ASSP Power Supply Applications Power Management 2-ch Switch
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DS04-27604-1E
ASSP Power Supply Applications
Power Management 2-ch Switch
MB3842/MB3845
DESCRIPTION
MB3842/3845 power management switch with built-in 2-channel low-on resistance (typ. 100m) switch. Output control means control signal, MB3842 designed high-active operation (output when Hi), while MB3845 designed low-active operation (output when low.) provide adaptability variety operations, MB3842/3845 features input voltage (VIN 2.5V) operation stable low-on resistance independent input voltage. switching current limit from 100mA 600mA using external resistance, when overcurrent conditions detected output goes provide external notification signal. divided between channels, which operate independently each other. addition, off-state reverse current prevention function provided ensure accurate on/off switching action.
FEATURES
resistance switch (typ. 100m) input voltage operation (2.5 Switch current (max. UVLO :VIN threshold 2.3V/2.1 hysteresis ENABLE threshold 1.4V/1.6 MB3842, MB3845 :Power supply current output 0.8V MB3842, MB3845 External setting soft start time switch current limit. Over-temperature detection (switch latched off), over-current detection (not latched) flag following overcurrent detection, over-temperature detection, UVLO detection. Reverse current prevention (VIN Either channel operated alone.
PACKAGE
20-pin plastic SSOP
(FPT-20P-M03)
MB3842/MB3845
ASSIGNMENT
EN1,
OUT1
VIN1
SSOP-20P (FPT-20P-M03)
OUT1
VIN1
OUT1
VIN2
OUT2
VIN2
OUT2
OUT2
EN2,
Enable Current
Enable Over Current
Slow Start
functions differ MB3842 MB3845. MB3842/EN MB3845
MB3842/MB3845
DESCRIPTION
Symbol (MB3842) 1/10 (MB3845) Descriptions Control signal input pin. turn switch turn toff. less, chip STBY state current consumption less than 1µA. level 1.4V (typ), level 1.6V (typ), with 200mV (typ) hysteresis. Control signal input pin. turn switch turn off. level VIN, chip STBY state current consumption less than 1µA. Normally used CMOS inverter input, that recommended level +0.5V less, level -0.5V greater. Slow start setting pin. Used adjust switch on/off timing. external capacitance delay operation. Leave open when use. open mode voltages present. Care should taken mounting prevent leakage current generation because high impedance required. Current limit setting pin. limit current level connecting this external resistance. Switch output pin. UVLO (VIN power monitor function) provided that when reaches 2.3V (typ.) higher voltage goes level. Also voltage drops (typ.) lower output goes state. 200mV (typ) hysteresis provided. Ground pin. External notification pin. When switch mode this normally outputs level signal, changes level when overcurrent, overtemperature, UVLO condition detected. This open drain connection, should pulled high potential using resistance. Switching output pin.(N-ch MOSFET source)
4/5/6/7
11/20
12/19
13/14/15 16/17/18
MB3842/MB3845
BLOCK DIAGRAM (for channel)
MB3842 OUT1
Charge pump1
Over current detection
COMP
OSC1
COMP
VIN1 BGR1
Temperature protection
MB3845 OUT1
Charge pump1
Over current detection
COMP
OSC1
COMP
VIN1 BGR1
Temperature protection
MB3842/MB3845
ABSOLUTE MAXIMUM RATINGS
Parameter Input voltage ENABLE voltage Switch current Power dissipation Storage temperature Symbol TSTG +85°C Condition Rating Max. -0.3 -0.3 Min. +125 Unit
WARNING: Semiconductor devices permanently damaged application stress (voltage, current, temperature, etc.) excess absolute maximum ratings. exceed these ratings.
RECOMMENDED OPERATING CONDITIONS
Parameter Input voltage ENABLE voltage Switch current capacitance sink current Current limit resistance Operating temperature Symbol CSS* IOCS RLIM* (ISW (ISW Condition Value Min. Typ. Max. Unit
CSS, RLIM settings, "TYPICAL CHARACTERISTICS" "FUNCTIONAL DESCRIPTION". WARNING: recommended operating conditions required order ensure normal operation semiconductor device. device's electrical characteristics warranted when device operated within these ranges. Always semiconductor devices within their recommended operating condition ranges. Operation outside these ranges adversely affect reliability could result device failure. warranty made with respect uses, operating conditions, combinations represented data sheet. Users considering application outside listed conditions advised contact their FUJITSU representatives beforehand.
MB3842/MB3845
ELECTRICAL CHARACTERISTICS (per
MB3842/MB3845 Parameter Switch resistance Symbol IIN1 input current IIN2 IIN3 UVLO threshold UVLO hysteresis width Switch current limit sink current Temperature protection (Tj) rise time fall time VIUH VIUL VIUHY ISWH ISWL IOCS IOCL TLIM tOFF =0.6A 0.8V MB3842, MB3845 VIUHY VIUH VIUL RLIM RLIM active non-active pin: Open pin: pull down pin: Open pin: pull down Condition Min. 0.42 0.06 +125 (VIN +25°C) Value Unit Typ. Max. 0.78 0.14
MB3842 Parameter ENABLE input current ENABLE threshold voltage ENABLE hysteresis width MB3845 Parameter ENABLE input current ENABLE input voltage Symbol IENH IENL VILEN VIHEN Condition Min. Symbol IENH IENL VTHEN VTLEN VENHY Condition VENHY VTHEN VTLEN Min. 1.45 1.25
(VIN +25°C) Value Unit Typ. Max. 1.60 1.40 1.75 1.55
(VIN +25°C) Value Unit Typ. Max.
MB3842/MB3845
DIAGRAM
Normal operation
VOUT
IOUT
Overcurrent does occur
fall
VOUT
Overcurrent does occur IOUT
Note: should pulled using separate power supply resistance. (This illustration shows pull-up with separate source.)
(Continued)
MB3842/MB3845
(Continued)
overcurrent detection
VOUT
IOUT
over-temperature occurrence
Over-temperature occurs Over-temperature corrected
VOUT
Overcurrent does occur IOUT
Latch
Latch released
Note: should pulled using separate power supply resistance. (This illustration shows pull-up with separate source.)
MB3842/MB3845
TYPICAL CHARACTERISTICS
RLIM limit current characteristics
These limiting value characteristics pin-to-GND external resistance output current flag).
ISW(A)
0.01 1000 RLIM 10000 100000
(SS) characteristics
There characteristics pin-to-GND external capacitance output time.
tON(ms)
1000 (pF) 10000 100000
(Continued)
MB3842/MB3845
(Continued)
resistance temperature characteristics
resistance
Temperature (°C)
Temperature-depended resistance characteristics
resistance
voltage
(Continued)
MB3842/MB3845
(Continued)
Output power (ISW) saturation characteristics
Measurement circuit
VIL/VIH RLIM
These output saturation current characteristics overcurrent state.(when controlled warning flag)
1600
1400
RLIM limited GND)
1200
1000 (mA)
RLIM 2.0k, 0.6A
Unlimited
(0.1 (0.6
Overcurrent flag (when 0.6A)
Temperature protection range
RLIM 6.2k, 0.1A
Overcurrent flag (when 0.1A)
(Continued)
MB3842/MB3845
(Continued)
flag pull-up resistance (pull-up power dependant overcurrent operation
Power derating characteristics
Power dissipation
Temperature (°C)
MB3842/MB3845
FUNCTIONAL DESCRIPTION
Current Limit Setting
placing resistance between pins, current limit between 100mA 600mA within ±30% accuracy (VIN current limit 600mA). Because setting value dependent voltage, user should select optimum resistance value value voltage When switching current exceeds value, goes level external notification signal, there latching function. hold operation "off" state, input signal pins should used. When direct connection used, there current limitation. When connection open, switch state continuously held current limits.
Thermal Shutdown
MB3842/MB3845 thermal shutdown function which turns switch sets latch protect device when junction temperature exceeds 125°C. same time output signal goes level notify external systems. latch function reset sending signal input MB3842, high signal input MB3845.
Slow Start
on/off switching time delayed applying capacitance between pins. Controlling time soften surge current load side capacitance when power turned details, "Css (SS) characteristics"
UVLO
voltage monitoring function provided, that when voltage exceeds (typ) voltage goes level. When voltage falls below 2.1V (typ), output goes state.
Error Flag
produces signal case UVLO, overcurrent, over-temperature condition. case overcurrent, output pulse waveform. P12. (note) Output current limit setting resistance values shown following table. pin-to-GND)
Standard Values
VIN/ISW 5.0V 3.3V 2.5V
MB3842/MB3845
TYPICAL APPLICATION
MB3842/MB3845 View
Control signal
Pull-up resistance
RLIM OUT1
VIN1
OUT1
Load
VIN1
OUT1
VIN2
OUT2
VIN2
OUT2
Load
RLIM OUT2
Pull-up resistance
Control signal
MB3842/MB3845
APPLICATION EXAMPLE
Dual-Port Self-Powered Application (NON-GANG Mode Connection)
Controller
Overcurrent
MB3842/MB3845 ON/OFF EN1,EN1
OUT1
VIN1 Power Supply VIN2
OUT1 Port
VIN1
OUT1
OUT2 Port
VIN2
OUT2
OUT2
EN2,EN2
*The MB3842 also adapted with 3.3V controllers. Port 500mA Port Smoothing capacitors should placed between GND, between required.
