Diodes Incorporated

AZ494C (Obsolete)

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The AZ494A/C is a voltage mode pulse width modulation switching regulator control circuit designed primarily for power supply control. The AZ494A/C consists of a reference voltage circuit, two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, and an output control circuit. The precision of voltage reference (VREF) is improved up to ± 1% through trimming and this provides a better output voltage regulation. The AZ494A/C provides for pushpull or single-ended output operation, which can be selected through the output control. The difference between AZ494A and AZ494C is that they have 4.95V and 5V reference voltage respectively.


  • Stable 4.95V/5V Reference Voltage Trimmed to ±1.0% Accuracy
  • Uncommitted Output TR for 200mA Sink or Source Current
  • Single-End or Push-Pull Operation Selected by Output Control
  • Internal Circuitry Prohibits Double Pulse at Either Output
  • Complete PWM Control Circuit with Variable Duty Cycle
  • On-Chip Oscillator with Master or Slave Operation


  • SMPS
  • Back Light Inverter
  • Charger

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2594 2022-08-31 2023-02-28 Device End of Life (EOL)
PCN-2481 2020-08-26 2021-02-26 Device End of Life (EOL)