 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| 1/11 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 1ch small package high side switch ic for usb devices and memory cards BD6538G description BD6538G is single channel high side powers switch with low on resistance nch power mosfet. rich safety functions such as over current detection, thermal shutdown (tsd), under voltage lock out(uvlo) and soft start function which are required for the power supply port protection ar e integrated into 1chip. feature 1) single channel of low on resistance (typ = 150m ? ) nch power mosfet built in 2) 500ma continuous current load 3) active?high?control logic 4) soft start function 5) over current detection output off-latch operating 6) thermal shutdown 7) open drain error flag output 8) under voltage lockout 9) power supply voltage range 2.7v~5.5v 10) operating temperature range-40c~85c 11) ssop5 package absolute maximum ratings parameter symbol ratings unit supply voltage v in -0.3 to 6.0 v enable voltage v en -0.3 to 6.0 v /oc voltage v /oc -0.3 to 6.0 v /oc current i /oc 5 ma out voltage v out -0.3 to v in + 0.3 v storage temperature t stg -55 to 150 c power dissipation pd 675 *1 mw *1 1 mounted on 70mm * 70mm * 1.6mm grass-epoxy pcb. de rating : 5.4mw / c for operating above ta=25c. * this product is not designed for protection against radioactive rays. operating conditions parameter symbol ratings unit min typ max operating voltage v in 2.7 - 5.5 v operating temperature t opr -40 - 85 c continuous output current i out 0 - 0.5 a no.11029ebt14
BD6538G technical note 2/11 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. electric characteristics unless otherwise specified v in = 5.0v, ta = 25c dc characteristics parameter symbol limits unit condition min. typ. max. operating current i dd - 110 160 a v en = 5.0v, v out = open standby current i stb - 0.01 5 a v en = 0v, v out = open en input voltage v en 2.0 - - v high input v en - - 0.8 v low input en input current i en -1.0 0.01 1.0 a v en =0vor5v on resistance r on - 150 200 m ? i out = 50ma over current threshold i th 0.5 - 1.0 a - output current at short i sc 0.35 - - a v out = 0v (rms) /oc output low voltage v /oc - - 0.4 v i /oc = 0.5ma 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 ac characteristics parameter symbol limits unit condition min. typ. max. output rise time t on1 - 1 6 ms r l = 20 ? , fig. 2 ref. output rise delay time t on2 - 1.5 10 ms r l = 20 ? , fig. 2 ref. output fall time t off1 - 1 20 s r l = 20 ? , fig. 2 ref. output fall delay time t off2 - 3 40 s r l = 20 ? , fig. 2 ref. blanking time t blank 10 15 20 ms - BD6538G technical note 3/11 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. measurement circuit vin gnd en vout / oc v in v en a 1f vin gnd en vout /oc v in v en a 1f r l vin gnd en vout / oc v in v en a 1f i out 10k vin gnd en vout /oc v in v en a 1f i oc fig.1 measurement circuit timing diagram fig.2 timing chart at output rise / fall time t on2 t off2 t on1 t off1 v en v out 50% 50% 10% 90% 10% 90% on resistance, over current /oc output low voltage en input voltage, ou tput rise, fall time operating current BD6538G technical note 4/11 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. reference data fig.5 operating current en disable fig.6 operating current en disable fig.3 operating current en enable 0 20 40 60 80 100 120 140 -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 23456 supply voltage : v in [v] operating current : i stb [a] ta =25 c fig.4 operating current en enable 0.0 0.5 1.0 1.5 2.0 23456 supply voltage : v in [v] enable input voltage : v en [v] 0 low to high high to low ta =25 c fig.7 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] v in =5.0v high to lo w low to high fig.8 en input voltage 0 20 40 60 80 100 23456 s upp ly v oltage : v in [v] /oc output low voltage : v/oc[mv] fig.13 /oc output low voltage 0 20 40 60 80 100 -50 0 50 100 ambient temperature : ta[ ] /oc output low voltage : v /o c [m v] v in =5.0v fig.14 /oc output low voltage fig.9 on resistance 0 50 100 150 200 -50 0 50 100 ambient temperature : ta[ ] on resistance : r on [m ? ] v in =5.0v fig.10 on resistance 0 20 40 60 80 100 120 140 23456 supply voltage : v in [v] operating current : i dd [ a] ta =25 c 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 23456 supply voltage : v in [v] on resistance : r on[ m ? ] ta =25 c 0.5 0.6 0.7 0.8 0.9 1.0 23456 supply voltage : v in [v] overcurrent threshold : i th [a] ta =25 c fig.11 over current detection 0.5 0.6 0.7 0.8 0.9 1.0 -50 0 50 100 ambient temperature : ta[ ] overcurrent threshold : ith[a] v in =5.0v fig.12 over current detection ta =25 c BD6538G technical note 5/11 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. 10 12 14 16 18 20 -50 0 50 100 ambient temperature : ta[ ] blank time : t blank [ms] v in =5.0v 10 12 14 16 18 20 23456 supply voltage : v in [v] blanking time : t blank [ms] ta =25 c fig.19 output turn on time fig.20 output turn on time fig.23 output turn off 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[ ] 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] fall time : t off1 [ s] ta =25 c fig.21 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.22 output fall time 0.0 1.0 2.0 3.0 4.0 5.0 6.0 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 6.0 -50 0 50 100 ambient temperature : ta[ ] turn off time : t off2 [ s] v in =5.0v fig.24 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 : v tuvh , v tuvl [v] v tuvh v tuvl fig.15 uvlo threshold 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.16 uvlo hysteresis voltage fig.17 output rise time 0.0 1.0 2.0 3.0 4.0 5.0 -50 0 50 10 0 a mbi ent te mpe ra ture : ta[ ] rise time : t on1 [ms] v in =5.0v fig.18 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.25 blanking time fig.26 blanking time BD6538G technical note 6/11 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. waveform data v in =5v time (5ms/div.) fig.31 over current response ramped load v /oc (5v/div.) v out (5v/div.) i out (0.5a/div.) time (5ms/div.) fig.32 over current response enable to short circuit v in =5v 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 v /oc (5v/div.) v out (5v/div.) i out (0.5a/div.) time(1ms/div.) fig.27 output rise characteristic v en (5v/div.) v in =5v r l =20 v /oc (5v/div.) v out (5v/div.) i out (0.5a/div.) time(1us/div.) fig.28 output fall characteristic time (5ms/div.) fig.33 over current response output shortcircuit at enable v /oc (5v/div.) v out (5v/div.) i out (0.5a/div.) v in =5v time (2ms/div.) fig29. inrush current respone (5v/div.) v en i out (0.2a/div.) time (20ms/div.) fig.30 over current response ramped load v /oc (5v/div.) v out (5v/div.) i out (0.5a/div.) c l =47uf c l =100uf c l =147uf v in =5v r l =20 v in =5v v /oc (5v/div.) time (10ms/div.) fig.34 uvlo response v in increasing v in (5v/div.) v out (5v/div.) i out (0.2a/div.) time (10ms/div.) fig.35 uvlo response v in decreasing v in (5v/div.) v out (5v/div.) i out (0.2a/div.) r l =20 r l =20 BD6538G technical note 7/11 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. block diagram delay counter s r q tsd charge pump uvlo ocd gnd en vin /oc out vin gnd en 1 2 34 5 /oc vout top view fig.36 block diagram fig.37 pin configuration pin description pin no. symbol i/o pin function 1 vin - power supply input. input terminal to switch and power supply input terminal of the internal circuit. 2 gnd - ground. 3 en i enable input. power switch on at high level. 4 /oc o over current output. low level at over current detection. open drain output. 5 vout o switch output. terminal circuit symbol pin no. equivalent circuit en 3 en vout 5 vout /oc 4 /oc fig.38 terminal circuit BD6538G technical note 8/11 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. operations explanation 1.overcurrent protection ocd the overcurrent detection circuit limits the current and output s an error flag (/oc) when the current flowing in switch mosfet exceeds overcurrent threshold (i th ). the timer is reset when the state of the ov ercurrent is terminated before passing of t blank . after a state of overcurrent is passed at blanking time, the switch is shut down a nd the overcurrent signal (/oc) changes to low level. the latch is reset through it input low to en or detects uvlo. normal operation is returned by en signal is set to high or uvlo is off. (fig. 4, fig. 5). the over current limit circuit works when en signal is enable. 2. thermal shutdown circuit tsd thermal shutdown circuit turns off the switch and outputs an error flag (/oc) when the junction temperature exceeds 150c (typ.). therefore, when the juncti on temperature goes down to 150c (typ), the switch output and an error flag (/oc) are recovered automatically. this operati ng is repeated until cause of junction te mperature increase is removed or en signal is set disable. thermal shutdown circuit works when en signal is enable. 3. under voltage lockout uvlo uvlo keeps the switch-off state at mosf et until vin exceeds 2.3v (typ.). if vin dr ops under 2.2v (typ.) while the switch is turning on, then uvlo shuts off the power switch. under voltage lockout works when en signal is enable. 4. overcurrent signal output overcurrent signal output /oc is n-mos open drain output. at dete ction of overcurrent, thermal shutdown, output is low level. over current shutdown operating fig.39 overcurrent shutdown operation reset at toggle of en fig.40 overcurrent shutdown operation (res et at reclosing of power supply vin) t blank t blank on off on o u tp u t c u rre n t switch status ven flag o utpu t switch status vin t blank t blank on off on o u tp u t c u rre n t v tuvh v tuvl flag o utpu t ven BD6538G technical note 9/11 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. typical application circuit controller 10k~ 100k ? c l c in vin gnd en vou t /oc 5v(typ.) ferrite bead + - fig.41 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. 1uf or higher is recommended. pull up /oc output by resistance 10k ? ~ 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. 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 (ssop5 package) * 70mm * 70mm * 1.6mm : glass epoxy board mounting fig.42 power dissipation curve (pd-ta curve) :? :?:?:? :?:?:? :?:?:? :?:?:? :?:?:? :?:?:? :?:?:? :? :?:? :?:? :?:? :?:?:? :?:?:? :?:?:? ambient temperature: ta[ =? ] power dissipation: pd[mv] BD6538G technical note 10/11 www.rohm.com 2011.05 - rev.b ? 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 assumed, 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 characteristic s can be provided approximately as expected. the electrical characteristics are guaranteed under th e 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 the gnd lines. in this regard, for the digital block power supply and the analog block po wer 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 su pply 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 th e 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 pr ocess. 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 t he power supply and then dismount it from the jig. in addition, for protection against static electricity, establish a ground for the assembly process 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 resu lting in a malfunction 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 larg e current will cause no fluctuations 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 detected 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 guarant ee of the lsi. therefore, do not contin uously 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. BD6538G technical note 11/11 www.rohm.com 2011.05 - rev.b ? 2011 rohm co., ltd. all rights reserved. ordering part number b d 6 5 3 8 g - t r part no. part no. 6538 package g: ssop5 packaging and forming specification tr: embossed tape and reel (ssop5) direction of feed reel ? 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. |
Price & Availability of BD6538G
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |