FUJITSU MICROELECTRONICS DATA SHEET DS04-27603-1Ea ASSP For Power Supply Applications Power Management Switch IC MB3841 DESCRIPTION The FUJITSU MICROELECTRONICS MB3841 is a one-channel power management switch IC with extremely low on resistance. The MB3841 is designed for a variety of switching applications, featuring operation from low input voltages (VIN > 2.2 V) and stable on resistance that does not depend on input voltage. The switch current limit can be externally set over a wide range from 100 mA to 2 A. A safety function detects overcurrent conditions, immediately sets the switch to off mode and sends an external notification signal. The MB3841 is therefore ideal for power management switching applications with USB specifications. In addition, the MB3841 has features that ensure accurate on-off switching by preventing reverse current in off mode, as well as rapid discharge of capacitors connected to output. FEATURES * * * * * * * * * * Low on resistance switch (typ. 45 m) Low input voltage operation (2.2 V to 5.5 V) Switch current (max. 2 A) UVLO (VTH = 1.9 V) External settings for soft start time and switch current limit On-chip overheating and overcurrent detection (output off latching) On-chip abnormal state detection circuit (O.C. pin) On-chip output pin discharge control circuit Supply current = 0 A in standby mode (CONTROL < 0.8 V) Reverse current protection function in off mode Copyright(c)1998-2008 FUJITSU MICROELECTRONICS LIMITED All rights reserved 1998.9 MB3841 PACKAGE 8-pin Plastic SOP (FPT-8P-M01) PIN ASSIGNMENT CONTROL O.C SS GND CURRENT VCC VIN OUT (TOP VIEW) 2 MB3841 PIN DESCRIPTION Pin no. Symbol 1 CONTROL 2 SS 3 CURRENT 4 VIN Descriptions Control signal input pin. Set "H" to turn the switch on, "L" to turn the switch off. At 0.8 V or less, the chip is in STBY state and current consumption is less than1A. Slow start setting pin. Used to adjust the switch on/off timing. Add external capacitance to delay operation. Leave open when not in use. In open mode voltages up to 10 V are present. Care should be taken in mounting to prevent leak current generation because high impedance is required. Current limit setting pin. The limit current level is set by connecting this pin to external resistance. If this pin is connected to GND, no current limit is applied. Switch input pin. The VIN voltage monitoring function enables switch operation at 1.9 V or higher. If the VIN voltage drops to 1.8 V or lower switch operation is disabled. 5 OUT Switch output pin. The discharge function will immediately discharge the capacitance charge connected to the OUT pin when the switch is in off position and 350 resistance (with VCC = 5 V) is connected to the GND terminal. 6 VCC Control power supply input pin. This pin supplies power to the control circuit. The input voltage level must be stable. 7 GND Ground pin. O.C External signal pin. When the switch is in on mode this pin normally outputs a "H" level signal, but changes to "L" level when an overcurrent, overheating, or UVLO condition is detected. When the switch is in off mode this signal is output at "L" level at all times. This is an open drain connection, and should be pulled up to high potential using resistance. 