FUJITSU SEMICONDUCTOR DATA SHEET DS04-27601-2E ASSP For Power Supply Applications Power Management Switch MB3802 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. 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 PACKAGE 16-pin plastic SOP (FPT-16P-M04) MB3802 PIN ASSIGNMENT (TOP VIEW) GNDA 1 16 VINA DCGA 2 15 DLYA SWINA 3 14 SWOUTA SWINA 4 13 SWOUTA MB3802 SWINB 5 12 SWOUTB SWINB 6 11 SWOUTB DCGB 7 10 DLYB GNDB 8 9 VINB (FPT-16P-M04) PIN DESCRIPTION (SCSI Interface) 2 Pin No. Pin symbol 16 VINA 9 VINB 3, 4 SWINA 5, 6 SWINB 13, 14 SWOUTA 11, 12 SWOUTB 2 DCGA 7 DCGB 15 DLYA 10 DLYB 1 GNDA 8 GNDB 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. MB3802 BLOCK DIAGRAM AND EXTERNAL CONNECTIONS CD Extemal capacitor DLY Power supply 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. 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 "APPLICATIONS 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 ABSOLUTE MAXIMUM RATING Symbol Condition Ratings (Ta = +25C) Unit Input Voltage VIN -- -0.3 to 7.0 V Switching voltage VSW At switch OFF -0.3 to 7.0 At switch ON -0.3 to 7.0 Switching current ISW At switch-ON peak 3.6 A Permissible loss PD Ta + 75C 290 mW -55 to +125 C Parameter Storage Temperature TSTG -- V 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 Input voltage Switching level Symbol Conditions VIN -- VSWIN Ratings Unit Min. Typical Max. 0 -- 6.0 At switch ON 0 -- 6.0 At switch OFF 0 -- 6.0 At switch on (for single switch) -- -- 1.2 A V V Switching current ISW Gate-pin connection capacitance CD -- -- -- 10 nF Gate-pin mounting leak current IDLY -- -0.1 -- 0.1 A Input voltage to load discharge circuit VDCG 2.5 -- 6.0 V -40 -- +7.5 C Operating temperature Top VIN = 3V, 5V -- 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 ELECTRICAL CHARACTERISTICS 1. DC Characteristics (Ta = +25C) Parameter Symbol Input threshold voltage Unit Typ Max VIN = 0 V -- 0 -- A VIN = 3 V -- 100 200 A VIN = 5 V -- 230 460 A RON1 VIN = 3 V, ISW = 0.5 A, VSWIN = 3 V -- 120 160 m RON2 VIN = 5 V, ISW = 0.5 A, VSWIN = 3 V -- 130 175 m IL VIN = 0 V, VSWIN = 6 V -- 0.5 2.0 A VTH1 At switch ON 2.0 2.2 2.4 V VTH2 At switch OFF 1.9 2.1 2.3 V 50 100 -- mV IIN2 Swiching resistance Switch-OFF leak current Ratings Min IIN1 Input current Condition Input hysteresis width VHYS Switch resistance RON VIN = 3 V, 5 V, ISW = 0.5 A Ta = -40C to +75C -- -- 210 m RDCG1 VSWOUT = 3 V, VDCG = 3 V -- 750 1500 RDCG2 VSWOUT = 5 V, VDCG = 5 V -- 500 1000 VDCG = 5 V -- 0 2 A Switch charge resistance Input voltage to switch charge circuit IDCG -- 2. AC Characteristics (Ta = +25C) Parameter Switch-ON time Switch OFF time Switch ON/OFF time lag Symbol Condition tON1 Ratings Unit Min Typ Max VIN = 0V 3V, VSWIN = 3V 20 300 900 s tON2 VIN = 0V 5V, VSWIN = 5V 20 150 450 s tOFF1 VIN = 3V 0V, VSWIN = 3V 5 60 180 s tOFF2 VIN = 5V 0V, VSWIN = 5V 5 30 150 s tHYS1 VIN = 3V / 0V, VSWIN = 3V 10 240 720 s tHYS2 VIN = 5V / 0V, VSWIN = 5V 10 120 300 s 5 MB3802 AC CHARACTERISTIC TEST DIAGRAMS 1. Test Condition Open DLY VIN SWIN 1A SWOUT VS = 3 V/5 V GND DCG