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FUJITSU SEMICONDUCTOR DATA SHEET
DS04-27603-1E
ASSP For Power Supply Applications
Power Management Switch IC
MB3841
s DESCRIPTION
The FUJITSU 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.
s 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
s PACKAGE
8-pin Plastic SOP
(FPT-8P-M01)
MB3841
s PIN ASSIGNMENT
CONTROL
O.C
SS
GND
CURRENT
VCC
VIN
OUT
(TOP VIEW)
2
MB3841
s PIN DESCRIPTION
Pin no. 1 Symbol CONTROL 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. 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. Control power supply input pin. This pin supplies power to the control circuit. The input voltage level must be stable. Ground pin. 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.
2
SS
3
CURRENT
4
VIN
5
OUT
6 7
VCC GND
8
O.C
3
MB3841
s BLOCK DIAGRAM
VIN
SW
OUT
Charge pump
load current detection
CURRENT
SS
+
COMP
-
Temperature protection
(HYS)
OSC
Q FF
S
+
COMP
-
R
VCC
BGR
+
CONTROL COMP
-
(HYS)
DISCHARGE
O.C GND
4
MB3841
s ABSOLUTE MAXIMUM RATINGS
Parameter Input voltage Power supply voltage Control voltage Switch current Allowable dissipation Storage temperature Symbol VIN VCC VCTL ISW PD TSTG Condition -- -- -- VIN = 2.2 V to 5.5 V, Ta = +25C Ta = +85C -- Rating Max. -0.3 -0.3 -0.3 -- -- -55 Min. 7.0 7.0 7.0 3 A (DC) 280 +125 Unit V V V A mW 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.
s RECOMMENDED OPERATING CONDITIONS
Parameter Input voltage Power supply voltage Control voltage Switch current SS pin capacitance Current limit resistance O.C sync current Operating temperature Symbol VIN VCC VCTL ISW CSS RLIN IOC TOP VCTL Condition -- -- VCC Value Min. 0 0 0 -- -- 1.8 2.2 -- -20 Typ. -- -- -- -- -- -- -- -- -- Max. 5.5 5.5 5.5 2.0 10 24 51 1.0 +85 Unit V V V A nF k k mA C
VIN = 2.2 V to 5.5 V, VCTL = 2.2 V to 5.5 V -- VIN = 5.0 V (ISW = 2 A to 0.1 A) VIN = 2.2 V (ISW = 2 A to 0.1 A) 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 FUJITSU representatives beforehand.
5
MB3841
s ELECTRICAL CHARACTERISTICS
(VIN = 5 V, VCC = 5 V, Ta = +25C) Parameter Switch resistance IN pin disable current Symbol RON IIN1 IIN2 IIN3 VCC power supply current UVLO threshold UVLO histeresis spread CONTROL pin input current CONTROL pin threshold CONTROL pin histeresis spread ICC1 ICC2 VIUH VIUL VIUHY ICTL VTHCTL VTLCTL VCTLHY ISWLL1 Switch current limit ISWLH1 ISWLL2 ISWLH2 O.C sync current O.C leak current Switch discharge resistance Temperature protection (Tj) OUT pin rise time OUT pin fall time IOCS IOCL RDCG TLIM tON1 tON2 tOFF1 tOFF2 Condition VIN = 5 V, VCTL = 3 V, ISW = 2 A VIN = 5 V, VCTL = 3 V, ISW = 0 A VIN = 5 V, VCTL = 3 V, ISW = 2 A VIN = 5 V, VCTL = 0.4 V VIN = 5 V, VCTL = 3 V, ISW = 2 A VIN = 5 V, VCTL = 0.4 V