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FUJITSU SEMICONDUCTOR DATA SHEET
DS04-27604-2E
ASSP For Power Supply Applications
Power Management 2-ch Switch IC
MB3842/MB3845
s DESCRIPTION
The MB3842/3845 is a power management switch with built-in 2-channel low-on resistance (typ. 100m) switch. Output control is by means of a control signal, and the MB3842 is designed for high-active operation (output on when EN is Hi), while the MB3845 is designed for low-active operation (output on when EN is low.) To provide adaptability to a variety of operations, the MB3842/3845 features low input voltage (VIN > 2.5V) operation and stable low-on resistance independent of input voltage. The switching current limit can be set from 100mA to 600mA by using external resistance, and when overcurrent conditions are detected the OC output goes low to provide an external notification signal. VIN is divided between the two channels, which operate independently of each other. In addition, an off-state reverse current prevention function is provided to ensure accurate on/off switching action.
s FEATURES
* * * * * * * * * * Low on resistance switch (typ. 100m) Low input voltage operation (2.5 V to 5.5 V) Switch current (max. 0.6 A) UVLO :VIN threshold 2.3V/2.1 V hysteresis 200 mV ENABLE :EN threshold EN 1.4V/1.6 V for MB3842, EN 1/2 VIN for MB3845 :Power supply current at output off = 0A EN < 0.8V for MB3842, EN = VIN for MB3845 External setting for soft start time and switch current limit. Over-temperature detection (switch latched off), over-current detection (not latched) OC pin flag set following overcurrent detection, over-temperature detection, or UVLO detection. Reverse current prevention at OFF (VIN 1.5 V) Either channel may be operated alone.
s PACKAGE
20-pin plastic SSOP
(FPT-20P-M03)
MB3842/MB3845
s PIN ASSIGNMENT
EN1, EN1
1
20
GND
SS1
2
19
OC1
CS1
3
18
OUT1
VIN1
4 SSOP-20P (FPT-20P-M03)
17
OUT1
VIN1
5
16
OUT1
VIN2
6
15
OUT2
VIN2
7
14
OUT2
CS2
8
13
OUT2
SS2
9
12
OC2
EN2, EN2
10
11
GND
EN CS
Enable Current Set
EN OC
Enable Over Current
SS
Slow Start
The functions of pin 1 and pin 10 differ on the MB3842 and MB3845. EN for MB3842/EN for MB3845
2
MB3842/MB3845
s PIN DESCRIPTION
Pin no. Symbol EN (MB3842) 1/10 EN (MB3845) Descriptions Control signal input pin. Set "H" to turn switch on, "L" to turn toff. At 0.8 V or less, the chip is in STBY state and current consumption is less than 1A. "L" level is 1.4V (typ), "H" level is 1.6V (typ), with 200mV (typ) hysteresis. Control signal input pin. Set "L" to turn switch on, "H" to turn off. At "H" level = VIN, the chip is in STBY state and current consumption is less than 1A. Normally used as CMOS inverter input, so that recommended use is "L" level at GND +0.5V or less, and "H" level is VIN -0.5V or greater. 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 12 V are present. Care should be taken in mounting to prevent leakage current generation because high impedance is required. Current limit setting pin. The limit current level is set by connecting this pin to external resistance. Switch output pin. An UVLO (VIN power monitor function) is provided so that when VIN reaches 2.3V (typ.) or higher the OC pin voltage goes to "H" level. Also if the VIN voltage drops to 2.1 V (typ.) or lower the OC output goes to "L" state. 200mV (typ) hysteresis is provided. Ground pin. External notification pin. When the switch is in on mode this pin normally outputs a "H" level signal, but changes to "L" level when an overcurrent, overtemperature, or UVLO condition is detected. This is an open drain connection, and should be pulled up to high potential using resistance. Switching output pin.(N-ch MOSFET source)