Load current = 1 A R R = 3 /5 2. Switch-ON/OFF Timing Chart tr tf 90% VIN 90% 50% 0V 50% 10% 10% = SWIN 90% SWOUT 0V tON SW OUT 10% t OFF Note: The rise/fall times (10%/90%) of VIN are both less than 1s. 6 0V MB3802 APPLICATIONS 1. Separate Use of Two Switching Circuits DCGA VINA SWINA SWOUTA SWINB VINB SWOUTB GND VSB DCGB Load B 3 V to 5 V VSA Load A 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 SWOUTB GND Load VSB VSA 3 V to 5 V 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 SWOUTB GND 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 SWOUTB GND VS DCGB Load B Load A Note: Make this connection to supply power from VS to load B via load A. 8 3 V to 5 V MB3802 5. Connecting Parallel Switches DCGA DLYA VINA SWINA SWOUTA SWINB VINB SWOUTB GND VS DLYB DCGB 3 V to 5 V Load 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 DCGA VINA VS Load 3 V to 5 V 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 Load A SWOUTA SWINB VINB Load B SWOUTB GND VIN = 3 V,VS = 3 V Switch-ON time Switch-OFF time 80 s 5.0 ms DLYA DLYB RA RB VSB 3 V to 5 V VSA 3 V to 5 V 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 TYPICAL PERFORMANCE CHARACTERISTICS ON Resistance (Load current dependence) ON Resistance (Input-voltage dependence) 150 ISW = 1 A VSWIN = 6 V VSWIN = 5 V VSWIN = 4 V VSWIN = 3 V VSWIN = 2 V VSWIN = 1 V VSWIN = 0 V 250 200 150 100 2.5 150 VSWIN = 5 V,VIN = 3 V VSWIN = 5 V,VIN = 5 V Switch-ONTime (s) ON resistance (m) 300 100 VSWIN = 3 V,VIN = 3 V VSWIN = 3 V,VIN = 5 V 50 3.0 3.5 4.0 4.5 5.0 5.5 6.0 0.2 0.4 0.6 0.8 ON Resistance (Temperature dependence: SWIN = 5 V) 150 VSWIN = 5 V ISW = 1 A ON resistance (m) 100 VVIN = 3 V VVIN = 5 V VIN = 3 V VIN = 5 V 50 -25 0 25 Ta (C) 50 75 0 25 50 VSWIN = 5 V ISW = 1 A 400 Switch ONtime (s) 400 300 200 Ta = -25C Ta = +25C 100 300 Ta = -25C Ta = +25C 200 100 Ta = +75C 0 75 Switch-ON time (Input voltage characteristic: SWIN = 5 V) 500 VSWIN = 3 V ISW = 1 A Switch-ON time (s) -25 Ta (C) Switch-ON time (Input voltage characteristic: SWIN = 3 V) 500 1.2. ON Resistance (Temperature dependence: SWIN = 3 V) 100 50 1.0 Load current (A) VSWIN = 3 V ISW = 1 A ON resistance (m) 0 Input voltage (V) 3.0 3.5 4.0 4.5 5.0 Input voltage (V) 5.5 Ta = +75C 6.0 0 3.0 3.5 4.0 4.5 5.0 5.5 6.0 Input voltage (V) (Continued) 11 MB3802 Switch-OFF Time (Input voltage characteristic: SWIN = 3 V) Switch-OFF Time (Input voltage characteristic: SWIN = 5 V) 100 100 VSWIN = 5 V ISW = 1 A 90 Switch-OFF time (s) Switch-OFF time (s) VSWIN = 3 V ISW = 1 A Ta = -25C 80 Ta = +25C 70 Ta = +75C 60 50 3.0 3.5 4.0 4.5 5.0 5.5 90 80 70 50 3.0 6.0 Input voltage (V) 4.0 4.5 100 VSWIN = 3 V ISW = 1 A 10 1 10000 6.0 10 1 VIN = 3 V VIN = 5 V 1000 0.1 100 10000 1000 10000 Capacitance (pF) Capacitance (pF) Switch-OFF Time (DLY-pin connection capacitance: SWIN = 3 V) Switch-OFF Time (DLY-pin connection capacitance: SWIN = 5 V) 10000 VSWIN = 5 V ISW = 1 A OFF-time (ms) VSWIN = 3 V ISW = 1 A OFF-time (ms) 5.5 VSWIN = 5 V ISW = 1 A VIN = 3 V VIN = 5 V 0.1 100 5.0 Switch-ON Time (DLY-pin connection capacitance: SWIN = 5 V) ON-time (ms) ON-time (ms) 3.5 Input voltage (V) Switch-ON Time (DLY-pin connection capacitance: SWIN = 3 V) 100 Ta = -25C Ta = +25C Ta = +75C 60 1000 100 1000 100 VIN = 3 V VIN = 5 V VIN = 3 V VIN = 5 V 10 100 1000 Capacitance (pF) 10000 10 100 1000 10000 Capacitance (pF) (Continued) 12 MB3802 (Continued) Discharge Resistance (DCG voltage dependence: SWIN = 3 V) Discharge Resistance (DCG voltage dependence: SWIN = 5 V) 10 10 VSWIN = 5 V ISW = 1 A Discharge resistance (k) Discharge resistance (k) VSWIN = 3 V ISW = 1 A 1 Ta = +75C Ta = +25C Ta = +75C Ta = +25C 1 Ta = -25C Ta = -25C 0.1 2 3 4 5 0.1 6 2 3 4 5 6 DCG voltage (V) DCG voltage (V) Input Current (Input voltage dependence) Output Leak Current (at switch OFF) 1000 Input current (A) Leak current (nA) 300 100 Ta = +75C Ta = +25C Ta = -25C 200 Ta = +75C Ta = +25C 100 Ta = -25C VIN = 0 V 10 0 2 3 4 5 6 0 1.0 2.0 4.0 5.0 Switch-On resistance (relationship between VIN and VS) Surge Current and Output Voltage Boot (DLY-pin connection capacitance dependence) 6 140 m 130 m 5 Open 510 pF Surge current 1000 pF Output GND 120 m 115 m Switch voltage (V) Open 510 pF Output voltage 1000 pF 4 110 m 3 105 m 2 1 Input GND (Surge current) 100 m ISW = 1A 0 Time VIN = 0 5 V SWIN = 5 V Load capacitance = 47 F 3.0 Input voltage (V) SWIN voltage (V) 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 VIN voltage (V) V: 200 mA/div. (surge current) V: 1.0 V/div. (output voltage) H: 200 s/div. (time axis) 13 MB3802 PACKAGE DIMENSIONS 16-pin plastic FTP (FTP-16P-M04) +0.25 +.010 10.15 -0.20 .400 -.008 2.10(.083)MAX 0(0)MIN (STAND OFF) INDEX 1.27(.050)TYP 3.900.30 (.154.012) 0.450.10 (.018.004) +0.40 5.40 -0.20 +.016 .213 -.008 6.400.40 (.252.016) +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) 0.10(.004) 8.89(.350)REF "A" 0.50(.020) 0.18(.007)MAX 0.68(.027)MAX C 14 1994 FUJITSU LIMITED F16012S-4C-4 Dimensions in mm (inch) MB3802 FUJITSU LIMITED 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. The products described in this document are designed, developed and manufactured as contemplated for general use, including without limitation, ordinary industrial use, general office use, personal use, and household use, but are not designed, developed and manufactured as contemplated (1) for use accompanying fatal risks or dangers that, unless extremely high safety is secured, could have a serious effect to the public, and could lead directly to death, personal injury, severe physical damage or other loss (i.e., nuclear reaction control in nuclear facility, aircraft flight control, air traffic control, mass transport control, medical life support system, missile launch control in weapon system), or (2) for use requiring extremely high reliability (i.e., submersible repeater and artificial satellite). Please note that Fujitsu will not be liable against you and/or any third party for any claims or damages arising in connection with above-mentioned uses of the products. 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. F9902 FUJITSU LIMITED Printed in Japan