Diodes Incorporated
SO 16

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AZ494 (Not Recommended for new design)

NRND = Not Recommended for New Design

Voltage Mode Dual Output PWM Controller

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The AZ494 is a voltage mode pulse width modulation switching regulator control circuit designed primarily for power supply control.

The AZ494 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 AZ494 provides for push-pull 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.

The AZ494 is available in standard packages of PDIP-16 and SO-16.


  • 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
  • Totally Lead-Free & Fully RoHS Compliant
  • Halogen and Antimony Free. “Green” Device


  • SMPS
  • Backlight Inverter
  • Charger

Product Specifications

Product Parameters

CTRL Pin High N/A
CTRL Pin Low N/A
Gate OutputCurrent (mA) 250
HV Start-UpCircuit No
Maximum OscillationFrequency (kHz) Adjustable
StartupCurrent (µA) N/A
UVLOThresholdon/off (V) N/A

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Technical Documents

Recommended Soldering Techniques


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-2514 2021-03-09 2021-06-09 Additional Wafer Source JKFAB
PCN-2481 2020-08-26 2021-02-26 Device End of Life (EOL)