19-5482; Rev 3; 8/10
5-Cell to 10-Cell Li+ Protector with
Cell Balancing
General Description
The DS2726 provides full charge and discharge protection
for 5- to 10-cell lithium-ion (Li+) battery packs. The protec-
tion circuit monitors individual cell voltages to detect over-
voltage and undervoltage conditions. Protection against
discharge overcurrent and short-circuit current is provided
with user-selectable thresholds using external resistors.
P-channel protection FETs are employed high side and
driven from on-chip 10V FET drivers. Cell balancing can
be enabled to ensure that all cells are equally charged.
♦
Pin Programmable for 5 to 10 Cells
♦
Internal Cell-Balancing Circuit, Shunts Up to 300mA
♦
Pin-Programmable V
OV
Threshold
♦
Pin-Programmable Cell-Balance Voltage
♦
Overdischarge Current and Short-Circuit Current
Set with External Resistors
♦
Overdischarge Current and Short-Circuit Current
Timeout Delay Set with External Capacitors
♦
Low Power Consumption: 60µA (typ)
♦
Low Shutdown Power Consumption: 5µA (typ)
♦
7mm x 7mm, 32-Pin TQFN Lead-Free Package
Features
♦
Complete Protection for 5-Cell to 10-Cell Li+ Packs
DS2726
Applications
Power Tools
Electric Bikes
Home Appliances
Simplified Typical Application
Circuit
PKP+
Ordering Information
PART
DS2726G+
DS2726G+T&R
TEMP RANGE
-20°C to +85°C
-20°C to +85°C
PIN-PACKAGE
32 TQFN-EP*
32 TQFN-EP*
PKP CC
V
CC
V
CC
SNS
DC V
IN
V10
+Denotes
a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
*EP
= Exposed pad.
V09
SEL0
SEL1
OVS0
OVS1
CBS0
CBS1
CBCFG
SLEEP
SLEEP
V06
V07
V08
DS2726
CSCD
V05
Pin Configuration appears at end of data sheet.
V04
V
IN
RSC
RDOC
V03
V02
CDOCD
V01
V00
GND
PKP-
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
5-Cell to 10-Cell Li+ Protector with
Cell Balancing
DS2726
ABSOLUTE MAXIMUM RATINGS
Voltage Range on V00–V10, PKP,
RDOC, RSC Pins Relative to GND .....................-0.3V to +60V
Voltage Range on DC Pin Relative to V
IN
..............-12V to +0.3V
Voltage Range on CC Pin Relative to PKP .............-12V to +0.3V
Voltage Range on CSCD, SEL0, SEL1,
OVS0, OVS1, CBS0, CBS1, SLEEP,
CBCFG, V
CC
Pins Relative to GND ...................-0.3V to +6.0V
Human Body Model (HBM) ESD Limit of
V05–V09, PKP, CC, DC..................................................±500V
All Other Pins ...................................................................±2kV
Voltage Range on Any V
x
to V
x-1
(V10 to V09).......-0.3V to +12V
Continuous Power Dissipation (T
A
= +70°C)
TQFN (derate 37mW/°C above +70°C) .....................2963mW
Junction Temperature ......................................................+150°C
Operating Temperature Range ...........................-20°C to +85°C
Storage Temperature Range .............................-55°C to +125°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED DC OPERATING CONDITIONS
(T
A
= -20°C to +85°C.)
PARAMETER
Supply Range
Input Range: SEL0, SEL1, OVS0,
OVS1, CBS0, CBS1, CSCD,
CDOCD, SLEEP, CBCFG
SYMBOL
V
IN
CONDITIONS
(Notes 1, 2, 3, 4)
(Note 1)
MIN
5
-0.3
TYP
MAX
50
V
CC
+
0.3
UNITS
V
V
DC ELECTRICAL CHARACTERISTICS
(T
A
= -20°C to +85°C.)
