ROHM BD6538G handbook
Contents
1. 4 OC O Open drain output 5 VOUT O Switch output Terminal circuit symbol Equivalent circuit ED Fig 38 Terminal circuit www rohm com 7 1 2011 05 RevB O 2011 ROHM Co Ltd All rights reserved BD6538G Technical Note G Operations Explanation 1 Overcurrent protection OCD The overcurrent detection circuit limits the current and outputs an error flag OC when the current flowing in switch MOSFET exceeds overcurrent threshold ru The timer is reset when the state of the overcurrent is terminated before passing of Tar Auk After a state of overcurrent is passed at blanking time the switch is shut down and 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 150 C typ Therefore when the junction temperature goes down to 150 C typ the switch output and an error flag OC are recovered automatically This operating is repeated until cause of junction temperature 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 a2. 50 100 PURPEN YOCTARE WANY AMBIENT TEMPERATURE Ta C Fig 18 Output rise time Fig 19 Output turn on time Fig 20 Output turn on time 5 0 6 0 Ta 25 C Vin 5 0V Ta 25 C 4 0 r7 S 3 i o i 5 3 0 a E u 20 C O J 41 20 1 0 Li 1 0 0 0 0 0 2 3 4 5 6 50 0 50 100 2 3 4 5 6 SUPPLY VOLTAGE Vin V AMBIENT TEMPERATURE Ta C SUPPLY VOLTAGE Vin V Fig 21 Output fall time Fig 22 Output fall time Fig 23 Output turn off time 6 0 20 20 Vin 5 0V Ta 25 C Vin 5 0V 5 0 T T T 540 2 Z m E 16 a 16 gt 3 0 w E E T 14 E 14 Z O 2 0 Z Z Z Z S 5 S42 m 12 1 0 en 0 0 10 10 50 0 50 100 2 3 4 5 6 50 0 50 100 AMBIENT TEMPERATURE Ta c SUPPLY VOLTAGE ViN V AMBIENT TEMPERATURE Ta C Fig 24 Output turn off time Fig 25 Blanking time Fig 26 Blanking time www rohm com 5 41 2011 05 Rev B O 2011 ROHM Co Ltd All rights reserved BD6538G Waveform data VEN n 5V div Vioc 5V div Vout 5V div lout E Vel eee ee qn m er TIME 1ms div Fig 27 Output rise characteristic Vioc 5V div du a M 5V div lour E ge rm Pi 0 5A div 00 07 TIME 20ms div Fig 30 Over current response Ramped load Vioc 5V div Vour v 5V div louT 0 5A div TIME 5ms div Fig 33 Over current response Output shortcircuit at Enable www rohm com 2011 ROHM Co Ltd All rights reserved VEN 5Vidi
3. 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 electromagnetic field can malfunction them 8 Inspection with set PCB On the inspection with the set PCB if a capacitor is connected to a low impedance IC terminal the IC can suffer stress Therefore be sure to discharge from the set PCB by each process Furthermore in order to mount or dismount the set PCB to from the jig for the inspection process be sure to turn 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 process and pay thorough attention to the transportation and the storage of the set PCB 9 Input terminals In terms of the construction of IC parasitic elements are inevitably formed in relation to potential The operation of the parasitic element can cause interference with circuit operation thus resulting in a malfunction and then breakdown of the input terminal Therefore pay thorough attention not to handle the input term
4. 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 Products 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
5. 1 ROHM Co Ltd All rights reserved BD6538G OG Electric characteristics Unless otherwise specified Vin 5 0V Ta 25 C DC characteristics Technical Note Limits y Parameter Symbol i unit Condition Min Typ Max Operating Current Ipp 110 160 HA Ven 5 0V Vout Open Standby Current IsrB 0 01 5 UA Ven OV Vout Open VEN 2 0 V High input EN input voltage PME VER 0 8 V Low input EN input current lEN 1 0 0 01 1 0 UA Ven 0Vor5V ON resistance Ron 150 200 mQ lour 50mA Over current threshold ITH 0 5 1 0 A Output current at short Isc 0 35 A Vout OV RMS OC output IOW voltage Vioc 0 4 V lioc 0 5mA UVLO Threshold VTUVH 2 1 2 3 2 5 V MAPANG VIN VTUVL 2 0 2 2 2 4 V Decreasing Vin AC characteristics Limits Parameter Symbol unit Condition Min Typ Max Output rise time ToN1 1 6 ms R_ 200 Fig 2 Ref Output rise delay time ToN2 1 5 10 ms R_ 200 Fig 2 Ref Output fall time Torr 1 20 US R 200 Fig 2 Ref Output fall delay time Torr2 3 40 US RL 200 Fig 2 Ref Blanking time TBLANK 10 15 20 ms www rohm com 2 41 2011 05 Rev B O 2011 ROHM Co Ltd All rights reserved BD6538G Technical Note Measurement circuit ON resistance Over current OC output LOW voltage Fig 1 Measurement circuit G Timing diagram Fig 2 Timing chart at outpu
