* SPICE netlist
VP V+ 0 12
VN 0 V- 12
VINA IN+ 0 PWL(0 0 1m 10m)
VINB IN- 0 0
VP1 VCC 0 3.3
V_EN EN 0 PULSE(-4 12 0 1n 1n 299n 500n)
Q10 N002 IN+ N006 0 2N3904
R20 N006 N008 56
R22 N007 N008 56
Q11 N004 IN- N007 0 2N3904
Q19 N008 N009 N010 0 2N3904
Q20 V+ N002 O- 0 2N3904
Q21 V+ N004 O+ 0 2N3904
R24 N010 V- 600
R25 O- V- 6.8k
R26 O+ V- 6.8k
R27 N012 V- 300
R34 N001 N004 1k
R35 N001 N002 1k
R36 V+ N001 1.7k
Q26 N009 N009 N012 0 2N3904
Q27 V_REF N009 N011 0 2N3904
R37 N011 V- 300
R38 V+ V_REF 300
R39 SENSE_OUT2- O- 100
R42 SENSE_OUT2+ O+ 100
Q29 N002 N003 N006 0 2N3904
Q30 N004 N005 N007 0 2N3904
Q31 V- EN SENSE_OUT2- 0 2N3906
Q32 V- EN SENSE_OUT2+ 0 2N3906
R28 V+ N009 2k
D1 N003 N002 BAT54
D2 N005 N004 BAT54
R29 SENSE_OUT2+ N003 1k
R30 SENSE_OUT2- N005 1k
.tran 20u
.step temp -25 125 25
;.step param in_ampl 1000u 10000u 500u
.temp 125

* LTspice schematic (.asc)
Version 4.1
SHEET 1 2336 2128
WIRE -464 -1064 -512 -1064
WIRE -416 -1064 -464 -1064
WIRE -304 -1064 -352 -1064
WIRE -272 -1064 -304 -1064
WIRE -96 -1064 -176 -1064
WIRE 128 -1064 -96 -1064
WIRE 368 -1064 320 -1064
WIRE 416 -1064 368 -1064
WIRE 592 -1064 544 -1064
WIRE 640 -1064 592 -1064
WIRE 64 -1000 0 -1000
WIRE 128 -1000 64 -1000
WIRE -512 -936 -512 -1064
WIRE -352 -936 -352 -1064
WIRE -176 -936 -176 -1064
WIRE 0 -936 0 -1000
WIRE 320 -936 320 -1064
WIRE 544 -936 544 -1064
WIRE 1056 -648 -976 -648
WIRE 1008 -600 -384 -600
WIRE -848 -552 -896 -552
WIRE -624 -552 -848 -552
WIRE -288 -552 -624 -552
WIRE -208 -552 -288 -552
WIRE 0 -552 -208 -552
WIRE 192 -552 0 -552
WIRE -624 -456 -624 -552
WIRE 192 -424 192 -552
WIRE -976 -392 -976 -648
WIRE -384 -392 -384 -600
WIRE -624 -248 -624 -376
WIRE -624 -248 -736 -248
WIRE -544 -248 -624 -248
WIRE -736 -200 -736 -248
WIRE -544 -200 -544 -248
WIRE -288 -120 -288 -552
WIRE -736 -72 -736 -120
WIRE -352 -72 -736 -72
WIRE -976 -56 -976 -312
WIRE -912 -56 -976 -56
WIRE -816 -56 -848 -56
WIRE -544 -40 -544 -120
WIRE -496 -40 -544 -40
WIRE -384 -40 -384 -312
WIRE -384 -40 -432 -40
WIRE -816 -8 -816 -56
WIRE -736 -8 -736 -72
WIRE -736 -8 -816 -8
WIRE -544 -8 -544 -40
WIRE -464 -8 -544 -8
WIRE -288 8 -288 -24
WIRE 256 8 -288 8
WIRE 368 8 256 8
WIRE 544 8 448 8
WIRE 1008 8 1008 -600
WIRE 1008 8 544 8
WIRE 1168 8 1008 8
WIRE -976 40 -976 -56
WIRE -880 40 -976 40
WIRE -384 40 -384 -40
WIRE -384 40 -400 40
WIRE -208 104 -208 -552
WIRE -544 152 -544 -8
WIRE -272 152 -544 152
WIRE 192 232 192 -344
WIRE -736 248 -736 -8
WIRE -544 248 -544 152
WIRE -1120 296 -1168 296
WIRE -800 296 -1120 296
WIRE -384 296 -480 296
WIRE -208 328 -208 200
WIRE 256 328 -208 328
WIRE 368 328 256 328
WIRE 944 328 448 328
WIRE 1056 328 1056 -648
WIRE 1056 328 944 328
WIRE 1168 328 1056 328
WIRE -816 376 -816 88
WIRE -736 376 -736 344
WIRE -736 376 -816 376
WIRE -544 376 -544 344
WIRE -464 376 -464 88
WIRE -464 376 -544 376
WIRE -736 392 -736 376
WIRE -544 392 -544 376
WIRE 0 472 0 -552
WIRE 544 488 544 8
WIRE 944 488 944 328
WIRE -736 536 -736 472
WIRE -624 536 -736 536
WIRE -544 536 -544 472
WIRE -544 536 -624 536
WIRE 384 536 288 536
WIRE 480 536 384 536
WIRE 784 536 688 536
WIRE 880 536 784 536
WIRE -1120 568 -1168 568
WIRE -384 568 -384 296
WIRE -384 568 -1120 568
WIRE -624 632 -624 536
WIRE 192 632 192 232
WIRE -480 680 -560 680
WIRE -368 680 -480 680
WIRE 0 680 0 552
WIRE 0 680 -368 680
WIRE 128 680 0 680
WIRE -480 760 -480 680
