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1 dc1780aafa demo manual dc1780a-a description LTM4620EV: high efficiency, polyphase 50a step-down power module ? regulator demonstration circuit 1780a-a features polyphase ? design using the ltm ? 4620ev, the high efficiency, high density, dual 13a, switch mode step-down power module regulator. the input voltage is from 4.5v to 16v. the output voltage is jumper selectable from 1.0v to 2.5v. dc1780a-a can deliver nominal 50a output current with 2 ltm4620s in parallel. as explained in the data sheet, output current derating is necessary for certain v in , v out , and thermal conditions. the ltm4620 on dc1780a-a always operate in continuous conduction mode. the switching frequency can be programmed through a resistor or can be synchronized to an external clock signal. the board allows the user to program how its output voltage ramps up and down through the track_control pin. the output voltage is tightly regulated between v out + and v out C through remote output voltage sensing which improves output voltage regulation at heavy loads. these features and the availability of the LTM4620EV in a compact 15mm 15mm 4.41mm lga package make it ideal for use in many high-density point-of-load regulation applications. the ltm4620 data sheet must be read in conjunction with this demo manual prior to working on or modifying the demo circuit dc1780a-a. design files for this circuit board are available at http://www.linear.com/demo l , lt, ltc, ltm, linear technology, the linear logo, module and polyphase are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. figure 1. 50a polyphase ltm4620/dc1780a-a demo board
2 dc1780aafa demo manual dc1780a-a quick start procedure demonstration circuit dc1780a-a is easy to set up to evaluate the performance of polyphase operation of the LTM4620EV. due to the high input/output current, select a proper input supply/load/cable which can sustain the full load operation. please refer to figure 2 for proper measurement setup and follow the procedure below: 1. place jumpers in the following positions for a typical 1.0v out application: jp1 jp2 jp4-jp8 clk run v out select int_clk off on jp4/1.0v 2. with power off, connect the input power supply, load and meters as shown in figure 2. preset the load to 0a and v in supply to 12v. 3. turn on the power supply at the input. place jp2 to on position. the output voltage between v out + and v out C should be 1.0v 1.5% (0.985v to 1.015v). 4. once the proper output voltage is established, adjust the load within the operating range and observe the output voltage regulation, output voltage ripple, efficiency and other parameters. output voltage ripple should be measured at j7 with bnc cables. 50 termination should be set on the oscilloscope or bnc cables. 5. (optional) for optional load transient test, apply an adjustable pulse signal between iostep clk and gnd test point. the pulse amplitude (3v to 3.5v) sets the load step current amplitude. the output transient current can be monitored at the bnc connector j8 (5mv/a). the pulse signal should be very small duty cycle (< 10%) to limit the thermal stress on the transient load circuit. performance summary specifications are at t a = 25c parameter conditions/notes value input voltage range 4.5v to 16v output voltage v out v in = 4.5v to 16v, i out = 0a to 50a, jp4: 1.0v 1.0v 1.5% (0.985v to 1.015v) maximum continuous output current derating is necessary for certain v in , v out and thermal conditions, see data sheet for detail. 50a default operating frequency 500khz resistor programmable frequency range 400khz to 780khz external clock sync. frequency range 400khz to 780khz efficiency v in = 12v, v out = 1.0v, i out = 50a, f sw = 500khz 82.4% see figure 4 load transient v in = 12v, v out = 1.0v, i setp = 25a to 50a <138mv, see figure 5 output voltage ripple v in = 12v, v out = 1.0v, i out = 50a <10mv, see figure 6 table 1. ltm4620 demo cards for up to 100a point-of-load regulation maximum output current number of output voltages number of ltm4620 module regulators on the board demo card number 13a, 13a 2 1 dc1498a 50a 1 2 dc1780a-a 75a 1 3 dc1780a-b 100a 1 4 dc1780a-c
3 dc1780aafa demo manual dc1780a-a figure 2. test setup of dc1780a-a * note: the output current is measured with a mv-voltage meter across a 1% accurate shunt resistor. quick start procedure * 6. (optional) ltm4620 can be synchronized to an external clock signal. place the jp1 jumper on ext_clk and apply a clock signal (0v to 5v, square wave) on the ext_clk test point. 7. (optional) the outputs of ltm4620 can track another supply. the output voltage tracks the voltage on track_control when a valid signal is applied on the test point. 8. (optional) dc1780a-a can be configured to a dual outputs configuration with v out at 37a load current and v out2 at 13a load current. stuff 0 resistor on r61 and 0.1f on c14. remove r22, r23, r24, r26, r27, r28, r32, r33, r35. output voltage v out2 is set by r37 based on the equation v out2 = 0.6v(1 + 60.4k/ r37).
