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| 1/12 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. power management switch ics for pc s and digital consumer products 1ch high side switch ics for usb devices and memory cards BD2045AFJ, bd2055afj description single channel high side switch ic for usb port is a high side switch having over current prot ection used in power supply line of universal serial bus (usb). n-channel power mosfet of low on resistance and low supply current are realized in this ic. and, over current detection circuit, thermal shutdown circui t, under voltage lockout and soft start circuit are built in. features 1) low on resistance 80m ? nch mosfet switch. 2) continuous current load 0.25a 3) control input logic active-low : BD2045AFJ active-high : bd2055afj 4) soft start circuit 5) over current detection 6) thermal shutdown 7) under voltage lockout 8) open drain error flag output 9) reverse-current protection when power switch off 10) power supply voltage range 2.7v to 5.5v 11) ttl enable input 12) 1.2ms typical rise time 13) 10 a max standby current 14) operating temperat ure range -40c to 85c applications usb hub in consumer appliances, car accessory, pc, pc peripheral equipment, and so forth lineup parameter BD2045AFJ bd2055afj continuous current load (a) 0.25 0.25 output current at short (a) 0.5 0.5 control input logic low high absolute maxi mum ratings parameter symbol ratings unit supply voltage v in -0.3 to 6.0 v enable voltage v en , v /en -0.3 to 6.0 v /oc voltage v /oc -0.3 to 6.0 v /oc current is /oc 10 ma out voltage v out -0.3 to 6.0 v storage temperature t stg -55 to 150 c power dissipation pd 560 *1 mw *1 in the case of exceeding ta = 25c, 4.48mw should be reduced per 1c. * this chip is not designed to protect itself against radioactive rays. no.11029ect04
BD2045AFJ, bd2055afj technical note 2/12 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. operating conditions parameter symbol ratings unit operating voltage v in 2.7 to 5.5 v operating temperature t opr -40 to 85 c continuous output current i lo 0 to 250 ma electrical characteristics BD2045AFJ (unless otherwise specified, v in = 5.0v, ta = 25c) parameter symbol limits unit condition min. typ. max. operating current i dd - 90 120 a v /en = 0v, out = open standby current i stb - 0.01 1 a v /en = 5v, out = open /en input voltage v /en 2.0 - - v high input v /en - - 0.8 v low input - - 0.4 v low input 2.7v v in 4.5v /en input current i /en -1.0 0.01 1.0 a v /en = 0v or v /en = 5v /oc output low voltage v /oc - - 0.5 v i /oc = 5ma /oc output leak current il /oc - 0.01 1 a v /oc = 5v on resistance r on - 80 100 m ? i out = 250ma output current at short i sc 0.3 0.5 0.7 a v in = 5v, v out = 0v, c l = 100 f (rms) output rise time t on1 - 1.2 10 ms r l = 20 ? , c l = open output turn on time t on2 - 1.5 20 ms output fall time t off1 - 1 20 s output turn off time t off2 - 3 40 s uvlo threshold v tuvh 2.1 2.3 2.5 v increasing v in v tuvl 2.0 2.2 2.4 v decreasing v in bd2055afj (unless otherwise specified, v in = 5.0v, ta = 25c) parameter symbol limits unit condition min. typ. max. operating current i dd - 90 120 a v en = 5v, out = open standby current i stb - 0.01 1 a v en = 0v, out = open en input voltage v en 2.0 - - v high input v en - - 0.8 v low input - - 0.4 v low input 2.7v v in 4.5v en input current i en -1.0 0.01 1.0 a v en = 0v or v en = 5v /oc output low voltage v /oc - - 0.5 v i /oc = 5ma /oc output leak current il /oc - 0.01 1 a v /oc = 5v on resistance r on - 80 100 m ? i out = 250ma output current at short i sc 0.3 0.5 0.7 a v in = 5v, v out = 0v, c l = 100 f (rms) output rise time t on1 - 1.2 10 ms r l = 20 ? , c l = open output turn on time t on2 - 1.5 20 ms output fall time t off1 - 1 20 s output turn off time t off2 - 3 40 s uvlo threshold v tuvh 2.1 2.3 2.5 v increasing v in v tuvl 2.0 2.2 2.4 v decreasing v in BD2045AFJ, bd2055afj technical note 3/12 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. measurement circuit en(/en) out /oc in gnd v in in out out 1uf a v en (v /en ) en(/en) out / oc in gnd v in r l c l in out out 1uf v en (v /en ) operating current en, /en input voltage, output rise, fall time en(/en) out /oc in gnd v in c l in out out 1uf i out v in 10k v en (v /en ) en(/en) out /oc in gnd v in in out out 1uf i /o c v in v en (v /en ) on resistance, over current detection /oc output low voltage fig.1 measurement circuit timing diagram BD2045AFJ bd2055afj t on2 t on1 10% 90% 50% 50% 90% 10% t off2 t off1 v out v /en t on2 t on1 10% 90% 50% 50% 