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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. one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781.329.4700 www.analog.com fax: 781.461.3113 ?2006C2008 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 a 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: ?40c to +125c 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 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 0.1f v out r sense i load i rg1 v out rs+ gnd av rs? v cc rg2 rgd = 12k ? rg1 adm4073 i rgd current mirror 05131-003 out figure 1. application diagram 2 v to 28 v 3v to 28v 0.1f v out r sense out adc rs+ gnd rs? v cc 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 a. the adm4073 is available in a 6-lead sot-23 package and is specified over the automotive operating temperature range (?40c to +125c).
adm4073 rev. a | page 2 of 12 table of contents features .............................................................................................. 1 ? applications ....................................................................................... 1 ? functional block diagram .............................................................. 1 ? application diagram ........................................................................ 1 ? general description ......................................................................... 1 ? revision history ............................................................................... 2 ? specifications ..................................................................................... 3 ? absolute maximum ratings ............................................................ 4 ? thermal characteristics .............................................................. 4 ? esd caution...................................................................................4 ? pin configuration and function descriptions ..............................5 ? typical performance characteristics ..............................................6 ? theory of operation ...................................................................... 10 ? r sense ............................................................................................. 10 ? output (out)............................................................................. 10 ? outline dimensions ....................................................................... 11 ? ordering guide .......................................................................... 11 ? 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
adm4073 rev. a | page 3 of 12 specifications v rs+ = 2 v to 28 v, v sense = (v rs+ ? v rs? ) = 0 v, v cc = 3 v to 28 v, t a = ?40c to +125c, unless otherwise noted. typical values are at t a = 25c. 1 table 1. parameter min typ max unit conditions power supply operating voltage range, v cc 3 28 v inferred from psrr test common-mode input range, v cmr 2 28 v inferred out voltage error test common-mode input rejection, cmr 90 db v sense = 100 mv, v cc = 12 v supply current, i cc 0.5 1.2 ma v cc = 28 v leakage current, i rs+ /i rs? 0.05 2 a v cc = 0 v, v rs+ = 28 v, t a = 85c input bias current, i rs+ 20 60 a input bias current, i rs? 40 120 a full-scale sense voltage, v sense 150 mv v sense = (v rs+ ? v rs? ) total output voltage error 2 1 % v sense = 100 