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general description the max9922/max9923 ultra-precision, high-side cur- rent-sense amplifiers feature ultra-low offset voltage (v os ) of 25? (max) and laser-trimmed gain accuracy better than 0.5%. the combination of low v os and high- gain accuracy allows precise current measurements even at very small sense voltages. the max9922/max9923 are capable of both unidirec- tional and bidirectional operation. for unidirectional operation, connect ref to gnd. for bidirectional oper- ation, connect ref to v dd /2. the max9922 has adjustable gain set with two external resistors. the max9923t/max9923h/max9923f use an internal laser-trimmed resistor for fixed gain of 25v/v, 100v/v, and 250v/v, respectively. the devices operate from a +2.85v to +5.5v single supply, independent of the input common-mode voltage, and draw only 700? operating supply current and less than 1? in shutdown. the +1.9v to +28v current-sense input common-mode voltage range makes the max9922/max9923 ideal for current monitoring in applications where high accuracy, large common-mode measurement range, and mini- mum full-scale v sense voltage is critical. the max9922/max9923 use a spread-spectrum autozeroing technique that constantly measures and cancels the input offset voltage, eliminating drift over time and temperature, and the effect of 1/f noise. this, in conjunction with the indirect current-feedback tech- nique, achieves less than 25? (max) offset voltage. the max9922/max9923 are available in a small 10-pin ?ax package and are specified over the -40? to +85? extended temperature range. applications notebook/desktop power management handheld li+ battery current monitoring precision current sources features ? ultra-precision v os over temperature max9922: ?0? (max) max9923t: ?5? (max) max9923h: ?0? (max) max9923f: ?0? (max) ? ?.5% (max) full-scale gain accuracy ? bidirectional or unidirectional i sense ? multiple gains available adjustable (max9922) +25v/v (max9923t) +100v/v (max9923h) +250v/v (max9923f) ? 1.9v to 28v input common-mode voltage, independent of v dd ? supply voltage: +2.85v to +5.5v ? 700? supply current, 1? shutdown current ? extended temperature range (-40? to +85?) ? available in space-saving 10-pin ?ax max9922/max9923 ultra-precision, high-side current-sense amplifiers ________________________________________________________________ maxim integrated products 1 ordering information 19-4429; rev 1; 1/10 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. + denotes a lead(pb)-free/rohs-compliant package. evaluation kit available part pin- package temp range gain (v/v) max9922 eub+ 10 ?ax - 40c to + 85 c adjustable max9923 teub+ 10 ?ax - 40c to + 85 c 25 max9923heub+ 10 ?ax - 40c to + 85 c 100 max9923feub+ 10 ?ax - 40c to + 85 c 250 pin configuration 1 2 3 4 5 10 9 8 7 6 v dd out fb ref n.c. rs- rs+ rsb max9922 max9923t max9923h max9923f max top view gnd shdn + typical operating circuits appear at end of data sheet. ?ax is a registered trademark of maxim integrated products, inc.
max9922/max9923 ultra-precision, high-side current-sense amplifiers 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v rsb = v rs+ = v rs- = +12v, v dd = +3.3v, v gnd = 0v, v ref = v dd /2 for bidirectional, v ref = 0v for unidirectional, v sense = v rs+ - v rs- = 0v, max9922 is set for a v =100v/v (r1 = 1k ? , r2 = 99k ? ), shdn = v dd , t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. rsb, rs+, rs- to gnd...........................................-0.3v to +30v v dd to gnd ..............................................................-0.3v to +6v out, ref, fb, shdn to gnd .................-0.3v to the lower of (v dd + 0.3v) and +6v out short circuit to v dd or gnd ..............................continuous differential voltage (v rs+ - v rs- ), (v rsb - v rs+ ), (v rsb - v rs- ) ...................................................................?.5v current into any pin..........................................................?0ma continuous power dissipation (t a = +70?) 10-pin ?ax (derate 4.5mw/? above +70?) ...........362mw operating temperature range ...........................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units dc characteristics max9922 (a v = 100), v sense = 0v, v ref = v dd /2, -40 c t a +85 c ?.1 ?0 max9923t, v sense = 0v, v ref = v dd /2, -40 c t a +85 c ?.2 ?5 max9923h, v sense = 0v, v ref = v dd /2 -40 c t a +85 c ?.2 ?0 input offset voltage (notes 2, 3) v os max9923f, v sense = 0v, v ref = v dd /2, -40 c t a +85 c ?.1 ?0 ? max9922 (a v = 100v/v), v sense = 0v, v ref = v dd /2, -40 c t a +85 c ?.05 max9923t, v sense = 0v, v ref = v dd /2, -40 c t a +85 c ?.20 max9923h, v sense = 0v, v ref = v dd /2, -40 c t a +85 c ?.10 input offset voltage temperature drift (notes 2, 4) tcv os max9923f, v sense = 0v, v ref = v dd /2, -40 c t a +85 c ?.05 ?/ c input common-mode range v cmr guaranteed by cmrr 1.90 28.00 v input common-mode rejection cmrr 1.9v v rs+ 28v, -40 c t a +85 c (note 2) 121 140 db max9922 adj max9923t 25 max9923h 100 gain a v max9923f 250 v/v
max9922/max9923 ultra-precision, high-side current-sense amplifiers _______________________________________________________________________________________ 3 electrical characteristics (continued) (v rsb = v rs+ = v rs- = +12v, v dd = +3.3v, v gnd = 0v, v ref = v dd /2 for bidirectional, v ref = 0v for unidirectional, v sense = v rs+ - v rs- = 0v, max9922 is set for a v =100v/v (r1 = 1k ? , r2 = 99k ? ), shdn = v dd , t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter symbol conditions min typ max units t a = +25 c ?.17 ?.40 max9922 (a v = 100) -40 c t a +85 c ?.60 t a = +25 c ?.12 ?.30 max9923t -40 c t a +85 c ?.60 t a = +25 c ?.24 ?.40 max9923h -40 c t a +85 c ?.75 t a = +25 c ?.21 ?.50 gain accuracy (note 5) ? a v max9923f -40 c t a +85 c ?.80 % max9922 (a v = 100) ?.06 max9923t ?.04 max9923h ?.06 gain nonlinearity ~a v max9923f ?.12 % open-loop gain a vol max9922 160 db input bias current i rs+ , i rs - 1pa fb bias current i fb max9922 1 pa fb resistance r fb max9923t/max9923h/max9923f resistance between fb and ref 1k ? t a = +25 c0 v dd - 1.4 ref input range guaranteed by ref cmrr test -40 c t a +85 c0 v dd - 1.6 v ref common-mode rejection ratio 0 ref v dd - 1.4v (note 2) 94 100 db max9922 (bidirectional) 20 max9923t (bidirectional) 60 70 max9923h (bidirectional) 16 20 ref input current (note 6) max9923f (bidirectional) 6 7 ? r l = 10k ? to gnd and ref = gnd 730 out high voltage v oh v oh = v dd ?v out (note 7) r l = 10k ? to v dd and ref = v dd - 1.4 16 mv r l = 10k ? to gnd and ref = gnd 1 10 out low voltage (note 7) v ol r l = 10k ? to v dd and ref = v dd - 1.4 6 30 mv shdn logic-low v il v dd = 5.5v 0.3 v shdn logic-high v ih v dd = 5.5v 0.6 x v dd v shdn input current i ih /i il 0.001 ? ?
max9922/max9923 ultra-precision, high-side current-sense amplifiers 4 _______________________________________________________________________________________ electrical characteristics (continued) (v rsb = v rs+ = v rs- = +12v, v dd = +3.3v, v gnd = 0v, v ref = v dd /2 for bidirectional, v ref = 0v for unidirectional, v sense = v rs+ - v rs- = 0v, max9922 is set for a v =100v/v (r1 = 1k ? , r2 = 99k ? ), shdn = v dd , t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter symbol conditions min typ max units ac characteristics max9922 10 max9923t 50 v sense = 10mv p-p max9923h 10 -3db small-signal bandwidth bw v sense = 5mv p-p max9923f 2.5 khz slew rate sr ? v out = 2v, c load = 100pf 0.4 v/? max9922 200 max9923t 100 max9923h 200 out settling time to 1% of final value c load = 7pf max9923f 400 ? input-voltage noise peak-to-peak f o = 0.1hz to 10hz 3.4 ? p-p autozeroing clock frequency f c pseudo-random 20 khz capacitive-load stability no sustained oscillations 200 pf power-supply characteristics supply voltage range v dd guaranteed by psrr 2.85 5.50 v power-supply rejection ratio psrr 2.85v v dd 5.5v, -40 c t a +85 c (note 2) 93 99 db v dd = 5.0v 780 1300 i dd v dd = 3.0v 700 1500 quiescent supply current i rsb v rsb = 12v 200 300 ? i dd_sd v shdn = 0.3v 0.05 1 shutdown supply current i rsb_sd v shdn = 0.3v, v rsb = 28v 0.05 1 ? power-down input current i rs+l , i rs-l v dd = v ref = 0v, v rsb = v rs+ = v rs- = 28v 0.01 0.1 ?
