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sp6660ds/11 sp6660 200ma charge pump inverter or doubler ? copyright 2000 sipex corporation 1 n inverts or doubles input supply voltage n 93% power efficiency at 3.6v n 10khz/80khz selectable oscillator n external oscillator up to 700khz n 5 w output resistance at 3.6v n low voltage battery operation n ideal for 3.6v lithium ion battery n high output current C 200ma n pin-compatible high-current upgrade of the icl7660 and 660 industry standard n smallest package available for the 660 industry standard C 8pin m soic 200ma charge pump inverter or doubler sp6660 description the sp6660 is a cmos dc-dc monolithic voltage converter that can be implemented as a voltage inverter or a positive voltage doubler. as a voltage inverter, a -1.5v to -4.25v output can be converted from a +1.5v to +4.25v input. as a voltage doubler, the sp6660 can provide a +8.0v output at 100ma from a +4.25v input. the sp6660 is ideal for both battery-powered and board level voltage conversion applications with a typical operating current of 400 m a and a high efficiency (>90%) over most of its load-current range. typical end products for this device are operational amplifier and interface power supplies, medical instruments, and hand- held and laptop computers. the sp6660 is available in 8-pin dip, soic, and m soic packages. osc out sp6660 +v in +1.5v to +4.25v c1 1 m f to 150 m f 5 1 2 7 4 fc c2 1 m f to 150 m f cap+ cap- gnd 6 8 3 lv negative voltage output typical circuit: voltage inverter +v osc out sp6660 +v in +1.5v to +4.25v c1 1 m f to 150 m f 5 1 2 7 4 fc c2 1 m f to 150 m f cap+ cap- gnd 6 8 3 lv double voltage output typical circuit: voltage doubler +v ?
sp6660ds/11 sp6660 200ma charge pump inverter or doubler ? copyright 2000 sipex corporation 2 r e t e m a r a p. n i m. p y t. x a ms t i n us n o i t i d n o c 0 5 1 h t i w y c n e u q e r f w o l t a t i u c r i c r e t r e v n i m m m m m s r o t i c a p a c f t , n e p o = c f , f 0 5 1 = 2 c = 1 c , v 6 . 3 = + v b m a t = n i m t o t x a m o t r e f e r ; 1 e r u g i f 2 e t o n . t i u c r i c t s e t e g a t l o v y l p p u s5 . 13 9 . 05 2 . 4vr l 0 0 5 = w 4 e t o n , t n e r r u c y l p p u s4 . 08 . 0a md a o l o n t n e r r u c t u p t u o0 0 2a m t n e r r u c t u p n i r o t a l l i c s o1 a y c n e u q e r f r o t a l l i c s o50 10 2z h k e c n a t s i s e r t u p t u o2 . 50 1 w i l 3 e t o n , a m 0 0 1 = y c n e i c i f f e n o i s r e v n o c e g a t l o v0 0 . 9 96 9 . 9 9%d a o l o n y c n e i c i f f e r e w o p8 8 0 8 3 6 4 9 5 8 0 7 % r l 0 0 5 = w i l a m 0 0 1 = i l a m 0 0 2 = 0 5 1 h t i w y c n e u q e r f w o l t a t i u c r i c r e l b u o d m m m m m s r o t i c a p a c f t , n e p o = c f , f 0 5 1 = 2 c = 1 c , v 6 . 3 = + v b m a t = n i m t o t x a m o t r e f e r ; 2 e r u g i f 2 e t o n . t i u c r i c t s e t e g a t l o v y l p p u s5 . 25 . 15 2 . 4vr l k 1 = w 4 e t o n , t n e r r u c y l p p u s4 . 08 . 0a md a o l o n t n e r r u c t u p t u o0 0 2a m t n e r r u c t u p n i r o t a l l i c s o1 a y c n e u q e r f r o t a l l i c s o50 10 2z h k e c n a t s i s e r t u p t u o2 . 50 1i l 3 e t o n , a m 0 0 1 = y c n e i c i f f e n o i s r e v n o c e g a t l o v0 0 . 9 96 9 . 9 9%d a o l o n y c n e i c i f f e r e w o p1 9 9 8 9 7 6 9 3 9 5 8 % r l k 1 = w i l a m 0 0 1 = i l a m 0 0 2 = absolute maximum ratings these are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. exposure to absolute maximum rating conditions for extended periods of time may affect reliability. power supply voltage (v+ to gnd or gnd to out).........................................+4.5v lv input voltages........................(out - 0.3v) to (v+ + 0.3v) fc and osc input voltages..................the least negative of (out - 0.3v) or (v+ - 4.5v) to (v+ + 0.3v) specifications out and v+ continuous output current.....................250ma output short-circuit duration to gnd.................................1s operating temperature ranges sp6660c_........................................0?c to +70?c sp6660e_.....................................