LM2738

550kHz/1.6MHz 1.5A 降压 DC-DC 开关稳压器

The regulator is a monolithic, high-frequency, PWM step-down DC-DC converter in an 8-pin WSON or 8-pin MSOP-PowerPAD package. It provides all the active functions for local DC-DC conversion with fast transient response and accurate regulation in the smallest possible PCB area.

With a minimum of external components, the LM2738 is easy to use. The ability to drive 1.5-A loads with an internal 250-mΩ NMOS switch using state-of-the-art 0.5-µm BiCMOS technology results in the best power density available. Switching frequency is internally set to 550 kHz LM2738Y or 1.6 MHz LM2738X, allowing the use of extremely small surface-mount inductors and chip capacitors. Even though the operating frequencies are very high, efficiencies up to 90% are easy to achieve. External enable is included, featuring an ultralow standby current of 400 nA. The LM2738 utilizes current-mode control and internal compensation to provide high-performance regulation over a wide range of operating conditions. Additional features include internal soft-start circuitry to reduce in-rush current, cycle-by-cycle current limit, thermal shutdown, and output over-voltage protection.

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Space-Saving WSON and MSOP-PowerPAD Packages

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3-V to 20-V Input Voltage Range

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0.8-V to 18-V Output Voltage Range

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1.5-A Output Current

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550-kHz LM2738Y and 1.6-MHz LM2738X Switching Frequencies

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250-mΩ NMOS Switch

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400-nA Shutdown Current

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0.8-V, 2% Internal Voltage Reference

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Internal Soft-Start

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Current-Mode, PWM Operation

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Thermal Shutdown

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