LTC3305 Balancer Datasheet

LTC3305 Datasheet PDF, Equivalent


Part Number

LTC3305

Description

Lead-Acid Battery Balancer

Manufacture

Linear

Total Page 28 Pages
Datasheet
Download LTC3305 Datasheet


LTC3305
LTC3305
Lead-Acid Battery Balancer
FEATURES
n Single IC Balances Up to Four 12V Lead-Acid
Batteries in Series
n All NFET Design
n Stackable to Balance Larger Series Battery Packs
n Standalone Balancing Operation: Requires No
External μP or Additional Control Circuitry
n Balancing Current Limited by External PTC Thermistor
n Continuous Mode and Timer Mode
n Programmable UV and OV Fault Thresholds
n Programmable Termination Time and Termination
Voltage
n Thermally Enhanced 38-Lead TSSOP Package
APPLICATIONS
n Telecom Backup Systems
n Home Battery Powered Backup Systems
n Industrial Electric Vehicles
n Energy Storage Systems (ESS)
n Medical Equipment
DESCRIPTION
The LTC®3305 balances up to 4 lead-acid batteries
connected in series. It is intended to be used in conjunction
with a separate pre-existing battery charger as part of a
high performance battery system. All voltage monitoring,
gate drive, and fault detection circuitry is integrated.
The LTC3305 employs an auxiliary battery or an alternative
storage cell to transfer charge to or from each individual
battery in the stack. A mode pin provides two operating
modes, timer mode and continuous mode. In timer mode,
once the balancing operation is completed, the LTC3305
goes into a low power state for a programmed time and then
periodically rebalances the batteries. In continuous mode,
the balancing operation continues even after the batteries
are balanced to their programmed termination voltage.
The LTC3305 is available in a thermally enhanced 38-lead
TSSOP package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
4-Battery Balancer with Programmed High and Low Battery Voltage Faults
10µF
25V
VREG CM
CP
EN1
EN2
1µF MODE
BOOST
6V TERM1
TERM2
V4
100k EACH
10nF
UVFLT
OVFLT
DONE
BAL
PTCFLT
BATX
BATY
CTON
LTC3305
V3
V2
CTOFF
100nF
V1
CTBAT
10nF
27.4k
VL
42.2k
12.1k
VH
ISET
9
NGATE1-9
GND
AUXP
AUXN
3305 TA01
249Ω
10µF
25V
10µF
25V
1.33k
10µF
25V
10µF
25V
10µF NGATE6
25V
NGATE7
PTC
10µF
25V
+ AUX
6.04k
6.04k
6.04k
6.04k
6.04k
NGATE5
NGATE4
CHARGER
SUPPLY
ICHARGE
BATTERY
STACK
CHARGER
+
BAT4
3.01k
NGATE3 +
BAT3
NGATE2
6.04k
+
BAT2
NGATE1
6.04k
+ BAT1
6.04k
NGATE8
NGATE9
For more information www.linear.com/LTC3305
Battery Voltages Converge
Over Time
16
14
12
10
8
6
4 BATTERY 1
BATTERY 2
2 BATTERY 3
BATTERY 4
0
TIME
3305 TA01a
3305fb
1

LTC3305
LTC3305
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Stack Voltage, V4 to GND..........................................68V
Battery Voltages, V4 to V3, V3 to V2, V2 to V1,
V1 to GND................................................... –0.3V to 20V
Auxiliary Cell Voltage, AUXP to AUXN......... –0.3V to 20V
VREG Voltage................................................. –0.3V to 6V
VH, VL Voltage...... –0.3V to Lesser of 6V or (VREG+0.3V)
UVFLT, OVFLT, PTCFLT, BAL, DONE, BATX,
BATY Voltage................................................ –0.3V to 6V
EN1, EN2, MODE, TERM1, TERM2
Voltage................. –0.3V to Lesser of 6V or (VREG+0.3V)
NGATE1, NGATE2, NGATE3, NGATE4, NGATE8, NGATE9
Voltage............... –0.3V to Lesser of 68V or (V4+0.3V)
NGATE5, NGATE6, NGATE7
Voltage............... (Greater of –0.3V or BOOST–68V) to
(BOOST+0.3V)*
UVFLT, OVFLT, PTCFLT, BAL, DONE, BATX,
BATY Current..........................................................10mA
ISET Current...............................................................1mA
CP, CM Current.......................................................50mA
Operating Junction Temperature Range
(Notes 2, 3)............................................. –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................... 300°C
PIN CONFIGURATION
BOOST 1
V4 2
V3 3
AUXP 4
AUXN 5
V2 6
V1 7
NGATE1 8
NGATE2 9
NGATE3 10
NGATE4 11
NGATE5 12
NGATE6 13
NGATE7 14
NGATE8 15
NGATE9 16
BATX 17
BATY 18
OVFLT 19
TOP VIEW
39
GND
38 CM
37 CP
36 NC
35 MODE
34 EN1
33 EN2
32 TERM1
31 TERM2
30 VREG
29 ISET
28 VH
27 VL
26 CTBAT
25 CTON
24 CTOFF
23 PTCFLT
22 DONE
21 BAL
20 UVFLT
FE PACKAGE
38-LEAD PLASTIC TSSOP
θJA = 28°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
NC = No Connect
*The BOOST voltage is generated by the LTC3305 and is typically 8.45V higher than V4.
ORDER INFORMATION
(http://www.linear.com/product/LTC3305#orderinfo)
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3305EFE#PBF
LTC3305EFE#TRPBF
LTC3305 FE
38-Lead Plastic TSSOP
–40ºC to 125°C
LTC3305IFE#PBF
LTC3305IFE#TRPBF
LTC3305 FE
38-Lead Plastic TSSOP
–40ºC to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
3305fb
2 For more information www.linear.com/LTC3305


Features LTC3305 Lead-Acid Battery Balancer FEAT URES n Single IC Balances Up to Four 1 2V Lead-Acid Batteries in Series n All NFET Design n Stackable to Balance La rger Series Battery Packs n Standalone Balancing Operation: Requires No Exter nal μP or Additional Control Circuitry n Balancing Current Limited by Extern al PTC Thermistor n Continuous Mode an d Timer Mode n Programmable UV and OV Fault Thresholds n Programmable Termin ation Time and Termination Voltage n T hermally Enhanced 38-Lead TSSOP Package APPLICATIONS n Telecom Backup Systems n Home Battery Powered Backup Systems n Industrial Electric Vehicles n Ene rgy Storage Systems (ESS) n Medical Eq uipment DESCRIPTION The LTC®3305 bala nces up to 4 lead-acid batteries connec ted in series. It is intended to be use d in conjunction with a separate pre-ex isting battery charger as part of a hig h performance battery system. All volta ge monitoring, gate drive, and fault de tection circuitry is integrated. The LTC3305 employs an auxiliary.
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