max9922/max9923 ultra-precision, high-side current-sense amplifiers _______________________________________________________________________________________ 5 note 1: all devices are 100% production tested at t a = +85?. all temperature limits are guaranteed by design. note 2: v os is measured in bidirectional mode with v ref = v dd /2. note 3: data sheet limits are guaranteed by design and bench characterization. thermocouple effects preclude measurement of this parameter during production testing. devices are screened during production testing to eliminate defective units. note 4: v os drift limits are guaranteed by design and bench characterization and are the average of drift from -40? to +25? and from +25? to +85?. note 5: v rsb = v rs+ = 12v, v ref = v dd /2 for bipolar mode and v ref = 0v for unipolar mode. gain accuracy and gain linearity are specified over a v sense range that keeps the output voltage 250mv away from the rails to achieve full accuracy. output of the part is rail-to-rail, and goes to within 25mv of the rails, but accuracy is not maintained. linear operation is not guaran- teed for v sense voltages > ?50mv. see the typical operating characteristics section for plots of input vs. output. note 6: this is the worst-case ref current needed to directly drive the bottom terminal of the gain setting resistors, at v dd = 3.3v, and v ref = v dd /2 while maintaining gain accuracy. an internal 1k ? resistor (r1) is present in the max9923t/ max9923h/max9923f between the fb and ref pins, while in the max9922 the resistor is external and user selectable. a voltage identical to the v sense develops across this resistor. in all versions the ref input current is dependent on the mag- nitude and polarity of v sense , and in the max9922 it is dependent on the value of the external resistor as well. the input bias current for ref is typically 1pa in the max9922 since it connects to the gate of a mos transistor. see the external reference section for more details. note 7: the range of v ref , v cm , and v sense may limit the output swing of the max9922 with adjustable gain set to less than 100v/v. electrical characteristics (continued) (v rsb = v rs+ = v rs- = +12v, v dd = +3.3v, v gnd = 0v, v ref = v dd /2 for bidirectional, v ref = 0v for unidirectional, v sense = v rs+ - v rs- = 0v, max9922 is set for a v =100v/v (r1 = 1k ? , r2 = 99k ? ), shdn = v dd , t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter symbol conditions min typ max units power-down supply current i rsbl v dd = v ref = 0v, v rsb = v rs+ = v rs- = 28v 0.05 1 a power-up time max9922, a v = 100v/v, v ref = 0v, v sense = 10mv, v dd = 0v to 3.3v, settling to 0.1% of final value 800 ?
