LTM4641
TYPICAL APPLICATIONS
LDO Losses in the LTM4641 Can Be Greatly Reduced When an Auxilliary ~5V to 6V Source (V ) Is Available to
AUX
V
AUX
Drive DRV Through a Schottky Diode as Shown (D1c). When LTM4641 Is Configured to Produce ~5V
to 6V ,
C
C
O
U
T
OUT
its Output Can Be V . Provide a Current Path to V from V and INTV /DRV Whenever Overdriving INTV /DRV
AUX
INL
IN
CC
CC
CC
CC
with V –Accomplished Here with D1a and D1b
AUX
V
IN
8.5V TO 38V
(10V START-UP)
+
C
IN(MLCC)
10µF
C
IN(BULK)
50V
a
c
~5V
OUT
V
V
V
INH
SW
×2
ING INGP
V
TO 6V
OUT
OUT
D1
V
f
INL
C
C
OUT(MLCC)
OUT(BULK)
UP TO 10A
C
0.1µF
50V
VINL
47µF
10V
×2
150µF
10V
b
R
CROWBAR
TUV
294k
SET
LATCH
UVLO
+
R
SET1A
8.2k
V
ORB
R
R
HYST
1M
BUV
15.8k
+
V
OSNS
HYST
FCB
LTM4641
R
R
SET2
~2.05k TO 2.61k
SET1B
8.2k
LOAD
D2
–
V
OSNS
INTV
CC
–
V
DRV
ORB
TEMP
1V
CC
C
IOVRETRY
OVLO
DRVCC
2.2µF
REF
OVPGM
OTBH
PGOOD
D1, D2: CENTRAL SEMI CMKSH2-4LR
SOT-363 PACKAGE
RUN
TRACK/SS
TMR
COMP SGND GND
4641 F51
C
SS
47nF
SGND CONNECTS TO GND INTERNAL TO MODULE, KEEP SGND
ROUTES/PLANES SEPARATE FROM GND ON MOTHERBOARD
Figure 51. Over-Driving INTVCC/DRVCC to Reduce VINL-to-INTVCC Linear Regulator Losses (cf. Figures 52 to 54)
Figure 52. Thermal Image of U1 from Figure 51 Circuit.
Delivering 5VOUT at 10A from 36VIN, with INTVCC Connected
to DRVCC and D1c = Open and D2 = Open. TA = 25°C, Bench
Testing, No Airflow
Figure 54. Thermal Image of U1 from Figure 51 Circuit.
Delivering 5VOUT at 10A from 36VIN, with 5VOUT Feeding
INTVCC/DRVCC Through D1c Diode. TA = 25°C, Bench Testing,
No Airflow
Figure 55. Thermal Image of U1 from Figure 51 Circuit.
Delivering 6VOUT at 10A from 36VIN, with 6VOUT Feeding
INTVCC/DRVCC Through D1c Diode. TA = 25°C, Bench Testing,
No Airflow
Figure 53. Thermal Image of U1 from Figure 51 Circuit.
Delivering 6VOUT at 10A from 36VIN, with INTVCC Connected
to DRVCC and D1c = Open and D2 = Open. TA = 25°C, Bench
Testing, No Airflow
4641f
51
Linear [ Linear ]
