LM2675

SIMPLE SWITCHER® 6.5V 至 40V、1A 高效降压稳压器

The series of regulators are monolithic integrated DC-DC converter circuits built with a LMDMOS process. These regulators provide all the active functions for a step-down buck switching regulator, capable of driving a 1-A load current with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, and an adjustable output version.

Requiring a minimum number of external components, these regulators are simple to use and include patented internal frequency compensation and a fixed frequency oscillator.

The LM2675 series operates at a switching frequency of 260 kHz, thus allowing smaller-sized filter components than what would be needed with lower frequency switching regulators. Because of its very high efficiency >90%, the copper traces on the printed-circuit board are the only heat sinking needed.

A family of standard inductors for use with the LM2675 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies using these advanced ICs. Also included in the data sheet are selector guides for diodes and capacitors designed to work in switch-mode power supplies.

Other features include ±1.5%-tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring typically 50-µA standby current. The output switch includes current limiting, as well as thermal shutdown for full protection under fault conditions.

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Efficiency up to 96%

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Available in 8-Pin SOIC, PDIP, and 16-Pin WSON

Package

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Requires only 5 External Components

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3.3-V, 5-V, 12-V, and Adjustable Output Versions

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Adjustable Version Output Voltage Range: 1.21 V

to 37 V

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±1.5% Maximum Output Voltage Tolerance Over

Line and Load Conditions

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Ensured 1-A Output Load Current

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Wide Input Voltage Range: 8 V to 40 V

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260-kHz Fixed Frequency Internal Oscillator

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TTL Shutdown Capability, Low-Power Standby

Mode

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Thermal Shutdown and Current Limit Protection