-PDN Information

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