????? ????? ????? ????? weltrend semiconductor, inc. ?WI@^I| 24 ? 2 2f, no. 24, industry e. 9 th rd., science-based industrial park, hsin-chu, taiwan tel:886-3-5780241 fax:886-3-5794278.5770419 email:support@weltrend.com.tw ` WT7502 pc power supply supervisor data sheet rev. 1.01 feb. 26, 2008 the information in this document is subject to chan ge without notice. ? ?? ? weltrend semiconductor, inc. all rights reserved. www.datasheet.co.kr datasheet pdf - http://www..net/
WT7502 rev. 1.01 weltrend semiconductor, inc. page 2 general description the WT7502 provides protection circuits, power good output (pgo), fault protection latch (fpob), and a protection detector function (psonb) control. it can minimize external components of switching power supply systems in personal computer. the over / under voltage detector (ovd / uvd) monit ors v33, v5 and vcc input voltage level. when ovd or uvd detect the fault voltage level, the fpob is latched high and pgo go low. when pgi detect the fault voltage level, the fpob would be kept low and pgo go low. the latch can be reset by psonb go high. there is 3.5 ms delay time for psonb turn off fpob. when pgi and ovd and uvd detect the right voltage l evel, the power good output (pgo) will be issue. features ? the over / under voltage detector (ovd / uvd) mon itors v33, v5 and vcc input voltage. ? both of the power good output (pgo) and fault prot ection latch (fpob) are open drain output. ? 75 ms time delay for uvd. ? 300 ms time delay for pgo. ? 38 ms for psonb input signal de?bounce. ? 73 us for pgi / uvd internal signal de?glitches. ? 55 us for ovd internal signal de?glitches. ? 3.5 ms time delay for psonb turn-off fpob. ? the uvd would been disabled when pgi < 1.2v. pin assignment and package type ordering information package 8?pin plastic dip 8?pin plastic sop chip WT7502?n084 WT7502?s084 lead?free pb WT7502?n084 pb WT7502?s084 pb WT7502-hxxx the top-side marking would be added a dot in the right side for lead-free package. pgi gnd fpob psonb pgo vcc v5 v33 8 7 6 5 1 2 3 4 WT7502 www.datasheet.co.kr datasheet pdf - http://www..net/
WT7502 rev. 1.01 weltrend semiconductor, inc. page 3 pin description pin name type description pgi i power good input signal pin gnd p ground fpob o fault protection output pin, open drain output psonb i on/off switch input v33 i 3.3v over voltage & under voltage & over current s ense input pin v5 i 5v over voltage & under voltage & over current sen se input pin vcc i power supply pgo o power good output signal pin, open drain output block diagram WT7502 r s q + - + - + - + - + - + - + - vcc vcci psonb v33 v5 vcc fpob pgo pgi 55us 73us clr debounce clr debounce 1.2v un un ov un ov ov 300ms 75ms WT7502a-084 block diagram 1.2v un clr clr 73us debounce delay delay clr 3.5ms power on reset clr delay pwr 1.2v ~ 1.8v 38ms power reference internal bandgap osc pwr clk vcci = 3.6v vref = 1.2v pwr debounce www.datasheet.co.kr datasheet pdf - http://www..net/
