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R5437/r5438l li-ion/polymer 1/2/3-cell protector second protection ic no.ea-324-140808 1 outlines R5437/r5438 series are cmos-based high voltage toler ant over-charge protection ics for li-ion/li-polymer secondary battery. the R5437/r5438 can detect overcharge of 1-cell to 3-cell li-ion/ li-polymer batteries. the R5437/r5438 is consists of 3 voltage detectors, a vo ltage reference unit, an internal voltage regulator, an oscillator, a counter, a delay circuit, a logic circuit. when the over-charge is detected, after the ic internally fixed delay time, the output of c out becomes "h". after detecting over-charge, when the cell voltage beco mes lower than the over-cha rge released voltage, the over-charge state is released. if all the cells voltages become equal or less than the s hutdown detector threshold, all the circuits are halted and shut down, as a result, the consumption current of ic itself (shutdown curren t) is extremely reduced. the output type is cmos. features ? manufactured with high voltage tolerant process ...... absolute maximum rating 26v ? low supply current ........................................... cell voltage 3. 9v, for 3-cell typ. 0.85a ? high accuracy detector threshold .................... ov er-charge detector (ta=25c) 20mv (ta=0 to 60c) 25mv ? variety of detector threshold over-charge detector threshold 4.1v-4.6v step of 0.005v (v det1 n) (n=1, 2, 3) over-charge released voltage v det1 n-0v to v det1 n-0.5v step of 0.05v (v rel1 n) (n=1, 2, 3) ? setting of output delay time ............................. over-charge detector output delay options 2, 4, 6s(built-in delay) ? shutdown function ............................................ when all the cell voltages becom e equal or less than shutdown detector threshold, the ic will be into s hutdown mode and the consumptio n current of ic itself becomes extremely small. even if one of the cells becomes equal or more than shut down released voltage, the shutdown mode is released. ? shutdown detector thres hold ............................ typ. 3.5v0.3v ? shutdown release hysteresis .......................... none ? shutdown current .............................................. max. 0.1 a ? 1/2/3 cell protection enabl er .............................. by external wiring, 1 or 2 or 3-cell protection can be selected. ? over-charge releas ed condition ........................ released by voltage type ? c out output ........................................................ c out : 4.7v regulator power supply cmos output. active "h" ? delay time shortening function ....................... by applying the volt age of 4v0.2v to vdd-vc1, over-charge and released delay time can be shortened to 1/90. ? small package .................................................. dfn1814-6
R5437/r5438l 2 block diagram vc1 vc2 vc3 vd1-1 vd1-2 vd1-3 regulator vdd logic circuit oscillator counter vss cout vr vr vr shutdown shutdown shutdown logic circuit
R5437/r5438l 3 selection guide in the R5437/r5438lxxxxx series, input threshold of over-charge and out put delay time can be designated according to the application. part number is designated as follows: (ex.) R5437l 301ba part number a b c d code contents a package type l: dfn1814-6 b serial number for the R5437/r5438 series desi gnating input threshold for over-charge detector c designation of output delay option d designation of version symbols. R5437 code list code v det1 n(v) *1 v rel1 n(v) *1 tv det1 (s) R5437l 301aa 4.450 4.150 2 R5437l 301ba 4.450 4.150 4 R5437l 303aa 4.350 4.050 2 R5437l 303ba 4.350 4.050 4 R5437l 303ca 4.350 4.050 6 R5437l 304aa 4.400 4.100 2 R5437l 304ba 4.400 4.100 4 R5437l 305aa 4.300 4.000 2 R5437l 305ba 4.300 4.000 4 R5437l 306ca 4.450 3.950 6 R5437l 307ca 4.500 4.100 6 R5437l 312aa 4.550 4.150 2 R5437l 312ba 4.550 4.150 4 *1 n 1, 2, 3
