LM2677 Adjustable 5A Step-Down Voltage Regulator – Datasheet

The LM2677 regulator is a monolithic integrated circuit that provides all of the active functions for a stepdown (buck) switching regulator capable of driving up to 5A 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 LM2677 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.

LM2677 Pinout

LM2677 Pin Configuration

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

LM2677 Key Features

• 100 mΩ DMOS output switch
• 3.3V, 5V and 12V fixed output and adjustable (1.2V to 37V ) versions
• 50µA standby current when switched OFF
• ±2%maximum output tolerance over full line and load conditions
• Wide input voltage range: 8V to 40V
• External Sync clock capability (280KHz to 400KHz)
• 260 KHz fixed frequency internal oscillator
• −40 to +125˚C operating junction temperature range

Application

• Simple to design, high efficiency (>90%) step-down switching regulators
• Efficient system pre-regulator for linear voltage regulators
• Battery chargers
• Communications and radio equipment regulator with synchronized clock frequency

You can download this datasheet for LM2677 Adjustable 5A Step-Down Voltage Regulator – Datasheet from the link given below: