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FUJITSU SEMICONDUCTOR DATA SHEET
DS04-27601-2E
ASSP For Power Supply Applications
Power Management Switch
MB3802
s DESCRIPTION
The MB3802 is a power management switch incorporating two switch circuits with extremely low ON resistance. NO diode is required because the switch block is configured with an N-ch MOS to prevent reverse current at switch OFF. The MB3802 starts at a very low voltage (typical VIN > 2.2V) and a stable ON resistance is obtained irrespective of the switching voltage because the internal DC/DC converter applies the optimum voltage for the N-ch MOS gate at switch ON. Moreover, the load-side capacitor is discharged at switch OFF, and the power supply for various power supply systems is switched efficiently.
s FEATURES
* Extremely low ON resistance: RON = 0.12 (typical) RON = 0.06 (typical at parallel connection) * Reverse current protection at load side at switch OFF * Operation start at low input voltage: VIN > 2.2 V (typical) * Low power consumption At switch OFF: IIN (input voltage) = 0 A, VIN = 0 V At switch ON: IIN = 230 A, VIN = 5 V * Load discharge function * External control of ON/OFF time * Break-before-make operation
s PACKAGE
16-pin plastic SOP
(FPT-16P-M04)
MB3802
s PIN ASSIGNMENT
(TOP VIEW)
GNDA DCGA SWINA SWINA SWINB SWINB DCGB GNDB 1 2 3 4 MB3802 5 6 7 8 12 11 10 9 SWOUTB SWOUTB DLYB VINB 16 15 14 13 VINA DLYA SWOUTA SWOUTA
(FPT-16P-M04)
s PIN DESCRIPTION (SCSI Interface)
Pin No. 16 9 3, 4 5, 6 13, 14 11, 12 2 7 15 Pin symbol VINA VINB SWINA SWINB SWOUTA SWOUTB DCGA DCGB DLYA Description These pins switch ON at High level and OFF at Low level. They serve as power-supply pins for the DC/DC converter to generate the switch gate voltage. Switch Input pins: Two common pins are assigned to SWINA and SWINB. They serve as power-supply pins for the switch-OFF circuit which starts at 1.5V min. Switch output pins: Two common pins are assigned to SWOUTA and SWOUTB. When DCGA and DCGB are High level, the loaddischarge circuit starts discharge via these pins. SWOUTA/SWOUTB-side discharge control pins: These pins are used to discharge from the load-side capacitor at switch OFF. Connect them to GND when discharge is not required. Switch-ON/OFF control pins: The ON/OFF time can be delayed by connecting an external capacitor. Both times are delayed about three fold by installing a 500-pF capacitor between these pins and GND. Leave these pins open when they are not used. 10V may be generated when these pins are open. To keep these pins at high impedance, take care to mount the device so that no current leaks (less than 0.1 A). Ground pins for input threshold reference voltage and load discharge: When two switching circuits are used, ground both GND pins.
10 1 8 2
DLYB GNDA GNDB
MB3802
s BLOCK DIAGRAM AND EXTERNAL CONNECTIONS
CD Extemal capacitor Power supply DLY
SW IN
Switch-ON circuit DC/DC converter
Comp
V IN
SW OUT Switch-OFF circuit (+) Switch control Load Load discharge circuit DDG
GND
Note: The MB3802 incorporates two switch blocks as shown above. However, GND is common to both blocks.
s BLOCK DESCRIPTION
The MB3802 is a one-way switching IC with the SWIN and SWOUT pins serving respectively for input and output. When VIN exceeds 2.2 V, the Comp. starts driving the DC/DC converter to switch the N-ch MOS and applies the optimum voltage for the switch gate. The DC/DC converter boosts the VIN voltage. When VIN is below 2.1 V, the Comp. stops the DC/DC converter, starts the switch-OFF circuit, and discharges the voltage from the switch gate to GND. The switch-OFF circuit is powered from the SWIN and consumes 0.4A at 5 V. Since the N-ch MOS back gate is connected to GND, switch-OFF reverse current is prevented irrespective of the High level state between SWIN and SWOUT. Note, however, that turning the VIN pin on/off with 1.5 V or less applied to the SWIN pin may cause reverse current to flow because the switch-off circuit does not work then. For the method of compensating for the operation of the switch-off circuit, see section "sAPPLICATIONS 7.Lowside Switch." The load discharge circuit installed between SWOUT and GND is powered by the DCG pin, and discharges the load-side capacitor at switch OFF. When it is not necessary to discharge the load, connect the DCG pin to GND. The DLY pins are for connection to an external capacitor to delay the switch-ON/OFF time. The surge current at the load side is cut at power-on by controlling the switch-ON time. The switch-ON time depends on the boot time of the DC/DC converter. Consequently, when the VIN level is high and the SWIN level is low, the switch-ON time is small; when the SWIN level is high, the switch-OFF time is small.
3
MB3802
s ABSOLUTE MAXIMUM RATING
Parameter Input Voltage Switching voltage Switching current Permissible loss Storage Temperature Symbol VIN VSW ISW PD TSTG Condition -- At switch OFF At switch ON At switch-ON peak Ta + 75C -- Ratings -0.3 to 7.0 -0.3 to 7.0 -0.3 to 7.0 3.6 290 -55 to +125 (Ta = +25C) 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 Switching level Switching current Gate-pin connection capacitance Gate-pin mounting leak current Input voltage to load discharge circuit Operating temperature Symbol VIN VSWIN ISW CD IDLY VDCG Top Conditions -- At switch ON At switch OFF At switch on (for single switch) -- -- VIN = 3V, 5V -- Ratings Min. 0 0 0 -- -- -0.1 2.5 -40 Typical -- -- -- -- -- -- -- -- Max. 6.0 6.0 6.0 1.2 10 0.1 6.0 +7.5 Unit V V A nF A V C
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.
4
MB3802
s ELECTRICAL CHARACTERISTICS
1. DC Characteristics
(Ta = +25C) Parameter Symbol IIN1 Input current IIN2 RON1 Swiching resistance RON2 Switch-OFF leak current Input threshold voltage Input hysteresis width Switch resistance Switch charge resistance Input voltage to switch charge circuit IL VTH1 VTH2 VHYS RON RDCG1 RDCG2 IDCG Condition VIN = 0 V VIN = 3 V VIN = 5 V VIN = 3 V, ISW = 0.5 A, VSWIN = 3 V VIN = 5 V, ISW = 0.5 A, VSWIN = 3 V VIN = 0 V, VSWIN = 6 V At switch ON At switch OFF -- VIN = 3 V, 5 V, ISW = 0.5 A Ta = -40C to +75C VSWOUT = 3 V, VDCG = 3 V VSWOUT = 5 V, VDCG = 5 V VDCG = 5 V Ratings Min -- -- -- -- -- -- 2.0 1.9 50 -- -- -- -- Typ 0 100 230 120 130 0.5 2.2 2.1 100 -- 750 500 0 Max -- 200 460 160 175 2.0 2.4 2.3 -- 210 1500 1000 2 Unit A A A m m A V V mV m A
2. AC Characteristics
(Ta = +25C) Parameter Switch-ON time Switch OFF time Switch ON/OFF time lag Symbol tON1 tON2 tOFF1 tOFF2 tHYS1 tHYS2 Condition VIN = 0V 3V, VSWIN = 3V VIN = 0V 5V, VSWIN = 5V VIN = 3V 0V, VSWIN = 3V VIN = 5V 0V, VSWIN = 5V VIN = 3V / 0V, VSWIN = 3V VIN = 5V / 0V, VSWIN = 5V Ratings Min 20 20 5 5 10 10 Typ 300 150 60 30 240 120 Max 900 450 180 150 720 300 Unit s s s s s s
5
MB3802
s AC CHARACTERISTIC TEST DIAGRAMS
1. Test Condition
Open DLY
VIN
SWIN
SWOUT
1A VS = 3 V/5 V
GND DCG R Load current = 1 A
R = 3 /5
2. Switch-ON/OFF Timing Chart
tr tf
VIN
50%
90%
90% 50% 10%
0V
10%
= SWIN
90%
SWOUT
0V
tON
SW OUT
10% t OFF
0V
Note: The rise/fall times (10%/90%) of VIN are both less than 1s. 6
MB3802
s APPLICATIONS
1. Separate Use of Two Switching Circuits
DCGA VINA
SWINA SWOUTA SWINB
VINB GND
SWOUTB VSB DCGB Load B 3 V to 5 V Load A VSA 3 V to 5 V
Notes: 1. The two power supplies VSA andVSB can be used separated by controlling the voltages VINA and VINB. 2. Connect the DCD pin to GND when it is not used.
