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.
n
n
n
n
n
n
n
n
Bidirectional Synchronous Flyback Balancing
of Up to 6 Li-Ion or LiFePO
4
Cells in Series
Up to 10A Balancing Current (Set by External
Components)
Bidirectional Architecture Minimizes Balancing
Time and Power Dissipation
Up to 92% Charge Transfer Efficiency
Stackable Architecture Enables >1000V Systems
Uses Simple 2-Winding Transformers
1MHz Daisy-Chainable Serial Interface with 4-Bit
CRC Packet Error Checking
High Noise Margin Serial Communication
Numerous Fault Protection Features
48-Lead Exposed Pad QFN and LQFP Packages
APPLICATIONS
n
n
n
Electric Vehicles/Plug-in HEVs
High Power UPS/Grid Energy Storage Systems
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
SUPPLY
(I
CHARGE
1-6)
CHARGE
RETURN
(I
DISCHARGE
1-6)
+
CELL 12
LTC3300-1
3
3
SERIAL
DATA OUT
TO LTC3300-1
ABOVE
Balancer Efficiency
100
CHARGE TRANSFER EFFICIENCY (%)
DC2064A DEMO BOARD
I
CHARGE
= I
DISCHARGE
= 2.5A
V
CELL
= 3.6V
CHARGE
90
DISCHARGE
+
•
CHARGE
RETURN
I
DISCHARGE
CELL 7
CELL 6
3
+
95
•
•
CHARGE
SUPPLY
I
CHARGE
LTC3300-1
85
+
CELL 1
3
•
SERIAL
DATA IN
FROM
LTC3300-1
BELOW
80
6
8
10
12
NUMBER OF CELLS (SECONDARY SIDE)
33001 TA01b
33001 TA01a
NEXT CELL BELOW
33001f
For more information
www.linear.com/product/LTC3300-1
1
LTC3300-1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Total Supply Voltage (C6 to V
–
).................................36V
Input Voltage (Relative to V
–
)
C1 ........................................................... –0.3V to 6V
I1P ....................................................... –0.3V to 0.3V
I1S, I2S, I3S, I4S, I5S, I6S .................... –0.3V to 0.3V
CSBI, SCKI, SDI ....................................... –0.3V to 6V
CSBO, SCKO, SDOI ................................ –0.3V to 36V
V
REG
, SDO ............................................... –0.3V to 6V
RTONP, RTONS ...........–0.3V to Min[V
REG
+ 0.3V, 6V]
TOS, V
MODE
, CTRL,
BOOST, WDT .............. –0.3V to Min[V
REG
+ 0.3V, 6V]
Voltage Between Pins
Cn to Cn-1* .............................................. –0.3V to 6V
InP to Cn-1* .......................................... –0.3V to 0.3V
BOOST
+
to C6 .......................................... –0.3V to 6V
CSBO to SCKO, CSBO to SDOI,
SCKO to SDOI ....................................... –0.3V to 0.3V
SDO Current ...........................................................10mA
G1P, GnP, G1S, GnS, BOOST
–
Current............... ±200mA
Operating Junction Temperature Range (Notes 2, 7)
LTC3300I-1 ........................................ –40°C to 125°C
LTC3300H-1 ....................................... –40°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
*n = 2 to 6
PIN CONFIGURATION
48 V
REG
47 TOS
46 V
MODE
45 CSBO
44 SCKO
43 SDOI
42 BOOST
41 BOOST
–
40 BOOST
+
39 C6
38 G6P
37 I6P
V
REG
TOS
V
MODE
CSBO
SCKO
SDOI
BOOST
BOOST
–
BOOST
+
C6
G6P
I6P
36 C5
35 G5P
34 I5P
33 C4
32 G4P
31 I4P
30 C3
29 G3P
28 I3P
27 C2
26 G2P
25 I2P
G6S 1
I6S 2
G5S 3
I5S 4
G4S 5
I4S 6
G3S 7
I3S 8
G2S 9
I2S 10
G1S 11
I1S 12
48
47
46
45
44
43
42
41
40
39
38
37
TOP VIEW
TOP VIEW
G6S 1
I6S 2
G5S 3
I5S 4
G4S 5
I4S 6
G3S 7
I3S 8
G2S 9
I2S 10
G1S 11
I1S 12
49