mv, v cc = 12 v, v rs+ = 2 v 1.0 5.0 % v sense = 100 mv, v cc = 12 v, v rs+ = 12 v, t a = +25c 5.0 % v sense = 100 mv, v cc = 12 v, v rs = 12v, t a = ?40c to +125c 1.0 5.0 % v sense = 100 mv, v cc = 28 v, v rs = 28 v, t a = +25c 5.0 % v sense = 100 mv, v cc = 28 v, v rs = 28 v, t a = ?40c to +125c 7.5 % v sense = 6.25 mv, 3 v cc = 12 v, v rs = 12 v extrapolated input offset voltage, v os 1.0 mv v cc = v rs+ = 12 v, v sense > 10 mv output high voltage (v cc ? v oh ) 0.8 1.2 v v cc = 3 v, v sense = 150 mv (adm4073t) 0.8 1.2 v v cc = 7.5 v, v sense = 150 mv (adm4073f) 0.8 1.2 v v cc = 15 v, v sense = 150 mv (adm4073h), t a = 25c dynamic characteristics bandwidth, bw 1.8 mhz v sense = 100 mv, v cc = 12 v, v rs+ = 12 v, c load = 5 pf (adm4073t) 1.7 mhz v sense = 100 mv, v cc = 12 v, v rs+ = 12 v, c load = 5 pf (adm4073f) 1.6 mhz v sense = 100 mv, v cc = 12 v, v rs+ = 12 v, c load = 5 pf (adm4073h) 600 khz v sense = 6.25 mv, 3 v cc = 12 v, v rs+ = 12 v, c load = 5 pf (adm4073t/f/h) gain, a v 20 v/v adm4073t 50 v/v adm4073f 100 v/v adm4073h gain accuracy 1.0 2.0 % v sense = 10 mv to 150 mv, v cc = 12 v, v rs+ = 12 v, t a = +25c (adm4073t/f) 2.0 % v sense = 10 mv to 150 mv, v cc = 12 v, v rs+ = 12 v, t a = ?40c to +125c (adm4073t/f) 1.0 1.5 % v sense = 10 mv to 100 mv, v cc = 12 v, v rs+ = 12 v, t a = +25c (adm4073h) 3.0 % v sense = 10 mv to 100 mv, v cc = 12 v, v rs+ = 12 v, t a = ?40c to +125c (adm4073h) out settling time to 1% of final value 400 ns v sense = 6.25 mv to 100 mv, v cc = 12 v, v rs+ = 12 v, c load = 5 pf 800 ns v sense = 100 mv to 6.25 mv, v cc = 12 v, v rs+ = 12 v, c load = 5 pf output resistance, r out 12 k power supply rejection ratio, psrr 78 db v sense = 60 mv, v cc = 3 v to 28 v (adm4073t) 85 db v sense = 24 mv, v cc = 3 v to 28 v (adm4073f) 90 db v sense = 12 mv, v cc = 3 v to 28 v (adm4073h) power-up time 4 5 s c load = 5 pf, v sense = 100 mv saturation recovery time 5 5 s c load = 5 pf, v cc = 12 v, v rs+ = 12 v 1 100% production tested at t a = 25c. specifications over temper ature limit are guaranteed by design. 2 the sum of the gain and offset errors is the total out voltage error. 3 6.25 mv = 1/16 th of 100 mv full-sca le sense voltage. 4 output settles to within 1% of final value. 5 when overdriven, this device does not experience phase reversal.
adm4073 rev. a | page 4 of 12 absolute maximum ratings table 2. parameter rating v cc to gnd ?0.3 v to +30 v rs+, rs? to gnd ?0.3 v to +30 v out to gnd ?0.3 v to (v cc + 0.3 v) out short-circuit to gnd continuous differential input voltage (v rs+ ? v rs? ) 5 v current into any pin 20 ma storage temperature range ?65c to +125c operating temperature range ?40c to +125c lead temperature, soldering (10 sec) 300c junction temperature 150c 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 ja 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 ja unit 6-lead sot-23 169.5 c/w esd caution
adm4073 rev. a | page 5 of 12 pin configuration and fu nction descriptions g nd 1 g nd 2 v cc 3 out 6 rs? 5 rs+ 4 top view (not to scale) 05131-002 figure 3. pin configuration table 4. pin function descriptions pin no. mnemonic description 1 gnd chip ground pin. 2 gnd chip ground pin. 3 v cc chip power supply. requires a 0.1 f 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. v out is proportional to v sense . output impedance is approximately 12 k .