4 dc1780aafa demo manual dc1780a-a quick start procedure figure 3. measured efficiency v in = 5v, f sw = 500khz figure 4. measured efficiency v in = 12v, f sw = 500khz load current (a) 0 efficiency (%) 100 90 80 70 60 40 10 dc1780a-a f03 50 30 20 v in = 5v, v out = 2.5v v in = 5v, v out = 1.8v v in = 5v, v out = 1.5v v in = 5v, v out = 1.2v v in = 5v, v out = 1v load current (a) 0 efficiency (%) 100 90 80 70 60 40 10 dc1780a-a f04 50 30 20 v in = 12v, v out = 2.5v v in = 12v, v out = 1.8v v in = 12v, v out = 1.5v v in = 12v, v out = 1.2v v in = 12v, v out = 1v figure 5. load transient 25a to 50a (v in = 12v, v out = 1v) figure 6. measured output voltage ripple at 12v in , 1v out , 50a on j7 with standard demo circuit default setup dc1780a-a f05 1v output (20mhz bw) 100mv/div 25a to 50a load dc1780a-a f06 1v output (20mhz bw) 10mv/div
5 dc1780aafa demo manual dc1780a-a figure 7. thermal capture at 12v in , 1.0v out at 50a (ambient temperature = 23.3c, no airflow and no heat sink) figure 8, thermal capture at 12v in , 1.0v out at 50a (ambient temperature = 23.3c, 200lfm airflow and no heat sink) quick start procedure
6 dc1780aafa demo manual dc1780a-a parts list item qty reference part description manufacturer/part number required circuit components 1 8 cin3, cin4, cin5, cin6, cin7, cin8, cin9, cin10 cap., x5r 22f 25v 10% 1210 murata grm32er61226ke15 2 4 cout1, cout7, cout11, cout15, cap., x5r 100f 10v 20% 1210 taiyo yuden lmk325bj107mn-t 3 4 cout4, cout10, cout12, cout19 cap., poscap 470f 4v 20% 7343 sanyo 4tpe470mcl 4 1 r14 res., chip 90.9k 0.06w 1% 0603 vishay crcw060390k9fkea 5 2 r9, r31 res., chip 121k 0.06w 1% 0603 vishay crcw0603121kfkea 6 2 r1, r3 res., chip 10 0.06w 5% 0603 vishay crcw060310r0jnea 7 2 c4, c10 cap., x5r 2.2f 10v 20% 0603 taiyo yuden lmk107bj225ma 8 1 c7 cap., x7r 0.1f 25v 10% 0603 avx 06033c104kat2a 9 2 u1, u2 i.c., volt. reg. lga(144) 15mmx15mmx4.41mm(1873-rev0) linear technology corp. LTM4620EV additional demo board circuit components 10 1 c25 cap., x7r 0.1f 25v 10% 0603 avx 06033c104kat2a 11 2 cout5, cout18, cout24, cout38 cap., x5r 100f 10v 20% 1210 taiyo yuden lmk325bj107mn-t 12 2 cout6, cout25 cap., poscap 470f 4v 20% 7343 sanyo 4tpe470mcl 13 1 r15 res., chip 60.4k 0.06w 1% 0603 vishay crcw060360k4fkea 14 1 r16 res., chip 40.2k 0.06w 1% 0603 vishay crcw060340k2fkea 15 1 r17 res., chip 30.1k 0.06w 1% 0603 vishay crcw060330k1fkea 16 1 r18 res., chip 19.1k 0.06w 1% 0603 vishay crcw060319k1fkea 17 6 r2, r21, r39, r43, r47, r51 res., chip 121k 0.06w 1% 0603 vishay crcw0603121kfkea 18 2 r25, r29 res., chip 10 0.06w 5% 0603 vishay crcw060310r0jnea 19 2 c18, c22 cap., x5r 2.2f 10v 20% 0603 taiyo yuden lmk107bj225ma 20 1 cin1 cap., alum 150f 25v 25% suncon-8 suncon 25ce150ax 21 2 cin2, cin11 cap., x5r 1f 25v 10% 1210 taiyo yuden tmk325bj105km 22 4 r22, r23, r24, r26 res., 0 2010 tepro(nakoma) rnh6083 23 2 r56, r57 res., 0.010 2w 1% 2512 vishay wsl-2512-r01000-f-ea 24 0 r58, r59 (opt) res., 2512 25 1 r60 res/jumper, chip 0 1/4w 1a 1206 vishay crcw12060000zoea 26 4 r4, r36, r41, r54 res., chip 10k 0.06w 5% 0603 vishay crcw060310k0jnea 27 0 r5, r7, r8, r10, r13, r30, r34, r37, r38, r42, r44, r48, r49, r50, r52, r53, r55, r61 (opt) res., 0603 28 13 r6, r19, r20, r27, r28, r32, r33, r35, r40, r45, r46, r62, r63, res/jumper, chip 0 1/16w 1a 0603 vishay crcw06030000z0ea 29 0 cout23, cout29, cout31, cout37 (opt) cap., d case 7343 30 0 c1, c2, c3, c5, c8, c9, c12, c13, c14, c15, c16, c17, c20, c21, c26, c29, c30 (opt) cap., 0603 31 6 c6, c11, c19, c23, c27, c28 cap., x7r 1f 10v 10% 0603 taiyo yuden lmk107bj105ka 32 1 c24 cap., x7r 0.01f 100v 10% 0603 avx 06031c103kat2a 33 2 q1, q2 mosfet n-channel, 30v dpak(to-252) vishay siliconix sud50n03-09p