-40?c to +85?c continuous power dissipation (t amb = 70?c) pdip (derate 9.09mw/?c above +70?c)..................727mw nsoic (derate 5.88mw/?c above +70?c)...............471mw m soic (derate 4.10mw/?c above +70?c)................330mw operating temperature...................................-40?c to +85?c storage temperature....................................-65?c to +150?c lead temperature (soldering 10s)..............................+300?c w
sp6660ds/11 sp6660 200ma charge pump inverter or doubler ? copyright 2000 sipex corporation 3 note 1: specified output resistance is a combination of internal switch resistance and capacitor esr. note 2: in the test circuit capacitors c1 and c2 are 150 m f, 0.2 maximum esr, tantalum or 22 m f, 0.2 maximum esr, tantalum. capacitors with higher esr may reduce output voltage and efficiency. refer to capacitor selection section. note 3: specified output resistance is a combination of internal switch resistance and capacitor esr. refer to capacitor selection section. note 4: typical value indicates start-up voltage. specifications (continued) r e t e m a r a p. n i m. p y t. x a ms t i n us n o i t i d n o c 2 2 h t i w y c n e u q e r f h g i h t a t i u c r i c r e t r e v n i m m m m m s r o t i c a p a c f t , + v = c f , f 2 2 = 2 c = 1 c , v 6 . 3 = + v b m a t = n i m t o t x a m o t r e f e r ; 1 e r u g i f 2 e t o n . t i u c r i c t s e t e g a t l o v y l p p u s5 . 17 9 . 05 2 . 4vr l 0 0 5 = w 4 e t o n , t n e r r u c y l p p u s6 . 05 . 1a md a o l o n t n e r r u c t u p t u o0 0 2a m t n e r r u c t u p n i r o t a l l i c s o8 a y c n e u q e r f r o t a l l i c s o0 40 80 6 1z h k e c n a t s i s e r t u p t u o0 . 50 1 w i l 3 e t o n , a m 0 0 1 = y c n e i c i f f e n o i s r e v n o c e g a t l o v0 0 . 9 96 9 . 9 9%d a o l o n y c n e i c i f f e r e w o p6 8 0 8 3 6 2 9 6 8 1 7 % r l 0 0 5 = w i l a m 0 0 1 = i l a m 0 0 2 = 2 2 h t i w y c n e u q e r f h g i h t a t i u c r i c r e l b u o d m m m m m s r o t i c a p a c f t , + v = c f , f 2 2 = 2 c = 1 c , v 6 . 3 = + v b m a t = n i m t o t x a m o t r e f e r ; 2 e r u g i f 2 e t o n . t i u c r i c t s e t e g a t l o v y l p p u s5 . 26 . 15 2 . 4vr l k 1 = w 4 e t o n , t n e r r u c y l p p u s6 . 05 . 1a md a o l o n t n e r r u c t u p t u o0 0 2a m t n e r r u c t u p n i r o t a l l i c s o8 a y c n e u q e r f r o t a l l i c s o0 40 80 6 1z h k e c n a t s i s e r t u p t u o0 . 50 1 w i l 3 e t o n , a m 0 0 1 = y c n e i c i f f e n o i s r e v n o c e g a t l o v0 0 . 9 96 9 . 9 9%d a o l o n y c n e i c i f f e r e w o p0 9 9 8 9 7 4 9 3 9 5 8 % r l k 1 = w i l a m 0 0 1 = i l a m 0 0 2 =
sp6660ds/11 sp6660 200ma charge pump inverter or doubler ? copyright 2000 sipex corporation 4 pin assignments pin 1 fc frequency control for the internal oscillator. fc = open,f os c = 10khz typical; fc = v+, f osc = 80khz typical pin 2 cap+ connect to the positive terminal of the charge pump capacitor. pin 3 gnd (voltage inverter circuit) ground. pin 3 gnd (positive voltage doubler circuit) positive supply voltage input. pin 4 cap- connect to the negative terminal of the charge pump capacitor. pin 5 out (voltage inverter circuit) negative voltage output pin. pin 5 out (positive voltage doubler circuit) ground pin for power supply. pin 6 lv low-voltage operation input pin in 660 circuits. in sp6660 circuits can be connected to gnd, out or left open as desired with no effect. pin 7 osc control pin for the oscillator. internally connected to 15pf capacitor. an external capacitor can be added to slow the oscillator. be careful to minimize stray capitance. an external oscillator can be connected to overdrive the osc pin. pin 8 v+ (voltage inverter circuit) positive voltage input pin for the power supply. pin 8 v+ (positive voltage doubler circuit) positive voltage output. pinout cap+ fc gnd cap- out lv osc v+ sp6660 8 7 4 3 2 1 5 6
