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1/16 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. power management switch ics for pc s and digital consumer products load switch ics for potable equipment bd6520f,BD6522F description the power switch for expansion module is a power management switch having one circuit of n-channel power mos fet. the switch realizes 50m ? (typ.) on resistance. the switch turns on smoothly by the built-in charge pu mp, therefore, it is possible to reduce inrush current at switch on. and so ft start control by external capacitor is available. further, it has a discharge circuit that discharges electric ch arge from capacitive load at switch off, under voltage lockout circuit, and a thermal shutdown circuit. features 1) low on resistance (50m ? , typ.) n-mos switch built in 2) maximum output current: 2a 3) discharge circuit built in 4) soft start control circuit built in 5) under voltage lockout (uvlo) circuit built in 6) thermal shutdown (output off latching) 7) reverse current flow blocking at switch off (only BD6522F) applications notebook pc, pc peripheral device, etc. lineup parameter bd6520f BD6522F supply voltage 3 to 5.5v 3 to 5.5v switch current 2a 2a on resistance 50m? 50m ? out rise time 2000s 1000s out fall time 3s 4s package sop8 sop8 reverse current flow blocking at switch off - absolute maxi mum ratings parameter symbol ratings unit supply voltage v dd -0.3 to 6.0 v ctrl input voltage v ctrl -0.3 to 6.0 v switch output voltage v out -0.3 to v dd + 0.3 (bd6520f) v -0.3 to 6.0 (BD6522F) v storage temperature t stg -55 to 150 power dissipation pd 560 *1 mw *1 this value decreases 4.48mw/ above ta=25 * resistance radiation design is not doing. * operation is not guaranteed. operation conditions parameter symbol ratings unit supply voltage v dd 3.0 to 5.5 v switch current i out 0 to 2 a operating temperature t opr -25 to 85 no.11029ebt12
bd6520f,BD6522F technical note 2/16 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. electrical characteristics bd6520f(unless otherwise specified, ta = 25, v dd = 5v) parameter symbol limits unit condition min. typ. max. on resistance r on 1 - 50 70 m ? v dd = 5v, v ctrl = 5v r on 2 - 60 85 m ? v dd = 3v, v ctrl = 3v operating current i dd - 110 220 a v ctrl = 5v, out = open i ddst - - 2 a v ctrl = 0v, out = open control input voltage v ctrl l - - 0.7 v v ctrl l = low level v ctrl h 2.5 - - v v ctrl h = high level control input current i ctrl -1 0 1 a v ctrl = l, h turn on delay trd 200 1000 2000 us rl = 10 ? ,ssctl = open ctrl = l h out=50% turn on rise time tr 500 2000 7500 us rl = 10 ? ,ssctl = open ctrl = 10% 90% turn off delay tfd - 3 20 us rl = 10 ? ,ssctl = open ctrl = h l out=50% turn off fall time tf - 1 20 us rl = 10 ,ssctl = open ctrl = 90% 10% discharge resistance r swdc - 350 600 ? v dd = 5v, v ctrl = 0v, v out = 5v uvlo threshold voltage v uvlo h 2.3 2.5 2.7 v v dd increasing v uvlo l 2.1 2.3 2.5 v v dd decreasing uvlo hysteresis voltage v hys 100 200 300 mv v hys = v uvlo h - v uvlo l thermal shutdown threshold t ts - 135 - v ctrl = 5v ssctl output voltage v ssctl - 13.5 - v v ctrl = 5v BD6522F(unless otherwise specified, ta = 25, v dd = 5v) parameter symbol limits unit condition min. typ. max. on resistance r on 1 - 50 70 m ? v dd = 5v, v ctrl = 5v r on 2 - 60 85 m ? v dd = 3.3v, v ctrl = 3.3v operating