V
–
49
V
–
36
35
34
33
32
31
30
29
28
27
26
25
C5
G5P
I5P
C4
G4P
I4P
C3
G3P
I3P
C2
G2P
I2P
RTONS 13
RTONP 14
CTRL 15
CSBI 16
SCKI 17
SDI 18
SDO 19
WDT 20
V
–
21
I1P 22
G1P 23
C1 24
UK PACKAGE
48-LEAD (7mm
×
7mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 34°C/W,
θ
JC
= 3°C/W
EXPOSED PAD (PIN 49) IS V
–
, MUST BE SOLDERED TO PCB
LXE PACKAGE
48-LEAD (7mm
×
7mm) PLASTIC LQFP
T
JMAX
= 150°C,
θ
JA
= 20.46°C/W,
θ
JC
= 3.68°C/W
EXPOSED PAD (PIN 49) IS V
–
, MUST BE SOLDERED TO PCB
RTONS 13
RTONP 14
CTRL 15
CSBI 16
SCKI 17
SDI 18
SDO 19
WDT 20
V
–
21
I1P 22
G1P 23
C1 24
33001f
2
For more information
www.linear.com/product/LTC3300-1
LTC3300-1
ORDER INFORMATION
LEAD FREE FINISH
LTC3300IUK-1#PBF
LTC3300HUK-1#PBF
LTC3300ILXE-1#PBF
LTC3300HLXE-1#PBF
TAPE AND REEL
LTC3300IUK-1#TRPBF
LTC3300HUK-1#TRPBF
LTC3300ILXE-1#TRPBF
LTC3300HLXE-1#TRPBF
PART MARKING*
LTC3300UK-1
LTC3300UK-1
LTC3300LXE-1
LTC3300LXE-1
PACKAGE DESCRIPTION
48-Lead (7mm
×
7mm) Plastic QFN
48-Lead (7mm
×
7mm) Plastic QFN
48-Lead (7mm
×
7mm) Plastic eLQFP
48-Lead (7mm
×
7mm) Plastic eLQFP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 150°C
–40°C to 125°C
–40°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
DC Specifications
Supply Current When Not
I
Q_SD
Balancing (Post Suspend or Pre
First Execute)
Supply Current When Balancing
I
Q_ACTIVE
(Note 3)
The
l
denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C. (Note 2) BOOST
+
= 25.2V, C6 = 21.6V, C5 = 18V, C4 = 14.4V,
C3 = 10.8V, C2 = 7.2V, C1 = 3.6V, V
–
= 0V, unless otherwise noted.
CONDITIONS
Measured at C1, C2, C3, C4, C5
Measured at C6
Measured at BOOST
+
Balancing C1 Only (Note 4 for V
–
, C2, C6)
Measured at C1
Measured at C2, C3, C4, C5
Measured at C6
Measured at BOOST
+
Balancing C2 Only (Note 4 for C1, C3, C6)
Measured at C1
Measured at C2
Measured at C3, C4, C5
Measured at C6
Measured at BOOST
+
Balancing C3 Only (Note 4 for C2, C4, C6)
Measured at C1, C4, C5
Measured at C2
Measured at C3
Measured at C6
Measured at BOOST
+
Balancing C4 Only (Note 4 for C3, C5, C6)
Measured at C1, C2, C5
Measured at C3
Measured at C4
Measured at C6
Measured at BOOST
+
Balancing C5 Only (Note 4 for C4, C6)
Measured at C1, C2, C3
Measured at C4
Measured at C5
Measured at C6
Measured at BOOST
+
Balancing C6 Only (Note 4 for C5, C6, BOOST
+
)
Measured at C1, C2, C3, C4
Measured at C5
Measured at C6
Measured at BOOST
+
(BOOST = V
–
)
Measured at BOOST
+
(BOOST = V
REG
)
MIN
TYP
0
16
0
250
70
560
0
–105
–70
250
70
560
0
70
–70
250
560
0
70
–70
250
560
0
70
–70
250
560
0
70
–70
740
60
0
MAX
1
25
10
375
105
840
10
375
105
840
10
105
375
840
10
105
375
840
10
105
375
840
10
105
1110
90
10
UNITS
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
33001f
7
–105
–105
–105
–105
For more information
www.linear.com/product/LTC3300-1
3
LTC3300-1
ELECTRICAL CHARACTERISTICS
SYMBOL
I
Q_EXTRA
V
CELL|MIN
PARAMETER
Supply Current Extra
(Serial I/O in Current Mode)
Minimum Cell Voltage (Rising)
Required for Primary Gate Drive
The
l
denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C. (Note 2) BOOST
+
= 25.2V, C6 = 21.6V, C5 = 18V, C4 = 14.4V,
C3 = 10.8V, C2 = 7.2V, C1 = 3.6V, V
–
= 0V, unless otherwise noted.