sp6660ds/11 sp6660 200ma charge pump inverter or doubler ? copyright 2000 sipex corporation 5 description the sp6660 charge pump dc-dc voltage converter either inverts or doubles the input voltage. as a negative voltage inverter, as shown in figure 1 , a +1.5v to +4.25v input can be converted to a -1.5v to -4.25v output. figure 2 , as a positive voltage doubler, a +2.5v to +4.25v input can be converted to a +5.0v to +8.5v output. figure 1. sp6660 test circuit for the voltage inverter osc out sp6660 +v in c1 5 1 2 7 4 cap+ cap- gnd 6 8 3 lv test circuit: voltage inverter fc v+ r l c2 i l i s v out typical performance curves in figures 3 to 20 are generated using the test circuits found in figure 1 and figure 2 . four operating modes are shown in the curves: voltage inverter in low and high frequency modes and voltage doubler in low and high frequency modes. figure 2. test circuit for the positive voltage doubler osc out sp6660 +v in c1 5 1 2 7 4 c2 cap+ cap- gnd 6 8 3 lv test circuit: voltage doubler +v i s fc r l v out
sp6660ds/11 sp6660 200ma charge pump inverter or doubler ? copyright 2000 sipex corporation 6 inverter doubler hf lf hf lf figure 3a and 3b supply current vs. supply voltage typical performance characteristics v in = +3.6v, t amb = 25 o c unless otherwise noted. lf = low frequency, fc = open, c1 = c2 = 150 m f. hf = high frequency, fc = v+, c1 = c2 = 22 m f. inverter circuit use figure 1 . doubler circuit use figure 2 . supply current (ma) supply current (ma) figure 4. supply current vs. oscillator frequency supply current (ma) supply voltage (v) supply voltage (v) 3a: doubler 3b: inverter oscillator frequency (khz) 4 3 2 1 0 1 10 100 1000 0.8 0.6 0.4 0.2 0 1 1.5 2 2.5 3 3.5 4 4.5 0.6 0.5 0.4 0.3 0.2 0.1 0 1.5 2 2.5 3 3.5 4 4.5
sp6660ds/11 sp6660 200ma charge pump inverter or doubler ? copyright 2000 sipex corporation 7 g v+ = 3.6v v+ = 2.5v v+ = 1.5v typical performance characteristics v in = +3.6v, t amb = 25 o c unless otherwise noted. lf = low frequency, fc = open, c1 = c2 = 150 m f. hf = high frequency, fc = v+, c1 = c2 = 22 m f. inverter circuit use figure 1 . doubler circuit use figure 2 . figure 5. output voltage drop vs. load current C inverter lf figure 6. power efficiency vs. load current C inverter lf v+ = 3.6v v+ = 2.5v v+ = 1.5v voltage drop (v) power efficiency (%) figure 7. output voltage vs. oscillator frequency inverter il = 10ma inverter il = 100ma inverter il = 200ma doubler il = 10ma doubler il = 100ma doubler il = 200ma output voltage (v) load current (ma) 0 50 100 150 200 250 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 load current (ma) 0 50 100 150 200 250 100 95 90 85 80 75 70 65 60 oscillator frequency (khz) 1 10 100 1000 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8
sp6660ds/11 sp6660 200ma charge pump inverter or doubler ? copyright 2000 sipex corporation 8 typical performance characteristics v in = +3.6v, t amb = 25 o c unless otherwise noted. lf = low frequency, fc = open, c1 = c2 = 150 m f. hf = high frequency, fc = v+, c1 = c2 = 22 m f. inverter circuit use figure 1 . doubler circuit use figure 2 . figure 8. power efficiency vs. oscillator frequency figure 9. oscillator frequency vs. supply voltage C hf inverter il = 10ma inverter il = 100ma inverter il = 200ma doubler il = 10ma doubler il = 100ma d bl il 200 a oscillator frequency (khz) power efficiency (%) figure 10. oscillator frequency vs. supply voltage C lf oscillator frequency (khz) 60 50 40 30 20 10 0 supply voltage (v) supply voltage (v) oscillator frequency (khz) 1 10 100 1000 100 90 80 70 60 1 1.5 2 2.5 3 3.5 4 4.5 1 1.5 2 2.5 3 3.5 4 4.5 8 6 4 2 0