VCC = 5 V, VIN at O.C. = L H VCC = 5 V, VIN at O.C. = H L VIUHY = VIUH - VIUL VCTL = 5 V, ISW = 0 A VCC = 2.2 V, VCTL at O.C. = L H VCC = 2.2 V, VCTL at O.C. = H L VCTLHY = VTHCTL - VTLCTL VIN = 5 V VIN = 2.2 V RLIM = 24 k, VCTL = 2.2 V RLIM = 1.8 k, VCTL = 2.2 V RLIM = 51 k, VCTL = 2.2 V RLIM = 2.2 k, VCTL = 2.2 V Value Min. -- -- -- -- -- -- 1.7 1.6 50 -- 1.2 1.0 100 73 1.57 68 1.53 1.0 -- -- +125 -- -- -- -- Typ. 45 170 0.9 -- 105 -- 1.9 1.8 100 5.0 1.35 1.15 200 105 1.97 98 1.92 -- -- 350 -- 300 610 10 50 Max. 70 340 1.8 1.0 210 1.0 2.1 2.0 150 10 1.5 1.3 300 137 2.37 128 2.31 -- 2.0 700 -- 900 1830 50 250 Unit m A mA A A A V V mV A V V mV mA A mA A mA A C s s s s
VCC = 5 V, VCTL = 0.8 V, VOC = 0.4 V VCC = 5 V, VCTL = 3 V, VOC = 5.0 V VCC = 5 V, VCTL = 0.8 V, VOUT = 5.0 V VCC = 5 V, VCTL = 2.2 V VCC = 5 V, VIN = 5 V, SS, OUT: Open VCC = 5 V, VIN = 2.2 V, SS, OUT: Open VIN = 5 V, VCC = 5 V, SS, OUT: Open VIN = 5 V, VCC = 2.2 V, SS, OUT: Open
6
MB3841
s DIAGRAM
1. Normal operation
VCC
VIN
CONTROL
1.35 V 1.15 V
VOUT
90% 10% tON tOFF
90% 10%
O.C
DISCHARGE logic
ON
OFF
ON
2. At VIN Fall
VCC
VIN 1.8 V
1.9 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 DISCHARGE logic ON OFF ON Latch release
8
MB3841
s TYPICAL CHARACTERISTICS
1. RLIM vs. Limit Current Characteristics
RLIM - lSW 10
1
VIN = 2.2 V VIN = 3.3 V VIN = 5 V
ISW(A)
0.1 1000 10000 RLIM () 100000
2. CSS vs. TON (SS) Characteristics
CSS - tON 100
10 tON (msec)
VIN = 2.2 V VIN = 3.3 V VIN = 5 V 1
0.1 100 1000 CSS (pF) 10000
9
MB3841
3. SW Resistance Temperature Characteristics
Temperature dependency of SW resistance (VIN = 5 V, lOUT = 2 A, Ta: Ambient temperature) 100 90 80 70 SW resistance (m) 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 70 SW resistance (m) 60 50 40 30 20 10 0 2 3 4 VIN (V) 5 6 7 -40C +25C +100C
10
MB3841
s 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
s TYPICAL APPLICATION
Pull up resistance Control signal CONTROL O.C
CSS SS GND
RLIM CURRENT VCC
VIN
OUT
load
12
MB3841
s SAMPLE APPLICATIONS
(1) Bus Supplied Hub (GANG Mode Connection) Bus Supply (Up-board)
5V
USB controller
MB3841
CONTROL CSS SS RLIM CURRENT
O.C
GND
Pull up resistance
VCC
Down-port
VIN
OUT 100 mA max/port
13
MB3841
(2) Self Supplied Hub (NON-GANG Mode Connection)
USB controller
MB3841 CONTROL CSS SS Self supply 5V 3.3 V MB3841 CONTROL CSS SS RLIM CURRENT VIN GND VCC O.C RLIM CURRENT VIN GND VCC O.C
Pull up resistance
Down-port OUT 500 mA max
Pull up resistance
Down-port OUT 500 mA max
MB3841 CONTROL CSS SS RLIM CURRENT VIN GND VCC Down-port OUT 500 mA max O.C
Pull up resistance
MB3841 CONTROL CSS SS RLIM CURRENT VIN GND VCC Down-port OUT 500 mA max O.C Pull up resistance
14
MB3841
s 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.