6. ICONDUCTOR http www rohm com contact www rohm com 2011 ROHM Co Ltd All rights reserved R1120A
7. ROHM Technical Note SEMICONDUCTOR Power Management Switch ICs for PCs and Digital Consumer Products 1ch Small Package wut tee RoHS High Side Switch IC for USB Devices and Memory Cards BD6538G No 11029EBT14 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 are integrated into 1chip Feature Nr Single channel of low ON resistance Typ 150mQ Nch power MOSFET built in 500mA Continuous current load Active High Control Logic Soft start function Over current detection Output Off latch Operating Thermal shutdown Open drain error flag output Under voltage lockout Power supply voltage range 2 7V 5 5V Operating temperature range 40 C 85 C SSOP5 Package Se L G Absolute maximum ratings Rec 99 e v sre vm aa eco v ee We aa o Y mem fe 5 f bum von aa vero v mee To ene 6 Fere ro em 4 1 Mounted on 70mm 70mm 1 6mm grass epoxy PCB Derating 5 4mW C for operating above Ta 25 C This product is not designed for protection against radioactive rays G Operating conditions mE me I RIT IET eese Tom os pera ton o os www rohm com 1 11 2011 05 Rev B 201
8. ercurrent threshold Vioc mV Isre uA e T Technical Note 1 0 Ta 25 C 0 2 0 0 2 3 4 5 6 SUPPLY VOLTAGE Vin V Fig 5 Operating current EN Disable Low to High High to Lo 50 0 50 100 AMBIENT TEMPERATURE Ta C Fig 8 EN input voltage Ta 25 C 0 9 0 8 aA r 0 7 0 6 0 5 2 3 4 5 6 SUPPLY VOLTAGE VIV Fig 11 Over current detection 100 Vin 5 0V 50 0 50 100 AMBIENT TEMPERATURE Ta C Fig 14 OC output LOW voltage 2011 05 Rev B BD6538G Technical Note 2 5 1 0 5 0 gt S Ta 25 C 224 08 40 gt gt T A w E P23 0 6 S 3 0 S LU O22 o 0 4 20 1 VTUVL D k ul LLI I LU X E t 02 1 0 S O gt a I 20 E 0 0 0 0 0 50 100 50 0 50 100 2 3 4 5 AMBIENT TEMPERATURE Ta C AMBIENT TEMPERATURE Tare SUPPLY VOLTAGE ViN V Fig 15 UVLO Threshold Fig 16 UVLO hysteresis voltage Fig 17 Output rise time 5 0 5 0 5 0 Vin 5 0V Ta 25 C Vin 5 0V 4 0 40 4 0 T E E E 2 O O Z 3 0 30 F 3980 E ul LU z 7 H 2 0 E S 20 Z 2 0 u z Z s S T1 1 0 1 0 1 0 7 50 0 50 100 S b AMBIENT TEMPERATURE Tac 2 3 4 5 6 50 0
9. inals such as to apply to the input terminals a voltage lower than the GND respectively so that any parasitic element will operate Furthermore do not apply a voltage to the input terminals when no power supply voltage is applied to the IC In addition even if the power supply voltage is applied apply to the input terminals a voltage lower than the power supply voltage or within the guaranteed value of electrical 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 single ground at the reference point of the set PCB so that resistance to the wiring pattern and voltage fluctuations due to a large 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 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 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 p
10. rotection or guarantee of the LSI Therefore 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 of use www rohm com 10 11 2011 05 RevB O 2011 ROHM Co Ltd All rights reserved BD6538G Ordering part number Package G SSOP5 Technical Note Packaging and forming specification TR Embossed tape and reel SSOP5 Tape and Reel information 013 3 1 1 0 05 0 05 0 05 Unit mm www rohm com 2011 ROHM Co Ltd All rights reserved Embossed carrier tape 3000pcs TR Direction of feed 11 11 The direction is the 1pin of product is at the upper right when you hold reel on the left hand and you pull out the tape on the right hand Direction of feed Order quantity needs to be multiple of the minimum quantity 2011 05 Rev B Notice 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
11. 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 Thank you for your accessing to ROHM product informations More detail product informations and catalogs are available please contact us ROHM ROHM Customer Support System SEM
