Diodes' AP65251 is an adaptive constant on-time (aCOT) mode synchronous buck converter providing high efficiency and excellent transient response. The AP65251 incorporates a control algorithm that improves efficiency at light loads. The aCOT control scheme handles wide input to output voltage ratios and requires minimal external component count. The AP65251 could seamlessly transition between continuous conduction mode (CCM) at high loading and discontinuous conduction mode (DCM) when the inductor current is less than 0 A for high efficiency. The AP65251 switching frequency is fixed at 500 kHz and undervoltage lockout (UVLO), overtemperature protection (OTP), and overcurrent protection (OCP) to protect the circuit. The AP65251 is available in TSOT26 package providing a high-power density leaded solution.

Features

• 500 kHz fixed frequency aCOT converter with HLLE improves transient response with increased efficiency in light-load conditions
• Multiple protection levels
  • OCP
  • OVP
  • Thermal shutdown
  • UVLO
• Small footprint leaded TSOT26 package
  • Saves PCB spacing and cost in an industry standard pin-out
• Improves robustness of circuit and prevents premature failure