LM27341

1.5A - 具有频率同步的宽输入范围降压稳压器

The LM2734x and LM2734x-Q1 regulators are monolithic, high-frequency, PWM step-down DC-DC converters in 10-pin WSON and 10-pin MSOP-PowerPAD packages. They contain all the active functions to provide local DC-DC conversion with fast transient response and accurate regulation in the smallest possible PCB area.

With a minimum of external components, the LM2734x and LM2734x-Q1 are easy to use. The ability to drive 1.5-A or 2-A loads respectively, with an internal 150-mΩ NMOS switch results in the best power density available. The world-class control circuitry allows for on-times as low as 65 ns, thus supporting exceptionally high frequency conversion. Switching frequency is internally set to 2 MHz and synchronizable from 1 to 2.35 MHz, which allows the use of extremely small surface mount inductors and chip capacitors. Even though the operating frequency is very high, efficiencies up to 90% are easy to achieve. External shutdown is included, which features an ultra-low shutdown current of 70 nA. The LM2734x and LM2734x-Q1 use peak 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 inrush current, pulse-by-pulse current limit, thermal shutdown, and output overvoltage protection.

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Space-Saving, 3 mm × 3 mm 10-Pin WSON and MSOP-PowerPAD Packages

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Wide Input Voltage Range: 3 V to 20 V

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Wide Output Voltage Range: 1 V to 18 V

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Delivers 1.5-A Maximum Output Current

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LM27342 Delivers 2-A Maximum Output Current

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High Switching Frequency: 2 MHz

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Frequency Synchronization:

1 MHz < fSW < 2.35 MHz

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150-mΩ NMOS Switch With Internal Bootstrap Supply

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70-nA Shutdown Current

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Internal Voltage Reference Accuracy of 1%

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Peak Current-Mode, PWM Operation

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Thermal Shutdown

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LM27341-Q1 and LM27342-Q1 are AEC-Q100 Grade 1 Qualified and Manufactured on an Automotive Grade Flow