MP8110DK-LF-Z Datasheet MP8110DS-LF-Z, MP8110DK-LF-Z, MP8110DK-LF-P | P1-P3

MP8110

Precision High-Side

Current-Sense Amplifier

MP8110 Rev. 0.9 www.MonolithicPower.com 1

9/21/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

The Future of Analog IC Technology

DESCRIPTION

The MP8110 is a low-cost, precision, high-side

current-sense amplifier. This device operates

from a single 2.5V to 40V supply and typically

consumes 12µA. It is ideal for today’s notebook

computers, cell phones and other systems

where battery/DC current monitoring is critical.

High-side current monitoring is especially useful

in battery-powered systems since it does not

interfere with the ground path of the battery

charger. The input common-mode range of

1.4V to 40V is independent of the supply

voltage and ensures that the current-sense

feedback remains viable even when connected

to a 2-cell battery pack in deep discharge.

This device is available in 8-pin SOIC and

MSOP packages.

FEATURES

• Low-Cost, Compact Current-Sense Solution

• 12µA Typical Supply Current

• 2.5V to 40V Operating Supply Voltage

• 1.4V to 40V Input Common Mode Range

• 3µA Typical Shutdown Current

• 400µV Input Offset Voltage

• High Current Sensing Capability

• Integrated Buffer Amplifier

• Available in 8-Pin SOIC and MSOP packages,

APPLICATIONS

• Portable PCs

• PDA’s

• Smart Battery Packs

• Cell Phones

• Portable Test/Measurement Systems

• Battery-Operated Systems

• Energy Management Systems

“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

MP8110

RG1

VCC

SHDN

GND

RG2

OUT2

OUT1

C

OUT

Opt.

C

GS

100pF

V

IN

+

10uF

0.1uF

SHUTDOWN

ON

OFF

C

5

I

LOAD

MP8110 – PRECISION HIGH-SIDE CURRENT-SENSE AMPLIFIER

MP8110 Rev. 0.9 www.MonolithicPower.com 2

9/21/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

PACKAGE REFERENCE

SHDN

NC

RG1

GND

OUT2

VCC

RG2

OUT1

1

2

3

4

8

7

6

5

TOP VIEW

Part Number* Package Temperature

MP8110DS SOIC8

–40°C to +85°C

*

For Tape & Reel, add suffix –Z (eg. MP8110DS–Z)

For RoHS Compliant Packaging, add suffix –LF

(eg. MP8110DS–LF–Z)

ABSOLUTE MAXIMUM RATINGS

(1)

VCC, RG1, RG2 to GND..............–0.3V to +42V

Max Differential Input Voltage, RG1 to RG2..... 5V

Max Junction Temperature (T

j

) ................150°C

Storage Temperature ............. –65°C to +150°C

Recommended Operating Conditions

(2)

V

CC

, RG1, RG2 to GND ...................2.5V to 40V

Operating Ambient Temperature–40°C to +85°C

SHDN

NC

RG1

GND

OUT2

VCC

RG2

OUT1

1

2

3

4

8

7

6

5

TOP VIEW

Part Number* Package Temperature

MP8110DK MSOP8

–40°C to +85°C

*

For Tape & Reel, add suffix –Z (eg. MP8110DK–Z)

For RoHS Compliant Packaging, add suffix –LF

(eg. MP8110DK–LF–Z)

Thermal Resistance

(3)

θ

JA

θ

JC

SOIC8..................................... 90 ...... 42... °C/W

MSOP8 .................................. 150 ..... 65... °C/W

Continuous Power Dissipation

(T

A

=70°C) ...............................................800mW

Notes:

1) Exceeding these ratings may damage the device.

2) The device is not guaranteed to function outside of its

operating conditions.

3) Measured on approximately 1” square of 1 oz copper.

ELECTRICAL CHARACTERISTICS

V

CC

= 24V, V

SHDN

= 0V, T

A

= +25°C, unless otherwise noted.

Parameter Symbol Conditions Min Typ Max Units

Supply Voltage V

CC

2.5 40 V

Supply Current I

CC

I

LOAD

= 0A, V

CC

= 40V 12 30 µA

Common Mode Input Voltage V

IN_CM

V

CC

> V

IN

Low 1.4 V

V

CC

> V

IN

High 40

OUT1 Input Offset Voltage V

OS1

0.4 2 mV

OUT2 Input Offset Voltage V

OS2

1 5 mV

Input Bias Current

(4)

I

RG1

, I

RG2

4 20 nA

OUT1 Current Accuracy I

RG1

/I

GS

V

SENSE

= 100mV ±2 ±5 %

No-Load OUT1 Error V

SENSE

= 0V 0.1 1 µA

Low-Level OUT1 Error V

SENSE

= 5mV 0.3 2 µA

No-Load OUT2 Error V

SENSE

= 0V 0.01 1 µA

Low-Level OUT2 Error V

SENSE

= 5mV 0.05 2 µA

Power Supply Rejection Ratio PSRR

2.5V < V

CC

< 40V,

V

SENSE

= 100mV

70 97 dB

Shutdown Supply Current I

CC(SHDN)

V

SHDN

= 3V 3 6 µA

MP8110 – PRECISION HIGH-SIDE CURRENT-SENSE AMPLIFIER

MP8110 Rev. 0.9 www.MonolithicPower.com 3

9/21/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

ELECTRICAL CHARACTERISTICS (continued)

V

CC

= 24V, V

SHDN

= 0V, T

A

= +25°C, unless otherwise noted.

Parameter Symbol Conditions Min Typ Max Units

SHDN Threshold Voltage V

TH_SHUTDOWN

(Low - High) 0.7 0.9 1.2 V

SHDN Hysteresis 30 mV

t

R

17 µs

OUT1 Rise, Fall Time

(4)

t

F

V

SENSE

= 40mV,

R

GS

= 20kΩ,

R

OUT

= 100kΩ,

R

G1

= R

G2

= 2kΩ,

C

GS

= 100pF,

C

OUT

= 100pF, 10% to 90%

29

t

R

18 µs

OUT2 Rise, Fall Time

(4)

t

F

V

SENSE

= 40mV,

R

GS

= 20kΩ,

R

OUT

= 100kΩ,

R

G1

= R

G2

= 2kΩ,

C

GS

= 100pF,

C

OUT

= 100pF, 10% to 90%

26

OUT1 Output Voltage

Range

V

GS

V

CC

– 0.15 24 V

OUT2 Output Voltage

Range

V

OUT

V

CC

– 1 24 V

Maximum OUT1 Current

(4)

I

GS

500 µA

Maximum OUT2 Current

(4)

I

OUT2

5 mA

Notes:

4) Guaranteed by design.

5) Input common mode range cannot exceed the supply voltage.

PIN FUNCTIONS

SOIC8 Name Description

1 SHDN

Shutdown. Connect to ground for normal operation. When high, supply current is less

than 3µA.

2 NC Not Connected.

3 RG1

Gain Resistor. Connect to battery side of current-sense resistor through the gain

resistor.

4 GND Ground or Battery Negative Terminal.

5 OUT1 Output for Driving Resistor Load.

6 RG2

Gain Resistor. Connect to load side of current-sense resistor through the gain

resistor.

7 VCC Power Input. Connect to Battery Input.

8 OUT2 Output For Driving Capacitive Loads.

MP8110DK-LF-Z

MP8110DK-LF-Z

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