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ACS722 approximate scale 1:1 the allegro ? ACS722 current sensor ic is an economical and precise solution for ac or dc current sensing in industrial, commercial, and communications systems. the small package is ideal for space constrained applications while also saving costs due to reduced board area. typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection. the device consists of a precise, low-offset, linear hall sensor circuit with a copper conduction path located near the surface of the die. applied current flowing through this copper conduction path generates a magnetic field which is sensed by the integrated hall ic and converted into a proportional voltage. device accuracy is optimized through the close proximity of the magnetic field to the hall transducer. a precise, proportional voltage is provided by the low-offset, chopper-stabilized bicmos hall ic, which includes allegros patented digital temperature compensation, resulting in extremely accurate performance over temperature. the output of the device has a positive slope when an increasing current flows through the primary copper conduction path (from pins 1 and 2, to pins 3 and 4), which is the path used for current sensing. the internal resistance of this conductive path is 0.65 m? typical, providing low power loss. the terminals of the conductive path are electrically isolated from the sensor leads (pins 5 through 8). this allows the ACS722 current sensor ic to be used in high-side current sense applications without the use of high-side differential amplifiers or other costly isolation techniques. the ACS722 is provided in a small, low profile surface mount soic8 package. the leadframe is plated with 100% matte tin, ACS722-ds ? patented integrated digital temperature compensation circuitry allows for near closed loop accuracy over temperature in an open loop sensor ? ul60950-1 (ed. 2) certified dielectric strength voltage = 2.4 kvrms basic isolation working voltage = 420 vpk/297 vrms ? industry-leading noise performance with greatly improved bandwidth through proprietary amplifier and filter design techniques ? pin-selectable band width: 80 khz for high bandwidth applications or 20 khz for low noise performance. ? 0.65 m? primary conductor resistance for low power loss and high inrush current withstand capability ? small footprint, low-profile soic8 package suitable for space-constrained applications ? integrated shield virtually eliminates capacitive coupling from current conductor to die, greatly suppressing output noise due to high dv/dt transients ? 3 to 3.6 v, single supply operation high accuracy, galvanically isolated current sensor ic with small footprint soic8 package continued on the next page package: 8-pin soic (suff?ix lc) typical application p p p l c byp ass 0.1 f ACS722 c 2 1 3 4 6 8 5 7 ip+ vcc ?i +i ip+ viout ip? ip? bw_sel gnd i the ACS722 outputs an analog signal, v iout , that changes, proportionally, with the bidirectional ac or dc primary sensed current, i p , within the specified measurement range. the bw_sel pin can be used to select one of the two bandwidths to optimize the noise performance. continued on the next page cb certif?icate number: us-22334-a1-ul features and benefits description
2 selection guide part number i pr (a) sens(typ) at v cc = 3.3 v (mv/a) t a (c) packing 1 ACS722llctr-05ab-t 2 5 264 -40 to 150 tape and reel, 3000 pieces per reel ACS722llctr-10au-t 2 10 ACS722llctr-10ab-t 2 10 132 ACS722llctr-20au-t 2 20 ACS722llctr-20ab-t 2 20 66 ACS722llctr-40au-t 2 40 ACS722llctr-40ab-t 2 40 33 1 contact allegro for additional packing options. 2 variant not intended for automotive applications. which is compatible with standard lead (pb) free printed circuit board assembly processes. internally, the device is pb-free, except for flip-chip high-temperature pb-based solder balls, currently exempt from rohs. the device is fully calibrated prior to shipment from the factory. description (continued) ? output voltage proportional to ac or dc current ? factory-trimmed sensitivity and quiescent output voltage for improved accuracy ? chopper stabilization results in extremely stable quiescent output voltage ? nearly zero magnetic hysteresis ? ratiometric output from supply voltage features and benefits (continued) high accuracy, galvanically isolated current sensor ic with small footprint soic8 package ACS722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
