LTC3300-1 Datasheet, PDF (1/44 Pages) Linear Technology – High Effciency 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 External}
Components)
n _{Bidirectional Architecture Minimizes Balancing}
Time and Power Dissipation
n _{Up to 92% Charge Transfer Efficiency}
n _{Stackable Architecture Enables >1000V Systems}
n _{Uses Simple 2-Winding Transformers}
n _{1MHz Daisy-Chainable Serial Interface with 4-Bit}
CRC Packet Error Checking
n _{High Noise Margin Serial Communication}
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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is a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
LTC3300-1
High Efficiency Bidirectional
Multicell Battery Balancer
DESCRIPTION
The LTC^®3300-1 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 LTC3300-1 can balance up to 6 series-connected bat-
tery 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. A unique
level-shifting SPI-compatible serial interface enables
multiple LTC3300-1 devices to be connected in series,
without opto-couplers or isolators, allowing for balancing
of every cell in a long string of series-connected batteries.
When multiple LTC3300-1 devices are connected in series
they can operate simultaneously, permitting all cells in
the stack to be balanced concurrently and independently.
Fault protection features include readback capability, cy-
clic redundancy check (CRC) error detection, maximum
on-time volt-second clamps, and overvoltage shutoffs.
TYPICAL APPLICATION
High Efficiency Bidirectional Balancing
NEXT CELL ABOVE
CHARGE
SUPPLY
(I_CHARGE 1-6)
CHARGE
RETURN
(I_DISCHARGE 1-6)
+
CELL 12 _LTC3300-1
3
3
+
CELL 7
•
CHARGE
RETURN
+ _IDISCHARGE
CELL 6
•
3
SERIAL
DATA OUT
TO LTC3300-1
ABOVE
Balancer Efficiency
100
DC2064A DEMO BOARD
I_CHARGE = I_DISCHARGE = 2.5A
V_CELL = 3.6V
95
CHARGE
90
DISCHARGE
•
CHARGE
SUPPLY
I_CHARGE ⁺ _{CELL 1}
•
LTC3300-1
SERIAL
3 ^{DATA IN}
FROM
LTC3300-1
BELOW
NEXT CELL BELOW
33001 TA01a
85
80
6
8
10
12
NUMBER OF CELLS (SECONDARY SIDE)
33001 TA01b
For more information www.linear.com/product/LTC3300-1
33001f
1