MB3842/MB3845
Dual-Port Powered Application (GANG Mode Connection)
Overcurrent
MB3842/MB3845 ON/OFF EN1,EN1
OUT1
VIN1
OUT1 (100
VIN1 Upstream Port
OUT1
VIN2
OUT2
VIN2
OUT2
OUT2 (100
EN2,EN2
Port 100mA Port Smoothing capacitors should placed between GND, between required.
MB3842/MB3845
USAGE PRECAUTION
Never settings exceeding maximum rated conditions.
Exceeding maximum rated conditions cause permanent damage LSI. Also, recommended that recommended operating conditions observed normal use. Exceeding recommended operating conditions adversely affect reliability.
this device within recommended operating conditions.
Recommended operating conditions values within which normal operation warranted. Standard electrical characteristics warranted within range recommended operating conditions within listed conditions each parameter.
Printed circuit board ground lines should with consideration common impedance. Take appropriate static electricity measures.
Containers semiconductor materials should have anti-static protection made conductive material. After mounting, printed circuit boards should stored shipped conductive bags containers. Work platforms, tools, instruments should properly grounded. Working personnel should grounded with resistance between body ground.
apply negative voltages.
negative voltages below -0.3 create parasitic transistors lines, which cause abnormal operation.
Reverse Current Prevention Function
Current cannot flow back with switch off, even when voltage higher than (OUT VIN), however when voltage lower than circuit functions lost, that this case there danger reverse current flow. applications which reverse flow acceptable,
ORDERING INFORMATION
Part number MB3842PFV MB3845PFV MB3845PFV-ER Package 20-pin Plastic SSOP (FPT-20P-M03) Remarks
MB3842/MB3845
PACKAGE DIMENSION
20-pin plastic SSOP (FPT-20P-M03)
These dimensions include resin protrusion.
6.50±0.10(.256±.004)
1.25 -0.10 .049 -.004
+0.20 +.008
(Mounting height)
0.10(.004)
INDEX
4.40±0.10
6.40±0.20 (.173±.004) (.252±.008)
5.40(.213)
0.65±0.12 (.0256±.0047)
0.22 -0.05 .009
+0.10 +.004 -.002
0.15 -0.02 .006 -.001
+0.05 +.002
Details part 0.10±0.10(.004±.004) (STAND OFF)
5.85(.230)REF
0.50±0.20 (.020±.008)
1994 FUJITSU LIMITED F20012S-2C-4
Dimensions (inches).
MB3842/MB3845
FUJITSU LIMITED
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
Rights Reserved. contents this document subject change without notice. Customers advised consult with FUJITSU sales representatives before ordering. information circuit diagrams this document presented examples semiconductor device applications, intended incorporated devices actual use. Also, FUJITSU unable assume responsibility infringement patent rights other rights third parties arising from this information circuit diagrams. FUJITSU semiconductor devices intended standard applications (computers, office automation other office equipment, industrial, communications, measurement equipment, personal household devices, etc.). CAUTION: Customers considering products special applications where failure abnormal operation directly affect human lives cause physical injury property damage, where extremely high levels reliability demanded (such aerospace systems, atomic energy controls, floor repeaters, vehicle operating controls, medical devices life support, etc.) requested consult with FUJITSU sales representatives before such use. company will responsible damages arising from such without prior approval. semiconductor devices have inherent chance failure. must protect against injury, damage loss from such failures incorporating safety design measures into your facility equipment such redundancy, fire protection, prevention over-current levels other abnormal operating conditions. products described this document represent goods technologies subject certain restrictions export under Foreign Exchange Foreign Trade Japan, prior authorization Japanese government will required export those products from Japan.
http://www.fujitsu.co.jp/
North South America FUJITSU MICROELECTRONICS, INC. Semiconductor Division 3545 North First Street Jose, 95134-1804, Tel: (408) 922-9000 Fax: (408) 922-9179 Customer Response Center Mon. Fri.: (PST) Tel: (800) 866-8608 Fax: (408) 922-9179
http://www.fujitsumicro.com/
Europe FUJITSU MIKROELEKTRONIK GmbH 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 #05-08, Lorong Chuan Tech Park Singapore 556741 Tel: (65) 281-0770 Fax: (65) 281-0220
http://www.fmap.com.sg/
F9905 FUJITSU LIMITED Printed Japan
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