供应微源LP6451F 同步BUCK开关变换器

微源半导体 LP6451F SOT23-6 18V/3A同步BUCK开关变换器

General description

The LP6451F is a synchronous buck converter supporting up to 3A output current. The LP6451F 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 LP6451F supports both aluminum polymer capacitors and ceramic capacitors without extra compensation components.
The LP6451F integrates PFM (Pulse Frequency Modulation) operation, which helps maintain the system efficiency at light load. The LP6451F also integrates multiple protection functions, i.e., over-current protection (OCP), overtemperature protection (OTP), under-voltage lockout (UVLO), and short circuit protection (SCP).

Features

● Wide input voltage range: 4.2V – 18V

● Output voltage range: Vref – 7V

● High efficiency operation

Integrated an 75-mΩ LS-MOSFET and an 110-mΩ HS-MOSFET

90% efficiency at 2A load from 12V to 5V conversion

● Automatic PFM mode at light load

● ±1% Vref accuracy

● 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 Χ 2.9mm SOT23-6 package

● RoHS Compliant and 100％ Lead (Pb) Free

Applications

● Industrial PC

● Network/digital video recorder (NVR/DVR)

● TV and TV box

● 12V Industrial bus applications

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