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www.siliconstandard.com 1 of 12 ss9175/6 dual synchronous dc/dc controllers with current sharing circuitry features description two sets of integrated mosfet drivers fixed operating frequency of 300, 600 or 1000khz dual-phase current-sharing controller to minimize ripple and improve transient response wide input supply range: 4.5v to 16v programmable output as low as 0.8v internal error amplifier reference voltage of 0.7v +/- 1% programmable over-current protection (ocp) with 50% fold - back over-voltage protection (ovp) soft-start remote on/off control high voltage pin up to 30v for bootstrap voltage power-good output signal provided current-sharing balance within +/-5% matching ( ss9175cs/ss9176cs) two independent pwm controllers (ss9175) packaged in so-20 (9175/cs) or so-16 (9176cs) the ss9175/6 series are dual-phase synchronous dc/dc pwm controllers for power supplies requiring a single high-current output, or two independent outputs with high conversion efficiency. the y integrate two sets of internal mosfet drivers consisting of high-side and low side driving circuits. the internal temperature - independent reference voltage is trimmed to 0.7v + / - 1%, and is connected to the error amplifier?s positive terminal for volta ge feedback regulation . the o ver - current p rotection (ocp) level, with 50% fold - back, can be programme d by an external resistor. the o ver - voltage p rotection (ovp) p oint is fixed at 25% higher above 0.7v. the soft - start circuit ensure s the duty cycle of the pwm output can be gradually and smoothly increased from zero to its desired value. the controllers can be remote ly turned on or off to enter into either active or standby mode, respectively. the ss9175/6 series provides three different options: the ss9175 is a 20-pin version that is designed for two independent output s withou t current sharing capability. the ss9175cs is a 20-pin version designed for current sharing application s . the ss9176cs is a 16-pin version for current sharing application s . applications n cpu and dsp vcore power supply n graphic c ards n telecomm and datacomm pol b oards n power s upp l ies r equi r ing two i ndependent o utputs 12v 1.4v 5v pwrg cl1+ cl1 - dh1 dl1 bst1 pgnd com vcc pwrg in1 cl2+ cl2 - dh2 dl2 bst2 bstc com ss/enb gnd in2 1uf 1uf 7.5uh 1k 7.5uh 1k 2.2pf 450uf 0.22uf 50k 50k 10uf typical application circuit re v . 2.02 12/29/2003 preliminary
www.siliconstandard.com 2 of 12 ss9175/6 ordering information ss917x xx-xx xx 20 1 uu: = ss9175 uu: cs = ss9175cs h : 3, 6 or 10 xxxxxxx: wafer lot yy: year; ww: week v: assembly location h : 3, 6 or 10 xxxxxxx: wafer lot yy: year; ww: week v: assembly location ss9175 uu - h xx xxxxxyywwv 16 1 ss9176cs - h xxxxxxxyywwv re v . 2.02 12/29/2003 p re l im ina r y packing: tr tape and reel: tb tubes fixed operating frequency: 3/6/10 for 300/600/1000khz configuration: cs = current sharing; blank = independent outputs (9175 only) part/package type: 9175 is in so-20; 9176 is in so-16 marking information examples: ss9176cs-10tr ss9176 with current-sharing outputs, 1000khz in so-16 on tape and reel ss9175-6tr ss9175 with independent outputs, 600khz in so-20 on tape and reel
www.siliconstandard.com 3 of 12 electrical characteristics (v cc =12v, t a =25c) oscillator section symbol parameter test condition min. typ. max. unit fosc - 3 oscillator frequency - 3 version ta=25c 270 300 330 khz fosc - 6 oscillator frequency - 6 version ta=25c 550 600 650 khz fosc - 10 oscillator frequency - 10 version ta=25c 920 1000 1080 khz fdv frequency change with vcc vcc=4.5 to 16v - 0.2 % fdt frequency change with temp. ta=0 to 70c - 0.02 - % / c dc max maximum duty cycle 85 95 % error amplifier section symbol parameter test condition min. typ. max. unit vref internal reference voltage ta=25c 0.693 0.7 0.707 v avol open - loop voltage gain - 45 55 - db bw unity gain bandwidth - 0.7 