2. Switching Two Power Supplies
VINA
SWINA SWOUTA SWINB
VINB GND
SWOUTB VSB Load 3 V to 5 V VSA 3 V to 5 V
Note: When using different power supplies for a single load, control them by connecting an external capacitor so that both switches are not ON at the same time.
7
MB3802
3. Switching Two Loads
DCGA VINA
SWINA SWOUTA SWINB
VINB GND
SWOUTB VS DCGB Load B Load A 3 V to 5 V
Note: Make this connection to control two different loads separately for a single power supply.
4. Connecting Serial Switches
DCGA VINA
SWINA SWOUTA SWINB
VINB GND
SWOUTB VS DCGB Load B Load A 3 V to 5 V
Note: Make this connection to supply power from VS to load B via load A.
8
MB3802
5. Connecting Parallel Switches
DLYA VINA SWINA SWOUTA SWINB VINB GND VS DLYB DCGB Load 3 V to 5 V SWOUTB DCGA
Note: Connect the circuits A and B in parallel to produce a low ON resistance (RON = 0.06 ). In this case, connect the DLYA and DLYB pins in common to give synchronous ON/OFF between both switches.
6. 25% ON Resistance
DCGA VINA
DLYA
SWINA SWOUTA SWINB
VINB DLYB
SWOUTB GND DCGB Load VS 3 V to 5 V
DCGA VINA DLYA SWINA SWOUTA SWINB VINB DLYB SWOUTB GND DCGB
Notes: 1. Make this connection to produce an ON resistance that is much lower than the above connection. Also, connect the DLY pins in common. 2. Consider the difference between the ON resistances and the switch-ON/OFF times between two devices (MB3802) and insure that load control is not offset at one device.
9
MB3802
7. Low-side Switch
VINA
SWINA SWOUTA SWINB SWOUTB GND DLYA RA DLYB RB
Load A
VINB
Load B
VSB 3 V to 5 V
VSA 3 V to 5 V
VIN = 3 V,VS = 3 V Switch-ON time Switch-OFF time 80 s 5.0 ms
VIN = 5 V,VS = 5 V 45 s 3.5 ms
RA and RB = 10 M
Notes: 1. Make this connection to control the switch ON/OFF at the lower load side. 2. To assist the switch-OFF circuit operation driven by the SWIN power supply, connect high resistances (RA and RB = 5 to 10 M) to the DLY pins without overloading the DC/DC converter. 3. At this connection, the switch-OFF time is longer than the switch-ON time.
10
MB3802
s TYPICAL PERFORMANCE CHARACTERISTICS
ON Resistance (Input-voltage dependence)
300 ISW = 1 A VSWIN = 6 V VSWIN = 5 V VSWIN = 4 V VSWIN = 3 V VSWIN = 2 V VSWIN = 1 V VSWIN = 0 V
ON Resistance (Load current dependence)
150 VSWIN = 5 V,VIN = 3 V VSWIN = 5 V,VIN = 5 V
ON resistance (m)
Switch-ONTime (s)
250
200
100
150
VSWIN = 3 V,VIN = 3 V VSWIN = 3 V,VIN = 5 V
100 2.5
50 3.0 3.5 4.0 4.5 5.0 5.5 6.0
0
0.2
0.4
Input voltage (V) ON Resistance (Temperature dependence: SWIN = 3 V)
VSWIN = 3 V ISW = 1 A
Load current (A)
0.6
0.8
1.0
1.2.
