LTM4641
SIMPLIFIED BLOCK DIAGRAM
V
V
IN
OUT
V
INL
4V TO 38V
INTV
CC
(4.5V START-UP)
0.1µF
C
IN(MLCC)
1.3M
R
fSET
*
R
HYST
10k
HYST
UVLO
R
TUV
+
f
I
SET
ON
ENABLE
SWITCHING
ACTION
C
IN(BULK)
M
V
ING
HYST
R
BUV
MSP
V
15V
ZENER
INGP
POWER
CONTROL
V
INH
V
IN
2.2µF
M
M
TOP
0.8µH
SW
R
R
R
TOV
MOV
BOV
CONSTANT
ON-TIME
IOVRETRY
OVLO
PROTECTION
COMPARATORS
AND
V
OUT
V
OUT
VALLEY MODE
SYNCHRONOUS
BUCK
0.6V TO 6V
UP TO 10A
+
FAULT LATCHES
10µF
C
OUT(BULK)
CONTROLLER
1V
REF
BOT
C
OUT(MLCC)
3.48k
GND
TEMP
NTC
SGND
V
FB
TO E/A
OSC
OTBH
TMR
LATCH
FCB
C
C
TMR
FAST OUTPUT
OVERVOLTAGE
COMPARATOR
COMP
DRV
CC
CROWBAR
MCB
R
R
C
ENABLE
INTV
CC
PGOOD
TRACK/SS
1V
–
ORB
V
8.2k
–
8.2k
SET1B
V
OSNS
–
+
REF
SS
REF
INTERNAL
COMP
R
SET2
+
+
R
4µF
8.2k
8.2k
SET1A
V
OSNS
V
ORB
R
499k
1M
TOVPGM
OV
PGM
RSET1A 2•RSET1A
R
BOVPGM
C
VOUT = 0.6 1+
+
OVPGM
8.2kΩ
RSET2
RUN
USE R
= R
≤8.2k
SET1B
SET1A
R
SET2
R
SET2
REQUIRED FOR V
> 1.2V
OUT
OUT
NOT NECESSARY FOR V
≤ 1.2V
4641 F01
DASHED BOXES INDICATE OPTIONAL COMPONENTS
*R REQUIRED FOR CERTAIN V /V COMBINATIONS
fSET IN OUT
SEE APPLICATIONS INFORMATION SECTION
SGND CONNECTS TO GND INTERNAL TO MODULE, KEEP SGND
ROUTES/PLANES SEPARATE FROM GND, ON MOTHERBOARD
Figure 1. Siꢃplified Block Diagraꢃ. cf. Functional Block Diagraꢃ in Appendiꢂ A, Figure 62
DECOUPLING REQUIREMENTS
SYꢁBOL
PARAꢁETER
CONDITIONS
ꢁIN
TYP
ꢁAX
UNITS
C
C
+
External Input Capacitor Requirement
20
μF
I
= 10A, 2 × 10μF or 4 × 4.7μF
IN(MLCC)
IN(BULK)
OUT
C
C
+
External Output Capacitor Requirement
300
μF
I
= 10A, 3 × 100μF or 6 × 47μF
OUT(MLCC)
OUT(BULK)
OUT
4641f
15
Linear [ Linear ]
