LMC6442

Dual Micropower Rail-to-Rail Output Single Supply

Operational Amplifier

General Description

The LMC6442 is ideal for battery powered systems, where

very low supply current (less than one microamp per ampli-

fier) and Rail-to-Rail output swing is required. It is character-

ized for 2.2V to 10V operation, and at 2.2V supply, the

LMC6442 is ideal for single (Li-Ion) or two cell (NiCad or

alkaline) battery systems.

The LMC6442 is designed for battery powered systems that

require long service life through low supply current, such as

smoke and gas detectors, and pager or personal communi-

cations systems.

Operation from single supply is enhanced by the wide com-

mon mode input voltage range which includes the ground (or

negative supply) for ground sensing applications. Very low

(5fA, typical) input bias current and near constant supply

current over supply voltage enhance the LMC6442’s perfor-

mance near the end-of-life battery voltage.

Designed for closed loop gains of greater than plus two (or

minus one), the amplifier has typically 9.5 KHz GBWP (Gain

Bandwidth Product). Unity gain can be used with a simple

compensation circuit, which also allows capacitive loads of

up to 300 pF to be driven, as described in the Application

Notes section.

For compact assembly the LMC6442 is available in the

MSOP 8 pin package, about one half the size required by the

SOIC 8 pin package. 8 pin DIP and 8 pin SOIC are also

available.

Features

(Typical, V

n

Output Swing to within 30 mV of supply rail

n

High voltage gain

103 dB

n

Gain Bandwidth Product

9.5 KHz

n

Guaranteed for:

2.2V, 5V, 10V

n

Low Supply Current

0.95 µA/Amplifier

n

Input Voltage Range

−0.3V to V

n

2.1 µW/Amplifier

Power consumption

n

Stable for A

V

≥+2 or A

V

≤ −1

Applications

n

Portable instruments

n

Smoke/gas/CO/fire detectors

n

Pagers/cell phones

n

Instrumentation

n

Thermostats

n

Occupancy sensors

n

Cameras

n

Active badges

Connection Diagram

10006440

Top View

August 2000

© 2004 National Semiconductor Corporation

DS100064

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