7 dc1780aafa demo manual dc1780a-a parts list item qty reference part description manufacturer/part number 34 0 cout2, cout3, cout8, cout9, cin12, cout13, cin13, cout14, cin14, cin15, cout16, cin16, cout17, cin17, cin18, cin19, cout20, cout21, cout22, cout26, cout27, cout28, cout30, cout32, cout33, cout34, cout35, cout36 (opt) cap., 1210 hardware for demo board only 35 3 xjp1, xjp2, xjp4 shunt, 2mm ctrs. samtec 2sn-bk-g 36 4 mh1-mh4 stand-off, nylon 0.5" tall keystone, 8833 (snap on) 37 2 j7, j8 bnc connector connex 112404 38 2 jp1, jp2 headers, 3 pins 2mm ctrs. samtec tmm-103-02-l-s 39 5 jp4, jp5, jp6, jp7, jp8 jumper, 2 pins 2mm ctrs. samtec tmm-102-02-l-s 40 6 j1, j2, j3, j4, j5, j6 stud, test pin pem kfh-032-10 41 11 e1, e2, e3, e4, e6, e7, e8, e9, e12, e13, e22 turret, test point mill max 2308-2-00-80-00-00-07-0 42 0 e5, e10, e11, e14, e15, e16, e17, e18 (opt) test point 43 2 e19, e20 turret, test point mill max 2501-2-00-80-00-00-07-0 44 12 nut, brass nuts #10-32 any, #10-32 45 6 ring, lug ring # 10 keystone, 8205 46 6 washer, #10, tin plated brass any, #10 ext bz tn
8 dc1780aafa demo manual dc1780a-a schematic diagram 5 5 4 4 3 3 2 2 1 1 d d c c b b a a vout select ekdwhe>^^kd,zt/^^w/&/x x>>z^/^dkz^?x ?x>>w/dkz^?x 50a vfb pgood comp run track vout vfb pgood comp run track diffp diffn vfb pgood comp clkout_u1 run track vfb vin intvcc_u1 intvcc_u1 vout vo+ vo- vo+ intvcc_u1 vin vo+ vo- vout extvcc revision history description date approved eco rev -())= 352'8&7,21 revision history description date approved eco rev -())= 352'8&7,21 revision history description date approved eco rev -())= 352'8&7,21 size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology )d[ 0loslwdv&$ 3krqh 0f&duwk\%oyg /7&&21),'(17,$/)25&86720(586(21/< customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.li near.com 1 '(02&,5&8,7$$ 0rqgd\'hfhpehu 1 4 +,*+()),&,(1&<32/<3+$6( 1$ /70(9 5% jeff z. 67(3'2:132:(502'8/(5(*8/$725 c:\pads projects\1780a\sch\1780a-a\1780a-a_00_rev1.dsn size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology )d[ 0loslwdv&$ 3krqh 0f&duwk\%oyg /7&&21),'(17,$/)25&86720(586(21/< customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.li near.com 1 '(02&,5&8,7$$ 0rqgd\'hfhpehu 1 4 +,*+()),&,(1&<32/<3+$6( 1$ /70(9 5% jeff z. 67(3'2:132:(502'8/(5(*8/$725 c:\pads projects\1780a\sch\1780a-a\1780a-a_00_rev1.dsn size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology )d[ 0loslwdv&$ 3krqh 0f&duwk\%oyg /7&&21),'(17,$/)25&86720(586(21/< customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.li near.com 1 '(02&,5&8,7$$ 0rqgd\'hfhpehu 1 4 +,*+()),&,(1&<32/<3+$6( 1$ /70(9 5% jeff z. 67(3'2:132:(502'8/(5(*8/$725 c:\pads projects\1780a\sch\1780a-a\1780a-a_00_rev1.dsn cout7 100uf 10v 1210 cout7 100uf 10v 1210 e9 track_control e9 track_control r16 40.2k 1% r16 40.2k 1% e8 extvcc e8 extvcc jp8 2.5v jp8 2.5v