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
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
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