* SPICE netlist
XU1 OUT 0 N003 N002 N018 N014 OUT N011 N009 MP_01 MP_02 MP_03 MP_04 N007 MP_05 MP_06 N016 N015 MP_07 N017 MP_08 N013 MP_09 MP_10 N006 MP_11 MP_12 MP_13 MP_14 MP_15 MP_16 MP_17 N004 0 IN N012 N008 N005 N010 MP_18 0 LTC3883 VIN_ON=5.5 VIN_OFF=5 Vout=1.6 Ilim_range=1 OC_limit=1 Mode_ll=2 Fault_response=0 Retry_delay=.1m Freq=500K PHs=0 Ton_delay=.3m Ton_rise=.5m Toff_delay=.2m Toff_fall=.3m Vout_range=0 ;pnba Vsense+)Vsense-)Iin_sns)Vin_sns)Ith)Isense+)Isense-)SYNC)Pgood)))))Run)))Freq_cfg)Vout_cfg))Vtrim_cfg))VDD25)))VDD33))))))))IntVcc)PGND)Vin)BG)Boost)TG)SW))SGND
V1 IN 0 12
R1 IN N001 5m
R2 IN N002 100
R3 N001 N003 100
C1 N002 N003 1
C2 N002 0 10n
C3 N003 0 10n
C4 N004 0 1
C5 N013 0 1
C6 N006 0 1
C7 N018 0 2200p Rser=4.99K Cpar=100p
R4 N006 N007 10K
R5 N006 N009 10K
R6 N006 N011 5K
R7 N013 N016 20K
R8 N016 0 12.7K
R9 N013 N015 24.9K
R10 N015 0 9.09K
R11 N013 N017 10K
R12 N017 0 23.2K
M1 N001 N005 N010 N010 BSC050N03LS
M2 N010 N012 0 0 BSC011N03LS
C8 N008 N010 .1
D1 N004 N008 CMDSH2-3
L1 N010 OUT .56 Rser=1.8m
R13 N010 N014 1.4K
C9 N014 OUT .22
C10 OUT 0 330 V=6.3 Irms=6.6 Rser=0.006 Lser=0 mfg="KEMET" pn="T530Y337M006ATE006" type="Tantalum"
C11 OUT 0 100 x2 V=6.3 Irms=0 Rser=0.002 Lser=0 mfg="TDK" pn="C575OX5ROJI07M" type="X5R"
Rload OUT 0 90m
.tran 1.5m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 1680 1200
WIRE -264 -600 -408 -600
WIRE -248 -600 -264 -600
WIRE -152 -600 -168 -600
WIRE 248 -600 -152 -600
WIRE -264 -552 -264 -600
WIRE -152 -552 -152 -600
WIRE -344 -520 -344 -536
WIRE -88 -520 -88 -536
WIRE 88 -504 88 -520
WIRE -344 -440 -344 -456
WIRE -264 -440 -264 -472
WIRE -264 -440 -344 -440
WIRE -232 -440 -264 -440
WIRE -152 -440 -152 -472
WIRE -152 -440 -168 -440
WIRE -88 -440 -88 -456
WIRE -88 -440 -152 -440
WIRE 88 -424 88 -440
WIRE 88 -424 -40 -424
WIRE 248 -408 248 -600
WIRE -264 -392 -264 -440
WIRE -152 -392 -152 -440
WIRE -40 -392 -40 -424
WIRE -408 -328 -408 -600
WIRE -408 -328 -600 -328
WIRE -360 -328 -408 -328
WIRE 200 -328 56 -328
WIRE -600 -312 -600 -328
WIRE 88 -312 88 -424
WIRE -456 -232 -472 -232
WIRE -360 -232 -376 -232
WIRE 88 -232 88 -248
WIRE 88 -232 56 -232
WIRE -600 -216 -600 -232
WIRE 88 -216 88 -232
WIRE -472 -136 -472 -232
WIRE -456 -136 -472 -136
WIRE -360 -136 -376 -136
WIRE 88 -136 88 -152
WIRE 88 -136 56 -136
WIRE 248 -136 248 -312
WIRE 248 -136 88 -136
WIRE 440 -136 248 -136
WIRE 472 -136 440 -136
WIRE 584 -136 552 -136
WIRE 632 -136 584 -136
WIRE 728 -136 632 -136
WIRE 840 -136 728 -136
WIRE 248 -120 248 -136
WIRE 632 -120 632 -136
WIRE 728 -120 728 -136
WIRE 840 -120 840 -136
WIRE -472 -40 -472 -136
WIRE -456 -40 -472 -40
WIRE -360 -40 -376 -40
WIRE 200 -40 56 -40
WIRE 632 -24 632 -56
WIRE 728 -24 728 -56
WIRE 840 -24 840 -40
WIRE 248 -8 248 -24
WIRE -472 8 -472 -40
WIRE -392 8 -472 8
WIRE 440 40 440 -136
WIRE -472 56 -488 56
WIRE -392 56 -392 8
WIRE -392 56 -408 56
WIRE -360 56 -392 56
WIRE 72 56 56 56
WIRE -472 152 -488 152
WIRE -392 152 -408 152
WIRE -360 152 -392 152
WIRE 88 152 56 152
WIRE 440 152 440 120
WIRE 440 152 88 152
WIRE 88 168 88 152
WIRE -680 216 -824 216
WIRE -536 216 -680 216
WIRE -392 216 -392 152
WIRE -392 216 -536 216
WIRE -824 232 -824 216
WIRE -680 232 -680 216
WIRE -536 232 -536 216
WIRE -360 248 -376 248
WIRE 88 248 88 232
WIRE 88 248 56 248
WIRE 584 248 584 -136