adm4073 rev. a | page 6 of 12 typical performance characteristics 0.60 0.30 03 0 supply voltage (v) supply current (ma) 5 10152025 adm4073h adm4073t adm4073f v sense = 6.25mv 0.55 0.50 0.45 0.40 0.35 05131-005 figure 4. supply current vs. supply voltage (v sense = 6.25 mv) 1.5 0.5 03 0 supply voltage (v) supply current (ma) 5 10152025 adm4073h adm4073t adm4073f v sense = 100mv 1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 05131-006 figure 5. supply current vs. supply voltage (v sense = 100 mv) 0.7 0 ?50 150 temperature (c) supply current (ma) 0.6 0.5 0.4 0.3 0.2 0.1 v sense = 0mv v cc = 28v ?25 0 25 50 75 100 125 05131-007 figure 6. supply current vs. temperature 0.45 0.35 03 v rs+ (v) supply current (ma) 0 5 10152025 adm4073h adm4073t adm4073f 0.43 0.41 0.39 0.37 v sense = 6.25mv 05131-008 figure 7. supply current vs. rs+ voltage (v sense = 6.25 mv) 1.5 0.5 03 v rs+ (v) supply current (ma) 0 5 10152025 adm4073h adm4073t adm4073f 1.3 1.1 0.9 0.7 v sense = 100mv 05131-009 figure 8. supply current vs. rs+ voltage (v sense = 100 mv) 1.0 ?1.0 03 supply voltage (v) total output error (%) 0 5 10152025 adm4073h adm4073t adm4073f 0.8 0.6 0.4 0.2 0 ?0.2 ?0.4 ?0.6 ?0.8 v sense = 100mv 05131-010 figure 9. total output error vs. supply voltage (v sense = 100 mv)
adm4073 rev. a | page 7 of 12 1.0 ?1.0 03 0 supply voltage (v) total output error (%) v sense = 6.25mv 0.8 0.6 0.4 0.2 0 ?0.2 ?0.4 ?0.6 ?0.8 adm4073f adm4073t adm4073h 05131-011 5 10152025 figure 10. total output error vs. supply voltage (v sense = 6.25 mv) 1.0 ?3.0 03 0 common-mode voltage (v) total output error (%) adm4073h 5 10152025 adm4073t adm4073f ?1.0 0.5 0 ?0.5 ?1.5 ?2.0 ?2.5 05131-012 figure 11. total output error vs. common-mode voltage 0.10 ?0.10 ?50 150 temperature (c) total output error (%) 0.08 0.06 0.04 0.02 0 ?0.02 ?0.04 ?0.06 ?0.08 v cc = 28v v cc = 12v 0 50 100 05131-013 figure 12. total output error vs. temperature 2.0 ?2.0 ?50 150 temperature (c) gain accuracy (%) 0 50 100 1.5 1.0 0.5 0 ?0.5 ?1.0 ?1.5 ?25 25 75 125 05131-014 figure 13. gain accuracy vs. temperature 1.4 0 ?50 150 temperature (c) v cc ? v oh (v) 05131-015 1.2 1.0 0.8 0.6 0.4 0.2 0 50 100 adm4073t adm4073f adm4073h figure 14. output high voltage (v cc ? v oh ) vs. temperature 70 0 0.1 10000 frequency (khz) psrr (db) 05131-016 60 50 40 30 20 10 1 10 100 1000 adm4073f adm4073t adm4073h figure 15. psrr vs. frequency
adm4073 rev. a | page 8 of 12 45 0 0.1 10000 frequency (khz) gain (db) 05131-017 1 10 100 1000 adm4073f adm4073t adm4073h 40 35 30 25 20 15 10 5 figure 16. small signal gain vs. frequency 05131-018 1s/div 100mv 95mv 2v 1.9v v sense 2.5mv/di v out 50mv/div figure 17. adm4073t small signal transient response 05131-019 1s/div 100mv 95mv 5v 4.75v v sense 2.5mv/div out 125mv/di v figure 18. adm4073f small signal transient response 05131-020 1s/div 100mv 95mv 10v 9.5v v sense 2.5mv/div out 2 50mv/di v figure 19. adm4073h small signal transient response 05131-021 1s/div 100mv 6.25mv 2v 0.120v v sense 45mv/div out 0.9v/div figure 20. adm4073t large signal transient response 05131-022 1s/div 100mv 6.25mv 5v 0.3v v sense 45mv/div out 2.35v/div figure 21. adm4073f large signal transient response
adm4073 rev. a | page 9 of 12 05131-023 1s/div 100mv 6.25mv 10v 0.6v v sense 45mv/div out 4.7v/div figure 22. adm4073h large signal transient response 05131-024 1s/div 250mv 50mv v oh 1v v sense 100mv/di v out 6 00mv/di v v cc = 3v figure 23. adm4073t overdrive response 05131-025 1s/div 4v 0v 2v 0v v cc 2 v/di v out 1v/di v v cc = 0v to 4v figure 24. adm4073t start-up delay
