LM2670 5V 3A Step-Down Voltage Regulator with Sync

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The LM2670 regulator is a monolithic integrated circuit that provides all of the active functions for a step-down (buck) switching regulator capable of driving up to 3A loads with excellent line and load regulation characteristics. High efficiency (>90%) is obtained through the use of a low ON-resistance DMOS power switch. The series consists of fixed output voltages of 3.3V, 5V, and 12V and an adjustable output version. The simple switcher concept provides for a complete design using a minimum number of external components.

The switching clock frequency can be provided by an internal fixed frequency oscillator (260KHz) or from an externally provided clock in the range of 280KHz to 400Khz, allowing the use of physically smaller-sized components. A family of standard inductors for use with the LM2670 are available from several manufacturers to greatly simplify the design process. The external Sync clock provides direct and precise control of the output ripple frequency for consistent filtering or frequency spectrum positioning.

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LM2670 Pinout

LM2670 Pin Configuration

Pin No	Pin Name	Description
1	SWITCH OUTPUT	Switch Output Pin
2	IN	Input Pin
3	C BOOST	Capacitor Boost Pin
4	GND	Ground Pin
5	SYNC	Synchronous Pin
6	FB	FeedBack Pin
7	ON/OFF’	On/Complement Off Pin