cin5 22uf 25v 1210 cin5 22uf 25v 1210 jp2 on off run jp2 on off run 1 3 2 e1 ext_clk e1 ext_clk r6 0 ohm r6 0 ohm + cout6 470uf 4v 7343 + cout6 470uf 4v 7343 c6 1uf 10v c6 1uf 10v c1 (opt) c1 (opt) c7 0.1uf c7 0.1uf cout5 100uf 10v 1210 cout5 100uf 10v 1210 jp4 1.0v jp4 1.0v cin6 22uf 25v 1210 cin6 22uf 25v 1210 r4 10k r4 10k + cout4 470uf 4v 7343 + cout4 470uf 4v 7343 c4 2.2uf 10v c4 2.2uf 10v + cin1 150uf 25v + cin1 150uf 25v r7 (opt) r7 (opt) r2 121k 1% r2 121k 1% c2 (opt) c2 (opt) jp7 1.8v jp7 1.8v r9 121k 1% r9 121k 1% r3 10 r3 10 cout2 (opt) 1210 cout2 (opt) 1210 r5 (opt) r5 (opt) e4 vin- e4 vin- e6 vo- e6 vo- e2 vo+ e2 vo+ r15 60.4k 1% r15 60.4k 1% r14 90.9k 1% r14 90.9k 1% r13 (opt) r13 (opt) cout3 (opt) 1210 cout3 (opt) 1210 e22 sgnd e22 sgnd j2 0.6 - 2.5v vout j2 0.6 - 2.5v vout e10 sw2-1 e10 sw2-1 e5 sw1-1 e5 sw1-1 r17 30.1k 1% r17 30.1k 1% jp6 1.5v jp6 1.5v r62 0 ohm r62 0 ohm + cout10 470uf 4v + cout10 470uf 4v cin2 1uf 25v 1210 cin2 1uf 25v 1210 u1 LTM4620EV u1 LTM4620EV vout1 a1 vout1 a2 vout1 a3 vout1 a4 vout1 a5 vout1 b1 vout1 b2 vout1 b3 vout1 b4 vout1 b5 vout1 c1 vout1 c2 vout1 c3 vout1 c4 vfb1 d5 sw1 g2 pgood1 g9 comp1 e6 run1 f5 track1 e5 vout1s c5 vout2 a8 vout2 a9 vout2 a10 vout2 a11 vout2 a12 vout2 b8 vout2 b9 vout2 b10 vout2 b11 vout2 b12 vout2 c9 vout2 c10 vout2 c11 vout2 c12 vfb2 d7 sw2 g11 pgood2 g8 comp2 e7 run2 f9 track2 d8 vout2s c8 vin m2 vin m3 vin m4 vin m5 vin m6 vin m7 vin m8 vin m9 vin m10 vin m11 vin l2 vin l3 vin l4 vin l5 vin l6 vin l7 vin l8 vin l9 vin l10 vin l11 vin k2 vin k3 vin k4 vin k9 vin k10 vin k11 vin j2 vin j3 vin j4 vin j9 vin j10 vin j11 gnd a6 gnd a7 gnd b6 gnd b7 gnd d1 gnd d2 gnd d3 gnd d4 gnd d9 gnd d10 gnd d11 gnd d12 gnd e1 gnd e2 gnd e3 gnd e4 gnd e10 gnd e11 gnd e12 gnd f1 gnd f2 gnd f3 gnd f10 gnd f11 gnd f12 gnd g1 gnd g3 gnd g10 gnd g12 gnd h1 gnd h2 gnd h3 gnd h4 gnd h5 gnd h6 gnd h7 gnd h9 gnd h10 gnd h11 gnd h12 gnd m12 gnd m1 gnd l12 gnd j1 gnd j5 gnd j8 gnd j12 gnd k1 gnd k5 gnd k6 gnd k7 gnd k8 gnd k12 gnd l1 sgnd c7 sgnd d6 sgnd f6 sgnd f7 sgnd g6 sgnd g7 fset c6 phasmd g4 diffp e8 diffn e9 clkout g5 mode-pllin f4 temp j6 intvcc h8 extvcc j7 diffout f8 cout8 (opt) 1210 cout8 (opt) 1210 r10 (opt) r10 (opt) e3 vin+ e3 vin+ j4 gnd j4 gnd cout9 (opt) 1210 cout9 (opt) 1210 r60 0 ohm 1206 r60 0 ohm 1206 r63 0 ohm r63 0 ohm e7 pgood e7 pgood r8 (opt) r8 (opt) c5 (opt) c5 (opt) j3 gnd j3 gnd r18 19.1k 1% r18 19.1k 1% jp5 1.2v jp5 1.2v jp1 ext_clk int_clk clk jp1 ext_clk int_clk clk 1 3 2 cout1 100uf 10v 1210 cout1 100uf 10v 1210 c3 (opt) c3 (opt) cin4 22uf 25v 1210 cin4 22uf 25v 1210 r1 10 r1 10 cin3 22uf 25v 1210 cin3 22uf 25v 1210 j1 4.5v - 16v vin j1 4.5v - 16v vin
9 dc1780aafa demo manual dc1780a-a schematic diagram 5 5 4 4 3 3 2 2 1 1 d d c c b b a a do not stuff 0 ohm jumpers for separate vout2_u2. comp_u2 run_u2 comp track_u2 vfb pgood run track pgood_u2 diffout_u2 diffout_u2 vfb_u2 pgood_u2 vfb_u2 run_u2 comp_u2 track_u2 comp clkout_u1 clkout_u2 run track pgood vfb vout intvcc_u2 vout2_u2 vin extvcc intvcc_u2 vo2+ vo2- vo2+ vo2- intvcc_u2 vo2+ vout2_u2 vout vout2_u2 size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology )d[ 0loslwdv&$ 3krqh 0f&duwk\%oyg /7&&21),'(17,$/)25&86720(586(21/< customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.li near.com 1 '(02&,5&8,7$$ )ulgd\'hfhpehu 2 4 +,*+()),&,(1&<32/<3+$6( 1$ /70(9 5% jeff z. 67(3'2:132:(502'8/(5(*8/$725 c:\pads projects\1780a\sch\1780a-a\1780a-a_00_rev1.dsn size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology )d[ 0loslwdv&$ 3krqh 0f&duwk\%oyg /7&&21),'(17,$/)25&86720(586(21/< customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.li near.com 1 '(02&,5&8,7$$ )ulgd\'hfhpehu 2 4 +,*+()),&,(1&<32/<3+$6( 1$ /70(9 5% jeff z. 67(3'2:132:(502'8/(5(*8/$725 c:\pads projects\1780a\sch\1780a-a\1780a-a_00_rev1.dsn size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology )d[ 0loslwdv&$ 3krqh 0f&duwk\%oyg /7&&21),'(17,$/)25&86720(586(21/< customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.li near.com 1 '(02&,5&8,7$$ )ulgd\'hfhpehu 2 4 +,*+()),&,(1&<32/<3+$6( 1$ /70(9 5% jeff z. 67(3'2:132:(502'8/(5(*8/$725 c:\pads projects\1780a\sch\1780a-a\1780a-a_00_rev1.dsn r29 10 r29 10 c11 1uf 10v c11 1uf 10v r23 0 ohm 2010 r23 0 ohm 2010 r38 (opt) r38 (opt) r19 0 ohm r19 0 ohm c8 (opt) c8 (opt) u2 LTM4620EV u2 LTM4620EV vout1 a1 vout1 a2 vout1 a3 vout1 a4 vout1 a5 vout1 b1 vout1 b2 vout1 b3 vout1 b4 vout1 b5 vout1 c1 vout1 c2 vout1 c3 vout1 c4 vfb1 d5 sw1 g2 pgood1 g9 comp1 e6 run1 f5 track1 e5 vout1s c5 vout2 a8 vout2 a9 vout2 a10 vout2 a11 vout2 a12 vout2 b8 vout2 b9 vout2 b10 vout2 b11 vout2 b12 vout2 c9 vout2 c10 vout2 c11 vout2 c12 vfb2 d7 sw2 g11 pgood2 g8 comp2 e7 run2 f9 track2 d8 vout2s c8 vin m2 vin m3 vin m4 vin m5 vin m6 vin m7 vin m8 vin m9 vin m10 vin m11 vin l2 vin l3 vin l4 vin l5 vin l6 vin l7 vin l8 vin l9 vin l10 vin l11 vin k2 vin k3 vin k4 vin k9 vin k10 vin k11 vin j2 vin j3 vin j4 vin j9 vin j10 vin j11 gnd a6 gnd a7 gnd b6 gnd b7 gnd d1 gnd d2 gnd d3 gnd d4 gnd d9 gnd d10 gnd d11 gnd d12 gnd e1 gnd e2 gnd e3 gnd e4 gnd e10 gnd e11 gnd e12 gnd f1 gnd f2 gnd f3 gnd f10 gnd f11 gnd f12 gnd g1 gnd g3 gnd g10 gnd g12 gnd h1 gnd h2 gnd h3 gnd h4 gnd h5 gnd h6 gnd h7 gnd h9 gnd h10 gnd h11 gnd h12 gnd m12 gnd m1 gnd l12 gnd j1 gnd j5 gnd j8 gnd j12 gnd k1 gnd k5 gnd k6 gnd k7 gnd k8 gnd k12 gnd l1 sgnd c7 sgnd d6 sgnd f6 sgnd f7 sgnd g6 sgnd g7 fset c6 phasmd g4 diffp e8 diffn e9 clkout g5 mode-pllin f4 temp j6 intvcc h8 extvcc j7 diffout f8 r28 0 ohm r28 0 ohm c10 2.2uf 10v c10 2.2uf 10v + cout12 470uf 4v 7343 + cout12 470uf 4v 7343 e13 vo2- e13 vo2- e11 sw1-2 e11 sw1-2 r21 121k 1% r21 121k 1% cout17 (opt) 1210 cout17 (opt) 1210 cin10 22uf 25v 1210 cin10 22uf 25v 1210 r20 0 ohm r20 0 ohm r22 0 ohm 2010 r22 0 ohm 2010 r24 0 ohm 2010 r24 0 ohm 2010 e14 sw2-2 e14 sw2-2 + cout25 470uf 4v 7343 + cout25 470uf 4v 7343 r31 121k 1% r31 121k 1% j5 vout2_u2 vout/ j5 vout2_u2 vout/ cin9 22uf 25v 1210 cin9 22uf 25v 1210 cout16 (opt) 1210 cout16 (opt) 1210 r30 (opt) r30 (opt) r26 0 ohm 2010 r26 0 ohm 2010 c14 (opt) c14 (opt) cout15 100uf 10v 1210 cout15 100uf 10v 1210 + cout19 470uf 4v 7343 + cout19 470uf 4v 7343 c12 (opt) c12 (opt) c9 (opt) c9 (opt) e12 vo2+ e12 vo2+ r36 10k r36 10k r35 0 ohm r35 0 ohm r34 (opt) r34 (opt) cin7 22uf 25v 1210 cin7 22uf 25v 1210 cout38 100uf 10v 1210 cout38 100uf 10v 1210 j6 gnd j6 gnd r61 (opt) r61 (opt) r27 0 ohm r27 0 ohm r33 0 ohm r33 0 ohm c15 (opt) c15 (opt) cout11 100uf 10v 1210 cout11 100uf 10v 1210 cout18 100uf 10v 1210 cout18 100uf 10v 1210 r37 (opt) r37 (opt) c13 (opt) c13 (opt) cout13 (opt) 1210 cout13 (opt) 1210 cin8 22uf 25v 1210 cin8 22uf 25v 1210 r25 10 r25 10 cout14 (opt) 1210 cout14 (opt) 1210 r32 0 ohm r32 0 ohm