current i dd - 110 220 a v ctrl = 5v, out = open i ddst - - 2 a v ctrl = 0v, out = open control input voltage v ctrl l - - 0.7 v v ctrl l = low level v ctrl h 2.5 - - v v ctrl h = high level control input current i ctrl -1 0 1 a v ctrl = l, h turn on time t on - 1000 3500 us rl = 10 ? ,ssctl = open ctrl = h out =90% turn off time t off - 4 20 us rl = 10 ? ,ssctl = open ctrl = l out = 10% discharge resistance r swdc - 350 600 ? v dd = 5v,v ctrl = 0v uvlo threshold voltage v uvlo h 2.3 2.5 2.7 v v dd increasing v uvlo l 2.1 2.3 2.5 v v dd decreasing uvlo hysteresis voltage v hys 100 200 300 mv v hys = v uvlo h - v uvlo l thermal shutdown threshold t ts - 135 - v ctrl = 5v ssctl output voltage v ssctl - 13.5 - v v ctrl = 5v
bd6520f,BD6522F technical note 3/16 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. measurement circuit fig.1 measurement circuit timing diagram fig.2 timing diagram v dd vddb vdda ssctl ctrl bd6520f vss outc outb outa rl cl i out v ctrl c ss vddb vdda ssctl ctrl BD6522F vss disc outb outa rl cl i out v ctrl c ss v dd bd6520f BD6522F v out v out v ctrl v ctrl v ctrl h v ctrl l v ctrl hv ctrl l t on t on t off t off t fd t rd t r t f 10% 50% 90% 10% 90% bd6520f BD6522F 10% 50% 90%
bd6520f,BD6522F technical note 4/16 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. 0 10 20 30 40 50 60 70 80 23456 supply voltage : v dd [v] on resistance : ron [m ? ] 0 10 20 30 40 50 60 70 80 -40-20 0 20406080100 ambitent temperature : ta [ ] on resista nce : ron [m ?] 0 20 40 60 80 100 120 23456 supply voltage : v dd [v] operating current : i dd [ua] 0 20 40 60 80 100 120 -40-20 0 20406080100 ambient temperature : ta [ ] operating current : i dd [ua] 0.0 0.5 1.0 1.5 2.0 2.5 23456 supply voltage : v dd [v] ctrl input voltage : v ctrl [v] 0.0 0.5 1.0 1.5 2.0 2.5 -40 -20 0 20 40 60 80 100 ambient temperature : ta [ ] ctrl input voltage : v ctrl [v] 0.0 0.5 1.0 1.5 2.0 2.5 -40-20 0 20406080100 ambient temperature : ta [ ] ctrl input voltage : v ctrl [v] 0 1 2 3 4 5 23456 supply voltage : v dd [v] turn on time :ton [ms] 0 0.1 0.2 0.3 0.4 23456 supply voltage : v dd [v] ctrl hysteresis : v ctrlhys [v] 0 0.1 0.2 0.3 0.4 -40 -20 0 20 40 60 80 100 ambient temperature : ta [ ] ctrl hysteresis : v ctrlhys [v] 0.00 0.02 0.04 0.06 0.08 0.10 23456 supply voltage : v dd [v] operating current : i ddst [ua] 0.0 0.2 0.4 0.6 0.8 1.0 0 20406080100 ambient temperature : ta [ ] leak current : i leak [ua] h typical characteristics g bd6520f fig.3 on resistance v dd =3.0v v dd =3.3v v dd =5.0v, 5.5v fig.4 on resistance fig.5 operating current (ctrl enable) fig.6 operating current (ctrl enable) low to high high to low fig.9 ctrl input voltage fig.10 ctrl input voltage h l fig.11 ctrl input voltage l h fig.14 turn on rise time trd tr ton fig.12 ctrl hysteresis voltage fig.13 ctrl hysteresis voltage fig.7 operating current (ctrl disenable) fig.8 leak current ta = 2 5 ` ta = 2 5 ` v dd = 5.0v ta = 25 ` v dd = 5.0v ta = 2 5 ` v dd = 5.0v v dd = 5.0v ta = 2 5 ` v dd = 5.0v ta = 25 `
