LTM4641
APPLICATIONS INFORMATION—POWER SUPPLY FEATURES
V
IN
4V TO 38V
(4.5V START-UP)
C
+
INM(MLCC)
C
INM(BULK)
50V
10µF
50V
×2
V
V
V
SW
V
ING INGP
INH
OUT_MASTER
1.8V
V
INL
V
OUT
C
OUTM(MLCC)
UP TO 10A
R
MfSET
2M
100µF
6.3V
×3
CROWBAR
f
SET
LATCH
C
FFMA
220pF
+
1
V
ORB
UVLO
HYST
FCB
R
SETM1A
8.2k
U1
LTM4641
+
V
OSNS
LOCAL HIGH
FREQUENCY
DECOUPLING
1
1
R
R
SETM2
SETM1B
8.2k
LOAD
INTV
DRV
CC
16.4k
–
–
V
OSNS
CC
C
V
FFMB
220pF
IOVRETRY
OVLO
ORB
TEMP
1V
REF
OVPGM
OTBH
RUN
RUN
PGOOD
U1 V
RAMP TIME
TRACK/SS
TMR COMP SGND GND
OUT
t
= 0.6ms/nF • C
SOFTSTART
SS
C
SS
4.7nF
(C IN nF)
SS
1
1
C
+
INSC(MLCC)
C
INSC(BULK)
50V
COINCEDENT TRACKING
10µF
50V
×2
OF THE 1.8V RAIL
V
V
V
SW
V
ING INGP
INH
OUT_SLAVE_C
V
INL
V
1V
OUT
C
OUTSC(MLCC)
R
UP TO 10A
CfSET
680k
100µF
6.3V
×4
CROWBAR
f
SET
LATCH
+
2
V
ORB
UVLO
HYST
FCB
R
SETC1A
U2
LTM4641
5.49k
+
V
OSNS
LOCAL HIGH
FREQUENCY
DECOUPLING
2
2
R
5.49k
SETC1B
V
LOAD
INTV
OUT_MASTER
CC
–
–
V
DRV
OSNS
CC
R
TAC
V
IOVRETRY
OVLO
ORB
6.65k
TEMP
1V
REF
R
TBC
OVPGM
OTBH
10k
RUN
RUN
PGOOD
2
TRACK/SS
TMR COMP SGND GND
2
C
+
INSR(MLCC)
C
INSR(BULK)
50V
RATIOMETRIC TRACKING
OF THE 1.8V RAIL
10µF
50V
×2
V
V
V
SW
ING INGP INH
V
OUT_SLAVE_R
V
INL
V
OUT
1.5V
C
OUTSR(MLCC)
R
UP TO 10A
RfSET
1M
100µF
6.3V
×4
CROWBAR
f
SET
LATCH
C
FFRA
220pF
+
3
V
ORB
UVLO
HYST
FCB
R
SETR1A
8.2k
U3
LTM4641
+
V
OSNS
LOCAL HIGH
FREQUENCY
DECOUPLING
3
3
R
R
SETR2 SETR1B
33.2k
8.2k
V
LOAD
INTV
OUT_MASTER
CC
–
–
V
DRV
OSNS
CC
R
TAR
C
V
FFRB
IOVRETRY
OVLO
ORB
20k
220pF
TEMP
1V
REF
R
TBR
OVPGM
OTBH
10k
RUN
RUN
PGOOD
3
TRACK/SS
TMR COMP SGND GND
4641 F07
3
U1, U2 AND U3 SGND (
) CONNECT TO GND INTERNAL TO THEIR RESPECTIVE MODULES.
,
,
3
1
2
KEEP SGND ROUTES/PLANES OF MODULES SEPARATE FROM EACH OTHER AND FROM GND ON MOTHERBOARD
Figure 7. Eꢂaꢃples of LTꢁ4641 Perforꢃing Coincident and Ratioꢃetric Rail-Tracking. cf. Figure 8 Waveforꢃs
4641f
26
Linear [ Linear ]
