* SPICE netlist
M1 OUT2 GATE N010 N010 PSMN4R8100BSE
R4 N010 0 .1
V2 SYS 0 56
V1 N005 0 3.3
Rpm N008 0 10k
M2 IN HSgate OUT OUT SUD40N10-25
C1 N003 COM 47n
R1 HSgate N003 3.32k
C2 OUT COM 10 Rser=1.8
C3 N002 COM .1
R2 IN N002 8.25
R3 OUT pwrGD 100k
R6 OUT _TP2 100k
D1 N001 IN MURS120 N=2
Rload1 OUT COM 3.9k
Rcls1 N007 COM 49.9
Rcls2 N009 COM 118
D2 COM OUT2 MURS120 N=2
Rcable1 SYS N001 12
R7 IN2 LED 12k
C6 IN2 OUT2 .22 Rser=10m
C4 IN2 0 1
R8 SYS IN2 10
R5 N006 N005 100
XU2 COM COM N007 N009 COM _TP2 pwrGD OUT HSgate N002 LT4275A ;pnba _IEEEUVLO)AUX)Rclass)Rclass++)GND)_T2P)pwrGD)HSsrc)HSgate)Vport
S3 OUT2 N001 N004 0 SLOAD
V3 N004 0 PWL(0.8 0 +100n 1 +61m 1 +100n 0)
XU1 IN2 LED 0 0 N010 GATE OUT2 N006 NC_01 N008 LTC4279 ;pnba AGND)LED)VSSK)VEE)SENSE)GATE)OUT)_RESET)MID)PWRMODE
.tran 3 startup

* LTspice schematic (.asc)
Version 4.1
SHEET 1 3456 832
WIRE 1568 -416 -48 -416
WIRE -528 -304 -1728 -304
WIRE -160 -304 -528 -304
WIRE -48 -304 -48 -416
WIRE -48 -304 -80 -304
WIRE 16 -304 -48 -304
WIRE 448 -304 80 -304
WIRE 688 -304 448 -304
WIRE 848 -304 688 -304
WIRE 1072 -304 944 -304
WIRE 1216 -304 1072 -304
WIRE 1360 -304 1216 -304
WIRE -528 -272 -528 -304
WIRE 688 -272 688 -304
WIRE 928 -224 928 -256
WIRE 976 -224 928 -224
WIRE 976 -208 976 -224
WIRE -528 -176 -528 -192
WIRE -496 -176 -528 -176
WIRE -432 -176 -496 -176
WIRE -400 -176 -432 -176
WIRE -240 -176 -400 -176
WIRE 688 -176 688 -192
WIRE 720 -176 688 -176
WIRE -496 -160 -496 -176
WIRE 720 -160 720 -176
WIRE -400 -144 -400 -176
WIRE -528 -112 -528 -176
WIRE -528 -112 -576 -112
WIRE 272 -112 240 -112
WIRE 688 -112 688 -176
WIRE 688 -112 656 -112
WIRE 976 -112 976 -128
WIRE -496 -80 -496 -96
WIRE 720 -80 720 -96
WIRE 1728 -80 1616 -80
WIRE 1216 -64 1216 -304
WIRE 1360 -64 1360 -304
WIRE 1568 -64 1568 -416
WIRE 1728 -64 1728 -80
WIRE -240 -48 -240 -176
WIRE 272 -48 240 -48
WIRE 816 -48 656 -48
WIRE 928 -48 928 -224
WIRE 928 -48 816 -48
WIRE 1616 -48 1616 -80
WIRE -1504 -32 -1568 -32
WIRE -1376 -32 -1424 -32
WIRE -448 -32 -576 -32
WIRE -400 -32 -400 -64
WIRE -400 -32 -448 -32
WIRE -1728 -16 -1728 -304
WIRE -1568 -16 -1568 -32
WIRE 976 -16 976 -48
WIRE 80 16 64 16
WIRE 272 16 160 16
WIRE 1072 16 1072 -304
WIRE 1072 16 656 16
WIRE 1728 32 1728 16
WIRE -1376 48 -1472 48
WIRE -1568 80 -1568 64
WIRE -1472 80 -1472 48
WIRE 160 80 64 80
WIRE 272 80 240 80
WIRE 720 80 656 80
WIRE 752 80 720 80
WIRE 1072 80 1072 16
WIRE 1072 80 832 80
WIRE 272 144 240 144
WIRE 736 144 656 144
WIRE 864 144 736 144
WIRE 1072 144 1072 80
WIRE 1072 144 944 144
WIRE -752 176 -752 128
WIRE -1472 208 -1472 160
WIRE -752 224 -752 176
WIRE -1728 272 -1728 64
WIRE -1088 272 -1088 128
WIRE -1088 272 -1728 272
WIRE -976 272 -976 128
WIRE -976 272 -1088 272
WIRE -960 272 -976 272
WIRE -864 272 -864 128