3 thermal characteristics characteristic symbol test conditions* value units package thermal resistance (junction to ambient) r ja mounted on the allegro 85-xxxx evaluation board with 1500 mm 2 of 2 oz. copper on each side, connected to pins 1 and 2, and to pins 3 and 4, with thermal vias connecting the layers. performance values include the power consumed by the pcb. 23 oc/w package thermal resistance (junction to lead) r jl mounted on the allegro asek 722 evaluation board. 5 oc/w *additional thermal information available on the allegro website. isolation characteristics characteristic symbol notes rating unit dielectric strength test voltage v iso agency type-tested for 60 seconds per ul 60950-1 (edition. 2). production tested at v iso for 1 second, in accordance with ul 60950-1 (edition. 2). 2400 v rms working voltage for basic isolation v wvbi maximum approved working voltage for basic (single) isolation according ul 60950-1 (edition 2). 420 v pk or vdc 297 v rms clearance d cl minimum distance through air from ip leads to signal leads. 3.9 mm creepage d cr minimum distance along package body from ip leads to signal leads. 3.9 mm absolute maximum ratings characteristic symbol notes rating units supply voltage v cc 6 v reverse supply voltage v rcc C0.1 v output voltage v iout 25 v reverse output voltage v riout C0.1 v operating ambient temperature t a range l C40 to 150 c junction temperature t j (max) 165 c storage temperature t stg C65 to 165 c specifications high accuracy, galvanically isolated current sensor ic with small footprint soic8 package ACS722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
4 d y namic o ffset c anc ell a t ion mas ter current suppl y p r o g r a mmi n g c ontr o l eep rom and c ontr o l l o g i c offset c o ntr o l sen siti vity con t r o l t u n ed fil t e r t e m p e r a t u r e s ensor h a ll c u r r ent d r i ve por to all subcirc u i t s i p + i p + i p ? i p ? v cc viout gn d b w_sel functional block diagram high accuracy, galvanically isolated current sensor ic with small footprint soic8 package ACS722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
5 terminal list table number name description 1, 2 ip+ terminals for current being sensed; fused internally 3, 4 ipC terminals for current being sensed; fused internally 5 gnd signal ground terminal 6 bw_sel terminal for selecting 20 khz or 80 khz bandwidth 7 viout analog output signal 8 vcc device power supply terminal ip+ ip+ ip? ip? vcc viout bw_sel gnd 1 2 3 4 8 7 6 5 pin-out diagram pin-out diagram and terminal list high accuracy, galvanically isolated current sensor ic with small footprint soic8 package ACS722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
6 common electrical characteristics 1 : valid through the full range of t a = C40c to 150c , and at v cc = 3.3 v; unless otherwise specif?ied characteristic symbol test conditions min. typ. max. units supply voltage v cc 3 3.3 3.6 v supply current i cc v cc within v cc (min) and v cc (max) C 9 12 ma output capacitance load c l viout to gnd C C 10 nf output resistive load r l viout to gnd 4.7 C C k? primary conductor resistance r ip t a = 25c C 0.65 C m? rise time t r i p = i p (max), t a = 25c, c l = 1 nf, bw_sel tied to gnd C 4 C s i p = i p (max), t a = 25c, c l = 1 nf, bw_sel tied to vcc C 17.5 C s propagation delay t pd i p = i p (max), t a = 25c, c l = 1 nf, bw_sel tied to gnd C 1 C s i p = i p (max), t a = 25c, c l = 1 nf, bw_sel tied to vcc C 5 C s response time t response i p = i p (max), t a = 25c, c l = 1 nf, bw_sel tied to gnd C 5 C s i p = i p (max), t a = 25c, c l = 1 nf, bw_sel tied to vcc C 22.5 C s internal bandwidth bwi small signal C3 db; c l = 1 nf, bw_sel tied to gnd C 80 C khz small signal C3 db; c l = 1nf, bw_sel tied to vcc C 20 C khz noise density i nd input referenced noise density; t a = 25c, c l = 1 nf C 150 C a (rms) / hz noise i n input referenced noise; bwi = 80 khz, t a = 25c, c l = 1 nf C 42 C ma (rms) input referenced noise; bwi = 20 khz, t a = 25c, c l = 1 nf C 21 C ma (rms) nonlinearity e lin through full range of i p C 1 % saturation voltage 2 v oh r l = 4.7 k?, t a = 25c v cc C 0.33 C C v v ol r l = 4.7 k?, t a = 25c C C 0.33 v power-on time t po output reaches 90% of steady-state level, t a = 25c, i p = i pr (max) applied C 64 C s 1 device may be operated at higher primary current levels, i p , ambient temperatures, t a , and internal leadframe temperatures, provided the maximum junction tem - perature, t j (max), is not exceeded. 2 the sensor ic will continue to respond to current beyond the range of i p until the high or low saturation voltage; however, the nonlinearity in this region will be worse than through the rest of the measurement range. high accuracy, galvanically isolated current sensor ic with small footprint soic8 package ACS722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