sp6660ds/11 sp6660 200ma charge pump inverter or doubler ? copyright 2000 sipex corporation 9 typical performance characteristics v in = +3.6v, t amb = 25 o c unless otherwise noted. lf = low frequency, fc = open, c1 = c2 = 150 m f. hf = high frequency, fc = v+, c1 = c2 = 22 m f. inverter circuit use figure 1 . doubler circuit use figure 2 . figure 11. oscillator frequency vs. external capacitance figure 12. oscillator frequency vs. temperature where fc=v+ figure 13. oscillator frequency vs. temperature where fc=open temperature (c) temperature (c) lf hf oscillator frequency (khz) capacitance (pf) 1 10 100 1000 10000 100 10 1 0.1 0.01 oscillator frequency (khz) -50 -25 0 25 50 75 100 60 40 20 0 -50 -25 0 25 50 75 100 oscillator frequency (khz) 7 6 5 4 3 2 1 0
sp6660ds/11 sp6660 200ma charge pump inverter or doubler ? copyright 2000 sipex corporation 10 typical performance characteristics v in = +3.6v, t amb = 25 o c unless otherwise noted. lf = low frequency, fc = open, c1 = c2 = 150 m f. hf = high frequency, fc = v+, c1 = c2 = 22 m f. inverter circuit use figure 1 . doubler circuit use figure 2 . figure 15. output source resistance vs. temperature inverter lf output resistance (ohms) figure 14. output source resistance vs. supply voltage figure 16. output source resistance vs. temperature where inverter hf output resistance (ohms) temperature (c) temperature (c) lf hf output source resistance (ohms) 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 16.0 12.0 8.0 4.0 0.0 supply voltage (v) -50 -25 0 25 50 75 100 7 6 5 4 3 2 1 0 -50 -25 0 25 50 75 100 7 6 5 4 3 2 1 0
sp6660ds/11 sp6660 200ma charge pump inverter or doubler ? copyright 2000 sipex corporation 11 figure 17. output noise and ripple - doubler lf figure 18. output noise and ripple - inverter lf figure 19. output noise and ripple - doubler hf typical performance characteristics v in = +3.6v, t amb = 25 o c unless otherwise noted. lf = low frequency, fc = open, c1 = c2 = 150 m f. hf = high frequency, fc = v+, c1 = c2 = 22 m f. inverter circuit use figure 1 . doubler circuit use figure 2 . figure 20. output noise and ripple - inverter hf v in = 3.6v v out = 6.66v i l = 100ma v in = 3.6v v out = -3.06v i l = 100ma v in = 3.6v v out = 6.66v i l = 100ma v in = 3.6v v out = -3.06v i l = 100ma
sp6660ds/11 sp6660 200ma charge pump inverter or doubler ? copyright 2000 sipex corporation 12 theory of operation negative voltage inverter this is the most common application of the sp6660 where a +1.5v to +4.25v input is converted to a -1.5v to -4.25v output. in the inverting mode, the sp6660 is typically operated with lv connected to gnd. since the lv may be left open, the substitution of the sp6660 for the icl7660 industry standard is simplified. the circuit for the voltage inverter mode can be found in figure 21 . this operating circuit uses only two external capacitors, c1 and c2, for the internal charge pump. this allows designers to avoid any emi concerns with the costly, space-consuming inductors typically used with switching regulators. figure 21. typical operating circuit for the voltage inverter osc out sp6660 +v in +1.5v to +4.25v c1 1 m f to 150 m f 5 1 2 7 4 fc c2 1 m f to 150 m f cap+ cap- gnd 6 8 3 lv negative voltage output typical circuit: voltage inverter +v the sp6660 is insensitive to load current changes. output source resistance vs. supply voltage and temperature curves are shown in figures 14 to 16 . a typical output source resistance of 5.2 w allows an output voltage of -4.25v under light load with an input of +4.25v. this output voltage decreases to only -4.0v with a load current draw of 100ma. the peak-to-peak output ripple voltage is calculated as follows: v ripple = + i out (esr c2 ) i out 2(f pump )(c2)