PARAMETER
Supply Current
V00–V10 Leakage Current
Input Logic-High: SEL0, SEL1,
OVS0, OVS1, CBS0, CBS1,
SLEEP
Input Logic-Mid: SEL0, SEL1,
OVS0, OVS1, CBS0, CBS1,
SLEEP
Input Logic-Low: SEL0, SEL1,
OVS0, OVS1, CBS0, CBS1,
SLEEP
V
CC
Output Voltage
V
CC
Dropout Voltage
Output Low: CC
Output Low: CC Driver Current
V
OLCC
V
IH
SYMBOL
I
DD
I
DD_BAL
I
SLEEP
CONDITIONS
Protector mode, no fault (Notes 4, 9)
Load balancing (Note 11)
Sleep mode
All cell voltages = 4.2V (Note 10)
I
LOAD
= 2μA (Notes 1, 5)
-2
V
CC
-
0.4
5.0
MIN
TYP
70
MAX
90
400
7.5
+2
μA
V
μA
UNITS
V
IM
I
LOAD
= 0 (Notes 1, 5)
1.30
1.65
2.00
V
V
IL
I
LOAD
= -2μA (Notes 1, 5)
I
LOAD
= 1mA (Notes 1, 5, 8)
(Note 6)
I
OL
= -100μA, V
PKP
CC = V
OLCC
+ 2V
CC = V
OHCC
- 1V
13V (Notes 3, 5)
V
PKP
- 12
-3
-15
4.75
5.00
V
GND
+
0.4
5.25
5.5
V
PKP
- 8
-1
-7
V
V
V
V
mA
2
_______________________________________________________________________________________
5-Cell to 10-Cell Li+ Protector with
Cell Balancing
DC ELECTRICAL CHARACTERISTICS (continued)
(T
A
= -20°C to +85°C.)
PARAMETER
Output High: CC
Output High: CC Driver Current
Output Low: DC
Output Low: DC Driver Current
Output High: DC
Output High: DC Driver Current
Maximum Balancing Current
Balance FET: On-Resistance
I
BAL
I
BAL
= 180mA
1.7
3.2
V
OHDC
V
OLDC
SYMBOL
V
OHCC
I
OH
= 100μA
CC = V
OLCC
+ 2V
CC = V
OHCC
- 1V
I
OL
= -100μA, V
IN
DC = V
OLDC
+ 2V
DC = V
OHDC
- 1V
I
OH
= 100μA
DC = V
OLDC
+ 2V
DC = V
OHDC
- 1V
13V (Notes 3, 5)
CONDITIONS
MIN
V
PKP
-
0.5
7
0.5
V
IN
-
12
-3
-15
V
IN
-
0.5
7
0.5
TYP
MAX
V
PKP
+
0.3
15
1.5
V
IN
-
8
-1
-7
V
IN
+
0.3
15
1.5
300
7.0
UNITS
V
mA
V
mA
V
mA
mA
DS2726
ELECTRICAL CHARACTERISTICS: PROTECTION CIRCUIT
(T
A
= 0°C to +50°C.)
PARAMETER
SYMBOL
CONDITIONS
OVS1 = GND, OVS0 = GND
OVS1 = GND, OVS0 = N.C.
OVS1 = GND, OVS0 = V
CC
OVS1 = N.C., OVS0 = GND
Overvoltage Detect
V
OV
OVS1 = N.C., OVS0 = N.C.
OVS1 = N.C., OVS0 = V
CC
OVS1 = V
CC
, OVS0 = GND
OVS1 = V
CC
, OVS0 = N.C.
OVS1 = V
CC
, OVS0 = V
CC
Charge-Enable Voltage
V
CE
MIN
4.05
4.10
4.15
4.20
4.25
4.30
4.35
4.40
4.45
V
OVMIN
-
0.15
V
BAL
lowest typical set point limited to
3.75V
V
OVMIN
-
Cell-
Balancing
Threshold
2.7
2.2
V
IN
- V
RDOC
= V
IN
- V
RSC
= 2V
0.95
-3
2.8
2.3
1.00
TYP
4.10
4.15
4.20
4.25
4.30
4.35
4.40
4.45
4.50
MAX
4.15
4.20
4.25
4.30
4.35
4.40
4.45
4.50
4.55
V
OVMAX
-
0.15
V
OVMAX
-
Cell-
Balancing
Threshold
2.9
2.4
1.05
+3
V
V
UNITS
Charge-Balance Voltage
V
BAL
V
Undervoltage Release
Undervoltage Detect
RDOC, RSC Output Current
RDOC, RSC Input Offset Voltage
V
UVREL
V
UV
V
V
μA
mV
_______________________________________________________________________________________
3
5-Cell to 10-Cell Li+ Protector with
Cell Balancing
DS2726
ELECTRICAL CHARACTERISTICS: PROTECTION CIRCUIT (continued)
(T
A
= 0°C to +50°C.)
