LTC3300-1
1
33001fb
For more information www.linear.com/LTC3300-1
APPLICATIONS
TYPICAL APPLICATION
FEATURES DESCRIPTION
High Efficiency Bidirectional
Multicell Battery Balancer
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 over
voltage shutoffs.
High Efficiency Bidirectional Balancing
Balancer Efficiency
n
Bidirectional Synchronous Flyback Balancing
of Up to 6 Li-Ion or LiFePO
4
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 >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
n
Electric Vehicles/Plug-in HEVs
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.
SERIAL
DATA OUT
ABOVE
SERIAL
DATA IN
FROM
LTC3300-1
BELOW
3
+
CELL 1
I
CHARGE
CHARGE
SUPPLY
CHARGE
SUPPLY
CHARGE
1-6)
33001 TA01a
LTC3300-1
LTC3300-1
3
3
3
•
•
+
CELL 6
+
CELL 7
+
CELL 12
I
DISCHARGE
CHARGE
RETURN
CHARGE
RETURN
(I
DISCHARGE
1-6)
•
•
NUMBER OF CELLS (SECONDARY SIDE)
6
80
CHARGE TRANSFER EFFICIENCY (%)
85
95
90
8 10
CHARGE
DISCHARGE
12
DC2064A DEMO BOARD
I
CHARGE
= I
DISCHARGE
= 2.5A
V
CELL
= 3.6V