7 xllctr-5ab performance characteristics : t a range l, valid at t a = C?40c to 150c, v cc = 3.3 v, unless oth - erwise specif?ied characteristic symbol test conditions min. typ. max. units nominal performance current sensing range i pr C5 C 5 a sensitivity sens i pr (min) < i p < i pr (max) C 264 C mv/a zero current output voltage v iout(q) bidirectional; i p = 0 a C v cc x 0.5 C v accuracy performance sensitivity error e sens t a = 25c to 150c; measured at i p = i pr (max) C2 C 2 % t a = C40c to 25c; ; measured at i p = i pr (max) C 2.5 C % offset voltage v oe i p = 0 a; t a = 25c to 150c C15 C 15 mv i p = 0 a; t a = -40c to 25c C 20 C mv total output error* e tot i p = i pr (max), t a = 25c to 150c C2.5 C 2.5 % i p = i pr (max), t a = C40c to 25c C 3 C % lifetime drift characteristics sensitivity error lifetime drift e sens_drift C 2 C % total output error lifetime drift e tot_drift C 2 C % *percentage of i p , with i p = i pr (max) high accuracy, galvanically isolated current sensor ic with small footprint soic8 package ACS722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
8 xllctr-10au performance characteristics : t a range l, valid at t a = C?40c to 150c, v cc = 3.3 v, unless otherwise specif?ied characteristic symbol test conditions min. typ. max. units nominal performance current sensing range i pr 0 C 10 a sensitivity sens i pr (min) < i p < i pr (max) C 264 C mv/a zero current output voltage v iout(q) unidirectional; i p = 0 a C v cc x 0.1 C v accuracy performance sensitivity error e sens t a = 25c to 150c; measured at i p = i pr (max) C2 C 2 % t a = C40c to 25c; ; measured at i p = i pr (max) C 2.5 C % offset voltage v oe i p = 0 a; t a = 25c to 150c C15 C 15 mv i p = 0 a; t a = -40c to 25c C 20 C mv total output error* e tot i p = i pr (max), t a = 25c to 150c C2.5 C 2.5 % i p = i pr (max), t a = C40c to 25c C 3 C % lifetime drift characteristics sensitivity error lifetime drift e sens_drift C 2 C % total output error lifetime drift e tot_drift C 2 C % *percentage of i p , with i p = i pr (max) xllctr-10ab performance characteristics : t a range l, valid at t a = C?40c to 150c, v cc = 3.3 v, unless otherwise specif?ied characteristic symbol test conditions min. typ. max. units nominal performance current sensing range i pr C10 C 10 a sensitivity sens i pr (min) < i p < i pr (max) C 132 C mv/a zero current output voltage v iout(q) bidirectional; i p = 0 a C v cc x 0.5 C v accuracy performance sensitivity error e sens t a = 25c to 150c; measured at i p = i pr (max) C1.5 C 1.5 % t a = C40c to 25c; ; measured at i p = i pr (max) C 2 C % offset voltage v oe i p = 0 a; t a = 25c to 150c C10 C 10 mv i p = 0 a; t a = -40c to 25c C 15 C mv total output error* e tot i p = i pr (max), t a = 25c to 150c C2 C 2 % i p = i pr (max), t a = C40c to 25c C 3 C % lifetime drift characteristics sensitivity error lifetime drift e sens_drift C 2 C % total output error lifetime drift e tot_drift C 2 C % *percentage of i p , with i p = i pr (max) high accuracy, galvanically isolated current sensor ic with small footprint soic8 package ACS722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
9 xllctr-20au performance characteristics : t a range l, valid at t a = C?40c to 150c, v cc = 3.3 v, unless otherwise specif?ied characteristic symbol test conditions min. typ. max. units nominal performance current sensing range i pr 0 C 20 a sensitivity sens i pr (min) < i p < i pr (max) C 132 C mv/a zero current output voltage v iout(q) unidirectional; i p = 0 a C v cc x 0.1 C v accuracy performance sensitivity error e sens t a = 25c to 150c; measured at i p = i pr (max) C1.5 C 1.5 % t a = C40c to 25c; ; measured at i p = i pr (max) C 2 C % offset voltage v oe i p = 0 a; t a = 25c to 150c C10 C 10 mv i p = 0 a; t a = -40c to 25c C 15 C mv total output error* e tot i p = i pr (max), t a = 25c to 150c C2 C 2 % i p = i pr (max), t a = C40c to 25c C 3 C % lifetime drift characteristics sensitivity error lifetime drift e sens_drift C 2 C % total output error lifetime drift e tot_drift C 2 C % *percentage of i p , with i p = i pr (max) xllctr-20ab performance characteristics : t a range l, valid at t a = C?40c to 150c, v cc = 3.3 v, unless otherwise specif?ied characteristic symbol test conditions min. typ. max. units nominal performance current sensing range i pr C20 C 20 a sensitivity sens i pr (min) < i p < i pr (max) C 66 C mv/a zero current output voltage v iout(q) bidirectional; i p = 0 a C v cc x 0.5 C v accuracy performance sensitivity error e sens t a = 25c to 150c; measured at i p = i pr (max) C1.5 C 1.5 % t a = C40c to 25c; ; measured at i p = i pr (max) C 2 C % offset voltage v oe i p = 0 a; t a = 25c to 150c C10 C 10 mv i p = 0 a; t a = -40c to 25c C 15 C mv total output error* e tot i p = i pr (max), t a = 25c to 150c C2 C 2 % i p = i pr (max), t a = C40c to 25c C 3 C % lifetime drift characteristics sensitivity error lifetime drift e sens_drift C 2 C % total output error lifetime drift e tot_drift C 2 C % *percentage of i p , with i p = i pr (max) high accuracy, galvanically isolated current sensor ic with small footprint soic8 package ACS722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
