4 4 3 3 2 2 1 1 4 4 3 3 2 2 1 1 int ext 8v - 38v 25ma 3.3v 1.8v 600ma 1.2v 400ma 400ma hv buck mini-b usb _____ run shdn shdn _____ 5v adapter off soft-start on 0 1 on off ____ opt 3.3v ilim0 ilim1 0 ntc 1 off off on en1 en2 en3 on mode burst pulse-skip sync burst pulse-skip 3 step-down regulators + lt3480edd controlled input current limit suspend ilim1 ilim0 1 ibus(lim) 1 0 500ma (5x) 0 100ma (1x) 1a (10x) 0 1 1 0 * * ltc3557euf-1 -b 4.2v bat ltc3557euf u1 -a 4.1v assy (60v transient) * b DC1142A-A/b tuesday, march 18, 2008 11 b. shaffer b. shaffer a schematic ltc3557euf usb pwr mgr with li-ion charger and size date: dwg no. rev sheet of title: contract no. approvals drawn: checked: approved: engineer: designer: technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's r esponsibility to verify proper and reliable operation in the actual application. component substitution and printed ciruit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assist ance. this circuit is proprietary to linear te chnology and supplied for use with linear technology parts. vbus vout vbus vout d1 dfls240l e15 gnd r23 20 tp5 e5 prog u2 lt3480edd 1 2 3 4 5 7 6 8 9 10 11 bd boost sw vin run/ss pg sync fb vc rt gnd jp9 e10 en3 e18 chrg c7 10uf 0603 6.3v e19 bat r10 0 ltc3557euf-x u1 29 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 gnd ilim0 ilim1 wall ldo3v3 sw1 vin1 fb1 mode en1 en2 en3 fb3 fb2 rst2 sw2 vin2 sw3 vntc ntc prog gate bat vout vbus acpr vc clprog chrg r19 649k jp10 c11 1.0uf 6.3v 0402 c17 10uf 0603 6.3v j1 1 2 3 4 5 vbus d- d+ id gnd jp4 tp7 r17 464k l3 4.7uh 1098as-4r7m jp2 c3 0.47uf 10v e23 rst2 e26 vout3 r20 100k e7 ilim1 q1 si2333ds 1 3 2 e24 vout2 tp1 d- e21 vout1 c8 10uf 0603 6.3v e11 mode jp1 r7 2.0k e20 ldo3v3 c14 10pf 50v e2 4.35v - 5.5v vbus jp5 r3 499k c9 2.2uf 6.3v 0402 r21 20 l2 3.3uh 1098as-3r3m r18 806k e27 gnd q2 si2333ds 1 3 2 e25 gnd e22 gnd r25 1.0 + c18 100uf 6.3v oscon b6 c1 4.7uf 50v 1206 e4 clprog c2 0.068uf 50v 0805 d2 chrg c5 10uf 0603 6.3v e9 en2 jp6 l1 6.3uh nr6045t6r3m r4 20 tp4 e3 gnd r2 40.2k r9 100k c16 10pf 50v r12 510 r1 150k c10 2.2uf 6.3v 0402 tp2 d+ e13 ntc r8 100k jp11 e6 ilim0 r26 1.0 e16 vout 2.9v - 5.5v 2a r5 100k r16 232k jp7 e8 en1 c4 22uf 0805 6.3v r6 2.1k l4 4.7uh 1098as-4r7m c6 10uf 0603 6.3v e1 hvin c13 10uf 0603 6.3v r11 0 r24 0 tp3 id e14 5v adapter 4.5v - 5.5v e17 gnd r13 510 j2 df3-3p-2dsa 1 2 3 bat gnd entc r14 1.02m tp6 r22 20 jp3 jp8 e12 vntc c12 10pf 50v r15 324k c15 10uf 0603 6.3v
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