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ds04-27601-1e fujitsu semiconductor data sheet assp power management switch MB3802 n 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 con?ured with an n-ch mos to prevent reverse current at swich off. the MB3802 starts at a very low voltage (typical v in > 2.2v) and a stable on resistance is obtained irrespective of the switching voltage because the intermal dc/dc converter applies the optimum voltage for the n-ch mos gate at swith on. moreover, the load-side capacitor is discharged at switch off, and the power supply for various power supply systems is switched ef?iently. n features extremely low on resistance: r on = 0.12 w (typical) r on = 0.06 w (typical at parallel connection) reverse current protection at load side at switch off operation start at low input voltage: v in > 2.2v (typical) low power consumption at switch off: i in (input voltage) = 0 m a, v in = 0v at switch on: i in = 230 m a, v in = 5v load discharge function external control of on/off time break-before-make operation n package (fpt-16p-m04) plastic sop, 16 pin
2 MB3802 n pin assignment n pin description (scsi interface) pin no. pin symbol description 16 vin a 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. 9 vin b 3, 4 swin a switch input pins: two common pins are assigned to swin a and swin b . they serve as power-supply pins for the switch-off circuit which starts at 1.5v min. 5, 6 swin b 13, 14 swout a switch output pins: two common pins are assigned to swout a and swout b . when dcga and dcgb are high level, the load- discharge circuit starts discharge via these pins. 11, 12 swout b 2 dcg a swout a /swout b -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. 7 dcg b 15 dly a 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 m a). 10 dly b 1 gnd a ground pins for input threshold reference voltage and load discharge: when two switching circuits are used, ground both gnd pins. 8 gnd b (top view) (fpt-16p-m04) MB3802 1 2 3 4 5 6 7 8 vin a dly a swout a swout a swout b swout b dly b vin b 16 15 14 13 12 11 10 9 gnd a dcg a swin a swin a swin b swin b dcg b gnd b
3 MB3802 n block diagram and external connections n block description when v in exceeds 2.2v, 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 v in voltage. when vin is below 2.1v, 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 sw in and consumes 0.4 m a at 5v. since the n-ch mos back gate is connected to gnd, switch-off reverse current is prevented irrespective of the high level state between sw in and sw out . the load discharge circuit installed between sw out 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 sw in level is low, the switch-on time is small; when the sw in level is high, the switch-off time is small. power supply v in c d sw in sw out gnd extemal capacitor dly ddg (+) comp dc/dc converter load load discharge circuit switch-off circuit switch-on circuit switch control note: the MB3802 incorporates two switch blocks as shown above. however, gnd is common to both blocks.
4 MB3802 n absolute maximum rating (ta = +25 c) n recommended operating conditions parameter symbol condition ratings unit input voltage v in ?.3 to 7.0 v switching voltage v sw at switch off ?.3 to 7.0 v at switch on ?.3 to 7.0 switching current i sw at switch-on peak 3.6 a pemissible loss p d ta + 75 c 290 mw strage temperature p stg ?5 to +125 c parameter symbol conditions ratings unit min. typical max. input voltage v in 0 6.0 v switching level v swin at switch on 0 6.0 v at switch off 0 6.0 switching current i sw at switch on (for single switch) 1.2 a gate-pin connection capacitance c d 10nf gate-pin mounting leak current i dly ?.1 0.1 m a input voltage to load discharge circuit v dcg v in = 3v, 5v 2.5 6.0 v operating temperature t op ?0 +7.5 c
5 MB3802 n electrical characteristics 1. dc characteristics (ta = +25 c) 2. ac characteristics (ta = +25 c) parameter symbol condition ratings unit min typ max input current i in1 v in = 0v 0 m a i in2 v in = 3v 100 200 m a v in = 5v 230 460 m v swiching resistance r on1 v in = 3v, i sw = 0.5a, v swin = 3v 120 160 m w r on2 v in = 5v, i sw = 0.5a, v swin = 3v 130 175 m w switch-off leak current i l v in = 0v, v swin = 6v 0.5 2.0 m a input threshold voltage v th1 at switch on 2.0 2.2 2.4 v v th2 at switch off 1.9 2.1 2.3 v input hysteresis width v hys 50 100 mv switch resistance r on v in = 3v, 5v, i sw = 0.5a ta = ?0 to +75 c 210 m w switch charge resistance r dcg1 v swout = 3v, v dcg = 3v 750 1500 w r dcg2 v swout = 5v, v dcg = 5v 500 1000 w input voltage to switch charge circuit i dcg v dcg = 5v 0 2 m a parameter symbol condition ratings unit min typ max switch-on time t on1 v in = 0v ? 3v, v swin = 3v 100 300 900 m s t on2 v in = 0v ? 5v, v swin = 5v 50 150 450 m s switch off time t off1 v in = 3v ? 0v, v swin = 3v 20 60 180 m s t off2 v in = 5v ? 0v, v swin = 5v 10 30 150 m s switch on/off time lag t hys1 v in = 3v ? 0v, v swin = 3v 80 240 720 m s t hys2 v in = 5v ? 0v, v swin = 5v 40 120 300 m s
6 MB3802 n ac characteristic test diagrams 1. test condition 2. switch-on/off timing chart vin a gnd vin b v sb 3 v to 5 v swin a swout a swin b swout b v s a 3 v to 5 v load t r t on t off 90% 90% 90% 50% 50% 10% 10% 10% 0v sw out = sw in sw out 0v 0v v in t f note: the rise/fall times (10%/90%) of v in are both less than 1 m s.