max9922/max9923 ultra-precision, high-side current-sense amplifiers 6 _______________________________________________________________________________________ typical operating characteristics (v dd = 3.3v, v shdn = v dd , v rsb = v rs+ = v rs- = 12v, t a = +25?, unless otherwise noted.) max9922 unipolar gain accuracy histogram max9922/23 toc01 gain accuracy (%) n (%) 0.3 0.2 0.1 0 -0.4 -0.3 -0.2 -0.1 -0.5 10 20 30 40 60 50 90 80 70 0 0.5 0.4 max9922 input offset voltage histogram max9922/23 toc02 v os ( v) n (%) 6 4 2 0 -8 -6 -4 -2 -10 10 20 30 40 60 50 0 10 8 max9922 offset voltage drift histogram max9922/23 toc03 tcv os (nv/ c) n (%) 30 20 10 0 -40 -30 -20 -10 -50 10 20 30 40 60 50 0 50 40 input referred offset vs. input common-mode voltage max9922/23 toc04 input common mode (v) offset voltage ( v) 24 20 4 8 12 16 -6 -4 -2 0 2 4 6 8 -8 028 max9922 input vs. output max9922/23 toc05 differential input (mv) output-ref (v) 150 -150 0 50 -50 -1.5 -1.0 -0.5 0 0.5 1.0 1.5 2.0 -2.0 -250 250 r f = 100k ? r g = 20k ? max9922 input vs. output max9922/23 toc06 differential input (mv) output-ref (v) 15 -15 0 5 -5 -1.5 -1.0 -0.5 0 0.5 1.0 1.5 2.0 -2.0 -25 25 r f = 100k ? r g = 1k ? gain error vs. input common-mode voltage max9922/23 toc07 input common mode (v) gain error (%) ref = gnd v oh /v ol vs. i oh /i ol max9922/23 toc08 output current (ma) v oh /v ol (v) 8 6 4 2 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0 010 v oh v ol
max9922/max9923 ultra-precision, high-side current-sense amplifiers _______________________________________________________________________________________ 7 typical operating characteristics (continued) (v dd = 3.3v, v shdn = v dd , v rsb = v rs+ = v rs- = 12v, t a = +25?, unless otherwise noted.) rsb current vs. temperature max9922/23 toc10 temperature ( c) supply current (ma) 60 35 10 -15 0.1 0.2 0.3 0.4 0 -40 85 v rsb = 12v v rsb = 28v v rsb = 1.9v 0 10 5 20 15 25 30 -40 10 -15 35 60 85 shutdown supply current vs. temperature max9922/23 toc11 temperature ( c) supply current (na) v dd = 3.3v v dd = 5.5v v dd = 2.85v max9922 gain vs. frequency max9922/23 toc12 frequency (hz) gain (db) 100e+3 10e+3 1e+3 100e+0 10e+0 1e+0 100e-3 20 40 60 80 100 120 140 0 10e-3 1e+6 gain = open loop gain = 1000 input cmrr vs. frequency max9922/23 toc13 frequency (hz) cmrr (db) 10e+3 1e+3 100e+0 10e+0 -120 -130 -110 -100 -90 -80 -70 -60 -140 1e+0 100e+3 psrr vs. frequency max9922/23 toc14 frequency (hz) psrr (db) 10e+3 1e+3 100e+0 10e+0 -130 -120 -110 -100 -90 -80 -70 -60 -140 1e+0 100e+3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 -40 -15 10 35 60 85 supply current vs. temperature max9922/23 toc09 temperature ( c) supply current (ma) v dd = 5.5v v dd = 2.85v v dd = 3.3v
max9922/max9923 ultra-precision, high-side current-sense amplifiers 8 _______________________________________________________________________________________ input noise density vs. frequency max9922/23 toc15 frequency (hz) 10,000 1,000 100 50 100 150 200 250 0 10 100,000 noise density (nv/ hz) 32khz spike energy = 4.3 vrms 1s/div peak-to-peak noise (0.1hz to 10hz) max9922/23 toc16 1.25 v/div large signal input step response (max9922, a v = 100) max9922/23 toc17 time (200 s/div) input (10mv/div) output (1v/div) 0v 0v power-on response (max9922, a v = 100) max9922/23 toc18 time (80 s/div) out (500mv/div) v dd (1v/div) v sense = 10mv 0v 0v shutdown on/off transient (max9922, a v = 100) max9922/23 toc19 time (200 s/div) shdn (1v/div) output (500mv/div) v sense = 10mv 0v 0v typical operating characteristics (continued) (v dd = 3.3v, v shdn = v dd , v rsb = v rs+ = v rs- = 12v, t a = +25?, unless otherwise noted.)