WIRE -864 272 -880 272
WIRE -768 272 -864 272
WIRE -640 272 -640 128
WIRE -640 272 -672 272
WIRE -496 272 -640 272
WIRE -240 272 -240 16
WIRE -240 272 -496 272
WIRE -48 272 -240 272
WIRE 16 272 -48 272
WIRE 464 272 80 272
WIRE 1216 272 1216 0
WIRE 1216 272 464 272
WIRE 1360 272 1360 16
WIRE 1360 272 1216 272
WIRE -1728 320 -1728 272
WIRE 464 320 464 272
WIRE -48 416 -48 272
WIRE 1568 416 1568 16
WIRE 1568 416 -48 416
FLAG -1728 320 0
FLAG -1568 80 0
FLAG -496 272 OUT2
FLAG 720 -80 COM
FLAG 976 -16 COM
FLAG 240 -112 COM
FLAG 1360 -304 OUT
FLAG 240 144 COM
FLAG 240 -48 COM
FLAG 64 16 COM
FLAG 64 80 COM
FLAG -1472 208 0
FLAG 448 -304 IN
FLAG -432 -176 IN2
FLAG -496 -80 0
FLAG -448 -32 LED
FLAG -752 176 GATE
FLAG 464 320 COM
FLAG 736 144 _TP2
FLAG 720 80 pwrGD
FLAG 1616 0 0
FLAG 1728 32 0
FLAG 816 -48 HSgate
FLAG -1728 -304 SYS
SYMBOL nmos -672 224 R90
SYMATTR InstName M1
SYMATTR Value PSMN4R8100BSE
SYMBOL res -864 256 R90
SYMATTR InstName R4
SYMATTR Value .1
SYMBOL voltage -1728 -32 R0
SYMATTR InstName V2
SYMATTR Value 56
SYMBOL voltage -1568 -32 R0
SYMATTR InstName V1
SYMATTR Value 3.3
SYMBOL res -1488 64 R0
SYMATTR InstName Rpm
SYMATTR Value 10k
SYMBOL nmos 848 -256 R270
SYMATTR InstName M2
SYMATTR Value SUD40N10-25
SYMBOL cap 960 -112 R0
SYMATTR InstName C1
SYMATTR Value 47n
SYMBOL res 960 -224 R0
SYMATTR InstName R1
SYMATTR Value 3.32k
SYMBOL polcap 1200 -64 R0
SYMATTR Value 10
SYMATTR SpiceLine Rser=1.8
SYMATTR InstName C2
SYMATTR Description Capacitor
SYMATTR Type cap
SYMBOL cap 704 -160 R0
SYMATTR InstName C3
SYMATTR Value .1
SYMBOL res 672 -288 R0
SYMATTR InstName R2
SYMATTR Value 8.25
SYMBOL res 848 64 R90
SYMATTR InstName R3
SYMATTR Value 100k
SYMBOL res 960 128 R90
SYMATTR InstName R6
SYMATTR Value 100k
SYMBOL diode 16 -288 R270
SYMATTR InstName D1
SYMATTR Value MURS120
SYMATTR Value2 N=2
SYMBOL res 1344 -80 R0
SYMATTR InstName Rload1
SYMATTR Value 3.9k
SYMBOL res 176 0 R90
SYMATTR InstName Rcls1
SYMATTR Value 49.9
SYMBOL res 256 64 R90
SYMATTR InstName Rcls2
SYMATTR Value 118
SYMBOL diode 80 288 M270
SYMATTR InstName D2
SYMATTR Value MURS120
SYMATTR Value2 N=2
SYMBOL res -176 -288 R270
SYMATTR InstName Rcable1
SYMATTR Value 12
SYMBOL res -416 -160 R0
SYMATTR InstName R7
SYMATTR Value 12k
SYMBOL cap -256 -48 R0
SYMATTR SpiceLine Rser=10m
SYMATTR InstName C6
SYMATTR Value .22
SYMBOL cap -512 -160 R0
SYMATTR InstName C4
SYMATTR Value 1
SYMBOL res -544 -288 R0
SYMATTR InstName R8
SYMATTR Value 10
SYMBOL res -1408 -48 R90
SYMATTR InstName R5
SYMATTR Value 100
SYMBOL PowerProducts\\LT4275A 464 16 R0
SYMATTR InstName U2
SYMBOL sw 1568 32 R180
SYMATTR InstName S3
SYMATTR Value SLOAD
SYMBOL voltage 1728 -80 R0
SYMATTR InstName V3
SYMATTR Value PWL(0.8 0 +100n 1 +61m 1 +100n 0)
SYMBOL LTC4279 -976 -64 R0
SYMATTR InstName U1