WT7502 rev. 1.01 weltrend semiconductor, inc. page 4 absolute maximum ratings parameter min. max. unit supply voltage, vcc ?0.3 16 v input voltage pgi, psonb, v5, v33 ?0.3 vcc + 0.3 max. 7v v pgo ?0.3 7 v output voltage fpob ?0.3 16 v operating temperature -40 125 storage temperature -55 150 *note: stresses above those listed may cause perman ent damage to the devices recommended operating conditions parameter conditions min. typ. max. unit supply voltage, vcc 4 12 15 v input voltage pgi, psonb, v5, v33 7 v pgo 7 v output voltage fpob 15 v fpob 0.3v 10 ma output sink current pgo 0.3v 10 ma supply voltage rising time 1 ms electrical characteristics, at ta=25 c and v cc =5v . over voltage detection parameter condition min. typ. max. unit v33 3.7 3.9 4.1 v v5 5.7 6.1 6.2 v over voltage threshold vcc 12.9 13.4 13.9 v i leakage leakage current (fpob) v(fpob) = 5v 5 ua i sink =10ma 0.3 v ol low level output voltage (fpob) i sink =30ma 0.7 v under voltage detection pgi pgo parameter condition min. typ. max. unit v33 2.55 2.69 2.83 v v5 4.1 4.3 4.47 v under voltage threshold vcc 8.8 9.3 9.8 v input threshold voltage (pgi) 1.16 1.20 1.24 v i leakage leakage current (pgo) pgo = 5v 5 ua v ol low level output voltage(pgo) i sink =10ma 0.3 v psonb parameter condition min. typ. max. unit input pull-up current psonb= 0v 150 ua high-level input voltage 1.8 v low-level input voltage 1.2 v www.datasheet.co.kr datasheet pdf - http://www..net/
WT7502 rev. 1.01 weltrend semiconductor, inc. page 5 total device parameter condition min. typ. max. unit icc supply current pdon _n= 5v 1 ma vcc start-up voltage 3.6 v vcc stop voltage after start-up 3.0 v switching characteristics, vcc=5v parameter condition min. typ. max. unit t db1 de-bounce time (psonb) 24 38 52 ms t delay1 delay time (pgi to pgo) 200 300 400 ms t db2 de-bounce time (psonb) 24 38 52 ms t g1 de-glitch time for pgi 47 73 100 us t g2 de-glitch time for uvd 47 73 100 us t g3 de-glitch time for ovd 35 55 75 us t delay2 psonb to fpob delay time t db2 +2.0 t db2 +3.5 t db2 +5.0 ms t delay3 internal uvd delay time after fpob go low & every time pgi > 1.2v 49 75 100 ms application circuit pgi psonb v33 v5 vcc fpob gnd pgo r4=100 +5vsb d1 +12v pgo +5vsb +3.3v +5v 0.01uf r5=300 10k +5vsb psonb pgi +5vsb +5v 1k note1 the series resistor r5 at psonb can not be omitted. r0 = 300 is suggested note2 the series resistor r4 = 100 and diode d1 at pgo is suggested. www.datasheet.co.kr datasheet pdf - http://www..net/
WT7502 rev. 1.01 weltrend semiconductor, inc. page 6 application timming 1.) pgi (under_voltage) psonb fpob pgo pgi t db1 t delay1 +t g1 t db2 t delay2 t delay1 +t g1 t g1 www.datasheet.co.kr datasheet pdf - http://www..net/
WT7502 rev. 1.01 weltrend semiconductor, inc. page 7 2.) v33 / v5 / vcc uvd psonb fpob pgo v33 / v5 / vcc t db1 t delay1 +t g1 t db2 t delay2 psonb fpob pgo pgi v33 / v5 / vcc t db1 t delay1 +t g1 t db2 t delay2 t delay3 +t g2 t db1 www.datasheet.co.kr datasheet pdf - http://www..net/
WT7502 rev. 1.01 weltrend semiconductor, inc. page 8 3.) v33 / v5 / vcc ovp psonb fpob pgo v33 / v5 / vcc t db1 t delay1 +t g1 t db2 t delay2 psonb fpob pgo v33 / v5 / vcc t db1 t delay1 +t g1 t db2 t delay2 t g3 t db1 www.datasheet.co.kr datasheet pdf - http://www..net/
WT7502 rev. 1.01 weltrend semiconductor, inc. page 9 mechanical information plastic dual?in?line 8pin package note 1 all linear dimensions are in inches millimeters . note 2 this drawing is subject to change without notice. note 3 falls within jedec ms?001 www.datasheet.co.kr datasheet pdf - http://www..net/
WT7502 rev. 1.01 weltrend semiconductor, inc. page 10 plastic small?outline 8pin package note 1 all linear dimensions are in inches millimeters . note 2 this drawing is subject to change without notice. note 3 falls within jedec ms?012 www.datasheet.co.kr datasheet pdf - http://www..net/
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