8 3 MB3841 BLOCK DIAGRAM VIN OUT SW CURRENT load current detection Charge pump SS + COMP - OSC Temperature (HYS) protection Q S + COMP FF - R VCC BGR + CONTROL COMP - (HYS) DISCHARGE O.C GND 4 MB3841 ABSOLUTE MAXIMUM RATINGS Parameter Symbol Condition Input voltage VIN Power supply voltage Rating Unit Max. Min. -- -0.3 7.0 V VCC -- -0.3 7.0 V Control voltage VCTL -- -0.3 7.0 V Switch current ISW VIN = 2.2 V to 5.5 V, Ta = +25C -- 3 A (DC) A Allowable dissipation PD Ta = +85C -- 280 mW Storage temperature TSTG -- -55 +125 C WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current, temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings. RECOMMENDED OPERATING CONDITIONS Parameter Symbol Condition Input voltage VIN Power supply voltage VCC Control voltage VCTL Switch current ISW SS pin capacitance CSS Current limit resistance RLIN O.C sync current IOC Operating temperature TOP Value Unit Min. Typ. Max. -- 0 -- 5.5 V -- 0 -- 5.5 V 0 -- 5.5 V VIN = 2.2 V to 5.5 V, VCTL = 2.2 V to 5.5 V -- -- 2.0 A -- -- -- 10 nF VIN = 5.0 V (ISW = 2 A to 0.1 A) 1.8 -- 24 k VIN = 2.2 V (ISW = 2 A to 0.1 A) 2.2 -- 51 k -- -- 1.0 mA -20 -- +85 C VCTL VCC VIN = 2.2 V to 5.5 V, VCC -- 2.2 V Note: For CSS, RLIN settings, see p. 9. WARNING: The recommended operating conditions are required in order to ensure the normal operation of the semiconductor device. All of the device's electrical characteristics are warranted when the device is operated within these ranges. Always use semiconductor devices within their recommended operating condition ranges. Operation outside these ranges may adversely affect reliability and could result in device failure. No warranty is made with respect to uses, operating conditions, or combinations not represented on the data sheet. Users considering application outside the listed conditions are advised to contact their representatives beforehand. 5 MB3841 ELECTRICAL CHARACTERISTICS (VIN = 5 V, VCC = 5 V, Ta = +25C) Parameter Switch resistance IN pin disable current VCC power supply current UVLO threshold UVLO histeresis spread CONTROL pin input current CONTROL pin threshold CONTROL pin histeresis spread Symbol Min. Typ. Max. Unit VIN = 5 V, VCTL = 3 V, ISW = 2 A -- 45 70 m IIN1 VIN = 5 V, VCTL = 3 V, ISW = 0 A -- 170 340 A IIN2 VIN = 5 V, VCTL = 3 V, ISW = 2 A -- 0.9 1.8 mA IIN3 VIN = 5 V, VCTL = 0.4 V -- -- 1.0 A ICC1 VIN = 5 V, VCTL = 3 V, ISW = 2 A -- 105 210 A ICC2 VIN = 5 V, VCTL = 0.4 V -- -- 1.0 A VIUH VCC = 5 V, VIN at O.C. = L H 1.7 1.9 2.1 V VIUL VCC = 5 V, VIN at O.C. = H L 1.6 1.8 2.0 V VIUHY VIUHY = VIUH - VIUL 50 100 150 mV VCTL = 5 V, ISW = 0 A -- 5.0 10 A VTHCTL VCC = 2.2 V, VCTL at O.C. = L H 1.2 1.35 1.5 V VTLCTL VCC = 2.2 V, VCTL at O.C. = H L 1.0 1.15 1.3 V VCTLHY VCTLHY = VTHCTL - VTLCTL 100 200 300 mV RLIM = 24 k, VCTL = 2.2 V 73 105 137 mA RLIM = 1.8 k, VCTL = 2.2 V 1.57 1.97 2.37 A RLIM = 51 k, VCTL = 2.2 V 68 98 128 mA RLIM = 2.2 k, VCTL = 2.2 V 1.53 1.92 2.31 A ICTL ISWLH1 ISWLL2 ISWLH2 VIN = 5 V VIN = 2.2 V O.C sync current IOCS VCC = 5 V, VCTL = 0.8 V, VOC = 0.4 V 1.0 -- -- mA O.C leak current IOCL VCC = 5 V, VCTL = 3 V, VOC = 5.0 V -- -- 2.0 A Switch discharge resistance RDCG VCC = 5 V, VCTL = 0.8 V, VOUT = 5.0 V -- 350 700 Temperature protection (Tj) TLIM VCC = 5 V, VCTL = 2.2 V +125 -- -- C tON1 VCC = 5 V, VIN = 5 V, SS, OUT: Open -- 300 900 s tON2 VCC = 5 V, VIN = 2.2 V, SS, OUT: Open -- 610 1830 s tOFF1 VIN = 5 V, VCC = 5 V, SS, OUT: Open -- 10 50 s tOFF2 VIN = 5 V, VCC = 2.2 V, SS, OUT: Open -- 50 250 s OUT pin rise time OUT pin fall time 6 Value RON ISWLL1 Switch current limit Condition MB3841 DIAGRAM 1. Normal operation VCC VIN CONTROL 1.35 V 1.15 V 90% VOUT 10% 90% tON 10% tOFF O.C DISCHARGE logic OFF ON ON 2. At VIN Fall VCC VIN 1.9 V 1.8 V CONTROL VOUT O.C DISCHARGE logic ON OFF 7 MB3841 3. At VOUT short VCC VIN CONTROL 1.15 V VOUT O.C Over current latch Latch set Latch release DISCHARGE logic ON 8 OFF ON MB3841 TYPICAL CHARACTERISTICS 1. RLIM vs. Limit Current Characteristics RLIM - lSW ISW(A) 10 VIN = 2.2 V VIN = 3.3 V VIN = 5 V 1 0.1 1000 10000 100000 RLIM () 2. CSS vs. TON (SS) Characteristics CSS - tON 100 tON (msec) 10 VIN = 2.2 V VIN = 3.3 V VIN = 5 V 1 0.1 100 1000 10000 CSS (pF) 9 MB3841 3. SW Resistance Temperature Characteristics Temperature dependency of SW resistance (VIN = 5 V, lOUT = 2 A, Ta: Ambient temperature) 100 90 80 SW resistance (m) 70 60 50 40 30 20 10 0 -60 -40 -20 0 20 40 60 80 100 120 Ta (C) VIN voltage dependency of SW resistance (lOUT = 2 A, Ta = -40, +25, +100C) 100 90 80 SW resistance (m) 70 60 -40C +25C 50 +100C 40 30 20 10 0 2 3 4 5 VIN (V) 10 6 7 MB3841 FUNCTIONAL DESCRIPTION Current Limit Setting The MB3841 provides highly accurate switching current setting, in the range 100 mA to 2 A 20% (with limit setting current at 2 A) by placing resistance between the CURRENT and GND pins. Because the setting is dependent on the VIN voltage, it is important that the appropriate resistance be connected to the VIN pin. The following approximation formula (1) may be used to calculate the limit setting when VIN = 5V. For details, see "RLIM vs. Limit Current Characteristics" on p. 9. ISW = 7450 (RLIM[])1.1 [A] .... (1) When the switch limit level is exceeded, the switch turns off and then latch is set to protect the device. At the same time the O.C output signal goes to "L" level to notify external systems. When a "L" level signal is applied to the CONTROL switch, the latch is released, so that normal operation is resumed at the next "H" level signal to the CONTROL switch. Thermal Shutdown The MB3841 has a thermal shutdown function which turns the switch off and sets the latch to protect the device when junction temperature exceeds 125C. At the same time the O.C output signal goes to "L" level to notify external systems. When a "L" level signal is applied to the CONTROL switch, the latch is released,so that normal operation is resumed at the next "H" level signal to the CONTROL switch. Slow Start The on/off switching time of the MB3841 can be delayed by applying capacitance between the SS and GND pins. Controlling the on time can soften surge current to the load side capacitance when power is turned on. (tON, tOff are measured at 90% of VOUT.) The following approximation formula (2) may be used to set on time when VIN = 5 V. For details, see "Css vs. tON (SS) Characteristics" on p. 9. tON = 0.87 x 10-3 x CSS[pF] + 0.3 [ms] .... (2) DISCHARGE The MB3841 has a DISCHARGE pin function that immediately discharges electric charge on the load side when the switch is turned off. 11 MB3841 TYPICAL APPLICATION Pull up resistance Control signal CONTROL O.C CSS SS GND RLIM CURRENT VIN 12 VCC OUT load MB3841 SAMPLE APPLICATIONS (1) Bus Supplied Hub (GANG Mode Connection) Bus Supply (Up-board) 5V USB controller MB3841 CONTROL O.C CSS SS GND Pull up resistance RLIM CURRENT