bd6520f,BD6522F technical note 5/16 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. 0 1 2 3 4 5 -40-20 0 20406080100 ambient temperature : ta [ ] turn on time : ton [ms] 0 1 2 3 4 5 6 7 23456 supply voltage : v dd [v] turn off time : toff [us] 0 1 2 3 4 5 6 7 -40 -20 0 20 40 60 80 100 ambient temperature : ta [ ] turn off time : toff [us] 0 100 200 300 400 500 23456 supply voltage : v dd [v] discharge resistance : r swdc [? ] 0 100 200 300 400 500 -40 -20 0 20 40 60 80 100 ambient temperature : ta [ ] discharge resistance : r swdc [? ] 2.0 2.2 2.4 2.6 2.8 3.0 -40 -20 0 20 40 60 80 100 ambient temperature : ta [ ] uvlo threshold : v uvlo [v] 0 0.1 0.2 0.3 -40 -20 0 20 40 60 80 100 ambient temperature : ta [ ] uvlo hysteresis : v uvlohys [v] 1 10 100 1 10 100 1000 10000 css [pf] turn on time : ton [ms] 1 10 100 1 10 100 1000 10000 css [pf] turn off time : toff [us] 0 2 4 6 8 10 12 14 16 23456 supply voltage : v dd [v] ssctl voltage : v ssctl [v] 0 2 4 6 8 10 12 14 16 -40 -20 0 20 40 60 80 100 ambient temperature : ta [ ] ssctl voltage : v ssctl [v] trd tr ton tfd tf toff fig.15 turn on rise time fig.16 turn off fall time tfd tf toff fig.17 turn off fall time fig.18 switch discharge resistance fig.19 switch discharge resistance v dd decreasing v dd increasing fig.20 uvlo threshold voltage fig.21 uvlo hysteresis voltage fig.22 turn on rise ti me (vs. css) fig.23 turn off fall time (vs. css) fig.24 ssctl output voltage fig.25 ssctl output voltage v dd = 5.0v ta = 25 ` v dd = 5.0v ta = 2 5 ` v dd = 5.0v v dd = 5.0v v dd = 5.0v v dd = 5.0v, ta = 25 ` , rl = 10 v dd = 5.0v, ta = 25 ` , rl = 10 ta = 2 5 ` v dd = 5.0v
bd6520f,BD6522F technical note 6/16 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. 0 10 20 30 40 50 60 70 80 -40 -20 0 20 40 60 80 100 ambient temperature : ta [ ] on resistance : ron [m ? ] 0 10 20 30 40 50 60 70 80 23456 supply voltage : v dd [v] on resistance : ron [m ? ] 0 20 40 60 80 100 120 23456 supply current : v dd [v] operating current : i dd [ua] 0 20 40 60 80 100 120 -40-20 0 20406080100 ambient temperature : ta [ ] operating current : i dd [ua] 0.0 0.5 1.0 1.5 2.0 2.5 23456 supply voltage : v dd [v] ctrl input voltage : v ctrl [v] 0.0 0.5 1.0 1.5 2.0 2.5 -40 -20 0 20 40 60 80 100 ambient temperature : ta [ ] ctrl input voltage : v ctrl [v] 0 1 2 3 4 5 23456 supply voltage :v dd [v] turn on time : ton [ms] 0 1 2 3 4 5 -40 -20 0 20 40 60 80 100 ambient temperature : ta [ ] turn on time : ton [ms] 0 0.1 0.2 0.3 0.4 23456 supply voltage : v dd [v] ctrl hysteresis : v ctrlhys [v] 0.0 0.1 0.2 0.3 0.4 -40 -20 0 20 40 60 80 100 ambient temperature : ta [ ] ctrl hysteresis : v ctrlhys [v] 0.00 0.02 0.04 0.06 0.08 0.10 23456 supply voltage : v dd [v] operating current : i ddst [ua] 0.0 0.2 0.4 0.6 0.8 1.0 0 20406080100 ambient temperature : ta [ ] leak current : i leak [ua] g BD6522F fig.26 on resistance fig.27 on resistance vdd=5.0v vdd=3.3v fig.28 operating current (ctrl enable) fig.29 operating current (ctrl enable) low to high high to low fig.32 ctrl input voltage low to high high to low fig.33 ctrl input voltage fig.36 turn on time fig.37 turn on time fig.34 ctrl hysteresis voltage fig.35 ctrl hysteresis voltage fig.30 operating current (ctrl disenable) fig.31 leak current ta = 2 5 ` v dd = 5.0v ta = 2 5 ` ta = 2 5 ` v dd = 5.0v ta = 2 5 ` v dd = 5.0v ta = 25 ` v dd = 5.0v ta = 25 ` v dd = 5.0v
bd6520f,BD6522F technical note 7/16 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. 0 1 2 3 4 5 6 7 23456 supply voltage : v dd [v] turn off time : toff [us] 0 1 2 3 4 5 6 7 -40 -20 0 20 40 60 80 100 ambient temperature : ta [ ] turn off time : toff [us] 0 100 200 300 400 500 23456 supply voltage : v dd [v] discharge resistance : r swdc [?] 0 100 200 300 400 500 -40 -20 0 20 40 60 80 100 ambient temperature : ta [ ] discharge resistance : r swdc [ ? ] 2.0 2.2 2.4 2.6 2.8 3.0 -40 -20 0 20 40 60 80 100 ambient temperature : ta [ ] uvlo threshold : v uvlo [v] 0 0.1 0.2 0.3 -40 -20 0 20 40 60 80 100 ambient temperature : ta [ ] uvlo hysteresis : v uvlohys [v] 1 10 100 1 10 100 1000 10000 css [pf] turn on time : ton [ms] 1 10 100 1 10 100 1000 10000 css [pf] turn off time : toff [us] 0 2 4 6 8 10 12 14 16 23456 supply voltage : v dd [v] ssctl voltage : v ssctl [v] 0 2 4 6 8 10 12 14 16 -40 -20 0 20 40 60 80 100 ambient temperature : ta [ ] ssctl voltage : v ssctl [v] fig.38 turn off time fig.39 turn off time fig.40 switch discharge resistance fig.41 switch discharge resistance v dd decreasing v dd increasing fig.43 uvlo hysteresis voltage fig.44 turn on time (vs. css) fig.45 turn of f time (vs. css) fig.46 ssctl output voltage fig.47 ssctl output voltage ta = 2 5 ` v dd = 5.0v ta = 25 ` v dd = 5.0v ta = 25 ` v dd = 5.0v ta = 2 5 ` v dd = 5.0v, ta = 25 ` , rl = 10 ? v dd = 5.0v, ta = 25 ` , rl = 10 ? v dd = 5.0v fig.42 uvlo threshold voltage
bd6520f,BD6522F technical note 8/16 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. disc terminal not in use waveform data v dd = 5v, cl = 47f, rl = 47 , unless otherwise specified. v ctrl (5v/div.) v out (5v/div.) i out (0.5a/div.) open 470pf 2200pf open 1000pf 4700pf disc terminal in use thermal shut down temperature decline latch release return fig.48 turn on rise time (bd6520f) fig.49 turn off fall time (bd6520f) fig.50 turn on rise time (BD6522F) fig.51 turn off fall time (BD6522F) fig.52 inrush current vs. css (bd6520f) fig.53 inrush current vs. css (BD6522F) fig.54 discharge: cl = 47uf, rl = open (BD6522F) fig.55 thermal shutdown fig.56 uvlo (at vdd increase) fig.57 uvlo (at vdd decrease) v ctrl (5v/div.) v out (5v/div.) i out (0.5a/div.) v ctrl (5v/div.) v out (5v/div.) i out (0.5a/div.) v ctrl (5v/div.) v out (5v/div.) i out (0.5a/div.) v ctrl (5v/div.) i out (0.2a/div.) v ctrl (5v/div.) i out (0.5a/div.) v ctrl (5v/div.) v out (2v/div.) v ctrl (5v/div.) v out (2v/div.) v dd (2v/div.) v out (2v/div.) v dd (2v/div.) v out (2v/div.) time (1ms/div.) time (5ms/div.) time (1ms/div.) time (5ms/div.) time (2ms/div.) time (2ms/div.) time (20ms/div.) time (500ms/div.) time (500ms/div) time (500ms/div) cl=330uf cl=330uf
bd6520f,BD6522F technical note 9/16 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. block diagram, pin configuration, pin description (bd6520f) fig.58 block diagram(bd6520f) pin no. symbol pin function 1,2 vdda, vddb switch input pin at use, connect each pin outside. 3 ssctl soft start setting pin add external capacitor, it is possi ble to delay switch on, off time. 4 ctrl control input pin switch on at high level, switch off at low level. 5 vss ground 6,7,8 outa, outb, outc switch output pin at use, connect each pin outside. vdda vddb ssctl ctrl outa outb outc vss 1 2 3 4 5 6 7 8 1 charge pump oscillator 5 band gap thermal shutdown s q ff r 3 4 7 2 8 vss uvlo vddb ctrl ssctl vdda outa 6 outb outc