7 MB3802 n applications 1. separate use of two switching circuits 2. switching two power supplies vin a dcg a dcg b vin b v sb 3 v to 5 v swin a swout a swin b swout b v sa 3 v to 5 v gnd load b load a notes: 1. the two power supplies v sa andv sb can be used separated by controlling the voltages vin a and vin b > 2. connect the dcd pin to gnd when it is not used. vin a gnd vin b v sb 3 v to 5 v swin a swout a swin b swout b v sa 3 v to 5 v load 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.
8 MB3802 3. switching two loads 4. connecting serial switches vin a dcg a dcg b vin b swin a swout a swin b swout b v s 3 v to 5 v gnd load b load a note: make this connection to control two different loads separately for a single power supply. vin a dcg a dcg b vin b swin a swout a swin b swout b v s 3 v to 5 v gnd load b load a note: make this connection to supply power from v s to load b via load a.
9 MB3802 5. connecting parallel switches 6. 25% on resistance vin a dly a dly b dcg a dcg b vin b swin a swout a swin b swout b v s 3 v to 5 v gnd load note: connect the circuits a and b in parallel to produce a low on resistance (r on = 0.06 w ). in this case, connect the dlya and dlyb pins in common to give synchronous on/off between both switches. vin a dly b gnd gnd dly a dcg a dcg a dcg b dcg b vin b vin a vin b swin a swout a swin b swout b v s v 3 v to 5 v swin a swout a swin b swout b load dly b dly a 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.
10 MB3802 7. low-side switch vin a r b r a vin b swin a swout a swin b swout b v sa v sb 3 v to 5 v 3 v to 5 v gnd dly a v in = 3 v,v s = 3 v 80 m s 5.0 ms switch-on time switch-off time r a and r b = 10 m w 45 m s 3.5 ms v in = 5 v,v s = 5 v dly b load a load b 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 sw in power supply, connect high resistances (r a and r b = 5 to 10 m w ) 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.
11 MB3802 n typical performance characteristics (continued) input voltage (v) 3.5 4.0 2.5 3.0 4.5 5.0 5.5 6.0 300 250 150 200 100 on resistance (input-voltage dependence) on resistance (m w ) v swin = 6 v v swin = 5 v v swin = 4 v v swin = 3 v v swin = 2 v v swin = 1 v v swin = 0 v i sw = 1 a load current (a) 0 0.2 0.4 0.6 0.8 1.0 1.2. 150 100 50 on resistance (load current dependence) switch-ontime ( m s) v swin = 5 v,v in = 3 v v swin = 5 v,v in = 5 v v swin = 3 v,v in = 3 v v swin = 3 v,v in = 5 v 0 ?5 25 50 75 ta ( ? ) 150 100 50 on resistance (temperature dependence: sw in = 3 v) on resistance (m w ) v swin = 3 v i sw = 1 a v in = 3 v v in = 5 v 0 ?5 25 50 75 150 100 50 on resistance (temperature dependence: sw in = 5 v) ta ( ? ) on resistance (m w ) v swin = 5 v i sw = 1 a v vin = 3 v v vin = 5 v 500 400 300 200 100 0 3.0 3.5 4.0 4.5 input voltage (v) switch-on time (input voltage characteristic: sw in = 3 v) switch-on time ( m s) 5.0 5.5 6.0 v swin = 3 v i sw = 1 a ta = ?5? ta = +25? ta = +75? 500 400 300 200 100 0 3.0 3.5 4.0 4.5 input voltage (v) switch-on time (input voltage characteristic: sw in = 5 v) switch ontime ( m s) 5.0 5.5 6.0 v swin = 5 v i sw = 1 a ta = ?5? ta = +25? ta = +75?
