LM3673

2MHz、350mA 降压 DC-DC 转换器

The step-down DC-DC converter is optimized for powering low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7 V to 5.5 V. It provides up to 350-mA load current over the entire input voltage range. There are several different fixed voltage output options available, as well as an adjustable output voltage version ranging from 1.1 V to 3.3 V.

The device offers superior features and performance for mobile phones and similar portable systems. The LM3673 uses intelligent automatic switching between pulse width modulation PWM and pulse frequency modulation PFM for better efficiency. During PWM mode, the device operates at a fixed-frequency of

2 MHz typical. Hysteretic PFM mode extends the battery life by reducing the quiescent current to 16 µA typical during light load and standby operation. Internal synchronous rectification provides high efficiency during PWM mode operation. In shutdown mode, the device turns off and reduces battery consumption to 0.01 µA typical.

The LM3673 is available in a tiny 5-pin DSBGA package. A high switching frequency of 2 MHz typical allows the use of three tiny surface-mount components: an inductor and two ceramic capacitors.

For all available packages, see the orderable addendum at the end of the data sheet.

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16-µA Typical Quiescent Current

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350-mA Maximum Load Capability

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2-MHz PWM Fixed Switching Frequency Typical

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Automatic PFM/PWM Mode Switching

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Available in Fixed and Adjustable Output Voltages

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Internal Synchronous Rectification for High Efficiency

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Internal Soft Start

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0.01-µA Typical Shutdown Current

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Operates From a Single Li-Ion Cell Battery

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Current Overload and Thermal Shutdown Protection

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Only Three Tiny Surface-Mount External Components Required One Inductor, Two Ceramic Capacitors