bd6520f,BD6522F technical note 10/16 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. (BD6522F) fig.59 block diagram(BD6522F) pin no. symbol pin function 1,2 vdda, vddb switch input pin at use, connect each pin outside. 3 ssctl soft start setting pin add external capacitor, it is possi ble to delay switch on, off time. 4 ctrl control input pin switch on at high level, switch off at low level. 5 vss ground 6 disc discharge pin 7,8 outa, outb switch output pin at use, connect each pin outside. 1 charge pump oscillator 5 band gap thermal shutdown s q ff r 3 4 7 2 8 vss uvlo vddb ctrl ssctl vdda 6 disc outb outa vdda vddb ssctl ctrl outa outb disc vss 1 2 3 4 5 6 7 8
bd6520f,BD6522F technical note 11/16 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. i/o circuit symbol pin no. equivalent circuit bd6520f equivalent circuit BD6522F ssctl 3 ssctl ctrl 4 ctrl ctrl disc 6 (BD6522F) disc out 6 (bd6520f), 7, 8 out out fig.60 i/o circuit ssctl
bd6520f,BD6522F technical note 12/16 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. functional description 1. switch operation vdd pin and out pin are connected to the drain and the sour ce of switch mosfet respectively. and the vdd is used also as power source input to internal control circuit. when ctrl input is set to high level and the switch is turned on, vdd and out is connected by a 50m ? switch. in a normal condition, current flows from vdd to out. if voltage of out is higher than vdd, current flows from out to vdd, since the switch is bidirectional. in bd6520f, there is a parasitic diode between the drain and the source of switch mosfet . therefore, even when the switch is off, if the voltage of out is hi gher than that of vdd, current flows from out to vdd. in BD6522F, there is not this parasitic diode, it is possible to prevent curre nt from flowing reversely from out to vdd. 2. thermal shutdown thermal shut down circuit turns off the swit ch when the junction temperature exceeds 135 (typ.). the switch off status of the thermal shut down is latched. therefore, even wh en the junction temperature goes down, switch off is maintained. to release the latch, it is necessary to input a signal to switch off to ctrl terminal or make uvlo status. when the switch on signal is input or uvlo is released, the switch output is recovered. the thermal shut down circuit works when ctrl signal is active. 3. low voltage malfunction prevention circuit (uvlo) the uvlo circuit monitors the voltage of the vdd pin, when the ctrl input is ac tive. uvlo circuit prevents the switch from turning on until the v dd exceeds 2.5v(typ.). if the v dd drops below 2.3v(typ.) while the switch turns on, then uvlo shuts off the switch. 4. soft start control in bd6520f/BD6522F, soft start is carried out in order to reduce inrush current at switch on. further, in order to reduce inrush current, soft start control pin (ssctl) is prepared. by connecting external capacitor to between ssctl and gnd, it is possible to make smoother the switch rise time. when the switch is enabled, ssctl outputs voltage of about 13.5v. ssctl terminal requires high impedance, so pay attention in packaging it so that there should not be leak current. and when voltage is impressed from the outside to ssctl terminal, switch on, off cannot be made correctly. 5. discharge circuit when the switch between the vdd and the out is off, the 200 ? (typ.) discharge switch between out and gnd turns on. by turning on this switch, electric charge at capacitive load is discharged. in BD6522F, the input of discharge circuit is separately prepar ed as disc pin. when to use the discharge circuit, connect out pin and disc pin outside.