WIRE 584 248 88 248
WIRE -712 312 -824 312
WIRE -568 312 -680 312
WIRE -376 312 -376 248
WIRE -376 312 -536 312
WIRE -824 328 -824 312
WIRE -680 328 -680 312
WIRE -536 328 -536 312
WIRE -360 344 -408 344
WIRE 88 344 88 248
WIRE 88 344 56 344
WIRE -824 424 -824 408
WIRE -680 424 -680 408
WIRE -536 424 -536 408
WIRE -360 440 -376 440
WIRE 88 440 56 440
WIRE -568 456 -568 312
WIRE -408 456 -408 344
WIRE -408 456 -568 456
WIRE -712 472 -712 312
WIRE -376 472 -376 440
WIRE -376 472 -712 472
WIRE -216 520 -216 504
WIRE -88 520 -88 504
WIRE -88 600 -88 584
FLAG -216 520 0
FLAG -600 -216 0
FLAG -88 -536 0
FLAG -344 -536 0
FLAG 88 -520 0
FLAG -488 152 0
FLAG -488 56 0
FLAG -88 600 0
FLAG -824 424 0
FLAG -536 424 0
FLAG -680 424 0
FLAG 72 56 0
FLAG 248 -8 0
FLAG 632 -24 0
FLAG 728 -24 0
FLAG 840 -24 0
FLAG -600 -328 IN
FLAG 840 -136 OUT
FLAG 88 440 0
SYMBOL PowerProducts\\LTC3883 -152 56 R0
SYMATTR InstName U1
SYMATTR SpiceLine VIN_ON=5.5 VIN_OFF=5 Vout=1.6 Ilim_range=1  OC_limit=1  Mode_ll=2 Fault_response=0 Retry_delay=.1m
SYMBOL voltage -600 -328 R0
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL res -264 -584 R270
SYMATTR InstName R1
SYMATTR Value 5m
SYMBOL res -280 -568 R0
SYMATTR InstName R2
SYMATTR Value 100
SYMBOL res -168 -568 R0
SYMATTR InstName R3
SYMATTR Value 100
SYMBOL cap -232 -424 R270
SYMATTR InstName C1
SYMATTR Value 1
SYMBOL cap -360 -456 M180
SYMATTR InstName C2
SYMATTR Value 10n
SYMBOL cap -104 -456 M180
SYMATTR InstName C3
SYMATTR Value 10n
SYMBOL cap 72 -440 M180
SYMATTR InstName C4
SYMATTR Value 1
SYMBOL cap -408 136 R90
SYMATTR InstName C5
SYMATTR Value 1
SYMBOL cap -408 40 R90
SYMATTR InstName C6
SYMATTR Value 1
SYMBOL cap -104 520 R0
SYMATTR InstName C7
SYMATTR Value 2200p
SYMATTR SpiceLine Rser=4.99K Cpar=100p
SYMBOL res -472 -216 R270
SYMATTR InstName R4
SYMATTR Value 10K
SYMBOL res -472 -120 R270
SYMATTR InstName R5
SYMATTR Value 10K
SYMBOL res -472 -24 R270
SYMATTR InstName R6
SYMATTR Value 5K
SYMBOL res -840 216 R0
SYMATTR InstName R7
SYMATTR Value 20K
SYMBOL res -840 312 R0
SYMATTR InstName R8
SYMATTR Value 12.7K
SYMBOL res -552 216 R0
SYMATTR InstName R9
SYMATTR Value 24.9K
SYMBOL res -552 312 R0
SYMATTR InstName R10
SYMATTR Value 9.09K
SYMBOL res -696 216 R0
SYMATTR InstName R11
SYMATTR Value 10K
SYMBOL res -696 312 R0
SYMATTR InstName R12
SYMATTR Value 23.2K
SYMBOL nmos 200 -408 R0
SYMATTR InstName M1
SYMATTR Value BSC050N03LS
SYMBOL nmos 200 -120 R0
SYMATTR InstName M2
SYMATTR Value BSC011N03LS
SYMBOL cap 72 -216 R0
SYMATTR InstName C8
SYMATTR Value .1
SYMBOL schottky 72 -312 R0
SYMATTR InstName D1
SYMATTR Value CMDSH2-3
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL ind 456 -120 R270
SYMATTR InstName L1
SYMATTR Value .56
SYMATTR SpiceLine Rser=1.8m
SYMBOL res 424 24 R0
SYMATTR InstName R13
SYMATTR Value 1.4K
SYMBOL cap 72 168 R0
SYMATTR InstName C9
SYMATTR Value .22
SYMBOL polcap 616 -120 R0
SYMATTR Value 330
SYMATTR InstName C10
SYMATTR Description Capacitor
SYMATTR Type cap
SYMATTR SpiceLine V=6.3 Irms=6.6 Rser=0.006 Lser=0 mfg="KEMET" pn="T530Y337M006ATE006" type="Tantalum"
SYMBOL cap 712 -120 R0
SYMATTR Value2 x2
SYMATTR InstName C11
SYMATTR Value 100
SYMATTR SpiceLine V=6.3 Irms=0 Rser=0.002 Lser=0 mfg="TDK" pn="C575OX5ROJI07M" type="X5R"
SYMBOL res 824 -136 R0
SYMATTR InstName Rload
SYMATTR Value 90m