2/9
SS
3/8
CS
4/5/6/7
VIN
11/20
GND
12/19
OC
13/14/15 16/17/18
OUT
3
MB3842/MB3845
s BLOCK DIAGRAM (for 1 channel)
MB3842 OUT1
Charge pump1
Over current detection 1
CS1
SS1
Q FF1
S R
+ COMP -
EN1
OSC1
+ COMP -
OC1
VIN1 BGR1
Temperature protection 1
MB3845 OUT1
Charge pump1
Over current detection 1
CS1
SS1
Q FF1
S R
+ COMP -
EN1
OSC1
+ COMP -
OC1
VIN1 BGR1
Temperature protection 1
4
MB3842/MB3845
s ABSOLUTE MAXIMUM RATINGS
Parameter Input voltage ENABLE voltage Switch current Power dissipation Storage temperature Symbol VIN VEN ISW PD TSTG Ta = +85C -- Condition -- -- -- Rating Max. -0.3 -0.3 -- -- -55 Min. 7.0 7.0 1.8 216 +125 Unit 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 ENABLE voltage Switch current SS pin capacitance OC sink current Current limit resistance Operating temperature Symbol VIN VEN ISW CSS* IOCS RLIM* TOP VEN VIN VIN = 2.5 V to 5.5 V -- VIN = 5.0 V, VOC = 0.4 V VIN = 5.0 V (ISW = 0.6 A) VIN = 5.0 V (ISW = 0.1 A) -- Condition -- Value Min. 2.5 0 -- -- 2.0 1.4 3.6 -20 Typ. 5.0 -- -- -- 5.0 2.0 6.2 -- Max. 5.5 5.5 0.6 10 -- 2.6 9.1 +85 Unit V V A nF mA k k C
* : For CSS, RLIM settings, see "TYPICAL CHARACTERISTICS" and "FUNCTIONAL DESCRIPTION". 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
MB3842/MB3845
s ELECTRICAL CHARACTERISTICS (per 1 ch)
* MB3842/MB3845 Parameter Switch resistance Symbol RON IIN1 IN pin input current IIN2 IIN3 UVLO threshold UVLO hysteresis width Switch current limit OC sink current Temperature protection (Tj) OUT pin rise time OUT pin fall time VIUH VIUL VIUHY ISWH ISWL IOCS IOCL TLIM tON tOFF ISW =0.6A ISW = 0 A ISW = 0.6 A EN < 0.8V for MB3842, EN = VIN for MB3845 VIN at OC = L H VIN at OC = H L VIUHY = VIUH - VIUL RLIM = 2.0 k RLIM = 6.2 k VOC = 0.4 V at OC active VOC = 5.0 V at OC non-active -- SS pin: Open OUT pin: 100 k pull down SS pin: Open OUT pin: 100 k pull down Condition Min. -- -- -- -- 2.1 1.9 100 0.42 0.06 2.0 -- +125 -- -- (VIN = 5 V, Ta = +25C) Value Unit Typ. Max. 100 350 1.0 -- 2.3 2.1 200 0.6 0.1 5.0 -- -- 100 50 150 550 1.5 1.0 2.5 2.3 300 0.78 0.14 -- 1.0 -- 200 120 m A mA A V V mV A A mA A C s s
* MB3842 Parameter ENABLE pin input current ENABLE pin threshold voltage ENABLE hysteresis width * MB3845 Parameter ENABLE pin input current ENABLE pin input voltage Symbol IENH IENL VILEN VIHEN Condition VEN = 5 V, ISW = 0 A VEN = 0 V, ISW = 0 A -- -- Min. -- -- 0 3.0 Symbol IENH IENL VTHEN VTLEN VENHY Condition VEN = 5 V, ISW = 0 A VEN = 0 V, ISW = 0 A -- -- VENHY = VTHEN - VTLEN Min. -- -- 1.45 1.25 100
(VIN = 5 V, Ta = +25C) Value Unit Typ. Max. 5 0.0 1.60 1.40 200 10 -- 1.75 1.55 300 A A V V mV
(VIN = 5 V, Ta = +25C) Value Unit Typ. Max. 0.0 0.0 -- -- -- -- 0.8 5.0 A A V V
6
MB3842/MB3845
s DIAGRAM
* Normal operation
5V VIN
EN EN SW OFF SW ON SW ON
Hi
Low
5V VOUT
IOUT OC
Overcurrent does not occur
5V
* At VIN fall
5V VIN 2.3 V 2.1 V
Hi EN EN
Low SW ON SW ON SW ON 5V
VOUT
Overcurrent does not occur IOUT
5V OC =0V
Note: The OC pin should be pulled up using a separate power supply and resistance. (This illustration shows pull-up with a separate 5V source.)