WIRE -368 808 -368 680
WIRE -368 808 -416 808
WIRE -288 840 -288 8
WIRE -208 840 -208 328
WIRE 544 840 544 584
WIRE 752 840 544 840
WIRE 944 840 944 584
WIRE 944 840 752 840
WIRE -624 872 -624 728
WIRE 192 888 192 728
WIRE -480 936 -480 856
WIRE -864 1064 -896 1064
WIRE -624 1064 -624 952
WIRE -624 1064 -864 1064
WIRE -480 1064 -480 1016
WIRE -480 1064 -624 1064
WIRE -288 1064 -288 920
WIRE -288 1064 -480 1064
WIRE -208 1064 -208 920
WIRE -208 1064 -288 1064
WIRE 192 1064 192 968
WIRE 192 1064 -208 1064
WIRE 752 1064 752 840
WIRE 752 1064 192 1064
WIRE 944 1064 752 1064
FLAG -512 -856 0
FLAG -176 -856 0
FLAG -352 -856 0
FLAG 0 -856 0
FLAG -464 -1064 V+
FLAG -304 -1064 V-
FLAG -96 -1064 IN+
FLAG 64 -1000 IN-
FLAG 320 -856 0
FLAG 368 -1064 VCC
FLAG 544 -856 0
FLAG 592 -1064 EN
FLAG 1168 8 SENSE_OUT2-
FLAG -1120 296 IN+
FLAG -1120 568 IN-
FLAG -848 -552 V+
FLAG -864 1064 V-
FLAG 192 232 V_REF
FLAG 1168 328 SENSE_OUT2+
FLAG 384 536 EN
FLAG 784 536 EN
FLAG 256 8 O-
FLAG 256 328 O+
SYMBOL voltage -512 -952 R0
SYMATTR InstName VP
SYMATTR Value 12
SYMBOL voltage -352 -840 R180
SYMATTR InstName VN
SYMATTR Value 12
SYMBOL voltage -176 -952 R0
SYMATTR InstName VINA
SYMATTR Value PWL(0 0 1m 10m)
SYMBOL voltage 0 -952 R0
SYMATTR InstName VINB
SYMATTR Value 0
SYMBOL voltage 320 -952 R0
SYMATTR InstName VP1
SYMATTR Value 3.3
SYMBOL voltage 544 -952 R0
SYMATTR InstName V_EN
SYMATTR Value PULSE(-4 12 0 1n 1n 299n 500n)
SYMBOL npn -800 248 R0
SYMATTR InstName Q10
SYMATTR Value 2N3904
SYMBOL res -752 376 R0
SYMATTR InstName R20
SYMATTR Value 56
SYMBOL res -560 376 R0
SYMATTR InstName R22
SYMATTR Value 56
SYMBOL npn -480 248 M0
SYMATTR InstName Q11
SYMATTR Value 2N3904
SYMBOL npn -560 632 M0
SYMATTR InstName Q19
SYMATTR Value 2N3904
SYMBOL npn -352 -120 R0
SYMATTR InstName Q20
SYMATTR Value 2N3904
SYMBOL npn -272 104 R0
SYMATTR InstName Q21
SYMATTR Value 2N3904
SYMBOL res -640 856 R0
SYMATTR InstName R24
SYMATTR Value 600
SYMBOL res -304 824 R0
SYMATTR InstName R25
SYMATTR Value 6.8k
SYMBOL res -224 824 R0
SYMATTR InstName R26
SYMATTR Value 6.8k
SYMBOL res -496 920 R0
SYMATTR InstName R27
SYMATTR Value 300
SYMBOL res -560 -216 R0
SYMATTR InstName R34
SYMATTR Value 1k
SYMBOL res -752 -216 R0
SYMATTR InstName R35
SYMATTR Value 1k
SYMBOL res -640 -472 R0
SYMATTR InstName R36
SYMATTR Value 1.7k
SYMBOL npn -416 760 M0
SYMATTR InstName Q26
SYMATTR Value 2N3904
SYMBOL npn 128 632 R0
SYMATTR InstName Q27
SYMATTR Value 2N3904
SYMBOL res 176 872 R0
SYMATTR InstName R37
SYMATTR Value 300
SYMBOL res 176 -440 R0
SYMATTR InstName R38
SYMATTR Value 300
SYMBOL res 464 -8 R90
SYMATTR InstName R39
SYMATTR Value 100
SYMBOL res 464 312 R90
SYMATTR InstName R42
SYMATTR Value 100
SYMBOL npn -880 -8 R0
SYMATTR InstName Q29
SYMATTR Value 2N3904
SYMBOL npn -400 -8 M0
SYMATTR InstName Q30
SYMATTR Value 2N3904
SYMBOL pnp 480 584 M180
SYMATTR InstName Q31
SYMATTR Value 2N3906
SYMBOL pnp 880 584 M180
SYMATTR InstName Q32
SYMATTR Value 2N3906
SYMBOL res -16 456 R0
SYMATTR InstName R28
SYMATTR Value 2k
SYMBOL schottky -912 -40 R270
SYMATTR InstName D1
SYMATTR Value BAT54
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL schottky -432 -24 M270
SYMATTR InstName D2
SYMATTR Value BAT54
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res -992 -408 R0
SYMATTR InstName R29
SYMATTR Value 1k
SYMBOL res -400 -408 R0
SYMATTR InstName R30
SYMATTR Value 1k