1.2 - mhz psrr power supply rejection ratio - 50 - - db isource output source current ma isink output sink current ma v h comp output voltage v v l comp output voltage mv output section symbol parameter test condition min. typ. max. unit tr rising time t a=25c, cl=10nf - 20 50 ns tf falling time t a=25c, cl=10nf - 20 50 ns i dh, ch high side source current 1 a i dh, dis high side sink current 1 a total operating current section symbol parameter test condition min. typ. max. unit i cc op operating supply current vcc=12v, output=1000pf - 5.0 ma i cc sby standby current (disabled) 0.5 ma ss9175/6 absolute maximum ratings recommended operating conditions sy m bol parameter test condition value unit vcc supply voltage, vcc to gnd low impedance source 20 v pgnd pgnd to gnd 0.7 v vbst bst to pgnd 30 v r t j - a thermal resistance, junction - air 90 c/w t j operating junction temperature - - 40 to +125 c t a operating ambient temperature - - 30 to +85 c tstg storage temperature range - - 65 to +150 c esd capability, hbm model 2 .0 kv esd capability, ma c hine model 200 v symbol parameter min. max. unit vcc supply voltage 4.5 16 v t a operating ambient temperature 0 70 c re v . 2.02 12/29/2003 p re l im ina r y
www.siliconstandard.com 4 of 12 ss9175/6 block diagrams ss9175 ss9175cs cl1+ bst2 bst1 pgnd cs cs osc ocp ocp osc d r q c in1 comp1 dh1 cl1 - dl1 cl2+ dh2 cl2 - dl2 bstc 25u ss/enb pwrgd gnd pwrgd vcc vdd gnd ldo ldo por bg osc180 d r q c cl1+ bst2 bst1 pgnd osc ocp ocp osc d r q c in1 in2 comp1 comp 2 dh1 cl1 - dl1 cl2+ dh2 cl2 - dl2 bstc 25u ss/enb pwrgd gnd pwrgd vcc vdd gnd ldo ldo por bg osc180 d r q c re v . 2.02 12/29/2003 p re l im ina r y
www.siliconstandard.com 5 of 12 ss9175/6 block diagrams (cont.) ss9176cs in comp ss/enb gnd vcc bst1 cl+ bst1 pgnd cs cs osc ocp ocp osc d r q c dh1 cl1 - dl1 dh2 cl2 - dl2 bstc 25u vdd gnd ldo ldo por bg osc180 d r q c pwrg d pwrgd re v . 2.02 12/29/2003 p re l im ina r y
www.siliconstandard.com 6 of 12 ss9175/6 pin descriptions pin no. symbol function des cription 1 (1) pwrgd power - good output of the e rror a mplifier and input to the pwm comparator. it is used for feedback loop compensation. 2 (2) in1 feedback inverting input of the error a mplifier. it is normally connected to the switching power supply ou tput through a resistor divider. 3 (3) comp1 compensation output of the e rror a mplifier and input to the pwm comparator. it is used for feedback loop compensation. 4 (4) vcc power supply supply voltage input. 5 cl1+ over - c urrent over - current adjustment and high - side mosfet supply voltage sense pin. connect a resistor from this pin to high - side supply voltage. 6 cl1 - over - c urrent over - current sense pin. 7 (5) bst1 boost supply supply for high - side driver. connect to bootstrap circuit. 8 (6) dh1 high - s ide d rive high - side mosfet gate driver pin. 9 (7) dl1 low - s ide d rive low - side mosfet gate driver pin. 10 (8) pgnd driver g round dri ver circuit gnd supply. connect to mosfet?s gnd. 11 (9) bstc buffered s upply voltage supply for internal low - side driver circuit and for high - side bootstrap circuit?s diode input. its output is 6v if chip supply voltage vcc > 6.5v. if vcc < 6.5v, then bstc = vcc. need a 10uf decoupling capacitor connect ed to pgnd. 12 (10) dl2 low - s ide d rive low - side mosfet gate driver pi n. 13 (11) dh2 high - s ide d rive high - side mosfet gate driver pin. 14 (12) bst2 boost supply supply for high - side driver. connect to bootstrap circuit. 15 (13) cl2 - over - c urrent over - current sense pin. 16 (14) cl2+ over - c urrent over - current adjustment a nd high - side mosfet supply voltage sense pin. connect a resistor from this pin to high - side supply voltage. 17 (15) ss/en soft - sta rt/enable a 25ua internal current source charge s an external capacitor for soft start. pull down this pin to disable the chip . 