Diodes Incorporated
SO 8EP

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AP65453 (Obsolete)

4A, 18V, 650KHZ ADAPTIVE COT STEP-DOWN CONVERTER

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Description

The AP65453 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 AP65453 features programmable soft-start, UVLO, OTP, high voltage tolerance EN pin and OCP to protect the circuit.

This IC is available in SO-8EP package.

Feature(s)

  • 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
  • High Voltage Tolerance EN Pin
  • Built-in Thermal Shutdown Protection
  • Programmable Soft-Start
  • Pre-Biased Start-up

Application(s)

  • Point of Load Power
  • STB
  • LCD-TV
  • Coffee Machines
  • Power Supplies
  • Monitors
  • Communications

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Standard
Efficiency (%) 94
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) 4
Output Current (A) 4
Output Voltage (V) 0.76 to 6
Quiescent Current Typ (mA) 0.9
Quiescent Current Typ (µA) 900
Shutdown Current Typ (µA) 3.6
Shutdown Current Typ (µA) 3.6
Type Buck

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TN1.pdf