(Continued)
7
MB3842/MB3845
(Continued)
* At overcurrent detection
5V VIN
EN EN
Hi
Low SW ON OFF ON OFF 5V
VOUT
IOUT
OC
5V
=0V
* At over-temperature occurrence
5V VIN Over-temperature occurs Over-temperature corrected
EN EN SW ON VOUT SW OFF
Hi
Low
5V
Overcurrent does not occur IOUT
5V OC =0V
Latch set
Latch released
Note: The OC pin should be pulled up using a separate power supply and resistance. (This illustration shows pull-up with a separate 5V source.) 8
MB3842/MB3845
s TYPICAL CHARACTERISTICS
* RLIM vs. limit current characteristics
These are the limiting value characteristics for CS pin-to-GND external resistance and output current (OC flag).
10
1 ISW(A)
VIN = 5.0 V VIN = 3.3 V VIN = 2.5 V
0.1
0.01 100 1000 RLIM () 10000 100000
* CSS vs. TON (SS) characteristics
There are the characteristics for SS pin-to-GND external capacitance and output ON time.
100
10 tON(ms) VIN = 5.0 V VIN = 3.3 V VIN = 2.5 V 1
0.1 10 100 1000 CSS (pF) 10000 100000
(Continued)
9
MB3842/MB3845
(Continued)
* SW resistance vs. temperature characteristics
150 140 130
SW resistance (m)
120 110 100 90 80 70 60 50 -60 -40 -20 at 0.1 A at 0.6 A at 1 A
0
20
40
60
80
100
120
Temperature Ta (C)
* Temperature-depended SW resistance vs. VIN (V) characteristics
150 140
SW resistance (m)
130 120 110 100 90 80 70 60 50 2 3 4 5 6 7 -40 C 25 C 100 C
VIN voltage (V)
(Continued)
10
MB3842/MB3845
(Continued)
* Output power (ISW) saturation characteristics
Measurement circuit
5V
VIN EN, EN VIL/VIH OC ISW OUT GND RLIM VSW 5V A 2 100 k
"Open"
SS CS
These are the output saturation current characteristics in overcurrent state.(when not controlled by the OC pin warning flag)
1600
1400
RLIM not limited (CS GND)
1200
1000 ISW (mA)
RLIM set to 2.0k, 0.6A
Unlimited
6.2 k (0.1 A) 2 k (0.6 A)
800
Overcurrent flag set (when set for 0.6A)
600
Temperature protection range
400
RLIM set to 6.2k, 0.1A
200
Overcurrent flag set (when set for 0.1A)
0 0 1 2 3 VSW (V) 4 5 6
(Continued)
11
MB3842/MB3845
(Continued)
* OC pin flag pull-up resistance (pull-up power 5V) dependant overcurrent operation
1 V / 500 NS 1 k 1 V / 500 NS 50 k
GND
1 V / 500 NS
10 k
1 V / 500 NS
100 k
* Power derating characteristics
1 0.9 0.8
Power dissipation PD (W)
0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 -20
0
20
40
60
80
100
Temperature Ta (C)
12
MB3842/MB3845
s FUNCTIONAL DESCRIPTION
Current Limit Setting
By placing resistance between the CS and GND pins, the current limit can be set between 100mA and 600mA within 30% accuracy (VIN = 5 V, current limit at 600mA). Because the setting value is dependent on VIN voltage, the user should select the optimum resistance value for the value of VIN voltage . When the switching current exceeds the set value, the OC pin goes to "L" level as an external notification signal, but there is no latching function. To hold operation on "off" state, the input signal to the EN and EN pins should be used. When a direct connection to GND is used, there is no current limitation. When the connection is open, the switch is in a state of continuously held current limits.
Thermal Shutdown
The MB3842/MB3845 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 OC output signal goes to "L" level to notify external systems. The latch function can be reset by sending a low signal to the EN input of the MB3842, or a high signal to the EN input of the MB3845.
Slow Start
The on/off switching time 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. For details, see "Css vs. tON (SS) characteristics" on p. 9.
UVLO
A VIN voltage monitoring function is provided, so that when VIN voltage exceeds 2.3 V (typ) the OC pin voltage goes to "H" level. When VIN voltage falls below 2.1V (typ), the OC output goes to "L" state.
