Diodes Incorporated
U DFN3030 10

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AP65455 (Obsolete)

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The AP65455 is an adaptive constant on-time mode synchronous buck converter providing high efficiency, excellent transient response and high DC output accuracy for low-voltage regulation in digital TV and monitor. The constant-on-time control scheme handles wide input/output voltage ratios and provides low external component count. The internal proprietary circuit enables the device to adopt both low equivalent series resistance (ESR) output capacitors, such as SP-CAP or POSCAP and ultra-low ESR ceramic capacitors. The AP65455 features programmable soft-start, UVLO, OTP, high voltage tolerance EN pin, Power Good and OCP to protect the circuit. This IC is available in DFN3030-10 package.


  • Fixed Frequency Emulated Constant On-time Control
  • Good Stability Independent of the Output Capacitor ESR
  • Fast Load Transient Response
  • Synchronous Rectification: 90mΩ Internal High-side Switch and 57mΩ Internal Low-side Switch
  • Wide Input Voltage Range: 4.5V to 18V
  • Output Voltage Range: 0.76V to 6V
  • 4A Continuous Output Current
  • 650kHz Switching Frequency
  • Built-in Over Current Limit
  • Support Power Good Pin
  • High Voltage Tolerance EN pin
  • Built-in Thermal Shutdown Protection
  • Programmable Soft-start
  • Pre-biased Start-up


Point of Load power

Product Specifications

Product Parameters

Efficiency (%) 94
Frequency Typ (Hz) 650
HS RDS(ON) (mΩ) 90
LS RDS(ON) (mΩ) 57
MaximumInput Voltage (V) N/A
MinimumInput Voltage (V) 4.5
Output Current (mA) N/A
Output Voltage (V) 0.76 to 6
Quiescent Current Typ (mA) 0.6
Shutdown Current Typ (µA) 1
Type Buck

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