* Z:\tmp\asc_mix_bvbm4pog\mix_147.asc
* Generated by LTspice 26.0.1 for Windows.
V1 IN 0 5
I1 OUT 0 {iload} load
XU2 IN 0 IN OUT LTC1844-2.8 ;pnba IN)GND)_SHDN)OUT
Md1 vgatep N001 vs vs NMOS-SH l=1u w=10u
VSS 0 -VSS 1.5
Md2 vincs 0 vs vs NMOS-SH l=1u w=10u
Mtail vs vgatebias -VSS -VSS NMOS-SH l=1u w=10u
Mp2 vincs vgatep VDD VDD PMOS-SH l=1u w=10u
Mp1 vgatep vgatep VDD VDD PMOS-SH l=1u w=10u
Mbias vgatebias vgatebias -VSS -VSS NMOS-SH l=1u w=10u
R1 VDD vgatebias 20k
VDD VDD 0 1.5
VCM vin 0 PWL(0 0 10n 0 11n 10m) AC 1
C1 vout 0 0.5p
R2 vout N001 10Meg
R3 N001 vin 2.5Meg
C2 vout 0 0.5p
Mp3 vout vincs VDD VDD PMOS-SH l=1u w=100u
Mtail1 vout vgatebias -VSS -VSS NMOS-SH l=1u w=10u
C3 vincs vout 2p
.model NMOS NMOS
.model PMOS PMOS
.lib C:\users\khalils\AppData\Local\LTspice\lib\cmp\standard.mos
.dc v1 5 2 10m
.measure DC vdrop WHEN V(out)=2.7
.measure DC dropout param Vdrop-2.7
.param iload=150m
;op
;.ac oct 100 10 1000MEG
.model PMOS-SH pmos (Kp=55u Vto=-0.71 lambda=0.16 lambda=0.16 gamma=0.75 phi=0.7 TOX=8n CGSO=0.2f CGBO=0.2f CGDO=0.2f CJ=1.5m CJSW=0.5n)
.model NMOS-SH nmos (Kp=190u Vto=0.57 lambda=0.16 lambda=0.16 gamma=0.5 phi=0.7 TOX=8n CGSO=0.2f CGBO=0.2f CGDO=0.2f CJ=1m CJSW=0.4n)
* Library below included based on ModelFile attribute of instance XU2 (C:\users\khalils\AppData\Local\LTspice\lib\sym\PowerProducts\LTC1844-2.8.asy)
.lib LTC1844-2.8.sub
.backanno
.end

* LTspice schematic (.asc):
Version 4
SHEET 1 3168 832
WIRE 64 80 -80 80
WIRE 80 80 64 80
WIRE 432 80 368 80
WIRE -80 96 -80 80
WIRE 432 96 432 80
WIRE -80 192 -80 176
WIRE 432 192 432 176
WIRE 64 240 64 80
WIRE 80 240 64 240
WIRE 224 304 224 288
WIRE 1056 -64 832 -64
WIRE 1280 -64 1056 -64
WIRE 1360 -64 1280 -64
WIRE 1472 -64 1360 -64
WIRE 1712 -64 1472 -64
WIRE 1776 -64 1712 -64
WIRE 1984 -64 1776 -64
WIRE 2032 -64 1984 -64
WIRE 1360 0 1360 -64
WIRE 1712 0 1712 -64
WIRE 1520 16 1408 16
WIRE 1552 16 1520 16
WIRE 1664 16 1552 16
WIRE 1280 48 1280 -64
WIRE 1360 48 1280 48
WIRE 1776 48 1776 -64
WIRE 1776 48 1712 48
WIRE 832 80 832 -64
WIRE 1984 80 1984 -64
WIRE 2256 80 2176 80
WIRE 2320 80 2256 80
WIRE 2448 80 2400 80
WIRE 2512 80 2448 80
WIRE 2704 80 2592 80
WIRE 2768 80 2704 80
WIRE 1936 96 1888 96
WIRE 1056 128 1056 -64
WIRE 2032 128 2032 -64
WIRE 2032 128 1984 128
WIRE 1712 160 1712 96
WIRE 1856 160 1712 160
WIRE 1888 160 1888 96
WIRE 1888 160 1856 160
WIRE 1360 176 1360 96
WIRE 1520 176 1520 16
WIRE 1520 176 1360 176
WIRE 2256 192 2256 80
WIRE 2768 192 2768 80
WIRE 1888 208 1888 160
WIRE 1360 224 1360 176
WIRE 1712 224 1712 160
WIRE 832 256 832 160
WIRE 832 256 704 256
WIRE 1440 272 1360 272
WIRE 1712 272 1648 272
WIRE 1888 288 1888 272
WIRE 1984 288 1984 176
WIRE 1984 288 1888 288
WIRE 2080 288 1984 288
WIRE 2176 288 2176 80
WIRE 2176 288 2080 288
WIRE 2256 288 2256 256
WIRE 1312 304 1216 304
WIRE 1840 304 1760 304
WIRE 2176 304 2176 288
WIRE 2768 320 2768 272
WIRE 704 336 704 256
WIRE 1840 336 1840 304
WIRE 1360 384 1360 320
WIRE 1440 384 1440 272
WIRE 1440 384 1360 384
WIRE 1520 384 1440 384
WIRE 1552 384 1520 384
WIRE 1648 384 1648 272
WIRE 1648 384 1552 384
WIRE 1712 384 1712 320
WIRE 1712 384 1648 384
WIRE 1056 400 1056 208
WIRE 1120 400 1056 400
WIRE 1168 400 1120 400
WIRE 2176 400 2176 368
WIRE 832 432 832 256
WIRE 1056 432 1056 400
WIRE 1520 432 1520 384
WIRE 1984 432 1984 288
WIRE 1056 480 976 480
WIRE 1584 480 1520 480
WIRE 2032 480 1984 480
WIRE 1168 512 1168 400
WIRE 1168 512 1104 512
