LTC6803-2 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC6803-2' PDF : 40 Pages View PDF
LTC6803-2/LTC6803-4
APPLICATIONS INFORMATION
SUPPLY DECOUPLING IF BATTERY-STACK POWERED
As shown in Figure 21, the LTC6803-4 can have filtering
on both V+ and V–, so differential bypassing to the cell
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–, additional Schottky
diodes are needed to prevent ESD-induced reverse-supply
(substrate) currents to flow.
ADVANTAGES OF KELVIN CONNECTION ON C0
The V– trace resistance can cause an observable voltage
drop between the negative end of the bottom battery
cell and V– pin of LTC6803. This voltage drop will add to
the measurement error of the bottom cell voltage. The
LTC6803‑4 separates C0 from V–, allowing Kelvin con-
nection on C0 as shown in Figure 22. Voltage drop on the
V– trace will not affect the bottom cell voltage measure-
ment. The Kelvin connection will also allow RC filtering
on V– as shown in Figure 21.
BLM31PG330SN1L
CELLGROUP+
100Ω
V+
CMHZ5265B
CELLGROUP–
BAT46W
LTC6803-2 Configuration
100nF
V–
680324 F21
BLM31PG330SN1L
CELLGROUP+
100Ω
V+
CMHZ5265B
CELLGROUP–
100Ω
100nF
V–
LTC6803-4 Configuration
Figure 21. Supply Decoupling
+
+ BATTERY
STACK
+
LTC6803-4
+
C1
C0
R
V–
ISUPPLY
68034 F20
Figure 22. Kelvin Connection on C0 Improving
Bottom Cell Voltage Measurement Accuracy
680324f
35
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