18 comp2 [nc] compensation output of the error a mplifier and input to the pwm comparator. it is used for feedback loop compensation. 19 in2 [nc] feedback inverting input of the e rror a mplifier. it is normally connected to the switching power supply out put through a resistor divider. 20 (16) gnd control g round control circuit gnd supply. note: inside ( ) is the pin assignment for ss9176cs. inside [ ] is for ss9175cs. pin configurations pwrgd pgnd dl1 dh1 bst1 cl1+ cl1 vcc comp1 in1 1 10 9 8 7 6 5 4 3 2 20 11 12 13 14 15 16 17 18 19 ss/enb in2 gnd bstc dl2 dh2 bst2 cl2- cl2+ comp2 ss/enb pgnd dl1 dh1 bst1 pwrgd vcc comp in gnd bstc dl2 dh2 bst2 cl2- cl+ 10 9 11 12 13 14 15 16 1 8 7 6 5 4 3 2 ss9175 ss9176 re v . 2.02 12/29/2003 p re l im ina r y
www.siliconstandard.com 7 of 12 ss9175/6 operation the ss9175/6 series controllers integrate two sets of synchronous mosfet driver circuits with current sharing capability. the following descriptions highlight the advantages of the ss917x designs. soft - s tart a 25ua start - up current is provided by the ss/en pin for the start - up sequence. d uring this start - up sequence, the ss917x is disabled when the ss/en pin is less than 1.0v. from 1.0v to 3.0v, pwm output duty cycle is gradually and smoothly increased to its desired value. during this time, the current sharing circuit is disabled for sm ooth soft start. after 3.0v, the current sharing circuit is enabled and the whole circuit o perate s normally. oscillator o peration the ss9175/6 series have three versions with different oscillation frequenc ies . the oscillation frequency is fixed at 300 k hz , 600 khz or 1 m hz. the voltage amplitude of the internal saw tooth oscillator is from 1.2v to 2.8v. error a mplifier the error amplifier?s i nverting input is connected to the in pin, and the output is connected to the comp pin. the comp output is available for external compensation, allowing designer s to control the feedback - loop frequency - response. non - inverting input is not wired out to a pin, but it is internally bias ed to a fixed 0.7v 1% voltage . over - current p rotection th e o ver - current p rotection (ocp) is implemented by adding a resistor from the mosfe t supply voltage to the cl+ pin, which sinks a 100ua current source. an internal comparator sense s the voltage difference between cl+ and cl - pin. if the cl - pin voltage is l ower than the cl+ pin voltage, mean ing there is a larger current flowing thr ough the high - side mosfet, the comparator will trigger the ocp protection. the ocp function also has a 50% fold - back circuit to limit the mosfet current within the desired over - cur rent value. output d river the high - side driver use s an external bootstrap circuit to provide the required boost supply voltage. the external bootstrap circuit u se s the bstc output voltage for providing the diode voltage. for the low - side driver, the supp ly voltage is coming from the bstc output voltage, which is roughly 6v if vcc is larger than 6.5v.the output stage is designed to ensure zero cross - conduction current. current sharing the dual - phase controller has current - sharing capability to ma tch both channels to within 5 %. application information re v . 2.02 12/29/2003 p re l im ina r y
www.siliconstandard.com 8 of 12 ss9175/6 reference circuits current sharing application using s s9176cs this current sharing circuit is implemented using the ss9176cs. the dual phase mosfets must be supplied from the same supply volta ge (in this case, from 12v). they can also be supplied from a 5v supply voltage. as there is only a single output voltage (1.4v in this case), the divided voltage is fed back to the in pin. the vcc supply voltage can be either 12v or 5v, depending on the convenience of pcb layou t, but vcc = 12v is recommended. if vcc > 6.5v, the bs tc output is fixed at 6v. this bstc voltage is used as the supply voltage for the bootstrap circuit?s diodes input. a 10uf capacitor is recommended for bstc decoupling. a 1k resistor is connected from c l2+ to the mosfet?s high - side voltage. this 1k resistor is used to program the ocp level. 1.4v pwrg 12v vcc dh1 dl1 bst1 pgnd in1 comp pwrgd cl2+ cl2 - dh2 dl2 bst2 bstc ss/enb gnd 1uf 1k 1uf 7.5uh 4 50uf 50k 50k 7.5uh 10uf 0.22uf 2.2pf application information (cont.) re v . 2.02 12/29/2003 p re l im ina r y