VIN VCC Down-port OUT 100 mA max/port 13 MB3841 (2) Self Supplied Hub (NON-GANG Mode Connection) USB controller MB3841 CONTROL Pull up resistance O.C CSS SS Self supply RLIM GND CURRENT VCC Down-port 5V VIN OUT 500 mA max 3.3 V MB3841 CONTROL O.C CSS SS RLIM GND CURRENT Pull up resistance VCC Down-port VIN OUT 500 mA max MB3841 CONTROL O.C CSS SS RLIM GND CURRENT Pull up resistance VCC Down-port VIN OUT 500 mA max MB3841 CONTROL O.C Pull up resistance CSS SS RLIM CURRENT GND VCC Down-port VIN OUT 500 mA max 14 MB3841 USAGE PRECAUTION 1. Never use settings exceeding maximum rated conditions. Exceeding maximum rated conditions may cause permanent damage to the LSI. Also, it is recommended that recommended operating conditions be observed in normal use. Exceeding recommended operating conditions may adversely affect LSI reliability. 2. Use this device within recommended operating conditions. Recommended operating conditions are values within which normal LSI operation is warranted. Standard electrical characteristics are warranted within the range of recommended operating conditions and within the listed conditions for each parameter. 3. Printed circuit board ground lines should be set up with consideration for common impedance. 4. Take appropriate static electricity measures. * * * * Containers for semiconductor materials should have anti-static protection or be made of conductive material. After mounting, printed circuit boards should be stored and shipped in conductive bags or containers. Work platforms, tools, and instruments should be properly grounded. Working personnel should be grounded with resistance of 250 k to 1 m between body and ground. 5. Do not apply negative voltages. The use of negative voltages below -0.3 V may create parasitic transistors on LSI lines, which can cause abnormal operation. ORDERING INFORMATION Part number MB3841 PF-G-BND Package Remarks 8-pin Plastic SOP (FPT-8P-M01) 15 MB3841 PACKAGE DIMENSION 8-pin Plastic SOP (FPT-8P-M01) 2.25(.089)MAX +0.25 +.010 6.35 -0.20 .250 -.008 0.05(.002)MIN (STAND OFF) 5.300.30 (.209.012) INDEX 1.27(.050) TYP 0.450.10 (.018.004) 3.81(.150)REF +0.40 6.80 -0.20 +.016 .268 -.008 7.800.40 (.307.016) +0.05 O0.13(.005) M 0.15 -0.02 +.002 .006 -.001 0.500.20 (.020.008) Details of "A" part 0.20(.008) 0.50(.020) "A" 0.18(.007)MAX 0.10(.004) C 16 1994 FUJITSU LIMITED F08002S-4C-4 0.68(.027)MAX Dimensions in mm (inches) MB3841 MEMO 17 MB3841 MEMO 18 MB3841 MEMO 19 FUJITSU MICROELECTRONICS LIMITED Shinjuku Dai-Ichi Seimei Bldg. 7-1, Nishishinjuku 2-chome, Shinjuku-ku, Tokyo 163-0722, Japan Tel: +81-3-5322-3347 Fax: +81-3-5322-3387 http://jp.fujitsu.com/fml/en/ For further information please contact: North and South America FUJITSU MICROELECTRONICS AMERICA, INC. 1250 E. Arques Avenue, M/S 333 Sunnyvale, CA 94085-5401, U.S.A. Tel: +1-408-737-5600 Fax: +1-408-737-5999 http://www.fma.fujitsu.com/ Asia Pacific FUJITSU MICROELECTRONICS ASIA PTE LTD. 151 Lorong Chuan, #05-08 New Tech Park, Singapore 556741 Tel: +65-6281-0770 Fax: +65-6281-0220 http://www.fujitsu.com/sg/services/micro/semiconductor/ Europe FUJITSU MICROELECTRONICS EUROPE GmbH Pittlerstrasse 47, 63225 Langen, Germany Tel: +49-6103-690-0 Fax: +49-6103-690-122 http://emea.fujitsu.com/microelectronics/ FUJITSU MICROELECTRONICS SHANGHAI CO., LTD. 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