R5437/r5438l 4 r5438 code list code v det1 n(v) *1 v rel1 n(v) *1 tv det1 (s) r5438l 301aa 4.450 4.150 2 r5438l 301ba 4.450 4.150 4 r5438l 303aa 4.350 4.050 2 r5438l 303ba 4.350 4.050 4 r5438l 304aa 4.400 4.100 2 r5438l 304ba 4.400 4.100 4 r5438l 305aa 4.300 4.000 2 r5438l 305ba 4.300 4.000 4 r5438l 306ca 4.450 3.950 6 r5438l 308ba 4.400 4.000 4 r5438l 312aa 4.550 4.150 2 r5438l 312ba 4.550 4.150 4 *1 n 1, 2, 3
R5437/r5438l 5 pin configurations dfn1814-6 pin description R5437 pin no. symbol description 1 v c1 positive terminal pin for cell-1 2 v c2 positive terminal pin for cell-2 3 v ss v ss pin. ground pin for the ic 4 v c3 positive terminal pin for cell-3 5 v dd v dd pin 6 c out output pin of over-charge detection r5438 pin no. symbol description 1 c out output pin of over-charge detection 2 v dd v dd pin 3 v c1 positive terminal pin for cell-1 4 v c2 positive terminal pin for cell-2 5 v c3 positive terminal pin for cell-3 6 v ss v ss pin. ground pin for the ic 654 123
R5437/r5438l 6 absolute maximum ratings ta = 2 5 c, v ss =0v symbol item ratings unit v dd supply voltage v c1 -0.3 to v c1 +6.5 v c1 -0.3 to 26 v v c1 v c2 v c3 input voltage positive input pin voltage for cell-1 positive input pin voltage for cell-2 positive input pin voltage for cell-3 v c2 -0.3 to v c2 +6.5 v c3 ?0.3 to v c3 +6.5 ?0.3 to 6.5 v v cout output voltage c out pin voltage -0.3 to v oh1 +0.3 v p d power dissipation 150 mw ta operating temperature range -40 to 85 c ts t g storage temperature range -55 to 125 c *note: exposure to the condition exceeded absolute maximum ratings may cause the permanent damages and affects the reliability and safety of both devic e and systems using the device. the functional operations cannot be guaranteed beyond specifi ed values in the recommended conditions.
R5437/r5438l 7 electrical characteristics unless otherwise specified, ta=25c symbol item conditions min. typ. max. unit te s t circuit v dd1 operating input voltage voltage defined as v dd -v ss 1.5 20 v v det1 n celln over-charge threshold (n=1,2,3) detect rising edge of supply voltage (25 c) v det1 n -0.020 v det1 n v det1 n +0.020 v a detect rising edge of supply voltage (0 to 60 c) *note1 v det1 n -0.025 v det1 n +0.025 v rel1 n celln over-charge released voltage (n=1,2,3) detect falling edge of supply voltage v rel1 n -0.050 v rel1 n v rel1 n +0.050 v a tv det1 output delay of over-charge v c ell n =3.9v, v cell 1 =3.9v to 4.7v (n=2,3) *note2 tv det1 0.8 tv det1 tv det1 1.2 s b tv rel1 output delay of release from over-charge v c ell n =3.9v, v cell 1 =4.7v to 3.9v (n=2,3) tv rel1 0.8 tv rel1 tv rel1 1.2 ms b v sht shutdown detector threshold detect falling edge 3.2 3.5 3.8 v c v oh1 c out pch on voltage1 i oh =0 recommended operating conditions (electrical characteristics) all of electronic equipment should be designed that the mounted semiconductor devices operate within the recommended operating conditions. the semiconductor devices cannot operate normally over the recommended operating conditions, even if when they are used over such conditions by momentary electronic noise or surge. and the semiconductor de vices may receive serious damage when they continue to operate over the recommended operating conditions.