sp6660ds/11 sp6660 200ma charge pump inverter or doubler ? copyright 2000 sipex corporation 13 for a nominal f pump of 5khz (where f osc =10khz) and c2=150 m f with an esr of 0.2 w , the ripple is approximately 90mv with a 100ma load current. if c2 is raised to 390 m f, the ripple drops to 45mv. the output ripple voltage is calculated by noting that capacitor c2 supplies the output current during one-half of the charge pump cycle. osc is internally connected to a 15pf capacitor. an external capacitor can be added to slow the oscillator. designers should take care to minimize stray capacitance. an external oscillator may also be connected to overdrive osc. refer to the oscillator control section for further details. figure 22. typical operating circuit for the positive voltage doubler osc out sp6660 +v in +1.5v to +4.25v c1 1 m f to 150 m f 5 1 2 7 4 fc c2 1 m f to 150 m f cap+ cap- gnd 6 8 3 lv double voltage output typical circuit: voltage doubler +v positive voltage doubler the sp6660 can double the output voltage of an input power supply or battery. from a +4.25v input, the circuit in figure 22 can provide 100ma with +8.0v at v+. the no-load voltage output at v+ is 2(v inl ). lv may be tied to out pin for all input voltages in the positive voltage doubler mode. connect the power-supply positive voltage input to gnd pin. connect the power-supply ground input to out pin. v+ is the positive voltage output in this mode. designers may overdrive osc in the positive voltage doubler mode. refer to the oscillator control section for further details.
sp6660ds/11 sp6660 200ma charge pump inverter or doubler ? copyright 2000 sipex corporation 14 oscillator control refer to figure 23 for a table of the four control modes of the sp6660 internal oscillator frequencies. in the first mode, fc and osc are open (unconnected) and the internal oscillator typically runs at 10khz. osc is internally connected to a 15pf capacitor. in the second mode, fc is connected to v+. the charge and discharge current at osc changes from 1.0 m a to 8.0 m a, increasing the oscillator frequency eight times to 80khz. in the third mode, the oscillator frequency is lowered by connecting a capacitor between osc and gnd. fc can still multiply the frequency by eight times in this mode, but for a lower range of frequencies. refer to figure 11 for these ranges. in the fourth mode, any standard cmos logic output can be used to drive osc. osc may be overdriven by an external oscillator that swings between v in and gnd. when osc is overdriven, fc has no effect. unlike the 7660 and 660 industry standards, designers may overdrive the oscillator of the sp6660 in both the inverting and the voltage doubling mode. figure 23. four control modes for the sp6660 oscillator frequency c fc s o r o t a l l i c s o y c n e u q e r fy c n e u q e r f y c n e u q e r f y c n e u q e r fy c n e u q e r f n e p on e p ol a c i p y t z h k 0 1 + vn e p ol a c i p y t z h k 0 8 + v r o n e p o l a n r e t x e r o t i c a p a c o t r e f e r 1 1 e r u g i f n e p o l a n r e t x e k c o l c k c o l c l a n r e t x e y c n e u q e r f optimizing loss conditions losses in sp6660 applications can be anticipated from the following: 1. output resistance: v loss w = i load x r out where v loss w is the voltage drop due to the sp6660 output resistance, i load is the load current, and r out is the sp6660 output resistance. 2. charge pump capacitor esr: v lossc1 ? 4 x esr c1 x i load where v lossc1 is the voltage drop due to the charge pump capacitor, c1, esr c1 is the esr of c1, and i load is the load current. the loss in c1 is larger than the loss in the reservoir capacitor, c2, because it handles a current almost four times larger than the load current during charge- pump operation. as a result of this, a change in the capacitor esr has a much greater impact on the performance of the sp6660 for c1 than for c2. 3. reservoir capacitor esr: v lossc2 = esr c2 x i load where v lossc2 is the voltage drop due to the reservoir capacitor c2, esr c2 is the esr of c2, and i load is the load current. increasing the capacitance of c2 and/or reducing its esr can reduce the output ripple that may be caused by the charge pump. a designer can filter high-frequency noise at the output by implementing a low esr capacitor at c2. generally, capacitors with larger capacitance values and higher voltage ratings tend to reduce esr.
