LTC3300-2
Addressable High Efficiency
Bidirectional Multicell
Battery Balancer
FEATURES
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.
n
Bidirectional Synchronous Flyback Balancing
of Up to 6 Li-Ion or LiFePO Cells in Series
4
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
Up to 92% Charge Transfer Efficiency
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
LTC3300-2hasanindividuallyaddressableserialinterface,
allowing up to 32 LTC3300-2 devices to interface to one
control processor.
n
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
Fault protection features include readback capability, cy-
clic redundancy check (CRC) error detection, maximum
on-time volt-second clamps, and overvoltage shutoffs.
48-Lead Exposed Pad QFN and LQFP Packages
APPLICATIONS
n
Electric Vehicles/Plug-in HEVs
The related LTC3300-1 offers a serial interface that allows
theserialportsofmultipleLTC3300-1devicestobedaisy-
chained without opto-couplers or isolators.
n
High Power UPS/Grid Energy Storage Systems
n
General Purpose Multicell Battery Stacks
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and isoSPI
is a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
TYPICAL APPLICATION
High Efficiency Bidirectional Balancing
NEXT CELL ABOVE
CHARGE
Balancer Efficiency
+
SUPPLY
CHARGE
RETURN
DISCHARGE
CELL 12
LTC3300-2
100
(I
1-6)
CHARGE
4
5
DC2064A DEMO BOARD
(I
1-6)
ISOLATOR
I
V
= I
= 2.5A
CHARGE DISCHARGE
= 3.6V
CELL
+
+
ADDRESS n + 1
CELL 7
CELL 6
95
90
85
80
•
CHARGE
DISCHARGE
CHARGE
RETURN
I
DISCHARGE
4
•
4
SERIAL I/O
LTC3300-2
•
6
8
10
12
+
CHARGE
SUPPLY
I
4
CHARGE
CELL 1
NUMBER OF CELLS (SECONDARY SIDE)
33001 TA01b
•
4
5
ISOLATOR
ADDRESS n
33002 TA01a
NEXT CELL BELOW
33002f
1
For more information www.linear.com/LTC3300-2
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