WIRE 1408 512 1168 512
WIRE 1472 512 1408 512
WIRE 1936 512 1760 512
WIRE 1408 576 1408 512
WIRE 1760 576 1760 512
WIRE 1760 576 1408 576
WIRE 832 624 832 512
WIRE 976 624 976 480
WIRE 976 624 832 624
WIRE 1056 624 1056 528
WIRE 1056 624 976 624
WIRE 1376 624 1056 624
WIRE 1520 624 1520 528
WIRE 1520 624 1376 624
WIRE 1584 624 1584 480
WIRE 1584 624 1520 624
WIRE 1984 624 1984 528
WIRE 1984 624 1584 624
WIRE 2032 624 2032 480
WIRE 2032 624 1984 624
WIRE 1216 736 1216 304
WIRE 2448 736 2448 80
WIRE 2448 736 1216 736
SYMBOL voltage -80 80 R0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL current 432 96 R0
WINDOW 123 0 0 Left 2
WINDOW 39 27 84 Left 2
WINDOW 3 40 43 Left 2
SYMATTR SpiceLine load
SYMATTR InstName I1
SYMATTR Value {iload}
SYMBOL LTC1844-2.8 224 160 R0
SYMATTR InstName U2
SYMBOL nmos4 1312 224 R0
WINDOW 123 56 100 Left 2
SYMATTR Value2 l=1u w=10u
SYMATTR InstName Md1
SYMATTR Value NMOS-SH
SYMBOL voltage 832 416 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName VSS
SYMATTR Value 1.5
SYMBOL nmos4 1760 224 M0
WINDOW 123 56 100 Left 2
SYMATTR Value2 l=1u w=10u
SYMATTR InstName Md2
SYMATTR Value NMOS-SH
SYMBOL nmos4 1472 432 R0
WINDOW 123 56 100 Left 2
SYMATTR Value2 l=1u w=10u
SYMATTR InstName Mtail
SYMATTR Value NMOS-SH
SYMBOL pmos4 1664 96 M180
WINDOW 123 56 100 Left 2
SYMATTR Value2 l=1u w=10u
SYMATTR InstName Mp2
SYMATTR Value PMOS-SH
SYMBOL pmos4 1408 96 R180
WINDOW 123 56 100 Left 2
SYMATTR Value2 l=1u w=10u
SYMATTR InstName Mp1
SYMATTR Value PMOS-SH
SYMBOL nmos4 1104 432 M0
WINDOW 123 56 100 Left 2
SYMATTR Value2 l=1u w=10u
SYMATTR InstName Mbias
SYMATTR Value NMOS-SH
SYMBOL res 1040 112 R0
SYMATTR InstName R1
SYMATTR Value 20k
SYMBOL voltage 832 64 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName VDD
SYMATTR Value 1.5
SYMBOL voltage 2768 176 R0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value2 AC 1
SYMATTR InstName VCM
SYMATTR Value PWL(0 0 10n 0 11n 10m)
SYMBOL cap 2240 192 R0
SYMATTR InstName C1
SYMATTR Value 0.5p
SYMBOL res 2304 96 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value 10Meg
SYMBOL res 2496 96 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R3
SYMATTR Value 2.5Meg
SYMBOL cap 2160 304 R0
SYMATTR InstName C2
SYMATTR Value 0.5p
SYMBOL pmos4 1936 176 M180
WINDOW 123 56 100 Left 2
SYMATTR Value2 l=1u w=100u
SYMATTR InstName Mp3
SYMATTR Value PMOS-SH
SYMBOL nmos4 1936 432 R0
WINDOW 123 56 100 Left 2
SYMATTR Value2 l=1u w=10u
SYMATTR InstName Mtail1
SYMATTR Value NMOS-SH
SYMBOL cap 1872 208 R0
SYMATTR InstName C3
SYMATTR Value 2p
FLAG 224 304 0
FLAG -80 192 0
FLAG 432 192 0
FLAG 432 80 OUT
FLAG -80 80 IN
FLAG 704 336 0
FLAG 2768 320 0
FLAG 2256 288 0
FLAG 1552 384 vs
FLAG 1120 400 vgatebias
FLAG 1552 16 vgatep
FLAG 1472 -64 VDD
FLAG 1376 624 -VSS
FLAG 2176 400 0
FLAG 1840 336 0
FLAG 2080 288 vout
FLAG 1856 160 vincs
FLAG 2704 80 vin
TEXT 592 96 Left 2 !.dc v1 5 2 10m
TEXT 592 184 Left 2 !.measure DC vdrop WHEN V(out)=2.7\n.measure DC dropout param Vdrop-2.7
TEXT 592 136 Left 2 !.param iload=150m
TEXT -1200 -240 Left 2 !;op
TEXT -1192 -168 Left 2 !;.ac oct 100 10 1000MEG
TEXT -1192 -136 Left 2 !.tran 2u
TEXT -1200 -304 Left 2 !.model PMOS-SH pmos (Kp=55u Vto=-0.71 lambda=0.16 lambda=0.16 gamma=0.75 phi=0.7 TOX=8n CGSO=0.2f CGBO=0.2f CGDO=0.2f CJ=1.5m CJSW=0.5n)
TEXT -1200 -272 Left 2 !.model NMOS-SH nmos (Kp=190u Vto=0.57  lambda=0.16 lambda=0.16 gamma=0.5 phi=0.7 TOX=8n CGSO=0.2f CGBO=0.2f CGDO=0.2f CJ=1m CJSW=0.4n)