bd6520f,BD6522F technical note 13/16 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. timing diagram fig.61 normal operation fig.62 uvlo operation fig.63 thermal shutdown operation v dd v ctrl v out discharge circuit on off on v dd v ctrl v out on off v uvlol v uvloh discharge circuit release over temperature occurs v dd v ctrl v out latch discharge circuit set set release release release off off off on over temperature corrected over temperature occurs over temperature corrected
bd6520f,BD6522F technical note 14/16 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. typical application circuits fig.64 power supply switch circuit (bd6520f) fig.65 power supply switch circuit (BD6522F) fig.66 2 power supply changeover switch circuit (BD6522F) thermal derating characteristic (sop8) fig. 67 power dissipation curve vdda vddb ssctl ctrl outa outb outc vss load bd6520f css on/off power supply vdda vddb ssctl ctrl outa outb disc vss BD6522F power supply load css on/off power supply a BD6522F css on/off vdda vddb ssctl ctrl outa outb disc vss load power supply b BD6522F css on/off vdda vddb ssctl ctrl outa outb disc vss 0 100 200 300 400 500 600 0 255075100125150 ambient temperature: ta [ ] power dissipation: pd[mw] 1f 1f
bd6520f,BD6522F technical note 15/16 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. notes for use (1) absolute maximum ratings an excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc., can break down devices, thus making impossible to identify break ing mode such as a short circuit or an open circuit. if any special mode exceeding the absolute maximum ratings is assu med, consideration should be given to take physical safety measures including the use of fuses, etc. (2) operating conditions these conditions represent a range within which characte ristics can be provided approximately as expected. the electrical characteristics are guaranteed under the conditions of each parameter. (3) reverse connection of power supply connector the reverse connection of power supply connector can break down ics. take protective measures against the breakdown due to the reverse connection, such as mount ing an external diode between the power supply and the ic?s power supply terminal. (4) power supply line design pcb pattern to provide low impedance for the wiring between the power supply and t he gnd lines. in this regard, for the digital block power supply and the analog block power supply, even though these power supplies has the same level of potential, separate the power supply pattern for the digital block from that for t he analog block, thus suppressing the diffraction of digital noises to the analog block power supply resulting from impedance common to the wiring patterns. for the gnd line, give consideration to design the patterns in a similar manner. furthermore, for all power supply terminals to ics, mount a capacitor between the power supply and the gnd terminal. at the same time, in order to use an electrolytic capacitor, thoroughly check to be sure the characteristics of the capacitor to be us ed present no problem including the occurrence of capacity dropout at a low temperature, thus determining the constant. (5) gnd voltage make setting of the potential of the gnd terminal so that it will be maintained at the minimum in any operating state. furthermore, check to be sure no terminals are at a potential lower than the gnd voltage includi ng an actual electric transient . (6) short circuit between terminals and erroneous mounting in order to mount ics on a set pcb, pay thorough attention to the direction and offset of t he ics. erroneous mounting can break down the ics. furthermore, if a short circuit occurs due to foreign matters entering between terminals or between the terminal and the power supply or t he gnd terminal, the ics can break down. (7) operation in strong electromagnetic field be noted that using ics in the strong elec tromagnetic field can malfunction them. (8) inspection with set pcb on the inspection with the set pcb, if a capacitor is connec ted to a low-impedance ic terminal, the ic can suffer stress. therefore, be sure to discharge from the set pcb by each proc ess. furthermore, in order to mount or dismount the set pcb to/from the jig for the inspection process, be sure to tu rn off the power supply and then mount the set pcb to the jig. after the completion of the inspection, be sure to turn off the power supply and then dismount it from the jig. in addition, for protection against static electricity, establish a ground for the assembly pr ocess and pay thorough attention to the transportation and the stor age of the set pcb. (9) input terminals in terms of the construction of ic, parasitic elements are inev itably formed in relation to potential. the operation of the par asitic element can cause interference with circuit operation, thus resulting in a malfuncti on and then breakdown of the input terminal . therefore, pay thorough attention not to handle the input