Error Flag OC Pin
The OC pin produces a "L" signal in case of a UVLO, overcurrent, or over-temperature condition. In case of overcurrent, the output has a pulse waveform. See P12. (note) Output current limit setting resistance values are shown on P9, and in the following table. (CS pin-to-GND)
Standard Values
VIN/ISW VIN 5.0V VIN 3.3V VIN 2.5V 0.1 A 6.2 k 9.1 k 13 k 0.2 A 4.3 k 5.6 k 7.5 k 0.3 A 3.3 k 4.3 k 5.1 k 0.4 A 2.7 k 3.3 k 3.9 k 0.5 A 2.2 k 2.7 k 3.0 k 0.6 A 2.0 k 2.4 k 2.7 k 0.7 A 1.8 k 2.0 k 2.2 k 0.8 A 1.6 k 1.8 k 2.0 k 0.9 A 1.4 k 1.6 k 1.8 k 1.0 A 1.3 k 1.5 k 1.6 k
13
MB3842/MB3845
s TYPICAL APPLICATION
MB3842/MB3845 Top View
Control signal
EN1 EN1
GND
CSS SS1 OC1
Pull-up resistance
RLIM CS1 OUT1
VIN1
OUT1
Load
VIN1
OUT1
VIN2
OUT2
VIN2
OUT2
Load
RLIM CS2 OUT2
Pull-up resistance
CSS SS2 OC2
Control signal
EN2 EN2
GND
14
MB3842/MB3845
s APPLICATION EXAMPLE
(1) Dual-Port Self-Powered Hub Application (NON-GANG Mode Connection)
USB 5 V Controller
Overcurrent
MB3842/MB3845 ON/OFF EN1,EN1 GND
SS1
OC1 OUT1
CS1
VIN1 Power Supply 5V VIN2
OUT1 USB Port 1
VIN1
OUT1
OUT2 USB Port 2
VIN2
OUT2
CS2
OUT2
SS2
OC2
EN2,EN2
GND
*The MB3842 can also be adapted for use with 3.3V controllers. USB Port 500mA MAX Par Port Smoothing capacitors should be placed between VIN and GND, or between OUT and GND as required.
15
MB3842/MB3845
(2) Dual-Port Bus Powered Hub Application (GANG Mode Connection)
USB
Overcurrent
MB3842/MB3845 ON/OFF EN1,EN1 GND
SS1
OC1 USB Port1(x4)
CS1
OUT1
VIN1
OUT1 400 mA MAX (100 mA x4)
VIN1 5V Upstream Port
OUT1
VIN2
OUT2 USB Port2(x4)
VIN2
OUT2
CS2
OUT2 400 mA MAX (100 mA x4)
SS2
OC2
EN2,EN2
GND
USB Port 100mA MAX Par Port Smoothing capacitors should be placed between VIN and GND, or between OUT and GND as required.
16
MB3842/MB3845
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.
6. Reverse Current Prevention Function
Current cannot flow back to the VIN pin with the switch off, even when the OUT pin voltage is higher than the VIN pin (OUT VIN), however when VIN pin voltage is lower than 1.5 V circuit functions are lost, so that in this case there is danger of reverse current flow. For applications in which reverse flow is not acceptable, set VIN 1.5 V.
s ORDERING INFORMATION
Part number MB3842PFV MB3845PFV MB3845PFV-ER Package 20-pin Plastic SSOP (FPT-20P-M03) Remarks
17
MB3842/MB3845
s PACKAGE DIMENSION
20-pin plastic SSOP (FPT-20P-M03)
*: These dimensions do not include resin protrusion.
* 6.500.10(.256.004)
1.25 -0.10 .049 -.004
+0.20 +.008
(Mounting height)
0.10(.004)
INDEX
* 4.400.10
6.400.20 (.173.004) (.252.008)
5.40(.213) NOM
0.650.12 (.0256.0047)
0.22 -0.05 .009
+0.10 +.004 -.002
"A"
0.15 -0.02 .006 -.001
+0.05 +.002
Details of "A" part 0.100.10(.004.004) (STAND OFF)
5.85(.230)REF
0
10
0.500.20 (.020.008)
C
1994 FUJITSU LIMITED F20012S-2C-4
Dimensions in mm (inches).
18
MB3842/MB3845
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 MICROELECTRONICS EUROPE GmbH Am Siebenstein 6-10 D-63303 Dreieich-Buchschlag Germany Tel: (06103) 690-0 Fax: (06103) 690-122
http://www.fujitsu-fme.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/
F0001 (c) FUJITSU LIMITED Printed in Japan
19

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