LTC3300-2_15 Datasheet, PDF (1/42 Pages) Linear Technology – Addressable High Efficiency Bidirectional Multicell Battery Balancer

FEATURES
n _{Bidirectional Synchronous Flyback Balancing}
of Up to 6 Li-Ion or LiFePO₄ Cells in Series
n _{Up to 10A Balancing Current (Set by Externals)}
n _{Integrates Seamlessly with the LTC680x Family of}
Multicell Battery Stack Monitors
n _{Bidirectional Architecture Minimizes Balancing}
Time and Power Dissipation
n _{Up to 92% Charge Transfer Efficiency}
n _{Stackable Architecture Enables >800V Systems}
n _{Uses Simple 2-Winding Transformers}
n _{1MHz Serial Interface with 4-Bit}
CRC Packet Error Checking
n _{Individually Addressable with 5-Bit Address}
n _{Numerous Fault Protection Features}
n _{48-Lead Exposed Pad QFN and LQFP Packages}
APPLICATIONS
n _{Electric Vehicles/Plug-in HEVs}
n _{High Power UPS/Grid Energy Storage Systems}
n _{General Purpose Multicell Battery Stacks}
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LTC3300-2
Addressable High Efficiency
Bidirectional Multicell
Battery Balancer
DESCRIPTION
The LTC^®3300-2 is a fault-protected controller IC for
transformer-based bidirectional active balancing of multi-
cell battery stacks. All associated gate drive circuitry,
precision current sensing, fault detection circuitry and a
robust serial interface with built-in watchdog timer are
integrated.
Each LTC3300-2 can balance up to 6 series-connected
battery cells with an input common mode voltage up to
36V. Charge from any selected cell can be transferred at
high efficiency to or from 12 or more adjacent cells. Each
LTC3300-2 has an individually addressable serial interface,
allowing up to 32 LTC3300-2 devices to interface to one
control processor.
Fault protection features include readback capability, cy-
clic redundancy check (CRC) error detection, maximum
on-time volt-second clamps, and overvoltage shutoffs.
The related LTC3300-1 offers a serial interface that allows
the serial ports of multiple LTC3300-1 devices to be daisy-
chained without opto-couplers or isolators.
TYPICAL APPLICATION
High Efficiency Bidirectional Balancing
NEXT CELL ABOVE
CHARGE
SUPPLY
(I_CHARGE 1-6)
CHARGE
RETURN
(I_DISCHARGE 1-6)
+
CELL 12 _LTC3300-2
4
ISOLATOR
+ _{CELL 7 ADDRESS n + 1}
5
•
CHARGE
RETURN
+ _IDISCHARGE
CELL 6
4
•
•
CHARGE
SUPPLY
I_CHARGE
•
+
CELL 1
NEXT CELL BELOW
LTC3300-2
4
5
ADDRESS n
33002 TA01a
ISOLATOR
4
SERIAL I/O
4
Balancer Efficiency
100
DC2064A DEMO BOARD
I_CHARGE = I_DISCHARGE = 2.5A
V_CELL = 3.6V
95
CHARGE
90
DISCHARGE
85
80
6
8
10
12
NUMBER OF CELLS (SECONDARY SIDE)
33001 TA01b
For more information www.linear.com/LTC3300-2
33002f
1