* SPICE netlist
V1 IN 0 48
MQ1 N006 N012 0 0 FDS5690
MQ2 N006 N002 IN IN IRF7343P
C1 N004 0 470p
C2 N009 0 3300p
C3 N003 0 3.3
C4 N001 N003 .068
D1 N001 IN 1N4148
D2 N002 IN 1N4148
L1 N006 N007 62
C5 N007 OUT 1000p
C6 N002 N005 .047
D3 0 N006 MBRS360
C7 OUT 0 220 Rser=.01
XU1 N002 IN N003 N005 MP_01 N004 N010 OUT N007 N011 0 0 N012 0 N008 N001 LTC1149 ;pnba P-Gate)Vin)Vcc)P-Drive))Ct)Ith)Sense-)Sense+)FB)SGND)PGND)N-Gate)RGND)SHDN2)CAP
R1 OUT N011 164K
R2 N011 0 100K
R3 N010 N009 1K
R4 N007 OUT 50m
Rload OUT 0 5
.tran 8m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 1344 592
WIRE -352 -296 -656 -296
WIRE -288 -296 -352 -296
WIRE -160 -296 -224 -296
WIRE 0 -296 -160 -296
WIRE 192 -296 0 -296
WIRE 352 -296 192 -296
WIRE 352 -280 352 -296
WIRE -656 -248 -656 -296
WIRE 0 -248 0 -296
WIRE -352 -200 -352 -296
WIRE -160 -200 -160 -296
WIRE 192 -200 192 -296
WIRE 144 -184 112 -184
WIRE 352 -184 352 -200
WIRE -656 -136 -656 -184
WIRE -464 -136 -656 -136
WIRE 0 -136 0 -184
WIRE 0 -136 -48 -136
WIRE 112 -136 112 -184
WIRE 112 -136 0 -136
WIRE 0 -120 0 -136
WIRE -656 -104 -656 -136
WIRE -544 -56 -560 -56
WIRE -464 -56 -480 -56
WIRE 0 -56 -48 -56
WIRE 192 -56 192 -104
WIRE 224 -56 192 -56
WIRE 320 -56 304 -56
WIRE 336 -56 320 -56
WIRE 432 -56 416 -56
WIRE 560 -56 432 -56
WIRE 672 -56 560 -56
WIRE 672 -40 672 -56
WIRE -656 -24 -656 -40
WIRE 560 -8 560 -56
WIRE -464 24 -496 24
WIRE 0 24 -48 24
WIRE 320 24 320 -56
WIRE 320 24 0 24
WIRE 672 56 672 40
WIRE -640 104 -656 104
WIRE -560 104 -576 104
WIRE -464 104 -480 104
WIRE 0 104 0 88
WIRE 0 104 -48 104
WIRE 432 104 432 -56
WIRE 432 104 0 104
WIRE 560 120 560 72
WIRE 560 120 512 120
WIRE 192 136 192 -56
WIRE 256 136 192 136
WIRE 432 136 432 104
WIRE 560 136 560 120
WIRE 192 152 192 136
WIRE 256 168 256 136
WIRE -464 184 -496 184
WIRE 112 184 -48 184
WIRE 112 232 112 184
WIRE 144 232 112 232
WIRE 432 232 432 200
WIRE 560 232 560 216
WIRE -384 264 -384 248
WIRE -256 264 -256 248
WIRE -128 264 -128 248
WIRE 192 264 192 248
WIRE 256 264 256 232
WIRE -496 296 -496 184
WIRE 512 296 512 120
WIRE 512 296 -496 296
FLAG 352 -184 0
FLAG 192 264 0
FLAG -128 264 0
FLAG -256 264 0
FLAG -384 264 0
FLAG -560 -56 0
FLAG -656 104 0
FLAG -656 -24 0
FLAG 256 264 0
FLAG 432 232 0
FLAG 672 56 0
FLAG 560 232 0
FLAG 672 -56 OUT
FLAG 352 -296 IN
SYMBOL VOLTAGE 352 -296 R0
SYMATTR InstName V1
SYMATTR Value 48
SYMBOL NMOS 144 152 R0
SYMATTR InstName Q1
SYMATTR Value FDS5690
SYMBOL PMOS 144 -104 M180
SYMATTR InstName Q2
SYMATTR Value IRF7343P
SYMBOL cap -480 -72 R90
SYMATTR InstName C1
SYMATTR Value 470p
SYMBOL cap -576 88 R90
SYMATTR InstName C2
SYMATTR Value 3300p
SYMBOL polcap -672 -104 R0
SYMATTR Value 3.3
SYMATTR InstName C3
SYMBOL cap -672 -248 R0
SYMATTR InstName C4
SYMATTR Value .068
SYMBOL diode -288 -280 R270
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL diode -16 -184 M180
SYMATTR InstName D2
SYMATTR Value 1N4148
SYMBOL ind 208 -40 R270
SYMATTR InstName L1
SYMATTR Value 62
SYMBOL cap -16 24 R0
SYMATTR InstName C5
SYMATTR Value 1000p
SYMBOL cap -16 -120 R0
SYMATTR InstName C6
SYMATTR Value .047
SYMBOL schottky 240 232 M180
SYMATTR InstName D3
SYMATTR Value MBRS360
SYMBOL polcap 416 136 R0
SYMATTR InstName C7
SYMATTR Value 220
SYMATTR SpiceLine Rser=.01
SYMBOL POWERPRODUCTS\\LTC1149 -256 24 R0
SYMATTR InstName U1
SYMBOL RES 544 -24 R0
SYMATTR InstName R1
SYMATTR Value 164K
SYMBOL res 544 120 R0
SYMATTR InstName R2
SYMATTR Value 100K
SYMBOL RES -464 88 R90
SYMATTR InstName R3
SYMATTR Value 1K
SYMBOL res 320 -40 R270
SYMATTR InstName R4
SYMATTR Value 50m
SYMBOL res 656 -56 R0
SYMATTR InstName Rload
SYMATTR Value 5