R5437/r5438l 8 ta=-40 ~ 85c symbol item conditions min. typ. max. unit te s t circuit v dd1 operating input voltage voltage defined as v dd -v ss 1.5 20 v v det1 n celln over-charge threshold (n=1,2,3) detect rising edge of supply voltage v det1 n -0.038 v det1 n v det1 n +0.037 v a v rel1 n celln over-charge released voltage (n=1,2,3) detect falling edge of supply voltage v rel1 n -0.069 v rel1 n v rel1 n +0.067 v a tv det1 output delay of over-charge v c ell n =3.9v, v cell 1 =3.9v to 4.7v (n=2,3) *note1 tv det1 0.54 tv det1 tv det1 1.39 s b tv rel1 output delay of release from over-charge v c ell n =3.9v, v cell 1 =4.7v to 3.9v (n=2,3) tv rel1 0.54 tv rel1 tv rel1 1.39 ms b v sht shutdown detector threshold detect falling edge 3.120 3.5 3.878 v c v oh1 c out pch on voltage1 i oh =0 note: all of this specification is guar anteed by design, not mass production tested.
R5437/r5438l 9 test circuits a v c1 v c2 v ss v dd c out v v oscilloscop e v v c3 b v c1 v c2 v ss v dd c out v oscilloscop e v c3 c v c1 v c2 v ss v dd c out v v v v c3 a a a d v c1 v c2 v ss v dd c out v c3 v e v c1 v c2 v ss v dd c out v c3 v a f v c1 v c2 v ss v dd c out v c3 v a
R5437/r5438l 10 g v c1 v c2 v ss v dd c out v c3 a
R5437/r5438l 11 operation ? vdet1n / over-charge detectors (n=1, 2, 3) while the cells are charged, the voltage between v c1 pin and v c2 pin (voltage of the cell-1), the voltage between v c2 pin and v c3 pin (voltage of the cell-2), and the voltage between v c3 pin and v ss pin (voltage of the cell-3) are supervised. if at least one of the cells? voltage becomes eq ual or more than the over-charge detector threshold, the over-charge is detected, and an external charge control nch mosfet turns on with c out pin being at "h" level and by cutting a fuse on the charger path, and charge stops. to reset the over-charge and make the c out pin level to "l" again after detecting over-charge, in such conditions that a time when all the cells? voltages are down to a level lower than over -charge released voltage. internal fixed output delay times for over-charge detect ion and release from over-charge exist. even if one of voltage of the cells keeps its level more than the over-c harge detector threshold, and output delay time passes, over-charge voltage is detected. after detecting over-charge, even if all t he cell voltages become equal or less than the released voltage from over-char ge, if at least one of the cells volt age becomes higher than the released voltage from over-charge within the output delay time of the release from over-charge, then over-charge is not released. the output type of the c out pin is cmos output between v ss and the built-in regulator, and "h" level of c out pin is the output voltage of the built-in regulator. (typ. 4.7v) ? shutdown function the voltage between v c1 pin and v c2 pin (the voltage of cell-1), the voltage between v c2 pin and v c3 pin (cell- 2 voltage), and the voltage between v c3 pin and v ss pin (cell-3 voltage) are supervised. if all the cells voltages become equal or less than the shutdown detector threshold, all the circuits are halted and shut down, as a result, the consumption current of ic itself (shutdown current) is extremely reduced. (max. 0.1 a) after detecting shutdown, at least one of the cell vo ltages becomes equal or more than the shutdown detector threshold, the shutdown state is released. ? ds (delay shortening) function by applying the voltage of 4v0.2v to vdd-vc1, over -charge delay time can be shortened to about 1/90 and released delay time can be shortened to about 1/60. ? 1-cell/ 2-cell/ 3-cell protection alternative when the ic should be used as a 1-ce ll protection ic, connect short v c1 pin ? v c2 pin and v c3 pin - v ss pin. when the ic should be used as a 2-ce ll protection ic, connect short v c1 pin ? v c2 pin or v c3 pin - v ss pin.