adm4073 rev. a | page 10 of 12 theory of operation the current from the source flows through r sense , which gen- erates a voltage drop, v sense , across the rs+ and rs? terminals of the sense amplifier. the input stage amplifier a1 regulates its inputs to be equal, thereby shunting a current proportional to v sense /r g1 to the output current mirror. this current is then multiplied by a gain factor of b in the output stage current mir- ror and flows through r gd to generate v out . therefore, v out is related to v sense by the ratio of r g1 to r gd and the current gain of b. v out = a v v sense where: a v = r gd / r g1 b a v is equal to different voltages depending upon the model of the device. ? 20 v/v for adm4073t. ? 50 v/v for adm4073f. ? 100 v/v for adm4073h. 2v to 28v 3v to 28v 0.1f v out r sense i load i rg1 v out rs+ gnd av rs? v cc r g2 r gd = 12k ? r g1 adm4073 i rgd current mirror 05131-026 out figure 25. functional block diagram r sense the adm4073 has the ability to sense a wide variety of currents by selecting a particular sense resistor. select a suitable output voltage for full-scale current, such as 10 v for 10 a. then, select a gain model that gives the most efficient use of the sense volt- age range (150 mv max). in the example above, using the adm4073h (gain of 100) gives an output voltage of 10 v when the sense voltage is 100 mv. use the following equation to determine what value of sense resistor gives 100 mv with 10 a flowing through it: r sense = 100 mv/10 a r sense = 10 m to measure lower currents accurately, use as large a sense resistor as possible to utilize th e higher end of the sense voltage range. this reduces the effects of the offset voltage errors in the internal amplifier. when currents are very large, it is important to take the i 2 r power losses across the sense resistor into account. if the sense resistors rated power dissipation is not sufficient, its value can drift, giving an inaccurate output voltage or it could fail alto- gether. this, in turn, causes the voltage across the rs+ and rs? pins to exceed the absolute maximum ratings. if the monitored supply rail has a large amplitude high frequency component, choose a sense resistor with low inductance. input copper pcb trace output 3v to 28 v 0.1f r sense out rs+ gnd rs? v cc adm4073 05131-004 figure 26. using pcb trace for current sensing output (out) the output stage of the adm4073 is a current source driving a pull-down resistance. to ensure optimum accuracy, care must be taken not to load this output externally. to minimize output errors, ensure out is connected to a high impedance input stage. if this is not possible, output buffering is recommended. the percent error introduced by output loading is determined with the following formula: ( ) ( ) load intout load r rr error + ? = _ /1100 % where: r load is the external load applied to out. r out_int is the internal output resistance (12 k). v out = ( i load r sense ) a v
adm4073 rev. a | page 11 of 12 outline dimensions 1 3 4 5 2 6 2.90 bsc 1.60 bsc 2.80 bsc 1.90 bsc 0.95 bsc 0.22 0.08 10 4 0 0.50 0.30 0.15 max 1.30 1.15 0.90 seating plane 1.45 max 0.60 0.45 0.30 pin 1 indicator compliant to jedec standards mo-178-ab figure 27. 6-lead small outline transistor package [sot-23] (rj-6) dimensions shown in millimeters ordering guide model gain temperature range package description package option branding adm4073twrjz-reel7 1 20 ?40c to +125c 6-lead sot-23 rj-6 m2e adm4073fwrjz-reel7 1 50 ?40c to +125c 6-lead sot-23 rj-6 m2c adm4073hwrjz-reel7 1 100 ?40c to +125c 6-lead sot-23 rj-6 m2d adm4073wfwrjz-rl7 1, 2 50 ?40c to +125c 6-lead sot-23 rj-6 m2c 1 z = rohs compliant part. 2 automotive grade.
adm4073 rev. a | page 12 of 12 notes ?2006C2008 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. d05131-0-10/08(a)

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