10 xllctr-40au performance characteristics : t a range l, valid at t a = C?40c to 150c, v cc = 3.3 v, unless otherwise specif?ied characteristic symbol test conditions min. typ. max. units nominal performance current sensing range i pr 0 C 40 a sensitivity sens i pr (min) < i p < i pr (max) C 66 C mv/a zero current output voltage v iout(q) unidirectional; i p = 0 a C v cc x 0.1 C v accuracy performance sensitivity error e sens t a = 25c to 150c; measured at i p = i pr (max) C1.5 C 1.5 % t a = C40c to 25c; ; measured at i p = i pr (max) C 2 C % offset voltage v oe i p = 0 a; t a = 25c to 150c C10 C 10 mv i p = 0 a; t a = -40c to 25c C 15 C mv total output error* e tot i p = i pr (max), t a = 25c to 150c C2 C 2 % i p = i pr (max), t a = C40c to 25c C 3 C % lifetime drift characteristics sensitivity error lifetime drift e sens_drift C 2 C % total output error lifetime drift e tot_drift C 2 C % *percentage of i p , with i p = i pr (max) xllctr-40ab performance characteristics : t a range l, valid at t a = C?40c to 150c, v cc = 3.3 v, unless otherwise specif?ied characteristic symbol test conditions min. typ. max. units nominal performance current sensing range i pr C40 C 40 a sensitivity sens i pr (min) < i p < i pr (max) C 33 C mv/a zero current output voltage v iout(q) bidirectional; i p = 0 a C v cc x 0.5 C v accuracy performance sensitivity error e sens t a = 25c to 150c; measured at i p = i pr (max) C1.5 C 1.5 % t a = C40c to 25c; ; measured at i p = i pr (max) C 2 C % offset voltage v oe i p = 0 a; t a = 25c to 150c C10 C 10 mv i p = 0 a; t a = -40c to 25c C 15 C mv total output error* e tot i p = i pr (max), t a = 25c to 150c C2 C 2 % i p = i pr (max), t a = C40c to 25c C 3 C % lifetime drift characteristics sensitivity error lifetime drift e sens_drift C 2 C % total output error lifetime drift e tot_drift C 2 C % *percentage of i p , with i p = i pr (max) high accuracy, galvanically isolated current sensor ic with small footprint soic8 package ACS722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
11 sensitivity (sens). the change in sensor ic output in response to a 1 a change through the primary conductor. the sensitivity is the product of the magnetic circuit sensitivity (g / a) (1 g = 0.1 mt) and the linear ic amplifier gain (mv/g). the linear ic ampli - fier gain is programmed at the factory to optimize the sensitivity (mv/a) for the full-scale current of the device. nonlinearity (e lin ). the nonlinearity is a measure of how linear the output of the sensor ic is over the full current measurement range. the nonlinearity is calculated as: 1? [ { [ { v iout (i pr (max)) ? v iout(q) 100 (%) e lin = 2 v iout (i pr (max)/2) ? v iout(q) where v iout (i pr (max)) is the output of the sensor ic with the maximum measurement current flowing through it and v iout (i pr (max)/2) is the output of the sensor ic with half of the maximum measurement current flowing through it. zero current output voltage (v iout(q) ). the output of the sensor when the primary current is zero. for a unipolar supply voltage, it nominally remains at 0.5 v cc for a bidirectional device and 0.1 v cc for a unidirectional device. for example, in the case of a bidirectional output device, v cc = 3.3 v translates into v iout(q) = 1.65 v. variation in v iout(q) can be attributed to the resolution of the allegro linear ic quiescent voltage trim and thermal drift. offset voltage (v oe ). the deviation of the device output from its ideal quiescent value of 0.5 v cc (bidirectional) or 0.1 v cc (unidirectional) due to nonmagnetic causes. to convert this volt - age to amperes, divide by the device sensitivity, sens. total output error (e tot ). the difference between the cur - rent measurement from the sensor ic and the actual current (i p ), relative to the actual current. this is equivalent to the difference between the ideal output voltage and the actual output voltage, divided by the ideal sensitivity, relative to the current flowing through the primary conduction path: e tot (i p ) v iout_ideal (i p ) ? v iout (i p ) sens ideal (i p ) i p 100 (%) = the total output error incorporates all sources of error and is a function of i p . at relatively high currents, e tot will be mostly due to sensitivity error, and at relatively low currents, e tot will be mostly due to offset voltage (v oe ). in fact, at i p = 0, e tot approaches infinity due to the offset. this is illustrated in figures 1 and 2. figure 1 shows a distribution of output voltages versus i p at 25c and across temperature. figure 2 shows the correspond - ing e tot versus i p . definitions of accuracy characteristics 0 a decreasing v iout (v) accuracy across temperature accuracy across temperature accuracy across temperature accuracy at 25c only accuracy at 25c only accuracy at 25c only increasing v iout (v) ideal v iout i pr (min) i pr (max) +i p (a) ?i p (a) v iout(q) full scale i p +i p ?i p +e t o t ?e t o t across t e m p e r a t u r e 25c only high accuracy, galvanically isolated current sensor ic with small footprint soic8 package ACS722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