150
150
ON Resistance (Temperature dependence: SWIN = 5 V)
VSWIN = 5 V ISW = 1 A
ON resistance (m)
ON resistance (m)
100
100
VIN = 3 V VIN = 5 V 50 50 -25 0 25 50 75 -25 0 25
VVIN = 3 V VVIN = 5 V 50 75
Ta (C) Switch-ON time (Input voltage characteristic: SWIN = 3 V)
VSWIN = 3 V ISW = 1 A 400 500
Ta (C) Switch-ON time (Input voltage characteristic: SWIN = 5 V)
VSWIN = 5 V ISW = 1 A 400
500
Switch-ON time (s)
300
Switch ONtime (s)
300 Ta = -25C Ta = +25C
200
Ta = -25C Ta = +25C
200
100 Ta = +75C 0 3.0 3.5 4.0 4.5 5.0 5.5 6.0
100 Ta = +75C 0 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input voltage (V)
Input voltage (V)
(Continued)
11
MB3802
Switch-OFF Time (Input voltage characteristic: SWIN = 3 V)
100 VSWIN = 3 V ISW = 1 A 100
Switch-OFF Time (Input voltage characteristic: SWIN = 5 V)
VSWIN = 5 V ISW = 1 A
Switch-OFF time (s)
80
Ta = -25C Ta = +25C
Switch-OFF time (s)
90
90
80
70 Ta = +75C 60
70 Ta = -25C Ta = +25C Ta = +75C
60
50 3.0
3.5
4.0
4.5
5.0
5.5
6.0
50 3.0
3.5
4.0
4.5
5.0
5.5
6.0
Input voltage (V) Switch-ON Time (DLY-pin connection capacitance: SWIN = 3 V)
100 VSWIN = 3 V ISW = 1 A 100
Input voltage (V) Switch-ON Time (DLY-pin connection capacitance: SWIN = 5 V)
VSWIN = 5 V ISW = 1 A
ON-time (ms)
10
ON-time (ms)
10
1 VIN = 3 V VIN = 5 V 0.1 100
1 VIN = 3 V VIN = 5 V 0.1 100
1000
10000
1000
10000
Capacitance (pF) Switch-OFF Time (DLY-pin connection capacitance: SWIN = 3 V)
VSWIN = 3 V ISW = 1 A
Capacitance (pF) Switch-OFF Time (DLY-pin connection capacitance: SWIN = 5 V)
VSWIN = 5 V ISW = 1 A
10000
10000
OFF-time (ms)
OFF-time (ms)
1000
1000
100 VIN = 3 V VIN = 5 V 10 100
100 VIN = 3 V VIN = 5 V 10 100
1000
10000
1000
10000
Capacitance (pF)
Capacitance (pF)
(Continued)
12
MB3802
(Continued)
Discharge Resistance (DCG voltage dependence: SWIN = 3 V)
10 VSWIN = 3 V ISW = 1 A
10 VSWIN = 5 V ISW = 1 A
Discharge Resistance (DCG voltage dependence: SWIN = 5 V)
Discharge resistance (k)
Discharge resistance (k)
1 Ta = +75C Ta = +25C
1
Ta = +75C Ta = +25C
Ta = -25C
Ta = -25C 0.1 2 3 4 5 6
0.1 2 3 4 5 6
DCG voltage (V)
Output Leak Current (at switch OFF)
1000 300
DCG voltage (V)
Input Current (Input voltage dependence)
Leak current (nA)
Input current (A)
200 Ta = +75C Ta = +25C 100 Ta = -25C
100 Ta = +75C Ta = +25C Ta = -25C VIN = 0 V 10
0 2 3 4 5 6
0
1.0
2.0
3.0
4.0
5.0
SWIN voltage (V)
Surge Current and Output Voltage Boot (DLY-pin connection capacitance dependence)
Input voltage (V)
Switch-On resistance (relationship between VIN and VS)
6 140 m 5 130 m 120 m 115 m
Switch voltage (V)
Open 510 pF Output voltage 1000 pF Open 510 pF Surge current 1000 pF
4 110 m 3 2 1 100 m ISW = 1A 0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 105 m
Output GND Input GND (Surge current) Time
VIN voltage (V)
VIN = 0 5 V SWIN = 5 V Load capacitance = 47 F
V: 200 mA/div. (surge current) V: 1.0 V/div. (output voltage) H: 200 s/div. (time axis) 13
MB3802
s PACKAGE DIMENSIONS
16-pin plastic FTP (FTP-16P-M04)
10.15 -0.20 .400 -.008
+0.25 +.010
2.10(.083)MAX
0(0)MIN (STAND OFF) INDEX 3.900.30 (.154.012) 6.400.40 (.252.016) 5.40 -0.20 +.016 .213 -.008
+0.40
1.27(.050)TYP
0.450.10 (.018.004)
O0.13(.005)
M
0.15 -0.02 +.002 .006 -.001 Details of "A" part
+0.05
0.500.20 (.020.008)
0.20(.008)
0.10(.004) 8.89(.350)REF
"A" 0.50(.020) 0.18(.007)MAX 0.68(.027)MAX
C
1994 FUJITSU LIMITED F16012S-4C-4
Dimensions in mm (inch)
14
MB3802
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
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http://www.fmap.com.sg/
F9902 (c) FUJITSU LIMITED Printed in Japan

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