ltc6803g-4 Linear Technology Corporation, ltc6803g-4 Datasheet - Page 36

• Manufacturer Part Number: ltc6803g-4
• Description: Ltc6803-2/ltc6803-4 - Multicell Battery Stack Monitor
• Manufacturer: Linear Technology Corporation

LTC6803-2/LTC6803-4
APPLICATIONS INFORMATION
HARDWARE SHUTDOWN
To completely shut down the LTC6803 a PMOS switch can
be connected to V
power supply. Figure 23 shows an example of a switched
V
1.8V, no current will flow through the stacked MMBTA42s
and the 1M resistors. TP0610Ks will be completely shut
off. If SHDN > 2.5V, M7 will be turned on and then all
TP0610Ks will be turned on.
36
+
. The breakdown voltage of DZ4 is about 1.8V. If SHDN <
+
, or, V
+
can be driven from an isolated
Figure 23. Hardware Shutdown Circuit Reduces Total Supply
Current of LTC6803-4 to About 0µA
LTC6803-4
LTC6803-4
LTC6803-4
IC #3
IC #2
IC #1
C12
C12
C12
V
C0
V
V
C0
V
V
C0
V
+
–
+
–
+
–
TP0610K
TP0610K
TP0610K
PCB LAYOUT CONSIDERATIONS
The V
capacitor for best performance. The LTC6803 is capable of
operation with as much as 55V between V
should be taken on the PCB layout to maintain physical
separation of traces at different potentials. The pinout
of the LTC6803 was chosen to facilitate this physical
separation. There is no more than 5.5V between any two
adjacent pins. The package body is used to separate the
highest voltage (e.g., 43.2V) from the lowest voltage (0V).
DZ1
15V
DZ3
15V
DZ2
15V
REG
1M
1M
1M
50k
D1
D2
DZ4
1.8V
SHDN
680324 F23
and V
+
+
+
+
+
+
+
+
+
REF
DZ1, DZ2, DZ3: MMSZ5245B
DZ4: MMSZ4678T1
ALL NPN: MMBTA42
ALL PN: RS07J
pins should be bypassed with a 1µF
+
and V
–
. Care
680324f