max9922/max9923 ultra-precision, high-side current-sense amplifiers _______________________________________________________________________________________ 9 typical operating characteristics (continued) (v dd = 3.3v, v shdn = v dd , v rsb = v rs+ = v rs- = 12v, t a = +25?, unless otherwise noted.) pin description pin name function 1 rsb current-sense amplifier input stage supply. connect to either rs+ or rs-. 2 rs+ current-sense amplifier positive input 3 rs- current-sense amplifier negative input 4 n.c. no connection. not internally connected. 5 gnd ground 6 shdn shutdown logic input. connect to gnd to reduce quiescent current to 1?. connect to v dd for normal operation. 7 ref reference voltage input. connect to an external voltage to provide a bidirectional current-sense output. connect to gnd for unidirectional operation. 8fb gain-set feedback input. connect an optional noise reduction capacitor between out and fb. max9922: adjustable gain. connect a resistive-divider feedback network between out, fb, and ref to set the current-sense amplifier gain. use an external combination of r1 and r2 resistors for gain = 1 + (r2/r1). max9923t/max9923h/max9923f: fixed gain. see the functional diagrams. 9 out voltage output. v out is proportional to v sense . 10 v dd power-supply voltage input. bypass to gnd with a 0.1? capacitor. overload recovery (output limiting) (max9922, a v = 100) max9922/23 toc21 time (150 s/div) input (50mv/div) output (1v/div) 0v 0v saturation/overload recovery (input limited) (max9922) max9922/23 toc20 time (200 s/div) input (100mv/div) output (1v/div) gain = 5v/v 0v 0v
max9922/max9923 ultra-precision, high-side current-sense amplifiers 10 ______________________________________________________________________________________ detailed description the max9922/max9923 high-side, current-sense amplifiers implement a spread-spectrum autozeroing technique that minimizes the input offset error, offset drift over time and temperature, and the effect of 1/f noise. this technique achieves less than 25? (max) offset voltage. the max9922/max9923 high-side current-sense ampli- fiers feature a +1.9v to +28v input common-mode range that is independent of supply voltage (v dd ). this feature allows the monitoring of current out of a battery as low as +1.9v and enables high-side current sensing at voltages greater than the supply voltage. the max9922/max9923 monitor current through a cur- rent-sense resistor and amplify the voltage across the resistor. the 28v input common-mode voltage (v rs+ ) range of the max9922/max9923 is independent of the supply voltage (v dd ). high-side current monitoring does not interfere with the ground path of the load being measured, making the max9922/max9923 par- ticularly useful in a wide range of high-voltage systems. the max9922/max9923 use maxim? indirect current feedback achitecture. this architecture con- verts the differential input voltage signal to a current through an input transconductance stage. an output transconductance stage converts a portion of the output voltage (equal to the output voltage divided by the gain) into another precision current. these two currents are subtracted and the result is fed to a loop amplifier with sufficient gain to minimize errors (see the functional diagrams.) battery-powered systems require a precise bidirection- al current-sense amplifier to accurately monitor the bat- tery? charge and discharge currents. measurements of out with respect to v ref yield a positive and negative voltage during charge and discharge cycles (figure 1). the max9922 allows adjustable gain with a pair of exter- nal resistors between out, fb, and ref. the max9923t/ max9923h/max9923f use laser-trimmed internal resis- tors for fixed gains of 25, 100, and 250, respectively, with 0.5% gain accuracy (see the functional diagrams. ) functional diagrams max9922 rsb 1 rs- rs+ 2 3 n.c. 4 gnd 5 v dd 10 r2 r1 out fb ref 9 8 7 shdn 6 gain = 1 + ( r2 ) r1 max9923 rsb 1 rs- rs+ 2 3 n.c. 4 gnd 5 v dd 10 r2 r1 shdn 6 out 9 fb 8 ref 7 max9923 version gain t25 h 100 f 250
max9922/max9923 ultra-precision, high-side current-sense amplifiers ______________________________________________________________________________________ 11 shutdown the max9922/max9923 feature a logic shutdown input to reduce the supply current to less than 1?. drive shdn high for normal operation. drive shdn low to place the device in shutdown mode. in shutdown mode, the current drawn from both the v dd input and the current-sense amplifier inputs (rsb, rs+, and rs-) is less than 1? each. external reference the max9922/max9923 are capable of both unidirec- tional and bidirectional operation. for unidirectional current-sense applications, connect the ref input to gnd. for bidirectional, connect ref to a reference. this sets bidirectional current sense with v out = v ref for v sense = 0mv. positive v sense causes out to swing toward the positive supply, while negative v sense causes out to swing toward gnd. this feature allows the output voltage to measure both charge and discharge currents. use