LTM4641
TYPICAL APPLICATIONS
12
10
8
6
4
2
U1 OUTPUT CURRENT
U2 OUTPUT CURRENT
U3 OUTPUT CURRENT
U4 OUTPUT CURRENT
0
–2
8
16
24
40
0
32
TOTAL OUTPUT CURRENT (A)
4641 F57
Figure 57: Current-Sharing Performance of Four Paralleled LTM4641. Figure 56 Circuit, Operating at 28VIN
FOR MORE INFORMATION ABOUT CONFIGURING STEP-DOWN BUCK
OPERATION
UP TO 32.8V
CONVERTERS AS BUCK-BOOST CONVERTERS, FOR GENERATING
IN
+
C
NEGATIVE V , SEE http://www.linear.com/docs/39881
IN(MLCC)
OUT
4.5V START-UP
C
IN(BULK)
10µF
50V
×4
50V
V
V
V
SW
ING INGP INH
V
INL
V
OUT
CROWBAR
f
SET
UVLO
HYST
FCB
LATCH
R
SET1A
+
V
8.2k
ORB
+
V
OSNS
LOCAL HIGH
FREQUENCY
DECOUPLING
U1
LTM4641
R
R
SET1B
8.2k
SET2
LOAD
D1
INTV
DRV
CC
2.46k
–
–
V
OSNS
CC
V
IOVRETRY
OVLO
ORB
TEMP
1V
REF
OVPGM
OTBH
RUN
PGOOD
100k
TRACK/SS
TMR COMP SGND GND
C
SS
C
OUT(MLCC)
10nF
47µF
10V
×4
V
OUT
–5.2V AT
UP TO 10A
D1: CENTRAL SEMI CMPSH1-4LE
SGND CONNECTS TO GND INTERNAL TO MODULE, KEEP SGND
ROUTES/PLANES SEPARATE FROM GND ON MOTHERBOARD
4641 F58
Figure 58. Negative Output Application. Delivering –5.2VOUT at Up to 10A, from Up to 32.8VIN. cf. Figure 59
V
IN
10V/DIV
HYST 2V/DIV
PGOOD 2V/DIV
V
OUT
2V/DIV
*
4641 F59
20ms/DIV
Figure 59. Pulsed Application of VIN. Figure 58 Circuit with 500Ω Load.
*Ultralow VF of D1 Minimizes VOUT Overshoot Upon Energization
4641f
53
Linear [ Linear ]