90% 10% t off2 t off1 v out v en fig.2 timing diagram fig.3 timing diagram BD2045AFJ, bd2055afj technical note 4/12 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. reference data 0 20 40 60 80 100 120 23456 supply voltage : v in [v] operating current : i dd [ a] ta =25 c fig.6 operating current en,/en disable fig.7 operating current en,/en disable fig.4 operating current en,/en enable 0 20 40 60 80 100 120 - 50 0 50 100 ambient temperature : ta[ ] operating current : i dd [ a] v in =5.0v 0.0 0.2 0.4 0.6 0.8 1.0 23 456 supply voltage : v in [v] operating current : i stb [ a] ta =25 c fig.5 operating current en,/en enable 0.0 0.5 1.0 1.5 2.0 23 456 supply voltage : v in [v] enable input voltage : v en, v /en [v] 0 low to hi g h high to low ta =25 c fig.8 en,/en input voltage 0.0 0.5 1.0 1.5 2.0 -50 0 50 100 ambient temperature : ta[ ] enable input voltage : v en , v /en [v] v in =5.0v high to lo w low to high fig.9 en,/en input voltage 0.0 0.1 0.2 0.3 0.4 0.5 23456 supply voltage : v in [v] /oc output low voltage : v /oc [v] ta =25 c fig.10 /oc output low voltage 0.0 0.1 0.2 0.3 0.4 0.5 -50 0 50 100 ambient temperature : ta[ ] /oc output low voltage : v /oc [v] v in =5.0v fig.11 /oc output low voltage fig.12 on resistance 0 50 100 150 200 - 50 0 50 100 ambient temperature : ta[ ] on resistance : r on [m ? ] v in =5.0v fig.13 on resistance 0.0 0.2 0.4 0.6 0.8 1.0 - 50 0 50 100 ambient temperature : ta[ ] operating current : i stb [ a] v in =5.0v 0 50 100 150 200 23 456 supply voltage : v in [v] on resistance : r on[ m ? ] ta =25 c 0.00 0.25 0.50 0.75 1.00 23 456 supply voltage : v in [v] short circuit current : i sc [a] ta =25 c fig.14 output current at shortcircuit 0.00 0.25 0.50 0.75 1.00 -50 0 50 100 ambient temperature : ta[ ] short circuit current : i sc [a] v in =5.0v fig.15 output current at shortcircuit BD2045AFJ, bd2055afj technical note 5/12 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. fig.19 output turn on time fig.22 output turn off time 0.0 1.0 2.0 3.0 4.0 5.0 - 50 0 50 100 ambient temperature : ta[ ] turn on time : t on2 [ms] v in =5.0v 0.0 1.0 2.0 3.0 4.0 5.0 23456 supply voltage : v in [v] turn off time : t off2 [ s] ta =25 c 0.0 1.0 2.0 3.0 4.0 5.0 - 50 0 50 100 ambient temperature : ta[ ] turn off time : t off2 [ s] v in =5.0v fig.23 output turn off time 2.0 2.1 2.2 2.3 2.4 2.5 -50 0 50 100 ambient temperature : ta[ ] uvlo threshold voltage : v uvloh , v uvlol [v] v uvloh v uvlol fig.24 uvlo threshold voltage 0.0 0.2 0.4 0.6 0.8 1.0 -50 0 50 100 ambient temperature : ta[ ] uvlo hysteresis voltage : v hys [v] fig.25 uvlo hysteresis voltage fig.16 output rise time 0.0 1.0 2.0 3.0 4.0 5.0 23456 supply voltage : v in [v] rise time : t on1 [ms] ta =25 c fig.18 output turn on time 0.0 1.0 2.0 3.0 4.0 5.0 23456 supply voltage : v in [v] turn on time : t on2 [ms] ta =25 c 0.0 1.0 2.0 3.0 4.0 5.0 - 50 0 50 100 ambient temperature : ta[ ] rise time : t on1 [ms] v in =5.0v fig.17 output rise time 0.0 1.0 2.0 3.0 4.0 5.0 23456 supply voltage : v in [v] fall time : t off1 [ s] ta =25 c fig.20 output fall time 0.0 1.0 2.0 3.0 4.0 5.0 -50 0 50 100 ambient temperature : ta[ ] fall time : t off1 [ s] v in =5.0v fig.21 output fall time BD2045AFJ, bd2055afj technical note 6/12 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. waveform data regarding the output rise/fall and over current detection charac teristics of bd2055afj, refer to the characteristic of bd2045af j. v in =5v time (2ms/div.) fig.30 over current response ramped load (BD2045AFJ) time (2ms/div.) fig.31 over current response enable to shortcircuit (BD2045AFJ) v /oc (5v/div.) v out (5v/div.) i out (0.5a/div.) v in =5v c l =100 f v /en (5v/div.) v /oc (5v/div.) v out (5v/div.) i out (0.5a/div.) v /en (5v/div.) v in =5v r l =20 c l =100 f v /oc (5v/div.) v out (5v/div.) i out (0.5a/div.) time(1ms/div.) fig.26 output rise characteristic (BD2045AFJ) v /en (5v/div.) v in =5v r l =20 c l =100 f v /oc (5v/div.) v out (5v/div.) i out (0.5a/div.) time(1ms/div.) fig.27 output fall characteristic (BD2045AFJ) (1v/div.) time (2ms/div.) fig.28. inrush current response (BD2045AFJ) v en i out (0.1a/div.) c l =47 f c l =100 f c l =147 f v in =5v r l =20 v /oc (1v/div.) time (20ms/div.) fig.29 over current response ramped load (BD2045AFJ) v /oc (5v/div.) v out (5v/div.) i out (0.5a/div.) v in =5v time (2ms/div.) fig.32 over current response enable to shortcircuit (BD2045AFJ) v /oc (5v/div.) v out (5v/div.) i out (0.5a/div.) v in =5v c l =100 f time (1s/div.) fig.33 over current response enable to shortcircuit (BD2045AFJ) v /oc (5v/div.) v out (5v/div.) i out (1.0a/div.) thermal shutdown v in =5v c l =100 f (5v/div.) time (10ms/div.) fig.34 uvlo response increasing v in (BD2045AFJ) v in (5v/div.) v out (5v/div.) i out (0.5a/div.) time (10ms/div.) fig.35 uvlo response decreasing v in (BD2045AFJ) (5v/div.) v in (5v/div.) v out (5v/div.) i out (0.5a/div.) v /oc c i =100 f r l =20 c i =100 f r l =20 v /oc BD2045AFJ, bd2055afj technical note 7/12 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. block diagram in in /oc en(/en) out out out gnd charge pump gate logic tsd ocd uvlo 1 2 3 4 8 7 6 5 gnd in in /oc out out out top view en(/en) fig.36 block diagram fig.37 pin configuration pin description BD2045AFJ pin no. symbol i / o pin function 1 gnd i ground. 2, 3 in i power supply input. input terminal to the power switch and power supply input terminal of the internal circuit. at use, connect each pin outside. 4 /en i enable input. power switch on at low level. high level input > 2.0v, low level input < 0.8v. 5 /oc o error flag output. low at over current, thermal shutdown. open drain output. 6, 7, 8 out o power switch output. at use, connect each pin outside. bd2055afj pin no. symbol i / o pin function 1 gnd i ground. 2, 3 in i power supply input. input terminal to the power switch and power s upply input terminal of the internal circuit. at use, connect each pin outside. 4 en i enable input. power switch on at high level. high level input > 2.0v, low level input < 0.8v 5 /oc o error flag output. low at over current, thermal shutdown. open drain output. 6, 7, 8 out o power switch output. at use, connect each pin outside. BD2045AFJ, bd2055afj technical note 8/12 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. i/o circuit symbol pin no equivalent circuit en(/en) 4 /oc 5 out 6,7,8 functional description 1. switch operation in terminal and out terminal are connected to the drain and the source of switch mosfet respectively. and the in terminal is used also as power source input to internal control circuit. when the switch is turned on from en/en control input, in terminal and out terminal are connected by a 80m ? switch. in on status, the switch is bidirectional. therefore, when the potential of out termi nal is higher than that of in terminal, current flows from out te rminal to in terminal. since a parasitic diode between the drain and the source of swit ch mosfet is canceled, in the off status, it is possible to prevent current from flowing reversely from out to in. 2. thermal shutdown circuit (tsd) if over current would continue, the temper ature of the ic would increase drastica lly. if the junction temperature were beyond 140c (typ.) in the condition of ov er current detection, thermal shutdown circuit operates and makes power switch turn off and outputs error flag (/oc). then, when the junction temperature decreases lower than 120c (typ.), power switch is turned on and error flag (/oc) is cancelled. unless the fact of the increasing chips temperat ure is removed or the output of power switch is turned off, this operation repeats. the thermal shutdown circuit operates when the switch is on (en,/en signal is active). 3. over current detection (ocd) the over current detection circuit limits current (i sc ) and outputs error flag (/oc) when current flowing in each switch mosfet exceeds a specified value. there are three types of response against ov er current. the over current detection circuit works when the switch is on (en,/en signal is active). 3-1. when the switch is turned on while the output is in shortcircuit status when the switch is turned on while the output is in shortcircuit status or so, the switch gets in current limit status soon. 3-2. when the output shortcircu its while the switch is on when the output shortcircuits or large capacity is connected while the switch is on, very large current flows until the over current limit circuit reacts. when the current detection , limit circuit works, current limitation is carried out. 3-3. when the output curre nt increases gradually when the output current increases graduall y, current limitation does not work unt il the output current exceeds the over current detection value. when it exceeds the detection value, current limitation is carried out. BD2045AFJ, bd2055afj technical note 9/12 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. 4. under voltage lockout (uvlo) uvlo circuit prevents the switch from turning on until the v in exceeds 2.3v(typ.). if the v in drops below 2.2v(typ.) while the switch turns on, then uvlo shuts off the powe r switch. uvlo has hysteresis of a 100mv(typ). under voltage lockout circuit works when the switch is on (en,/en signal is active). 