AP65455 / AP65355 3 A / 4 A Buck Converters

By Diodes Incorporated 54

AP65455 / AP65355 3 A / 4 A Buck Converters

Diodes' AP65355 / AP65455 are adaptive constant on-time (aCOT) mode synchronous buck converters providing high-efficiency, excellent transient response, and high DC-output accuracy for voltage regulation in digital TVs and monitors.

The aCOT control scheme handles wide input/output voltage ratios and provides a low external component count. The AP65355 / AP65455 supports a seamless transition between continuous conduction mode (CCM) at higher load conditions and discontinuous conduction mode (DCM) at lighter-load conditions for high efficiency.

The AP65355 / AP65455 operates at a fixed 650 KHz to achieve good output stability. These devices also feature programmable soft-start, UVLO, OTP, high-voltage tolerance EN Pin and OCP to protect the circuit. The AP65355 / AP65455 are available in DFN3030-10.

Features
  • Fixed frequency emulated constant on-time control
  • Good stability independent of the output capacitor ESR
  • Fast load transient response
  • Synchronous rectification: 90 mΩ internal high-side switch and 57 mΩ internal low-side switch
  • Wide input voltage range: 4.5 V to 18 V
  • Output voltage range: 0.76 V to 6 V
  • 3 A / 4 A continuous output current
  • 650 kHz switching frequency
  • Built-in over current limit
  • Built-in over voltage protection
  • Built-in thermal shutdown protection
  • Programmable soft-start
  • Pre-biased start-up
  • Totally lead-free and fully RoHS-compliant
  • Halogen- and antimony-free: “green” device
Applications    
  • Game consoles
  • TVs and Monitors
  • Set-top boxes
  • Network systems
 
  • Distributed power systems
  • Home audios
  • Consumer electronics
  • Green electronics

New Products:

AP65355FN-7AP65455FN-7

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