LM2651

1.5A 高效开关稳压器

The 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.

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Ultrahigh Efficiency up to 97%

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High-Efficiency Over a 1.5-A to 1.5-mA Load

Range

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4-V to 14-V Input Voltage Range

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1.8-V, 2.5-V, 3.3-V, or ADJ Output Voltage

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Internal MOSFET Switch With Low RDSon of

75 mΩ

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300-kHz Fixed Frequency Internal Oscillator

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7-µA Shutdown Current

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Patented Current Sensing for Current Mode

Control

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Input Undervoltage Lockout

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Adjustable Soft-Start

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Current Limit and Thermal Shutdown

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16-Pin TSSOP Package

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