sp6660ds/11 sp6660 200ma charge pump inverter or doubler ? copyright 2000 sipex corporation 15 optimizing capacitor selection refer to figure 24 for the total output resistance for various capacitance values and oscillator frequencies. the reservoir and charge pump capacitor values are equal. the capacitance values required to maintain comparable ripple and output resistance typically diminish proportionately as the pump frequency of the sp6660 increases. the test conditions for the curves of figure 24 are the same as for figures 2 to 20 for the circuits in figures 1 and 2 ; additional conditions are as follows: c1 = c2 = 0.2 w esr capacitors r out = 4.2 w the flat portion of the curves shown at a 5.2 w effective output resistance is a result of the sp6660's 5.25 w output resistance where 5.2 w = r out(sp6660) + (4 x esr c1 ) + esr c2 . instead of the typical 5.2 w , r out = 4.2 w is used because the typical specification includes the effect of the esrs of the capacitors used in the test circuit in figures 1 and 2 . refer to figures 17, 18, 19 and 20 for the output currents using 0.33 m f to 220 m f capacitors. output currents are plotted for 3.0v and 4.5v inputs taking into consideration a 10% to 20% loss in the input voltage. the sp6660 5.2 w series resistance limits increases in output current vs. capacitance for values much higher than 47 m f. larger values may still be useful to reduce ripple. designing a multiple of the sp6660 negative inverted output voltage the sp6660 can be cascaded to allow a designer to provide a multiple of the negative inverted output voltage of a single sp6660 device. the approximate total output resistance, r tot ,of the cascaded sp6660 devices is equal to the sum of the individual sp6660 output resistance values, r out . the output voltage, v tot , is a multiple of the number of cascaded sp6660 devices and the output voltage of an individual sp6660 device, v out . refer to figure 25 for the circuit cascading sp6660 devices. note that the capacitance value of c1 for the charge pump and c2 at v out is multiplied respectively to the number of cascaded sp6660 devices. connecting the sp6660 in parallel sp6660 devices can be connected in parallel to reduce the total output resistance. the approximate total output resistance, r tot , of the multiple devices connected in parallel is equal to the output resistance of an individual sp6660 device divided by the total number of devices connected. refer to figure 26 for the circuit connecting multiple sp6660 devices in parallel. note that only the charge pump capacitor value of c1 is multiplied respectively by the number of sp6660 connected in parallel. a single capacitor c2 at the output voltage v out of the "nth" device connected in parallel serves all devices connected.
sp6660ds/11 sp6660 200ma charge pump inverter or doubler ? copyright 2000 sipex corporation 16 osc out sp6660 +v in c1 5 1 2 7 4 fc c2 cap+ cap- gnd 6 8 3 lv osc out sp6660 +v in c1 x 2 5 1 2 7 4 fc c2 _ 2 cap+ cap- gnd 6 8 3 lv osc out sp6660 +v in c1 x n 5 1 2 7 4 fc c2 _ n cap+ cap- gnd 6 8 3 lv v out n 1 2 v out = -n x v in where v out = output voltage, v in = input voltage, and n = the total number of sp6660 devices connected. osc out sp6660 +v in c1 5 1 2 7 4 fc cap+ cap- gnd 6 8 3 lv osc out sp6660 +v in c1 _ 2 5 1 2 7 4 fc cap+ cap- gnd 6 8 3 lv osc out sp6660 +v in c1 _ n 5 1 2 7 4 fc c2 cap+ cap- gnd 6 8 3 lv r tot n 1 2 r tot = r out n where r tot = total resistance of the sp6660 devices connected in parallel, r out = the output resistance of a single sp6660 device, and n = the total number of sp6660 devices connected in parallel. figure 25. sp6660 devices cascaded to provide a multiple of a negative inverted output voltage figure 26. sp6660 devices connected in parallel to reduce output resistance
sp6660ds/11 sp6660 200ma charge pump inverter or doubler ? copyright 2000 sipex corporation 17 osc out sp6660 c1 5 1 2 7 4 fc c2 cap+ cap- gnd 6 8 3 lv c4 c3 v+ d1 d2 +v in v out1 = (2 x v in ) - v fd1 - v fd2 v out2 = -v in v out1 v out2 where v out1 = positive doubled output voltage, v in = input voltage, v fd1 = forward bias voltage across d1, v fd2 = forward bias voltage across d2, and v out2 = inverted output voltage. figure 27. the sp6660 connected for negative voltage conversion with positive supply multiplication circuit for negative voltage conversion with positive supply multiplication a designer can use the circuit in figure 27 to provide both an inverted output voltage at v out1 and a positive multiple of v in at v out2 (subtracting the forward biased voltages of d1 and d2). capacitor c1 is for the charge pump and capacitor c2 is for the reservoir function to generate the inverted output voltage at v out2 . capacitor c3 is for the charge pump and capacitor c4 is for the reservoir function to generate the multiplied positive output voltage at v out1 . designers should pay special attention to the possibility of higher source impedances at the generated supplies due to the finite impedance of the common charge pump driver.
