ANALOG DEVICES ADM4073 Service Manual

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2

V

Low Cost, Voltage Output,

FEATURES

Low cost, compact, current-sense solution
Three available gain versions

20 V/V (ADM4073T)
50 V/V (ADM4073F)

100 V/V (ADM4073H)
Typical ±1.0% full-scale accuracy
500 μA supply current
Wide 1.8 MHz bandwidth
3 V to 28 V operating supply
Wide 2 V to 28 V common-mode range

Independent of supply voltage
Operates from −40°C to +125°C
Available in a 6-lead SOT-23 package
Pin-to-pin compatibility with the MAX4073

APPLICATIONS

Cell phones, PDAs
Notebook computers
Portable/battery-powered systems
Smart battery packs/chargers
Automotive
Power management systems
PA bias control
General system/board-level current monitoring
Precision current sources

High-Side, Current-Sense Amplifier

ADM4073

FUNCTIONAL BLOCK DIAGRAM

I

LOAD

R

RS+

RG1

ADM4073

CURRENT

MIRROR

I

RGD

GND

SENSE

I

RG1

AV

RS–

RG2

RGD = 12kΩ

2V TO 28V

3V TO 28V

0.1µF

V

CC

Figure 1.

APPLICATION DIAGRAM

R

V TO 28

3V TO 28V

0.1µF

SENSE

RS+

V

CC

ADM4073

RS–

OUT

V

OUT

ADC

V

OUT

05131-003

V

OUT

GENERAL DESCRIPTION

The ADM4073 is a low cost, high-side, current-sense amplifier
ideal for small portable applications such as cell phones,
notebook computers, PDAs, and other systems where current
monitoring is required. The device is available in three different
gain models, eliminating the need for gain-setting resistors.
Because the ground path is not interrupted, the ADM4073 is
particularly useful in rechargeable battery-powered systems,
while its wide 1.8 MHz bandwidth makes it suitable for use
inside battery-charger control loops. The input common-mode
range of 2 V to 28 V is independent of the supply voltage.

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.

GND

Figure 2.

The voltage on the output pin is determined by the current
flowing through the selectable external sense resistor and the
gain of the version selected. The operating range is 3 V to 28 V
with a typical supply current of 500 μA. The ADM4073 is
available in a 6-lead SOT-23 package and is specified over the
automotive operating temperature range (−40°C to +125°C).

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] ©2006 Analog Devices, Inc. All rights reserved.

05131-001

ADM4073

TABLE OF CONTENTS

Features.............................................................................................. 1

ESD Caution...................................................................................4

Applications....................................................................................... 1

Functional Block Diagram .............................................................. 1

Application Diagram........................................................................ 1

General Description ......................................................................... 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

Absolute Maximum Ratings............................................................ 4

Thermal Characteristics .............................................................. 4

REVISION HISTORY

7/06—Revision 0: Initial Version

Pin Configuration and Function Descriptions..............................5

Typical Performance Characteristics..............................................6

Theory of Operation ...................................................................... 10

R

............................................................................................. 10

SENSE

Output (OUT)............................................................................. 10

Outline Dimensions....................................................................... 11

Ordering Guide .......................................................................... 11

Rev. 0 | Page 2 of 12

ADM4073

SPECIFICATIONS

V

= 2 V to 28 V, V

RS+

SENSE

= (V

RS+

− V

) = 0, VCC = 3 V to 28 V, TA = −40°C to +125°C, unless otherwise noted. Typical values are at TA = 25°C.

RS−

Table 1.

Parameter Min Typ Max Unit Conditions

POWER SUPPLY

Operating Voltage Range, VCC 3 28 V Inferred from PSRR test
Common-Mode Input Range, V
Common-Mode Input Rejection, CMR 90 dB V

2 28 V Inferred OUT voltage error test

CMR

= 100 mV, VCC = 12 V

SENSE

Supply Current, ICC 0.5 1.2 mA VCC = 28 V
Leakage Current, I
Input Bias Current, I
Input Bias Current, I
Full Scale Sense Voltage, V
Total Out Voltage Error

±1.0 ±5.0 % V

±1.0 ±5.0 % V
±5.0 % V

Extrapolated Input Offset Voltage, VOS 1.0 mV VCC = V
Out High Voltage (VCC − VOH) 0.8 1.2 V VCC = 3 V, V