10 dc1780aafa demo manual dc1780a-a schematic diagram 5 5 4 4 3 3 2 2 1 1 d d c c b b a a comp run comp clkout_u2 clkout_u3 vfb pgood run vfb track pgood track comp clkout_u2 clkout_u3 run vfb pgood track vout intvcc_u3 vout vin extvcc intvcc_u3 intvcc_u3 intvcc_u3 size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology )d[ 0loslwdv&$ 3krqh 0f&duwk\%oyg /7&&21),'(17,$/)25&86720(586(21/< customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.li near.com 1 '(02&,5&8,7$$ 0rqgd\'hfhpehu 3 4 +,*+()),&,(1&<32/<3+$6( 1$ /70(9 5% jeff z. 67(3'2:132:(502'8/(5(*8/$725 c:\pads projects\1780a\sch\1780a-a\1780a-a_00_rev1.dsn size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology )d[ 0loslwdv&$ 3krqh 0f&duwk\%oyg /7&&21),'(17,$/)25&86720(586(21/< customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.li near.com 1 '(02&,5&8,7$$ 0rqgd\'hfhpehu 3 4 +,*+()),&,(1&<32/<3+$6( 1$ /70(9 5% jeff z. 67(3'2:132:(502'8/(5(*8/$725 c:\pads projects\1780a\sch\1780a-a\1780a-a_00_rev1.dsn size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology )d[ 0loslwdv&$ 3krqh 0f&duwk\%oyg /7&&21),'(17,$/)25&86720(586(21/< customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.li near.com 1 '(02&,5&8,7$$ 0rqgd\'hfhpehu 3 4 +,*+()),&,(1&<32/<3+$6( 1$ /70(9 5% jeff z. 67(3'2:132:(502'8/(5(*8/$725 c:\pads projects\1780a\sch\1780a-a\1780a-a_00_rev1.dsn c16 (opt) c16 (opt) cin15 (opt) 1210 cin15 (opt) 1210 + cout23 (opt) 7343 + cout23 (opt) 7343 cout27 (opt) 1210 cout27 (opt) 1210 cout28 (opt) 1210 cout28 (opt) 1210 c19 1uf 10v c19 1uf 10v c17 (opt) c17 (opt) e15 sw1-3 e15 sw1-3 cin14 (opt) 1210 cin14 (opt) 1210 cin12 (opt) 1210 cin12 (opt) 1210 u3 (opt) u3 (opt) vout1 a1 vout1 a2 vout1 a3 vout1 a4 vout1 a5 vout1 b1 vout1 b2 vout1 b3 vout1 b4 vout1 b5 vout1 c1 vout1 c2 vout1 c3 vout1 c4 vfb1 d5 sw1 g2 pgood1 g9 comp1 e6 run1 f5 track1 e5 vout1s c5 vout2 a8 vout2 a9 vout2 a10 vout2 a11 vout2 a12 vout2 b8 vout2 b9 vout2 b10 vout2 b11 vout2 b12 vout2 c9 vout2 c10 vout2 c11 vout2 c12 vfb2 d7 sw2 g11 pgood2 g8 comp2 e7 run2 f9 track2 d8 vout2s c8 vin m2 vin m3 vin m4 vin m5 vin m6 vin m7 vin m8 vin m9 vin m10 vin m11 vin l2 vin l3 vin l4 vin l5 vin l6 vin l7 vin l8 vin l9 vin l10 vin l11 vin k2 vin k3 vin k4 vin k9 vin k10 vin k11 vin j2 vin j3 vin j4 vin j9 vin j10 vin j11 gnd a6 gnd a7 gnd b6 gnd b7 gnd d1 gnd d2 gnd d3 gnd d4 gnd d9 gnd d10 gnd d11 gnd d12 gnd e1 gnd e2 gnd e3 gnd e4 gnd e10 gnd e11 gnd e12 gnd f1 gnd f2 gnd f3 gnd f10 gnd f11 gnd f12 gnd g1 gnd g3 gnd g10 gnd g12 gnd h1 gnd h2 gnd h3 gnd h4 gnd h5 gnd h6 gnd h7 gnd h9 gnd h10 gnd h11 gnd h12 gnd m12 gnd m1 gnd l12 gnd j1 gnd j5 gnd j8 gnd j12 gnd k1 gnd k5 gnd k6 gnd k7 gnd k8 gnd k12 gnd l1 sgnd c7 sgnd d6 sgnd f6 sgnd f7 sgnd g6 sgnd g7 fset c6 phasmd g4 diffp e8 diffn e9 clkout g5 mode-pllin f4 temp j6 intvcc h8 extvcc j7 diffout f8 c18 2.2uf 10v c18 2.2uf 10v r42 (opt) r42 (opt) cin13 (opt) 1210 cin13 (opt) 1210 r39 121k 1% r39 121k 1% r41 10k r41 10k r43 121k 1% r43 121k 1% cout26 (opt) 1210 cout26 (opt) 1210 cout22 (opt) 1210 cout22 (opt) 1210 r44 (opt) r44 (opt) cout20 (opt) 1210 cout20 (opt) 1210 cout21 (opt) 1210 cout21 (opt) 1210 cout24 100uf 10v 1210 cout24 100uf 10v 1210 + cout29 (opt) 7343 + cout29 (opt) 7343 cin11 1uf 25v 1210 cin11 1uf 25v 1210 r40 0 ohm r40 0 ohm sw2-3 sw2-3