sp6660ds/11 sp6660 200ma charge pump inverter or doubler ? copyright 2000 sipex corporation 18 60 70 80 90 100 1 10 100 1000 load current (ma) vin = 3.0v vin = 3.3v vin = 3.6v figure 28. the sp6660 and a ldo regulator connected as a 3v input to regulated 5v output converter. applications the sp6660 evaluation board provides a 3v to 5v 160ma dc to dc converter using the sp6660 doubler circuit and a 5v ldo regulator. v in gnd cap+ + c3 150 m f tant. c1 150 m f tant. + 1 2 3 4 fc cap+ gnd cap- sp6660 8 7 6 5 v+ osc lv out doubler d1 c2 150 m f tant. + v out gnd fc 1 2 3 v in gnd on/off_n lp2985 5 4 v out bypass c5 10nf cer. c4 4.7 m f cer. +5 gnd figure 29. ripple and noise output of the sp6660 and a ldo regulator with i load = 150ma v in = 3.2v v out 6660 = 5.53v v out ldo = 4.95v i load = 150ma 5vldo ripple figure 30. power efficiency vs input voltage - sp6660 doubler with 5v ldo figure 31. power efficiency vs load current - sp6660 doubler with 5v ldo g 60 70 80 90 100 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 input voltage (v) y( ) il = 150ma power efficiency (%) power efficiency (%) figure 32. ripple voltage vs input voltage - sp6660 doubler with 5v ldo ripple voltage (mv) sp6660 ripple 0 50 100 150 200 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 input voltage (v) 6660 ripple il = 150ma ldo ripple il = 150ma
sp6660ds/11 sp6660 200ma charge pump inverter or doubler ? copyright 2000 sipex corporation 19 d alternate end pins (both ends) d1 = 0.005" min. (0.127 min.) e package: plastic dual?n?ine (narrow) dimensions (inches) minimum/maximum (mm) a = 0.210" max. (5.334 max). e1 c l a2 a1 = 0.015" min. (0.381min.) b b1 e = 0.100 bsc (2.540 bsc) e a = 0.300 bsc (7.620 bsc) a2 b b1 c d e e1 l 0.115/0.195 (2.921/4.953) 0.014/0.022 (0.356/0.559) 0.045/0.070 (1.143/1.778) 0.008/0.014 (0.203/0.356) 0.735/0.775 (18.669/19.685) 0.300/0.325 (7.620/8.255) 0.240/0.280 (6.096/7.112) 0.115/0.150 (2.921/3.810) 0? 15 (0?15? 0.115/0.195 (2.921/4.953) 0.014/0.022 (0.356/0.559) 0.045/0.070 (1.143/1.778) 0.008/0.014 (0.203/0.356) 0.355/0.400 (9.017/10.160) 0.300/0.325 (7.620/8.255) 0.240/0.280 (6.096/7.112) 0.115/0.150 (2.921/3.810) 0? 15 (0?15? 22?in 8?in 14?in 16?in 0.115/0.195 (2.921/4.953) 0.014/0.022 (0.356/0.559) 0.045/0.070 (1.143/1.778) 0.008/0.014 (0.203/0.356) 1.145/1.155 (29.083/29.337) 0.300/0.325 (7.620/8.255) 0.240/0.280 (6.096/7.112) 0.115/0.150 (2.921/3.810) 0? 15 (0?15? 0.115/0.195 (2.921/4.953) 0.014/0.022 (0.356/0.559) 0.045/0.070 (1.143/1.778) 0.008/0.014 (0.203/0.356) 0.780/0.800 (19.812/20.320) 0.300/0.325 (7.620/8.255) 0.240/0.280 (6.096/7.112) 0.115/0.150 (2.921/3.810) 0? 15 (0?15? 18?in 0.115/0.195 (2.921/4.953) 0.014/0.022 (0.356/0.559) 0.045/0.070 (1.143/1.778) 0.008/0.014 (0.203/0.356) 0.880/0.920 (22.352/23.368) 0.300/0.325 (7.620/8.255) 0.240/0.280 (6.096/7.112) 0.115/0.150 (2.921/3.810) 0? 15 (0?15? 20?in 0.115/0.195 (2.921/4.953) 0.014/0.022 (0.356/0.559) 0.045/0.070 (1.143/1.778) 0.008/0.014 (0.203/0.356) 0.980/1.060 (24.892/26.924) 0.300/0.325 (7.620/8.255) 0.240/0.280 (6.096/7.112) 0.115/0.150 (2.921/3.810) 0? 15 (0?15?