0.8 1.2 V VCC = 7.5 V, V

0.8 1.2 V VCC = 15 V, V

0.05 2 μA VCC = 0 V, V

RS+/IRS−

20 60 μA

RS+

40 120 μA

RS−

150 mV V

SENSE

2

±1 % V

±5.0 % V

±7.5 % V

= (V

SENSE

= 100 mV, VCC = 12 V, V

SENSE

= 100 mV, VCC = 12 V, V

SENSE

= 100 mV, VCC = 12 V, V

SENSE

= 100 mV, VCC = 28 V, VRS = 28 V, TA = +25°C

SENSE

= 100 mV, VCC = 28 V, VRS = 28 V, TA = −40°C to +125°C

SENSE

= 6.25 mV,3 VCC = 12 V, VRS = 12 V

SENSE

RS+

= 28 V, TA = 85°C

RS+

− V

RS+

= 12 V, V

)

RS−

= 2 V

RS+

= 12 V, TA = +25°C

RS+

= 12V, TA = −40°C to +125°C

RS

> 10 mV

SENSE

= 150 mV (ADM4073T)

SENSE

= 150 mV (ADM4073F)

SENSE

= 150 mV (ADM4073H), TA = 25°C

SENSE

DYNAMIC CHARACTERISTICS

Bandwidth, BW 1.8 MHz V

1.7 MHz V

1.6 MHz V
600 kHz V

= 100 mV, VCC = 12 V, V

SENSE

= 100 mV, VCC = 12 V, V

SENSE

= 100 mV, VCC = 12 V, V

SENSE

= 6.25 mV,3 VCC = 12 V, V

SENSE

= 12 V, C

RS+

= 12 V, C

RS+

= 12 V, C

RS+

= 12 V, C

RS+

= 5 pF (ADM4073T)

LOAD

= 5 pF (ADM4073F)

LOAD

= 5 pF (ADM4073H)

LOAD

= 5 pF (ADM4073T/F/H)

LOAD

Gain, AV 20 V/V ADM4073T
50 V/V ADM4073F
100 V/V ADM4073H

Gain Accuracy, dAV ±1.0 ±2.0 %

±2.0 %

±1.0 ±1.5 %

±3.0 %

OUT Settling Time to 1% of Final Value 400 ns V

800 ns V

Output Resistance, R

12 kΩ

OUT

Power Supply Rejection Ratio, PSRR 78 dB V
85 dB V
90 dB V

Power-Up Time

Saturation Recovery Time

1

100% production tested at TA = 25°C. Specifications over temperature limit are guaranteed by design.

2

Total out voltage error is the sum of the gain and offset errors.

3

6.25 mV = 1/16th of 100 mV full-scale sense voltage.

4

Output settles to within 1% of final value.

5

The device does not experience phase reversal when overdriven.

4

5

5 μs C
5 μs C

= 10 mV to 150 mV, VCC = 12 V, V

V

SENSE

T

= +25°C (ADM4073T/F)

A

= 10 mV to 150 mV, VCC = 12 V, V

V

SENSE

= −40°C to +125°C (ADM4073T/F)

T

A

= 10 mV to 100 mV, V

V

SENSE

= +25°C (ADM4073H)

T

A

= 10 mV to 100 mV, VCC = 12 V, V

V

SENSE

T

= −40°C to +125°C (ADM4073H)

A

= 6.25 mV to 100 mV, V

SENSE

= 100 mV to 6.25 mV, V

SENSE

= 12 V, V

CC

= 12 V, V

CC

= 12 V, V

CC

= 60 mV, VCC = 3 V to 28 V (ADM4073T)

SENSE

= 24 mV, VCC = 3 V to 28 V (ADM4073F)

SENSE

= 12 mV, VCC = 3 V to 28 V (ADM4073H)

SENSE

= 5 pF, V

LOAD

= 5 pF, VCC = 12 V, V

LOAD

= 100 mV

SENSE

RS+

= 12 V

RS+

= 12 V,

RS+

RS+

RS+

= 12 V,

= 12 V,

= 12 V,

= 12 V, C

RS+

= 12 V, C

RS+

LOAD

LOAD

= 5 pF

= 5 pF

1

Rev. 0 | Page 3 of 12

ADM4073

ABSOLUTE MAXIMUM RATINGS

Table 2.

Parameter Rating

VCC to GND −0.3 V to +30 V
RS± to GND −0.3 V to +30 V
OUT to GND −0.3 V to (VCC + 0.3 V)
OUT Short-Circuit to GND Continuous
Differential Input Voltage (V
Current into any Pin ±20 mA
Storage Temperature Range −65°C to +125°C
Operating Temperature Range −40°C to +125°C
Lead Temperature, Soldering (10 sec)
Junction Temperature 150°C

RS+

− V

) ±5 V

RS−

300°C

ESD CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.

Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.

THERMAL CHARACTERISTICS

θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.

Table 3. Thermal Resistance

Package Type θJA Unit

6-Lead SOT-23 169.5 °C/W

Rev. 0 | Page 4 of 12