s ORDERING INFORMATION
Part number MB3841 PF-G-BND Package 8-pin Plastic SOP (FPT-8P-M01) Remarks
15
MB3841
s PACKAGE DIMENSION
8-pin Plastic SOP (FPT-8P-M01)
2.25(.089)MAX 6.35 -0.20 .250 -.008
+0.25 +.010
0.05(.002)MIN (STAND OFF)
INDEX
5.300.30 (.209.012)
7.800.40 (.307.016)
6.80 -0.20 +.016 .268 -.008
+0.40
1.27(.050) TYP 3.81(.150)REF
0.450.10 (.018.004)
O0.13(.005)
M
0.15 -0.02 +.002 .006 -.001
+0.05
0.500.20 (.020.008)
Details of "A" part 0.20(.008)
0.50(.020) "A" 0.10(.004) 0.18(.007)MAX 0.68(.027)MAX
C
1994 FUJITSU LIMITED F08002S-4C-4
Dimensions in mm (inches)
16
MB3841
FUJITSU LIMITED
For further information please contact:
Japan FUJITSU LIMITED Corporate Global Business Support Division Electronic Devices KAWASAKI PLANT, 4-1-1, Kamikodanaka Nakahara-ku, Kawasaki-shi Kanagawa 211-8588, Japan Tel: 81(44) 754-3763 Fax: 81(44) 754-3329
All Rights Reserved. The contents of this document are subject to change without notice. Customers are advised to consult with FUJITSU sales representatives before ordering. The information and circuit diagrams in this document are presented as examples of semiconductor device applications, and are not intended to be incorporated in devices for actual use. Also, FUJITSU is unable to assume responsibility for infringement of any patent rights or other rights of third parties arising from the use of this information or circuit diagrams. FUJITSU semiconductor devices are intended for use in standard applications (computers, office automation and other office equipment, industrial, communications, and measurement equipment, personal or household devices, etc.). CAUTION: Customers considering the use of our products in special applications where failure or abnormal operation may directly affect human lives or cause physical injury or property damage, or where extremely high levels of reliability are demanded (such as aerospace systems, atomic energy controls, sea floor repeaters, vehicle operating controls, medical devices for life support, etc.) are requested to consult with FUJITSU sales representatives before such use. The company will not be responsible for damages arising from such use without prior approval. Any semiconductor devices have an inherent chance of failure. You must protect against injury, damage or loss from such failures by incorporating safety design measures into your facility and equipment such as redundancy, fire protection, and prevention of over-current levels and other abnormal operating conditions. If any products described in this document represent goods or technologies subject to certain restrictions on export under the Foreign Exchange and Foreign Trade Law of Japan, the prior authorization by Japanese government will be required for export of those products from Japan.
http://www.fujitsu.co.jp/
North and South America FUJITSU MICROELECTRONICS, INC. Semiconductor Division 3545 North First Street San Jose, CA 95134-1804, USA Tel: (408) 922-9000 Fax: (408) 922-9179 Customer Response Center Mon. - Fri.: 7 am - 5 pm (PST) Tel: (800) 866-8608 Fax: (408) 922-9179
http://www.fujitsumicro.com/
Europe FUJITSU MIKROELEKTRONIK GmbH Am Siebenstein 6-10 D-63303 Dreieich-Buchschlag Germany Tel: (06103) 690-0 Fax: (06103) 690-122
http://www.fujitsu-ede.com/
Asia Pacific FUJITSU MICROELECTRONICS ASIA PTE LTD #05-08, 151 Lorong Chuan New Tech Park Singapore 556741 Tel: (65) 281-0770 Fax: (65) 281-0220
http://www.fmap.com.sg/
F9809 (c) FUJITSU LIMITED Printed in Japan

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