PARAMETER
Overvoltage Delay
Undervoltage Delay
Discharge Overcurrent Delay
Short-Circuit Delay
Charger-Detect Threshold
(V
PKP
- V
VIN
)
Test Threshold
Test Current
SYMBOL
t
OVD
t
UVD
t
DOCD
t
SCD
V
CDET
V
TP
I
TST
DOC conditions
DOC condition, V
IN
- V
PKP
= 2V
DOC condition, V
IN
- V
PKP
= 50V
C
DOCD
= 100pF (Notes 7, 12)
C
DOCD
= 1000pF (Notes 7, 12)
C
SCD
= 100pF (Notes 7, 12)
C
SCD
= 1000pF (Notes 7, 12)
CONDITIONS
MIN
128 x
t
DOCDMIN
128 x
t
DOCDMIN
2.56
25.6
45
405
3
0.8
68
0.5
1.2
120
1.20
3.20
32.0
58
508
TYP
MAX
128 x
t
DOCDMAX
128 x
t
DOCDMAX
3.84
38.4
72
612
17
1.7
200
1.8
UNITS
ms
ms
ms
μs
mV
V
μA
mA
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10:
Note 11:
Note 12:
All voltages relative to GND.
Voltages below this level cannot be monitored; therefore, CC and DC are off below this value.
Full-gate drive is not achieved until the voltage source for the gate driver (V
PKP
or V
VIN
) is above 13V.
With 10µF decoupling capacitor.
I
LOAD
is the current load on the pin specified in the parameter.
V
CC
cannot meet specification if V
VIN
is below this value.
Capacitance tolerance introduces additional error.
With
≥
0.1µF decoupling capacitor.
Current is an average. Spikes up to 200µA when measuring cell voltages.
Current is an average. Spikes up to 15µA when measuring cell voltages.
Current depends on the number of cells being balanced.
Includes switching time and comparator delay with 25mV overdrive.
4
_______________________________________________________________________________________
5-Cell to 10-Cell Li+ Protector with
Cell Balancing
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
DS2726
OV ACCURACY vs. TEMPERATURE
DS2726 toc01
UV ACCURACY vs. TEMPERATURE
DS2726 toc02
TEST CURRENT vs. (V
VIN
- V
PKP
)
DS2726 toc03
0.009
0.007
0.005
OV ACCURACY (V)
1.2
1.0
0.8
I
TST
(mA)
0.6
0.4
0.014
0.012
UV ACCURACY (V)
0.010
0.008
0.006
0.004
0.002
0
0.003
0.001
-0.001
-0.003
-0.005
-0.007
-0.009
-40
-15
10
35
60
85
TEMPERATURE (°C)
0.2
0
-40
-15
10
35
60
85
0
10
V
TP
= 1.16V
20
30
40
50
60
TEMPERATURE (°C)
(V
VIN
- V
PKP
) (V)
DISCHARGE OVERCURRENT DELAY
(CDOCD = 1000pF, R
DOC
= 110kΩ
WITH R
DS_ON
= 2.75kΩ)
1
-1
VGS DISCHARGE FET (V)
LOAD CURRENT
LOAD CURRENT (A)
-3
-5
-7
VGS DISCHARGE FET
-9
-11
0
10
20
30
40
50
TIME (ms)
0
-10
-9
-11
0
DISCHARGE OVERCURRENT
THRESHOLD
30
20
10
DS2726 toc04
SHORT-CIRCUIT DELAY
(CDOCD = 1000pF, RSC = 247.5kΩ
WITH R
DS_ON
= 2.75MΩ)
50
40
VGS DISCHARGE FET (V)
1
SHORT-CIRCUIT CONDITION
-1
-3
LOAD CURRENT
-5
-7
SHORT-CIRCUIT
THRESHOLD
VGS DISCHARGE FET
60
40
20
0
50
TIME (μs)
100
100
80
LOAD CURRENT (A)
DS2726 toc05
DOC CONDITION
120
FET TURN-OFF TIME
(WITH 460nC TOTAL GATE CHARGE)
40
35
30
25
5V/div
20
15
10
5
20 40 60 80 100 120 140 160 180 200
20μs/div
DS2726 toc06
_______________________________________________________________________________________
5
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