5. error flag (/oc) output error flag output is n-mos open drain outpu t. at detection of over current, thermal shutdown, low level is output. over current detection has delay filter. this delay filter prev ents instantaneous current detection such as inrush current at switch on, hot plug from being informed to outside. v /en v out i out v /oc out p ut shortcircuit thermal shut down delay fig.38 over current detection, thermal shutdown timing (BD2045AFJ) v en v out i out v /oc out p ut shortcircuit thermal shut down delay fig.39 over current detection, thermal shutdown timing (bd2055afj) BD2045AFJ, bd2055afj technical note 10/12 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. 0 100 200 300 400 500 600 0 25 50 75 100 125 150 ambient temperature: ta [ ] power dissipation: pd[mw] typical application circuit in out regulator out out out in in / o c gnd vbus d- d+ gnd usb controlle r vbus d - d+ gnd 5v(typ.) 10k~ 100k ? c l c in - + en ( / en ) ferrite beads ferrite beads fig.40 typical application circuit application information when excessive current flows owing to output shortcircuit or so, ringing occurs by inductance of power source line to ic, and may cause bad influences upon ic actions. in order to avoid this case, connect a bypath ca pacitor by in terminal and gnd terminal of ic. 1 f or higher is recommended. pull up /oc output by resistance 10k ? to 100k ? . set up value which satisfies the application as c l and ferrite beads. this system connection diagram doesn?t guar antee operating as the application. the external circuit constant and so on is changed and it uses , in which there are adequate margins by taking into account external parts or dispersion of ic including not only stat ic characteristics but also transient characteristics. power dissipation character (sop-j8) fig.41 power dissipation curve (pd-ta curve) BD2045AFJ, bd2055afj technical note 11/12 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. notes for use (1) absolute ma ximum 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 the 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 the gnd terminal, the ics can break down. (7) operation in strong electromagnetic field be noted that using ics in the strong el ectromagnetic 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 ar e provided, it will be recommended to separate the large-current gnd pattern from the small-signal gnd pattern and establish a single ground at the re ference point of the set pcb so that resistance to the wiri ng pattern and voltage fluctuations due to a large current will caus e no fluctuations in voltages of the small-signal gnd. pay attention not to cause fluctuations in the gn d wiring pattern of external parts as well. (11) external capacitor in order to use a ceramic capacitor as the external capacitor, determine the constant with consideration given to a degradation in the nominal capacitance due to dc bias and changes in the capacitance due to temperature, etc. (12) thermal shutdown circuit (tsd) when junction temperatures become detecte d temperatures 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. t herefore, do not continuously 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. BD2045AFJ, bd2055afj technical note 12/12 www.rohm.com 2011.06 - rev.c ? 2011 rohm co., ltd. all rights reserved. ordering part number b d 2 0 4 5 a f j - e 2 part no. part no. 2045a 2055a package fj: sop-j8 packaging and forming specification e2: embossed tape and reel (sop-j8) ? order quantity needs to be multiple of the minimum quantity. 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 specied herein is subject to change for improvement without notice. the content specied 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 specications, 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 specied 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 specied 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 specied in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, ofce-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specied 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, re or any other damage caused in the event of the failure of any product, such as derating, redundancy, re 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 specied 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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