R5437/r5438l 12 timing chart over-charge operation v det11 v rel11 v cell1 t t v rel1 t v det1 t v det1 vr v ss cout t v rel1 t v det12 v rel12 v cell2 t v det13 v rel13 v cell3 t charge/discharge current charge current discharge current 0 t connect charger connect load
R5437/r5438l 13 typical applications (1) circuit example (3-cell protection) (2-1) circuit example (2-cell protection 1) *in terms of the order of c onnecting cells, the positive terminal of the cell 1 should be the last. otherwise, cout may output "h" tentatively, and the fuse may be fused. c1 c2 c3 r1 r2 r3 R5437/r5438 vc1 vc2 vc3 vss cell1 cell2 cell3 vdd cout normally l act h sc protector r vdd c vdd c1 c2 r1 r2 R5437/r5438 vc1 vc2 vc3 vss cell1 cell2 vdd cout normally l act h sc protector r vdd c vdd
R5437/r5438l 14 (2-2) circuit example (2-cell protection 2) (3) circuit example (1-cell protection) *in terms of the order of c onnecting cells, the positive terminal of the cell 1 should be the last. otherwise, cout may output "h" tentatively, and the fuse may be fused. c1 c2 r1 r2 R5437/r5438 vc1 vc2 vc3 vss cell1 cell2 vdd cout normally l act h sc protector r vdd c vdd c1 r1 R5437/r5438 vc1 vc2 vc3 vss cell1 vdd cout normally l act h sc protector r vdd c vdd
R5437/r5438l 15 external parts ratings symbol typ. unit range r vdd 100 100 1000 r1 1000 330 1000 r2 1000 330 1000 r3 1000 330 1000 c vdd 0.1 uf 0.01 1 c1 0.1 uf 0.01 1 c2 0.1 uf 0.01 1 c3 0.1 uf 0.01 1 technical notes the voltage fluctuatio n is stabilized with r vdd and c vdd . if a small r vdd is set, in the case of the large transient may happen to the cell voltage, by the flowing current, the ic may be unstable. if a large r vdd is set, by the consumption current of the ic itself, the voltage difference between v dd pin and v c1 pin is generated, and unexpected operation may result. therefor e, the appropriate value range of r vdd is from 100 to 1k . to make a stable operation of the ic, the appropriate value range of c vdd is from 0.01 f to 1.0 f. the voltage fluctuation is stabilized with r1 to r3 and c1 to c3. if a r1 to r3 is too large, by the conduction current at detection, the detector threshold may shift hi gher. therefore, the appropriate value range of r1 to r3 is equal or less than 1k . to make a stable operation of the ic, the appropriate value range of c1 to c3 is 0.01 f or more. the typical application circuit diagrams are just exam ples. this circuit performance largely depends on the pcb layout and external components. in the actual application, fully evaluation is necessary. over-voltage and the over current beyond the absolute maximum rating should not be forced to the protection ic and external components. during the time until the fuse is open after detecting over-charge, a large current may flow through the fet. select an fet with large enough current capacity in order to endure the large current. ricoh cannot assume responsibility for use of any circ uitry other than circuitry entirely embodied in a ricoh product. if technical notes are not complied with the circui t which is used ricoh product, ricoh is not responsible for any damages and any accidents. to connect the sc protector, connect the sc protector to the cell must be the last. *sc protector contact: dexerials corporation (sony chemical & information device company ltd.) zip code 141-0032 1-11-2 osaki, shinagawa, tokyo gate-city osaki east tower 8f phone 03-5435-3946 http://www.dexerials.jp