11 dc1780aafa demo manual dc1780a-a information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. schematic diagram 5 5 4 4 3 3 2 2 1 1 d d c c b b a a load transient circuit clkout_u4 clkout_u4 comp run comp track vfb pgood run vfb track pgood clkout_u3 vfb comp clkout_u3 run track pgood intvcc_u4 vout vout vin extvcc intvcc_u4 vout vo+ vo- size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology )d[ 0loslwdv&$ 3krqh 0f&duwk\%oyg /7&&21),'(17,$/)25&86720(586(21/< customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.li near.com 1 '(02&,5&8,7$$ 0rqgd\'hfhpehu 4 4 +,*+()),&,(1&<32/<3+$6( 1$ /70(9 5% jeff z. 67(3'2:132:(502'8/(5(*8/$725 c:\pads projects\1780a\sch\1780a-a\1780a-a_00_rev1.dsn size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology )d[ 0loslwdv&$ 3krqh 0f&duwk\%oyg /7&&21),'(17,$/)25&86720(586(21/< customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.li near.com 1 '(02&,5&8,7$$ 0rqgd\'hfhpehu 4 4 +,*+()),&,(1&<32/<3+$6( 1$ /70(9 5% jeff z. 67(3'2:132:(502'8/(5(*8/$725 c:\pads projects\1780a\sch\1780a-a\1780a-a_00_rev1.dsn size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology )d[ 0loslwdv&$ 3krqh 0f&duwk\%oyg /7&&21),'(17,$/)25&86720(586(21/< customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.li near.com 1 '(02&,5&8,7$$ 0rqgd\'hfhpehu 4 4 +,*+()),&,(1&<32/<3+$6( 1$ /70(9 5% jeff z. 67(3'2:132:(502'8/(5(*8/$725 c:\pads projects\1780a\sch\1780a-a\1780a-a_00_rev1.dsn j7 vout j7 vout r49 (opt) r49 (opt) r53 (opt) r53 (opt) cout34 (opt) 1210 cout34 (opt) 1210 r51 121k 1% r51 121k 1% c22 2.2uf 10v c22 2.2uf 10v c26 (opt) c26 (opt) c27 1uf 10v c27 1uf 10v r52 (opt) r52 (opt) r58 (opt) 2512 r58 (opt) 2512 q2 sud50n03-09p q2 sud50n03-09p r48 (opt) r48 (opt) cin17 (opt) 1210 cin17 (opt) 1210 cout36 (opt) 1210 cout36 (opt) 1210 r47 121k 1% r47 121k 1% c23 1uf 10v c23 1uf 10v cin19 (opt) 1210 cin19 (opt) 1210 r57 0.010 1% 2w 2512 r57 0.010 1% 2w 2512 r45 0 ohm r45 0 ohm q1 sud50n03-09p q1 sud50n03-09p c21 (opt) c21 (opt) e18 sw2-4 e18 sw2-4 cout33 (opt) 1210 cout33 (opt) 1210 r46 0 ohm r46 0 ohm + cout37 (opt) 7343 + cout37 (opt) 7343 r50 (opt) r50 (opt) cout32 (opt) 1210 cout32 (opt) 1210 r55 (opt) r55 (opt) c30 (opt) c30 (opt) r59 (opt) 2512 r59 (opt) 2512 c29 (opt) c29 (opt) + cout31 (opt) 7343 + cout31 (opt) 7343 r54 10k r54 10k e17 sw1-4 e17 sw1-4 cout35 (opt) 1210 cout35 (opt) 1210 c28 1uf 10v c28 1uf 10v c24 0.01uf c24 0.01uf j8 iostep j8 iostep cin18 (opt) 1210 cin18 (opt) 1210 cin16 (opt) 1210 cin16 (opt) 1210 r56 0.010 1% 2w 2512 r56 0.010 1% 2w 2512 cout30 (opt) 1210 cout30 (opt) 1210 u4 (opt) u4 (opt) vout1 a1 vout1 a2 vout1 a3 vout1 a4 vout1 a5 vout1 b1 vout1 b2 vout1 b3 vout1 b4 vout1 b5 vout1 c1 vout1 c2 vout1 c3 vout1 c4 vfb1 d5 sw1 g2 pgood1 g9 comp1 e6 run1 f5 track1 e5 vout1s c5 vout2 a8 vout2 a9 vout2 a10 vout2 a11 vout2 a12 vout2 b8 vout2 b9 vout2 b10 vout2 b11 vout2 b12 vout2 c9 vout2 c10 vout2 c11 vout2 c12 vfb2 d7 sw2 g11 pgood2 g8 comp2 e7 run2 f9 track2 d8 vout2s c8 vin m2 vin m3 vin m4 vin m5 vin m6 vin m7 vin m8 vin m9 vin m10 vin m11 vin l2 vin l3 vin l4 vin l5 vin l6 vin l7 vin l8 vin l9 vin l10 vin l11 vin k2 vin