CONDITIONS
Additional Current Measured at C6, V
MODE
= V
–
(CSBI Logic Low, SCKI and SDI Both Logic High;
Refer to I
IL1
, I
IH1
, I
OH1
, I
OL1
Specs)
Cn to Cn
– 1
Voltage to Balance Cn,
n
= 2 to 6
C1 Voltage to Balance C1
Cn + 1 to Cn Voltage to Balance Cn,
n
= 1 to 5
BOOST
+
to C6 Voltage to Balance C6, BOOST = V
–
C1, Cn to Cn
– 1
Voltage to Balance Any Cell,
n
= 2 to 6
MIN
TYP
3.75
2
2
2
2
70
5
0.5
l
MAX
UNITS
mA
V
V
V
V
mV
V
V
V
l
l
l
l
1.8
1.8
1.8
1.8
4.7
2.2
2.2
2.2
2.2
5.3
V
CELL|MIN(HYST)
V
CELL|MIN
Comparator Hysteresis
Maximum Cell Voltage (Rising)
V
CELL|MAX
Before Disabling Balancing
V
CELL|MAX(HYST)
V
CELL|MAX
Comparator Hysteresis
V
CELL|RECONNECT
Maximum Cell Voltage (Falling) to
Re-Enable Balancing
V
REG
Regulator Pin Voltage
V
REG
Voltage (Rising) for
V
REG|POR
Power-On Reset
Minimum V
REG
Voltage (Falling)
V
REG|MIN
for Secondary Gate Drive
Regulator Pin Short Circuit Current
I
REG_SC
Limit
RTONP Servo Voltage
V
RTONP
RTONS Servo Voltage
V
RTONS
WDT Pin Current, Balancing
I
WDT_RISING
WDT Pin Current as a Percentage
I
WDT_FALLING
of I
WDT_RISING
, Secondary OV
Primary Winding Peak Current
V
PEAK_P
Sense Voltage
V
PEAK_P
Matching (All 6)
Secondary Winding Peak Current
V
PEAK_S
Sense Voltage
V
PEAK_S
Matching (All 6)
Primary Winding Zero Current
V
ZERO_P
Sense Voltage (Note 5)
V
ZERO_P
Matching (All 6)
Normalized to Mid-Range V
PEAK_P
Secondary Winding Zero Current
V
ZERO_S
Sense Voltage (Note 5)
V
ZERO_S
Matching (All 6)
Normalized to Mid-Range V
PEAK_S
BOOST
–
Pin Pull-Down R
ON
R
BOOST_L
BOOST
–
Pin Pull-Up R
ON
R
BOOST_H
Thermal Shutdown Threshold
T
SD
(Note 7)
Thermal Shutdown Hysteresis
T
HYS
Timing Specifications
Primary Winding Gate Drive Rise
t
r_P
Time (10% to 90%)
Primary Winding Gate Drive Fall
t
f_P
Time (90% to 10%)
l
4.25
4.4
4.8
4.0
5.2
9V ≤ C6 ≤ 36V, 0mA ≤ I
LOAD
≤ 20mA
l
V
V
V
V
REG
Voltage to Balance Cn,
n
= 1 to 6
V
REG
= 0V
R
RTONP
= 20kΩ
R
RTONS
= 15kΩ
R
TONS
= 15kΩ, WDT = 0.5V
R
TONS
= 15kΩ, WDT = 2V
I1P
InP to Cn
– 1, n
= 2 to 6
±[(Max – Min)/(Max + Min)] • 100%
I1S
InS to Cn
– 1, n
= 2 to 6, CTRL = 0 Only
±[(Max – Min)/(Max + Min)] • 100%
I1P
InP to Cn
– 1, n
= 2 to 6
±{[(Max – Min)/2]/(V
PEAK_P|MIDRANGE
)} • 100%
(Note 6)
I1S
InS to Cn – 1,
n
= 2 to 6, CTRL = 0 Only
±{[(Max – Min)/2]/(V
PEAK_S|MIDRANGE
)} • 100%
(Note 6)
Measured at 100mA Into Pin, BOOST = V
REG
Measured at 100mA Out of Pin, BOOST = V
REG
Rising Temperature
l
3.8
55
mA
1.242
1.242
88
90
55
55
±5
55
55
±3
3
3
±5
–2
–2
±3
V
V
µA
%
mV
mV
%
mV
mV
%
mV
mV
%
mV
mV
%
Ω
Ω
°C
°C
70
40
ns
ns
33001f
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
1.158
1.158
72
85
45
45
45
45
–7
–7
1.2
1.2
80
87.5
50
50
±1.7
50
50
±0.5
–2
–2
±1.7
–7
–7
±0.5
2.5
4
155
10
–12
–12
G1P Through G6P C
GATE
= 2500pF
,
G1P Through G6P C
GATE
= 2500pF
,
35
20
4
For more information
www.linear.com/product/LTC3300-1
LTC3300-1
ELECTRICAL CHARACTERISTICS
SYMBOL
t
r_S
PARAMETER
Secondary Winding Gate Drive
Rise Time (10% to 90%)
Secondary Winding Gate Drive Fall
t
f_S
Time (90% to 10%)
Primary Winding Switch Maximum
t
ONP|MAX
On-Time
t
ONP|MAX
Matching (All 6)
Secondary Winding Switch
t
ONS|MAX
Maximum On-Time
t
ONS|MAX
Matching (All 6)
Delayed Start Time After New/
t
DLY_START
Different Balance Command or
Recovery from Voltage/Temp Fault
Voltage Mode Timing Specifications
SDI Valid to SCKI Rising Setup
t
1
SDI Valid from SCKI Rising Hold
t
2
SCKI Low
t
3
SCKI High
t
4
CSBI Pulse Width
t
5
SCKI Rising to CSBI Rising
t
6
CSBI Falling to SCKI Rising
t
7
SCKI Falling to SDO Valid
t
8
Clock Frequency
f
CLK
Watchdog Timer Timeout Period
t
WD1
t
WD2
Watchdog Timer Reset Time
The
l
denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
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Electronics Design Contest
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