12 MB3802 (continued) switch-off time (input voltage characteristic: sw in = 3 v) 100 90 70 80 50 60 3.0 3.5 4.0 4.5 5.0 5.5 6.0 switch-off time ( m s) input voltage (v) ta = ?5? v swin = 3 v i sw = 1 a ta = +75? ta = +25? switch-off time (input voltage characteristic: sw in = 5 v) 100 90 70 80 50 60 3.0 3.5 4.0 4.5 5.0 5.5 6.0 switch-off time ( m s) input voltage (v) v swin = 5 v i sw = 1 a ta = ?5? ta = +75? ta = +25? v swin = 3 v i sw = 1 a 100 10 1 0.1 100 1000 10000 switch-on time (dly-pin connection capacitance: sw in = 3 v) on-time (ms) capacitance (pf) v in = 3 v v in = 5 v v swin = 5 v i sw = 1 a 100 10 1 0.1 100 1000 10000 switch-on time (dly-pin connection capacitance: sw in = 5 v) on-time (ms) capacitance (pf) v in = 3 v v in = 5 v 10000 1000 100 10 100 1000 10000 switch-off time (dly-pin connection capacitance: sw in = 3 v) off-time (ms) v swin = 3 v i sw = 1 a capacitance (pf) v in = 3 v v in = 5 v off-time (ms) 10000 1000 100 10 100 1000 10000 switch-off time (dly-pin connection capacitance: sw in = 5 v) v swin = 5 v i sw = 1 a capacitance (pf) v in = 3 v v in = 5 v
13 MB3802 (continued) discharge resistance (dcg voltage dependence: sw in = 3 v) 10 1 0.1 23456 discharge resistance (k w ) dcg voltage (v) v swin = 3 v i sw = 1 a ta = ?5? ta = +75? ta = +25? discharge resistance (dcg voltage dependence: sw in = 5 v) 10 1 0.1 23456 discharge resistance (k w ) dcg voltage (v) v swin = 5 v i sw = 1 a ta = +75? ta = +25? ta = ?5? v in = 0 v output leak current (at switch off) 1000 100 10 23456 leak current (na) swin voltage (v) ta = ?5? ta = +75? ta = +25? input current (input voltage dependence) 300 200 100 0 0 1.0 2.0 3.0 4.0 5.0 input current ( m a) input voltage (v) ta = ?5? ta = +75? ta = +25? switch-on resistance (relationship between v in and v s ) 6 5 4 3 2 1 0 2.5 4.0 3.0 3.5 4.5 5.0 5.5 6.0 switch voltage (v) v in voltage (v) 110 m w 105 m w 100 m w 115 m w 140 m w i sw = 1a 130 m w 120 m w surge current and output voltage boot (dly-pin connection capacitance dependence) output gnd input gnd (surge current) time open 510 pf output voltage 1000 pf open 510 pf surge current 1000 pf v in = 0 ? 5v v: 200 ma/div. (surge current) sw in = 5v v: 1.0 v/div. (output voltage) load capacitance = 47 m f h: 200 m s/div. (time axis)
14 MB3802 n package dimensions +0.40 C0.20 +.016 C.008 +0.05 C0.02 +.002 C.001 +0.25 C0.20 +.010 C.008 index 5.40 .213 0.15 .006 10.15 .400 (.252.016) (.154.012) (.018.004) (stand off) (.020.008) 0.500.20 3.900.30 6.400.40 8.89(.350)ref 0(0)min 2.10(.083)max 0.450.10 1.27(.050)typ details of "a" part 0.50(.020) 0.20(.008) 0.18(.007)max 0.68(.027)max "a" m ?0.13(.005) 0.10(.004) 1994 fujitsu limited f16012s-4c-4 c 16 pins, plastic sop (fpt-16p-m04) dimensions in mm(inches).
24 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 211-88, japan tel: (044) 754-3763 fax: (044) 754-3329 north and south america fujitsu microelectronics, inc. semiconductor division 3545 north first street san jose, ca 95134-1804, u.s.a. tel: (408) 922-9000 fax: (408) 432-9044/9045 europe fujitsu mikroelektronik gmbh am siebenstein 6-10 63303 dreieich-buchschlag germany tel: (06103) 690-0 fax: (06103) 690-122 asia pacitc fujitsu microelectronics asia pte. limited #05-08, 151 lorong chuan new tech park singapore 556741 tel: (65) 281-0770 fax: (65) 281-0220 f9703 ? fujitsu limited printed in japan 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 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 inherently a certain rate 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 control law of japan, the prior authorization by japanese government should be required for export of those products from japan.

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