ADM4073

ADM4073 Low Cost, Voltage Output, High-Side, Current-Sense Amplifier (Rev. A) Data Sheet

Document overview

• Manufacturer or author: Analog Devices, Inc.
• PDF pages: 12

Technical content

Low Cost, Voltage Output, High-Side, Current-Sense Amplifier ADM4073 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 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. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2006–2008 Analog Devices, Inc. All rights reserved.

FEATURES

Low cost, compact, current-sense solution 3 available gain versions

20 V/V (ADM4073T)

50 V/V (ADM4073F)

100 V/V (ADM4073H)

Typical ±1.0% full-scale accuracy Supply current: 500 μA Wide bandwidth: 1.8 MHz Operating supply: 3 V to 28 V Wide common-mode range: 2 V to 28 V Independent of supply voltage Operating temperature range: −40°C to +125°C Available in a 6-lead SOT-23 package Pin-to-pin compatibility with the MAX4073

APPLICATIONS

Portable, battery-powered systems Smart battery packs and chargers Automotive Power management systems PA bias control General system-level, board-level current monitoring Precision current sources FUNCTIONAL BLOCK DIAGRAM 2V TO 28V 3V TO 28V 0.1µF VOUTRSENSE ILOAD IRG1 VOUT RS+ GND AV RS– VCC RG2 RGD = 12kΩ RG1 ADM4073 IRGD CURRENT MIRROR 05131-003 OUT Figure 1. APPLICATION DIAGRAM 2V TO 28V 3V TO 28V 0.1µF VOUTRSENSE OUT ADC RS+ GND RS– VCC ADM4073 05131-001 Figure 2. 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. 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).

Rev. A | Page 2 of 12 TABLE OF CONTENTS

REVISION HISTORY

10/08—Rev. 0 to Rev. A Changes to Theory of Operation Section and Output (OUT) 7/06—Revision 0: Initial Version

Rev. A | Page 3 of 12 SPECIFICATIONS VRS+ = 2 V to 28 V , VSENSE = (VRS+ − VRS−) = 0 V , VCC = 3 V to 28 V , TA = −40°C to +125°C, unless otherwise noted. Typical values are at TA = 25°C.1 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, VCMR 2 28 V Inferred OUT voltage error test Common-Mode Input Rejection, CMR 90 dB VSENSE = 100 mV, VCC = 12 V Supply Current, ICC 0.5 1.2 mA VCC = 28 V Leakage Current, IRS+/IRS− 0.05 2 μA VCC = 0 V, VRS+ = 28 V, TA = 85°C Input Bias Current, IRS+ 20 60 μA Input Bias Current, IRS− 40 120 μA Full-Scale Sense Voltage, VSENSE 150 mV VSENSE = (VRS+ − VRS−) Total Output Voltage Error2 ±1 % VSENSE = 100 mV, VCC = 12 V, VRS+ = 2 V ±1.0 ±5.0 % VSENSE = 100 mV, VCC = 12 V, VRS+ = 12 V, TA = +25°C ±5.0 % VSENSE = 100 mV, VCC = 12 V, VRS = 12V, TA = −40°C to +125°C ±1.0 ±5.0 % VSENSE = 100 mV, VCC = 28 V, VRS = 28 V, TA = +25°C ±5.0 % VSENSE = 100 mV, VCC = 28 V, VRS = 28 V, TA = −40°C to +125°C ±7.5 % VSENSE = 6.25 mV,3 VCC = 12 V, VRS = 12 V Extrapolated Input Offset Voltage, VOS 1.0 mV VCC = VRS+ = 12 V, VSENSE > 10 mV Output High Voltage (VCC − VOH) 0.8 1.2 V VCC = 3 V, VSENSE = 150 mV (ADM4073T) 0.8 1.2 V VCC = 7.5 V, VSENSE = 150 mV (ADM4073F) 0.8 1.2 V VCC = 15 V, VSENSE = 150 mV (ADM4073H), TA = 25°C DYNAMIC CHARACTERISTICS Bandwidth, BW 1.8 MHz VSENSE = 100 mV, VCC = 12 V, VRS+ = 12 V, CLOAD = 5 pF (ADM4073T)

1.7 MHz VSENSE = 100 mV, VCC = 12 V, VRS+ = 12 V, CLOAD = 5 pF (ADM4073F)

1.6 MHz VSENSE = 100 mV, VCC = 12 V, VRS+ = 12 V, CLOAD = 5 pF (ADM4073H)

600 kHz VSENSE = 6.25 mV,3 VCC = 12 V, VRS+ = 12 V, CLOAD = 5 pF (ADM4073T/F/H) Gain, AV 20 V/V ADM4073T

50 V/V ADM4073F

100 V/V ADM4073H

Gain Accuracy ±1.0 ±2.0 % VSENSE = 10 mV to 150 mV, VCC = 12 V, VRS+ = 12 V, TA = +25°C (ADM4073T/F) ±2.0 % VSENSE = 10 mV to 150 mV, VCC = 12 V, VRS+ = 12 V, TA = −40°C to +125°C (ADM4073T/F) ±1.0 ±1.5 % VSENSE = 10 mV to 100 mV, VCC = 12 V, VRS+ = 12 V, TA = +25°C (ADM4073H) ±3.0 % VSENSE = 10 mV to 100 mV, VCC = 12 V, VRS+ = 12 V, TA = −40°C to +125°C (ADM4073H) OUT Settling Time to 1% of Final Value 400 ns VSENSE = 6.25 mV to 100 mV, VCC = 12 V, VRS+ = 12 V, CLOAD = 5 pF 800 ns VSENSE = 100 mV to 6.25 mV, VCC = 12 V, VRS+ = 12 V, CLOAD = 5 pF Output Resistance, ROUT 12 kΩ Power Supply Rejection Ratio, PSRR 78 dB VSENSE = 60 mV, VCC = 3 V to 28 V (ADM4073T) 85 dB V SENSE = 24 mV, VCC = 3 V to 28 V (ADM4073F) 90 dB V SENSE = 12 mV, VCC = 3 V to 28 V (ADM4073H) Power-Up Time4 5 μs CLOAD = 5 pF, VSENSE = 100 mV Saturation Recovery Time5 5 μs CLOAD = 5 pF, VCC = 12 V, VRS+ = 12 V 1 100% production tested at TA = 25°C. Specifications over temperature limit are guaranteed by design. 2 The sum of the gain and offset errors is the total OUT voltage error. 3 6.25 mV = 1/16th of 100 mV full-scale sense voltage. 4 Output settles to within 1% of final value. 5 When overdriven, this device does not experience phase reversal.

soldered in a circuit board for surface-mount packages. Table 3. Thermal Resistance

Figure 3. Pin Configuration Table 4. Pin Function Descriptions 3 V CC Chip Power Supply. Requires a 0.1 μF capacitor to ground. 4 RS+ Power-Side Connection to the External Sense Resistor. 5 RS− Load-Side Connection to the External Sense Resistor. 6 OUT Voltage Output. VOUT is proportional to VSENSE. Output impedance is approximately 12 kΩ.

2.90 BSC

0.95 BSC

0.15 MAX

0.90 SEATING

1.45 MAX

Figure 27. 6-Lead Small Outline Transistor Package [SOT-23]

Rev. A | Page 12 of 12 NOTES ©2006–2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the prop erty of their respective owners. D05131-0-10/08(A)