v ref = v dd /2 for maximum dynamic range. in bidirectional operation, the external voltage applied to v ref has to be able to supply the current in the feed- back network between out, fb, and ref. this current is simply the input sense voltage divided by the resis- tance between fb and ref (1k ? typical for max9923). furthermore, ensure the external voltage source sup- plied to ref has a low source resistance to prevent gain errors (e.g., use a stand-alone reference voltage or an op amp to buffer a high-value resistor string.) see the typical operating circuits . input differential signal range the max9922/max9923 feature a proprietary input structure optimized for small differential signals as low as 10mv full scale for high efficiency with lowest power dissipation in the sense resistor, or +100mv full scale for high dynamic range. the output of the max9922/ max9923 allows for bipolar input differential signals. gain accuracy is specified over the v sense range to keep the output voltage 250mv away from the rails to achieve full accuracy. output of the part is rail-to-rail and goes to within 25mv of the rails, but accuracy is not maintained. linear operation is not guaranteed for input sense voltages greater than ?50mv. applications information power supply, bypassing, and layout good layout technique optimizes performance by decreasing the amount of stray capacitance at the high-side, current-sense amplifier gain-setting pins, fb to ref and fb to gnd. capacitive decoupling between v dd to gnd of 0.1? is recommended. since the max9922/max9923 feature ultra-low input offset volt- age, board leakage and thermocouple effects can easi- ly introduce errors in the input offset voltage readings when used with high-impedance signal sources. minimize board leakage current and thermocouple effects by thoroughly cleaning the board and placing the matching components very close to each other and with appropriate orientation. for noisy digital environ- ments, the use of a multilayer printed circuit board (pcb) with separate ground and power-supply planes is recommended. keep digital signals far away from the sensitive analog inputs. unshielded long traces at the input and feedback terminals of the amplifier can degrade performance due to noise pick-up. v out - v ref a v = 100 5v 2.5v -2.5v -25mv 0 25mv discharge current charge current v out = r sense x ( 1 + r2 ) x i sense + v ref r1 figure 1. bidirectional current-sense transfer function
max9922/max9923 ultra-precision, high-side current-sense amplifiers 12 ______________________________________________________________________________________ optional noise reduction capacitor a noise reduction capacitance of ~1nf can be con- nected between out and fb, if needed. noise reduc- tion is achieved by both limiting the amplifier bandwidth, reducing contribution of broadband white noise and by attenuating contribution of any small 20khz autozero ripple that appears at the output. using higher values of feedback capacitance reduces the output noise of the amplifier, but also reduces its signal bandwidth. efficiency and power dissipation at high current levels, the i 2 r losses in r sense can be significant. take this into consideration when choosing the resistor value and its power dissipation (wattage) rating. the sense resistor? value will drift if it is allowed to heat up excessively. the precision v os of the max9922/max9923 allows the use of small sense resis- tors to reduce power dissipation and reduce hot spots. sense resistor connections take care to prevent solder and trace resistance from causing errors in the sensed voltage because of the high currents that flow through r sense . either use a four termi- nal current-sense resistor or use kelvin (force and sense) pcb layout techniques to minimize these errors.
max9922/max9923 ultra-precision, high-side current-sense amplifiers ______________________________________________________________________________________ 13 chip information process: bicmos unidirectional mode max9923t max9923h max9923f gnd out rs+ rs- rsb *optional noise reduction fb v dd 3.3v shdn on off 1nf* ref 12-bit adc v sense r load batt 1.9v to 28v typical operating circuits bidirectional mode max9923t max9923h max9923f gnd out rs+ rs- rsb ref *optional noise reduction fb v dd 3.3v shdn on off 1nf* 1.25v v ref = 2.5v 12-bit adc to wall-cube/charger v sense r load batt 1.9v to 28v
max9922/max9923 ultra-precision, high-side current-sense amplifiers 14 ______________________________________________________________________________________ package information for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to th e package regardless of rohs status. package type package code document no. 10 ?ax u10-2 21-0061 10lumax.eps
max9922/max9923 ultra-precision, high-side current-sense amplifiers maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 15 2010 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 3/09 initial release 1 1/10 updated conditions for ref input current and note 6 3, 5

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