R5437/r5438l 16 typical characteristics ? part 1. vs. temperature 1)celln over-charge detector threshold vs. temperature 2)celln over-charge released voltage vs. temperature 3) over-charge output delay time vs. temperature r5438l301aa v cell n =3.9v(n=1,2,3) 4.42 4.43 4.44 4.45 4.46 4.47 4.48 -60 -40 -20 0 20 40 60 80 100 temperature() vdet1n(v ) r5438l301aa v cell n =3.9v(n=1,2,3) 4.05 4.1 4.15 4.2 4.25 -60 -40 -20 0 20 40 60 80 100 temperature() vrel1n(v) r5438l301aa vcelln=3.9v(n=2,3). v cell 1 =3.9v4.7v 0 0.5 1 1.5 2 2.5 3 3.5 4 -60 -40 -20 0 20 40 60 80 100 temperature() tvdet1(s) R5437l304ba vcelln=3.9v(n=2,3). v cell 1 =3.9v4.7v 0 1 2 3 4 5 6 7 8 -60 -40 -20 0 20 40 60 80 100 temperature() tvdet1(s) R5437l306ca vcelln=3.9v(n=2,3). v cell 1 =3.9v4.7v 0 2 4 6 8 10 12 -60 -40 -20 0 20 40 60 80 100 temperature() tvdet1(s)
R5437/r5438l 17 4) released delay time from over-charge vs. temperature 5) celln shutdown threshold vs. temperature 6) c out p-channel on voltage (no load)vs. temperature 7) c out p-channel on voltage vs. temperature r5438l301aa vcelln=3.9v(n=2,3). v cell 1 =4.7v3.9v 0 5 10 15 20 25 30 -60 -40 -20 0 20 40 60 80 100 temperature() tvrel1(s) r5438l301aa v cell n =3.1v(n=1,2,3) 2.8 3 3.2 3.4 3.6 3.8 4 4.2 -60 -40 -20 0 20 40 60 80 100 temperature() vsht1n(v) r5438l301aa v cell n =4.7v(n=1,2,3),i oh =0ua 4 4.2 4.4 4.6 4.8 5 5.2 5.4 -60 -40 -20 0 20 40 60 80 100 temperature() voh1(v) r5438l301aa v cell n =4.7v(n=1,2,3),i oh =-50ua -0.5 -0.4 -0.3 -0.2 -0.1 0 -60 -40 -20 0 20 40 60 80 100 temperature() voh2-voh1(v)
R5437/r5438l 18 8) c out n-channel on voltage vs. temperature 9) shutdown current vs. temperature 10) supply current vs. temperature r5438l301aa v cell n =3.9v(n=1,2,3),i oh =50ua 0 0.1 0.2 0.3 0.4 0.5 -60 -40 -20 0 20 40 60 80 100 temperature() vol(v) r5438l301aa v cell n =3.1v(n=1,2,3) 0 0.1 0.2 0.3 0.4 0.5 -60 -40 -20 0 20 40 60 80 100 temperature() isht(ua) r5438l301aa v cell n =3.9v(n=1,2,3) 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 -60 -40 -20 0 20 40 60 80 100 temperature() iss(ua)
R5437/r5438l 19 part2. supply current vs. v dd (R5437l306ca) 3-cell protection supply current vs. v dd R5437l306ca 0 1 2 3 4 5 6 7 8 9 10 0 5 10 15 20 vdd(v) supply current iss(ua) c1 0.1 ? 1k ? 1k ? R5437 v c1 cell1 cell2 cell3 v ss v dd c out normally l act h r1 r2 r3 100 ? r4 c4 0.1 a v c2 v c3
R5437/r5438l 20 part3. vs. external resister dependence (R5437l306ca) overcharge detector threshold/ over-charge released voltage vs. r1 R5437l306ca 4.42 4.43 4.44 4.45 4.46 4.47 4.48 0 500 1000 1500 2000 r1() vdet11(v) 3.93 3.94 3.95 3.96 3.97 3.98 3.99 vdet11 vrel11 c1 0.1 f c2 0.1 ? 1k ? R5437 v c1 v c2 v c3 cell1 cell2 cell3 v ss v dd c out normally l act h r1 r2 r3 100 ? r4 c4 0.1
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