12 definitions of dynamic response characteristics power-on time (t po ). when the supply is ramped to its operat - ing voltage, the device requires a finite time to power its internal components before responding to an input magnetic field. power-on time, t po , is defined as the time it takes for the output voltage to settle within 10% of its steady state value under an applied magnetic field, after the power supply has reached its minimum specified operating voltage, v cc (min), as shown in the chart at right. rise time (t r ). the time interval between a) when the sensor ic reaches 10% of its full scale value, and b) when it reaches 90% of its full scale value. the rise time to a step response is used to derive the bandwidth of the current sensor ic, in which ?(C3 db) = 0.35 / t r . both t r and t response are detrimentally affected by eddy current losses observed in the conductive ic ground plane. response time (t response ). the time interval between a) when the primary current signal reaches 90% of its final value, and b) when the device reaches 90% of its output corresponding to the applied current. propagation delay ( t pd ). the propagation delay is measured as the time interval a) when the primary current signal reaches 20% of its final value, and b) when the device reaches 20% of its output corresponding to the applied current. v iout v t v cc v cc (min.) 90% v iout 0 t 1 = time at which power supply reaches minimum specified operating voltage t 2 = time at which output voltage settles within 10% of its steady state value under an applied magnetic field t 1 t 2 t po v cc (typ.) primary current v iout 90 0 (%) response time, t response t primary current v iout 90 10 20 0 (%) propagation delay, t pd rise time, t r t figure 3: power-on time (t po ) ) and propagation delay ( ) ) high accuracy, galvanically isolated current sensor ic with small footprint soic8 package ACS722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
13 figure 6: package lc, 8-pin soicn c 1.27 bsc a b b c 2 1 8 branding scale and appearance at supplier discretion c sea ting plane c 0.10 8x 0.25 bsc 1.04 ref 1.75 max 1.75 4.90 0.10 3.90 0.10 6.00 0.20 0.51 0.31 0.25 0.10 0.25 0.17 1.27 0.40 8 0 a standard branding reference v iew 2 1 1 8 c 0.65 1.27 5.60 branded face for reference only ? not for t ooling use (reference ms-012aa) dimensions in millimeters ? not to scale dimensions exclusive of mold ?ash, gate burrs, and dambar protrusions exact case and lead con?guration at supplier discretion within limits show n sea ting plane gauge plane pcb layout reference v iew nnnnnnn tpp-aaa lllll n = device part numbe r t= device temperature rang e p= package designator a=amperage l= lot number belly brand = country of origin te rminal #1 mark area reference land pattern layout (reference ipc7351 soic127p600x175-8m); all pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary to meet application process requirements and pcb layout tolerances package outline drawing high accuracy, galvanically isolated current sensor ic with small footprint soic8 package ACS722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
14 for the latest version of this document, visit our website: www.allegromicro.com copyright ?2011-2014, allegro microsystems, llc allegro microsystems, llc reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. before placing an order, the user is cautioned to verify that the information being relied upon is current. allegros products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of allegros product can reasonably be expected to cause bodily harm. the information included herein is believed to be accurate and reliable. however, allegro microsystems, llc assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use. revision history revision revision date description of revision C june 10, 2014 initial release. high accuracy, galvanically isolated current sensor ic with small footprint soic8 package ACS722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com

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