LM2687 datasheet(1/8 Pages) NSC

tên linh kiện	LM2687

Giải thích chi tiết về linh kiện	Low Noise Regulated Switched Capacitor Voltage

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nhà sản xuất	NSC [National Semiconductor (TI)]

Trang chủ	http://www.national.com

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LM2687

Low Noise Regulated Switched Capacitor Voltage

Inverter

General Description

The LM2687 CMOS Negative Regulated Switched Capacitor

Voltage Inverter delivers a very low noise adjustable output

for an input voltage in the range of +2.7V to +5.5V. Four low

cost capacitors are used in this circuit to provide up to 10mA

of output current. The regulated output for the LM2687 is ad-

justable between −1.5V and −5.2V. The LM2687 operates at

100 kHz (typical) switching frequency to reduce output resis-

tance and voltage ripple. With an operating current of only

500 µA (charge pump power efficiency greater than 90%

with most loads) and 0.05 µA typical shutdown current, the

LM2687 provides ideal performance for cellular phone power

amplifier bias and other low current, low noise negative volt-

age needs. The device comes in a small 8-pin MSOP pack-

age.

Features

n Inverts and regulates the input supply voltage

n Small MSOP-8 package

n 91% typical charge pump power efficiency at 10mA

n Low output ripple (1mV typical)

n Shutdown lowers Quiescent current to 0.05 µA (typical)

Applications

n Wireless Communication Systems

n Cellular Phone Power Amplifier Biasing

n Interface Power Supplies

n Handheld Instrumentation

n Laptop Computers and PDA’s

Typical Application Circuit

Connection Diagram

DS101180-1

8-Pin MSOP

DS101180-2

August 1999

DS101180

www.national.com

Số phần tương tự - LM2687

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Texas Instruments	LM2687LDX	333Kb / 12P	Low Noise Regulated Switched Capacitor Voltage Inverter
	LM2687LDX/NOPB	333Kb / 12P	Low Noise Regulated Switched Capacitor Voltage Inverter
	LM2687MM/NOPB	333Kb / 12P	Low Noise Regulated Switched Capacitor Voltage Inverter
	LM2687MMX/NOPB	333Kb / 12P	Low Noise Regulated Switched Capacitor Voltage Inverter

More results

Mô tả tương tự - LM2687

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Linear Technology	LTC1550	319Kb / 12P	Low Noise, Switched Capacitor Regulated Voltage Inverters
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National Semiconductor ...	LM2787	214Kb / 8P	Low Noise Regulated Switched Capacitor Voltage
Texas Instruments	LM2687LDX	333Kb / 12P	Low Noise Regulated Switched Capacitor Voltage Inverter
Linear Technology	LTC1550L	248Kb / 12P	Low Noise, Switched Capacitor Regulated Voltage Inverters
	LTC1551L	248Kb / 12P	Low Noise, Switched Capacitor Regulated Voltage Inverters
	LTC1550	298Kb / 12P	Low Noise, Switched Capacitor Regulated Voltage Inverters
	LTC1551	298Kb / 12P	Low Noise, Switched Capacitor Regulated Voltage Inverters
Texas Instruments	LM27761	160Kb / 9P	LM27761 Low-Noise Regulated Switched-Capacitor Voltage Inverter
Texas Instruments	LM27761	1Mb / 29P	Low-Noise Regulated Switched-Capacitor Voltage Inverter

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