DC-DC Control Circuit for Single Inductor Dual Output DC-DC Converter with Charge Pump (AKM AKM Kenji TAKAHASHI Hajime YOKOO Shunsuke MIWA Hiroyuki IW

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1 DC-DC Control Circuit for Single Inductor Dual Output DC-DC Converter with Charge Pump (AKM AKM Kenji TAKAHASHI Hajime YOKOO Shunsuke MIWA Hiroyuki IWASE Nobukazu TAKAI Haruo KOBAYASHI Takahiro ODAGUCHI Shigeki TAKAYAMA Takeshi OMORI Isao NAKANISHI Kenji NEMOTO Jun-ichi MATSUDA Gunma University AKM Technology Corp. Asahi Kasei Power Devices Corp. 1 V op C out1 R 1 (Single Inductor Multi Output(SIMO))DC-DC [1]-[6] [6] [6] SIMO 0.18µm CMOS SPECTRE V in L I L C n C out2 1: DC- DC 2 2 DC-DC DC-DC [T 1:] [T 2:] [T 3:] I B [T 4:] R 2 V om

2 I L V op I B t Current Sensor L C n D C out1 R 1 V om r L T1 T4 V in C out2 R 2 T2 T5 T3 T6 2: 1 Logic CMP:Comparator EA:Error Amp FW:Free Wheel CMP CMP Ramp Generator ramp2 ramp1 FW Limit EA EA V refm T fwlimit V refp [T 5:] C n [T 6:] I B [T 1:] C n V op = T 1 T 2 V in T 2 (1) V om = T 4 T 5 V in V F T 5 (2) V F (1) (2) ramp1, ramp2 2 3: V ibref Voltage Detector r L Comparator 4: I B I B 4 r L I L V r = r L I L V ibref V ibref = I B r L V ibref V r I B V cs high V cs ESR [6] V CS

3 V DD xcircuit I t V SW1 FW SW2 C t V tref CMP V N V ct 5: ramp1 ramp2 V c1 V c2 V cmp FW limit 5 V F W high SW1 I t C t V ct V ct V tref V N high V F W low SW1 SW2 C t V ct 0V V N low V tref V ct = I t C t t (3) V tref = I t C t T fwlim (4) T fwlim ramp1 ramp2 ramp1 ramp2 7 7 [ 1:] D Q high Qb low C r1 C r2 Q high SW1, SW6, SW7, SW9, SW12 Qb D D low SW1 I c C r1 C r1 V c1 V c2 CMP2 high SW4 V cmp2 V N Q Qb 6: C r2 I 2 C r2 V c2 V c2 CMP2 low SW4 C 2 Vc2 [ 2:] C r1 V c1 CMP1 D C high D low Q low,qb high SW1, SW6, SW7, SW9, SW12 C r1 Qb D D high [ 3:] D Qb high SW2, SW5, SW8, SW10, SW11 SW5 CMP2 C r1 V c1 high SW3 high SW3 I 1 C r1 V c1 SW5 CMP2 C r1 low SW3 V c1 C r1 SW2 I c C r2 C r2 V c2 [ 4:]

4 I 1 V N CMP1 D Q C Qb D FlipFlop I C SW1 SW3 C r1 V c1 SW5 SW7 SW9 SW11 V ramp1 V DD SW2 V c2 SW6 SW8 SW10 SW12 V ramp2 CMP2 SW4 C r2 I 2 7: C r2 V c2 CMP1 D C high D D high Q high,qb low SW2, SW5, SW8, SW10, SW11 C r2 Qb D D low [ 5:] V N high V N 1 V N high OR D C high Q Qb 2 3 V N high OR D C high Q Qb 4 V N high [ ] C r1 C r2 C r1 SW7, SW9 C r1 ramp1 SW12 ramp2 C r2 SW8, SW10 C r2 ramp2 SW11 ramp1 6 2 V s = C r1,c r2 V cmp1 enap enam V cmp2 8: V cmp1 V cmp2 high enap hgih CLK enam high CLK V cs 2 [T1:] V cmp1 enap high [T2:] V cmp1 low [T3:] V cs high [T4:] enam high [T5:] V cmp2 low [T6:] T1 T6 1 V cs

5 9: 10: V op = 8VV om = 5V 1: V in 3.5V 500kHz L 2µH C out 10µF C n 2µF R 1, R 2 50Ω 10mΩ I L [A] SPECTRE 0.18µm CMOS PWM 7 4V, 1V 9 6 V N high 3 DC-DC 1 8V 5V 400ns 10 8V 5V kHz 2µs 400ns t[ms] 11: 12 FW limit 1µs 600ns 13 V op 14 V om DC- DC

6 I L [A] t[ms] 12: FW limit 13: V op V om I B 600ns [1] D.Ma,W-H Ki,C-Y Tsui, P.K.T. Mok, Single- Inductor Multiple-Output Switching Convert- ers with Time- Multiplexing Control in Dis- continuous Conduction Mode, IEEE Journal of Solid-state Circuit, Vol.38, No.1, pp , (Jan. 2003) [2] W-H.Ki,D.Ma, Single-Inductor Multiple-Output Switching Converter, IEEE PowerElec. Specialist Conf., Vancouver, Canada, pp , (June 2003) [3] S.C.Koon,Y.H.Lam,W.H.Ki, Integrated Charge- Control Single-Inductor Dual-Output Step-Up/Step- Down Converter, IEEE International Symposium on Circuit and Systems, pp , (May 2005) [4] W.Xu,X.Zhu,Z.Hong,D.Killat, Design of Single- Inductor Dual-Output Switching Con- verter with Average Current Mode Control, IEEE Asia Pacific Conference On Circuit and System (APCCAS), B4L-F2, Macao, (Dec. 2008) [5] S.Kim,G.A.Rincon-Mora, Single-Inductor Dual- Output Buck-Boost Fuel-Cell-Li-Ion Charging DC-DC Converter Supply, IEEE International Solid State Circuit Conference(ISSCC), (Feb. 2009) [6],,, 2 DC/DC,, ECT , pp.7-10,, ( ) [7] Young-Jin Woo, Hanh-Phue Le, Gyu-Ha Cho, Gyu- Hyeong Cho, Load-Independent Control of Switching DC-DC Converters With Freewheeling Current Feedback, IEEE Journal of Solid-State Circuits, VOL.43, NO.12, pp , (Dec. 2008) [8] Santhos A.Wibowo,,,,,,,,,, A Single-Inductor Dual-Output DC-DC Converter, 22, pp , (Apr 2009). [9] Z.Hu,D.Ma, A Pseudo-CCM Buck Converter with Freewheel Switching Control, IEEE International Symposium on Circuits and Systems(ISCAS), pp , (May 2005). [10] N. Takai and Y. Fujimura, Steep Down-Slope Sawtooth Wave Generator Utilizing Two Triangluar Waves Exclusively, IEICE Trans. Fundamentals of Electronics, Vol. E92-A, No.4 (April 2009) 14: V op V om

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