Diodes Incorporated
U DFN3030 10

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AP65355 (Obsolete)

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The AP65355 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 AP65355 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
  • 3A 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

Compliance(Only Automotive supports PPAP) Standard
Efficiency (%) 92
Frequency Typ (Hz) 650
Frequency Typ (kHz) 650
HS RDS(ON) (mΩ) 90
HS RDS(ON) (mΩ) 90
LS RDS(ON) (mΩ) 57
LS RDS(ON) (mΩ) 57
MaximumInput Voltage (V) 18
Maximum Input Voltage (V) 18
Maximum Output Voltage (V) 6
MinimumInput Voltage (V) 4.5
Minimum Input Voltage (V) 4.5
Minimum Output Voltage (V) 0.76
Output Current (mA) 3
Output Current (A) 3
Output Voltage (V) 0.76 to 6
Quiescent Current Typ (mA) 0.6
Quiescent Current Typ (µA) 600
Shutdown Current Typ (µA) 1
Shutdown Current Typ (µA) 1
Type Buck

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