sp6660ds/11 sp6660 200ma charge pump inverter or doubler ? copyright 2000 sipex corporation 20 d eh package: plastic small outline (soic) (narrow) dimensions (inches) minimum/maximum (mm) 8?in a a1 l b e h x 45 a a1 b d e e h h l 0.053/0.069 (1.346/1.748) 0.004/0.010 (0.102/0.249 0.014/0.019 (0.35/0.49) 0.189/0.197 (4.80/5.00) 0.150/0.157 (3.802/3.988) 0.050 bsc (1.270 bsc) 0.228/0.244 (5.801/6.198) 0.010/0.020 (0.254/0.498) 0.016/0.050 (0.406/1.270) 0?8 (0?8? 14?in 0.053/0.069 (1.346/1.748) 0.004/0.010 (0.102/0.249) 0.013/0.020 (0.330/0.508) 0.337/0.344 (8.552/8.748) 0.150/0.157 (3.802/3.988) 0.050 bsc (1.270 bsc) 0.228/0.244 (5.801/6.198) 0.010/0.020 (0.254/0.498) 0.016/0.050 (0.406/1.270) 0?8 (0?8? 16?in 0.053/0.069 (1.346/1.748) 0.004/0.010 (0.102/0.249) 0.013/0.020 (0.330/0.508) 0.386/0.394 (9.802/10.000) 0.150/0.157 (3.802/3.988) 0.050 bsc (1.270 bsc) 0.228/0.244 (5.801/6.198) 0.010/0.020 (0.254/0.498) 0.016/0.050 (0.406/1.270) 0?8 (0?8?
sp6660ds/11 sp6660 200ma charge pump inverter or doubler ? copyright 2000 sipex corporation 21 package: plastic micro small outline ( m soic) 1 0.013 0.005 0.0256 bsc 0.118 0.004 0.020 2 0.020 0.116 0.004 0.034 0.004 0.040 0.003 0.004 0.002 0.118 0.004 0.118 0.004 0.037 ref 0.0215 0.006 3.0? 3? r .003 12.0? 4? 0.006 0.006 0.006 0.006 0.008 0? - 6? 0.012 0.003 0.01 12.0? 4? 0.16 0.003 0.0965 0.003 0.116 0.004 50 m soic devices per tube all package dimensions in inches
sp6660ds/11 sp6660 200ma charge pump inverter or doubler ? copyright 2000 sipex corporation 22 ordering information model temperature range package type sp6660cp . ............................................. 0?c to +70?c .............................................. 8-pin pdip sp6660ep . ............................................ -40?c to +85?c ............................................ 8-pin pdip sp6660cn . ............................................. 0?c to +70?c ........................................... 8-pin nsoic sp6660en . ............................................ -40?c to +85?c ......................................... 8-pin nsoic sp6660cu . ............................................. 0?c to +70?c ........................................... 8-pin m soic sp6660eu . ............................................ -40?c to +85?c ......................................... 8-pin m soic sp6660eb .......................................................................................................... evaluation bo ard corporation signal processing excellence sipex corporation reserves the right to make changes to any products described herein. sipex does not assume any liability aris ing out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor t he rights of others. please consult the factory for pricing and availability on a tape-on-reel option. sipex corporation headquarters and sales office 22 linnell circle billerica, ma 01821 tel: (978) 667-8700 fax: (978) 670-9001 e-mail: sales@sipex.com sales office 233 south hillview drive milpitas, ca 95035 tel: (408) 934-7500 fax: (408) 935-7600

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