LOWPOWER LP6451AB6F

The LP6451X is a synchronous buck converter supporting up to 3A output current. The LP6451X employs an adaptive constant-on-time (COT) control scheme to achieve fast load transient response. The external components are minimized, requiring only one inductor, two resistors, and two capacitors. The LP6451X supports both aluminum polymer capacitors and ceramic capacitors without extra compensation components. The LP6451X integrates PFM (Pulse Frequency Modulation) operation, which helps maintain the system efficiency at light load while the LP6451XF works in FPWM mode to achieve low output covering all load range. The LP6451X also integrates multiple protection functions, i.e., over-current protection (OCP), over-temperature protection (OTP), under-voltage lockout (UVLO), and short circuit protection (SCP). The LP6451X is available in a small 6-pin 1.6mm×2.9mm SOT23-6 package.

The LP6451X is a 3A synchronous buck converter, supporting 4.2-18V input voltage range. The adaptive COT control scheme enables fast transient respond and minimizes the output capacitance. The LP6451X supports both aluminum polymer capacitors and low-ESR ceramic capacitors without external compensation circuit. The LP6451X automatically transfers between PFM and PWM according to the output current.

• Wide input voltage range: 4.2V – 18V
• Output voltage range: Vref – 7V
• High efficiency operation - Integrated a 45mΩ LS-MOSFET and a 65mΩ HSMOSFET - 91% efficiency at 3A load from 12V to 5V conversion
• Automatic PFM mode at light load (LP6451X)
• ±2% Vref accuracy at room temperature
• Typical 1.2-MHz switching frequency
• COT control scheme with fast load transient response
• Hiccup protection
• Integrated UVLO, OVP, OCP, SCP, and OTP protections
• 1.25ms typical soft-start time
• 1.6mm × 2.9mm SOT23-6 package
• RoHS Compliant and 100% Lead (Pb) Free

• Industrial PC
• Network/digital video recorder (NVR/DVR)
• TV and TV box
• 12V Industrial bus applications