ltc6803g-4 Linear Technology Corporation, ltc6803g-4 Datasheet - Page 35

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

APPLICATIONS INFORMATION
SUPPLY DECOUPLING IF BATTERY-STACK POWERED
As shown in Figure 21, the LTC6803-4 can have filtering
on both V
group potentials is recommended. The Zener suppresses
overvoltages from reaching the IC supply pins. A small
ferrite-bead inductor provides protection for the Zener, par-
ticularly from energetic ESD strikes. Since the LTC6803-2
cannot have a series resistance to V
diodes are needed to prevent ESD-induced reverse-supply
(substrate) currents to flow.
+
and V
–
, so differential bypassing to the cell
CELLGROUP
CELLGROUP
CELLGROUP
CELLGROUP
–
, additional Schottky
Figure 22. Kelvin Connection on C0 Improving
Bottom Cell Voltage Measurement Accuracy
+
–
+
–
BLM31PG330SN1L
BLM31PG330SN1L
CMHZ5265B
CMHZ5265B
Figure 21. Supply Decoupling
+
+
+
+
BATTERY
STACK
LTC6803-2 Configuration
LTC6803-4 Configuration
I
SUPPLY
R
100
100
C1
C0
V
ADVANTAGES OF KELVIN CONNECTION ON C0
The V
drop between the negative end of the bottom battery
cell and V
the measurement error of the bottom cell voltage. The
LTC6803-4 separates C0 from V
nection on C0 as shown in Figure 22. Voltage drop on the
V
ment. The Kelvin connection will also allow RC filtering
on V
LTC6803-4
–
–
BAT46W
trace will not affect the bottom cell voltage measure-
68034 F20
–
–
100nF
as shown in Figure 21.
trace resistance can cause an observable voltage
V
V
+
–
–
100
pin of LTC6803. This voltage drop will add to
LTC6803-2/LTC6803-4
680324 F21
100nF
V
V
+
–
–
, allowing Kelvin con-
35
680324f