.01

.1

1

10

.001

.01

.1

1

10

SOURCING CURRENT (mA)

VCC= 12V

-40°C

+25°C

+85°C

+125°C

.01

.1

1

10

.001

.01

.1

1

10

SINKING CURRENT (mA)

VCC= 12V

-40°C

+25°C

+85°C

+125°C

.01

.1

1

10

.001

.01

.1

1

10

SINKING CURRENT (mA)

VCC= 5V

-40°C

+25°C

+85°C

+125°C

.01

.1

1

10

.001

.01

.1

1

10

SOURCING CURRENT (mA)

VCC= 5V

-40°C

+25°C

+85°C

+125°C

LMP8480, LMP8481

SNVS829A – JUNE 2012 – REVISED AUGUST 2012

www.ti.com

Typical Performance Characteristics (continued)

gain options.

Saturated Output Sourcing Current at 4.5V

Saturated Output Sinking Current at 4.5V

Saturated Output Sourcing Current at 12V

Saturated Output Current Sinking at 12V

Application Information

LMP8480 AND LMP8481 INTRODUCTION

The LMP8480 and LMP8481 are single supply, high side current sense amplifiers with available fixed gains of

x20, x50, x60 and x100. The power supply range is 4.5V to 76V, while the common mode input voltage range is

capable of 4.0V to 76V operation. The supply voltage and common mode range are completely independent of

each other. This makes the LMP848x supply voltage extremely flexible, as the LMP848x's supply voltage can be

greater than, equal to, or less than the load source voltage, and allowing the device to be powered from the

system supply or the load supply voltage.

The amplifier supply voltage does not have to be larger than the load source voltage. A 76V load source voltage

with a 5V LMP8481 supply voltage is perfectly acceptable.

THEORY OF OPERATION

The LMP8480 and LMP8481 are comprised of two main stages. The first stage is a differential input current to

voltage converter, followed by a differential voltage amplifier and level-shifting output stage. Also present is an

internal 14 Volt Low Dropout Regulator (LDO) to power the amplifiers and output stage, as well as a reference

divider resistor string to allow the setting of the reference level.

10

Submit Documentation Feedback

Copyright © 2012, Texas Instruments Incorporated

Product Folder Links: LMP8480 LMP8481