12. system connection diagram doesn t guarantee 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 static characteristics but also transient characteristics Q Power dissipation character SSOP5 package 700 600 gt 500 E UO A Z 400 O H amp D 300 u Q D 200 z O A 100 0 0 25 50 75 100 125 150 AMBIENT TEMPERATURE Ta c 70mm 70mm 1 6mm glass epoxy board mounting Fig 42 Power dissipation curve Pd Ta Curve www rohm com 9 11 2011 05 Rev B 2011 ROHM Co Ltd All rights reserved BD6538G Technical Note 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 breaking 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 characteristics 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 connec
13. t MOSFET until VIN exceeds 2 3V Typ If VIN drops 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 detection of overcurrent thermal shutdown output is Low level Over current shutdown operating T BLANK FLAG Output Fig 40 Overcurrent shutdown operation Reset at reclosing of power supply VIN www rohm com 8 11 2011 05 Rev B 2011 ROHM Co Ltd All rights reserved BD6538G Technical Note Typical application circuit Ferrite bead Controller Fig 41 Typical application circuit OG 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 capacitor by IN terminal and GND terminal of IC 1uF or higher is recommended Pull up OC output by resistance 10kO 100kQ Set up value which satisfies the application as CL and Ferrite Beads This system connection diagram doesn t guarantee 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 static characteristics but also transient characteristics This
14. t rise fall time www rohm com 341 2011 05 RevB O 2011 ROHM Co Ltd All rights reserved BD6538G Reference data OPERATING CURRENT ON RESISTANCE OPERATING CURRENT RonimQ Overcurrent threshold ITH A IstB UA gt A 140 120 Ta 25 C 3 4 5 SUPPLY VOLTAGE Vin V Fig 3 Operating current EN Enable N 50 0 50 100 AMBIENT TEMPERATURE Ta C Fig 6 Operating current EN Disable 200 Ta 25 C 100 50 0 2 3 4 5 6 SUPPLY VOLTAGE Vin V Fig 9 ON resistance Vin 5 0V a 50 0 50 100 AMBIENT TEMPERATURE Ta C Fig 12 Over current detection www rohm com 2011 ROHM Co Ltd All rights reserved OC OUTPUT LOW VOLTAGE ENABLE INPUT VOLTAGE ON RESISTANCE V OC mV OPERATING CURRENT Vin 5 0V 10 50 0 50 100 AMBIENT TEMPERATURE Tafec Fig 4 Operating current EN Enable Low to High High to Low 3 4 5 SUPPLY VOLTAGE Vin V Fig EN input voltage 200 Vin 5 0V 150 d 100 c 50 0 50 0 50 AMBIENT TEMPERATURE Tal C Fig 10 ON resistance 100 3 4 5 SUPPLY VOLTAGE ViN V Fig 13 OC output LOW voltage 4 11 100 Ta 25 C 80 60 40 20 0 2 OC OUTPUT LOW VOLTAGE OPERATING CURRENT ENABLE INPUT VOLTAGE ha A Ov
15. tor can break down ICs Take protective measures against the breakdown due to the reverse connection such as mounting 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 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 the 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 used 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 including an actual electric transient 6 Short circuit between terminals and erroneous mounting
16. v Vioc 5V div Vout 5Vidiv lout 0 5A div TIME 1us div Fig 28 Output fall characteristic Vioc 5Vidiv Vout 5Vidiv OUT 0 5A div l Vin 5V TIME 5ms div Fig 31 Over current response Ramped load VIN 5V div Vout 5V div louT 0 2A div TIME 10ms div Fig 34 UVLO response Vin Increasing 6 11 Technical Note VEN d E 5Vidiv oe 2 or oe oe N Vioc CIEN CUTE m Ci 100u E IOUT TE T vr X v r g eed Ren yEyE Vader edge T 0 2A div TJ 45 1 A m eA Tiger on i MINES yp Rezo TIME 2ms div Fig29 Inrush current respone VEN a 5V div Vioc 5V div Vout 5V div louT 0 5A div TIME 5ms div Fig 32 Over current response Enable to short circuit DAR Maine iM 05 VIN zl 5V div Vout 5V div louT 0 2A div TIME 10ms div Fig 35 UVLO response Vin Decreasing 2011 05 Rev B BD6538G Technical Note Block diagram OC VIN VOUT GND Top View DU OUT EN OC Fig 36 Block diagram Fig 37 Pin Configuration Pin description Pin No symbol I O Pin function 1 VIN I Power supply input Input terminal to switch and power supply input terminal of the internal circuit 2 GND Ground Enable input i EN Power switch on at High level Over current output Low level at over current detection
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