LM2651

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LM2651 Description

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LM2651 Datasheet (PDF)

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LM2651 Features

• Ultra high efficiency up to 97%
• High efficiency over a 1.5A to milliamperes load range
• 4V to 14V input voltage range
• 1.8V, 2.5V, 3.3V, or ADJ output voltage
• Internal MOSFET switch with low R_DS(on) of 75m
• 300kHz fixed frequency internal oscillator
• 7ľA shutdown current
• Patented current sensing for current mode control
• Input undervoltage lockout
• Adjustable soft-start
• Current limit and thermal shutdown
• 16-pin TSSOP package

LM2651 Description

The LM2651 switching regulator provides high efficiency power conversion over a 100:1 load range (1.5A to 15mA). 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 keep the efficiency high. In many applications, the efficiency still exceeds 80% at 15mA load. A shutdown pin is available to disable the LM2651 and reduce the supply current to less than 10ľA.

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.

LM2651 Parameters

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