k3 vin k4 vin k9 vin k10 vin k11 vin j2 vin j3 vin j4 vin j9 vin j10 vin j11 gnd a6 gnd a7 gnd b6 gnd b7 gnd d1 gnd d2 gnd d3 gnd d4 gnd d9 gnd d10 gnd d11 gnd d12 gnd e1 gnd e2 gnd e3 gnd e4 gnd e10 gnd e11 gnd e12 gnd f1 gnd f2 gnd f3 gnd f10 gnd f11 gnd f12 gnd g1 gnd g3 gnd g10 gnd g12 gnd h1 gnd h2 gnd h3 gnd h4 gnd h5 gnd h6 gnd h7 gnd h9 gnd h10 gnd h11 gnd h12 gnd m12 gnd m1 gnd l12 gnd j1 gnd j5 gnd j8 gnd j12 gnd k1 gnd k5 gnd k6 gnd k7 gnd k8 gnd k12 gnd l1 sgnd c7 sgnd d6 sgnd f6 sgnd f7 sgnd g6 sgnd g7 fset c6 phasmd g4 diffp e8 diffn e9 clkout g5 mode-pllin f4 temp j6 intvcc h8 extvcc j7 diffout f8 e19 iostep clk e19 iostep clk c25 0.1uf c25 0.1uf e20 gnd e20 gnd c20 (opt) c20 (opt)
12 dc1780aafa demo manual dc1780a-a linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com ? linear technology corporation 2012 lt 0712 rev a ? printed in usa demonstration board important notice linear technology corporation (ltc) provides the enclosed product(s) under the following as is conditions: this demonstration board (demo board) kit being sold or provided by linear technology is intended for use for engineering development or evaluation purposes only and is not provided by ltc for commercial use. as such, the demo board herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. as a prototype, this product does not fall within the scope of the europ ean union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or ot her regulations. if this evaluation kit does not meet the specifications recited in the demo board manual the kit may be returned within 30 days from the date of delivery for a full refund. the foregoing warranty is the exclusive warranty made by the seller to buyer and is in lieu of all other warranties, expressed, implied, or statutory, including any warranty of merchantability or fitness for any particular purpose. except to the extent of this indemnity, neither party shall be liable to the other for any indirect, special, incidental, or consequential damages. the user assumes all responsibility and liability for proper and safe handling of the goods. further, the user releases ltc fro m all claims arising from the handling or use of the goods. due to the open construction of the product, it is the users responsibility to take any and all appropriate precautions with regard to electrostatic discharge. also be aware that the products herein may not be regulatory co mpliant or agency certified (fcc, ul, ce, etc.). no license is granted under any patent right or other intellectual property whatsoever. ltc assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind . ltc currently services a variety of customers for products around the world, and therefore this transaction is not exclusive . please read the demo board manual prior to handling the product . persons handling this product must have electronics training and observe good laboratory practice standards. common sense is encouraged . this notice contains important safety information about temperatures and voltages. for further safety concerns, please contact a ltc applica- tion engineer. mailing address: linear technology 1630 mccarthy blvd. milpitas, ca 95035 copyright ? 2004, linear technology corporation

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