Low Cost, Voltage Output, High-Side, Current-Sense Amplifier ADM4073 FEATURES FUNCTIONAL BLOCK DIAGRAM I LOAD Low cost, compact, current-sense solution R SENSE V OUT 2V TO 28V 3 available gain versions RS+ RS 20 V/V (ADM4073T) 50 V/V (ADM4073F) I V RG1 CC 3V TO 28V 100 V/V (ADM4073H) RG1 RG2 0.1F Typical 1.0% full-scale accuracy Supply current: 500 A AV Wide bandwidth: 1.8 MHz Operating supply: 3 V to 28 V Wide common-mode range: 2 V to 28 V ADM4073 Independent of supply voltage Operating temperature range: 40C to +125C CURRENT OUT V MIRROR OUT Available in a 6-lead SOT-23 package RGD = 12k I RGD Pin-to-pin compatibility with the MAX4073 GND APPLICATIONS Figure 1. Cell phones PDAs APPLICATION DIAGRAM Notebook computers R SENSE V 2V TO 28V OUT Portable, battery-powered systems Smart battery packs and chargers Automotive RS+ RS 3V TO 28V Power management systems V CC OUT ADC PA bias control 0.1F ADM4073 General system-level, board-level current monitoring Precision current sources GND Figure 2. GENERAL DESCRIPTION The ADM4073 is a low cost, high-side, current-sense amplifier The voltage on the output pin is determined by the current ideal for small portable applications, such as cell phones, flowing through the selectable external sense resistor and the notebook computers, PDAs, and other systems where current gain of the version selected. The operating range is 3 V to 28 V with a typical supply current of 500 A. monitoring is required. The device is available in three different gain models, eliminating the need for gain-setting resistors. The ADM4073 is available in a 6-lead SOT-23 package and is Because the ground path is not interrupted, the ADM4073 is specified over the automotive operating temperature range particularly useful in rechargeable battery-powered systems, (40C to +125C). 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. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 20062008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 05131-001 05131-003ADM4073 TABLE OF CONTENTS Features .............................................................................................. 1 ESD Caution...................................................................................4 Applications ....................................................................................... 1 Pin Configuration and Function Descriptions ..............................5 Functional Block Diagram .............................................................. 1 Typical Performance Characteristics ..............................................6 Application Diagram ........................................................................ 1 Theory of Operation ...................................................................... 10 General Description ......................................................................... 1 RSENSE ............................................................................................. 10 Revision History ............................................................................... 2 Output (OUT)............................................................................. 10 Specif icat ions ..................................................................................... 3 Outline Dimensions ....................................................................... 11 Absolute Maximum Ratings ............................................................ 4 Ordering Guide .......................................................................... 11 Thermal Characteristics .............................................................. 4 REVISION HISTORY 10/08Rev. 0 to Rev. A Changes to Theory of Operation Section and Output (OUT) Section .............................................................................................. 10 Changes to Ordering Guide .......................................................... 11 7/06Revision 0: Initial Version Rev. A Page 2 of 12