terminals, such as to apply to the input terminals a voltage lower th an the gnd respectively, so that any parasitic element will operat e. furthermore, do not apply a voltage to the input terminals wh en no power supply voltage is applied to the ic. in addition, even if the power supply voltage is applied, apply to the input term inals a voltage lower than the power supply voltage or within the guaranteed value of elec trical characteristics. (10) ground wiring pattern if small-signal gnd and large-current gnd are provided, it will be recommended to separate the large-current gnd pattern from the small-signal gnd pattern and establish a si ngle ground at the reference poi nt of the set pcb so that resistance to the wiring pattern and voltage fluctuations due to a large current will cause no fluc tuations in voltages of the small-signal gnd. pay attention not to cause fluctuations in the gnd wiring pattern of external parts as well. (11) external capacitor in order to use a ceramic capacitor as the external capaci tor, determine the constant with consideration given to a degradation in the nominal capacitance due to dc bias and c hanges in the capacitance due to temperature, etc. (12) thermal shutdown circuit (tsd) when junction temperatures become 135c (typ .) or higher, the thermal shutdown circuit operates and turns a switch off. the thermal shutdown circuit, which is aimed at isolating the lsi from thermal runaway as much as possible, is not aimed at the protection or guarantee of the lsi. therefore, do not c ontinuously use the lsi with this circuit operating or use the lsi assuming its operation. (13) thermal design perform thermal design in which there are adequate margins by taking into account the power dissipation (pd) in actual states o f use.
bd6520f,BD6522F technical note 16/16 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. ordering part number b d 6 5 2 0 f - e 2 part no. part no. 6520 6522 package f: sop8 packaging and forming specification e2: embossed tape and reel (sop8) ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape tape quantity direction of feed the direction is the 1pin of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand 2500pcs e2 () direction of feed reel 1pin (unit : mm) sop8 0.90.15 0.3min 4 + 6 ? 4 0.17 +0.1 - 0.05 0.595 6 43 8 2 5 1 7 5.00.2 6.20.3 4.40.2 (max 5.35 include burr) 1.27 0.11 0.420.1 1.50.1 s 0.1 s
r1120 a www.rohm.com ? 2011 rohm co., ltd. all rights reserved. notice rohm customer support system http://www.rohm.com/contact/ thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact us. notes no copying or reproduction of this document, in part or in whole, is permitted without the consent of rohm co.,ltd. the content specified herein is subject to change for improvement without notice. the content specified herein is for the purpose of introducing rohm's products (hereinafter "products"). if you wish to use any such product, please be sure to refer to the specifications, which can be obtained from rohm upon request. examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the products. the peripheral conditions must be taken into account when designing circuits for mass production. great care was taken in ensuring the accuracy of the information specified in this document. however, should you incur any damage arising from any inaccuracy or misprint of such information, rohm shall bear no responsibility for such damage. the technical information specified herein is intended only to show the typical functions of and examples of application circuits for the produc ts. rohm does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by rohm and other parties. rohm shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. the products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specified in this document are not designed to be radiation tolerant. while rohm always makes efforts to enhance the quality and reliability of its products, a product may fail or malfunction for a variety of reasons. please be sure to implement in your equipment using the products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any product, such as derating, redundancy, fire control and fail-safe designs. rohm shall bear no responsibility whatsoever for your use of any product outside of the prescribed scope or not in accordance with the instruction manual. the products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel- controller or other safety device). rohm shall bear no responsibility in any way for use of any of the products for the above special purposes. if a product is intended to be used for any such special purpose, please contact a rohm sales representative before purchasing. if you intend to export or ship overseas any product or technology specified herein that may be controlled under the foreign exchange and the foreign trade law, you will be required to obtain a license or permit under the law.

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