www.siliconstandard.com 9 of 12 ss9175/6 current sharing application using s s9175cs this current - sharing circuit is implemented using ss9175cs. the dual phase mosfets can be supplied from different supply voltages (in this case, from 12v for chan nel 2, and 5v for channel 1). they can be supplied from the same supply voltage, too. as there is only a single output voltage (1.4v in this c ase), the divided voltage is fe d back to the in1 pin. the vcc su pply voltage can be either 12v or 5v, depending on the con venience of pcb layout, but vcc = 12v is recommended. if vcc > 6.5v, the bs tc output is fixed at 6v. this bstc voltage is used as the supply voltage for the bootstrap circuit?s diodes input. a 10uf capacitor is recommended for bstc decoupling. a 1k resistor is connected from cl2+ to the mosfet?s high - side voltage. this 1k resistor is used to program the ocp level. 12v 1.4v 5v pwrg cl1+ cl1 - dh1 dl1 bst1 pgnd comp1 vcc pwrgd in1 cl2+ cl2 - dh2 dl2 bst2 bstc comp2 ss/enb gnd in2 1uf 1uf 7.5uh 1k 7.5uh 1k 2.2pf 450uf 0.22uf 50k 50k 10uf application information (cont.) re v . 2.02 12/29/2003 p re l im ina r y
www.siliconstandard.com 10 of 12 ss9175/6 two independent voltage output s using ss9175 for independent outputs, this design is implemented using ss9175. the dual-phase mosfets can be supplied from different supply voltage s (in this case, from 12v for cha nnel 2, and 5v for channel 1). they can be supplied from the same supply voltage, too. as there are two independent output vo ltages (2.1v and 1.4v in this cas e), the divided voltages are fe d back to their respective in1 and in2 pin s . the vcc supply voltage can be either 12v or 5v, depending on the conv enience of pcb layout, but vcc = 12v is recommended. if vcc > 6.5v, the bstc o utput is fixed at 6v. this bstc voltage is used as the supply voltage for the bootstrap circuit?s diodes input. a 10uf capacitor is recommended for bstc decoupling. a 1k resistor is conne cted from cl1+ and cl2+ to the mosfet?s high - side voltages. this 1k r esistor is used to program the ocp level. 12v 5v pwrg cl1+ cl1 - dh1 dl1 bst1 pgnd comp1 vcc pwrgd in1 c l2+ cl2 - dh2 dl2 bst2 bstc comp2 ss/enb gnd in2 10uf 1k 7.5uh 7.5uh 50k 450uf 25k 50k 50k 2.1v 1uf 1uf 0.22uf 1k 2.2pf 2.2pf 450uf n application information (cont.) re v . 2.02 12/29/2003 p re l im ina r y
www.siliconstandard.com 11 of 12 ss9175/6 physical dimensions 20 lead sop (unit: inches) dimensions: re v . 2.02 12/29/2003 p re l im ina r y
www.siliconstandard.com 12 of 12 ss9175/6 in formation furnished by silicon standard corporation is believe d to be accurate and reliable. however, silicon standard corporation makes no guarantee or warranty, express or implied, as to the reliability, accuracy, timeliness or completeness of such information and assumes no responsibility for its use, or for infri ngement of any patent or other intellectual property rights of third parties that may result from its use. silicon standard reserves the right to make changes as it deems necessary to any products described herein for any reason, including without limitat ion enhancement in reliability, functionality or design. no license is granted, whether expressly or by implication, in relation to the use of any products described herein or to the use of any information provided herein, under any patent or other intelle ctual property rights of silicon standard corporation or any third parties. dimensions: physical dimensions (cont.) 16 lead sop (units: inches) re v . 2.02 12/29/2003 p re l im ina r y

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