描述 Description

The LM2651 switching regulator provides high-efficiency power conversion over a 100:1 load range (1.5 A to 15 mA). This feature makes the LM2651 an ideal fit in battery-powered applications that demand long battery life in both run and standby modes.
Synchronous rectification is used to achieve up to 97% efficiency. At light loads, the LM2651 enters a low power hysteretic or sleep mode to maintain high efficiency. In many applications, the efficiency still exceeds 80% at 15-mA load. A shutdown pin is available to disable the LM2651 and reduce the supply current to less than 10 μA.
The LM2651 contains a patented current sensing circuitry for current mode control. This feature eliminates the external current sensing resistor required by other current-mode DC-DC converters.
The LM2651 has a 300-kHz fixed frequency internal oscillator. The high oscillator frequency allows the use of extremely small, low-profile components.
A programmable soft-start feature limits current surges from the input power supply at start-up and provides a simple means of sequencing multiple power supplies.
Other protection features include input undervoltage lockout, current limiting, and thermal shutdown.

特性 Features

? Ultrahigh Efficiency up to 97%
? High-Efficiency Over a 1.5-A to 1.5-mA Load Range
? 4-V to 14-V Input Voltage Range
? 1.8-V, 2.5-V, 3.3-V, or ADJ Output Voltage
? Internal MOSFET Switch With Low RDS(on) of 75 mΩ
? 300-kHz Fixed Frequency Internal Oscillator
? 7-μA Shutdown Current
? Patented Current Sensing for Current Mode Control
? Input Undervoltage Lockout
? Adjustable Soft-Start
? Current Limit and Thermal Shutdown
? 16-Pin TSSOP Package