Maxim MAX1665SESA Lithium-ion battery pack protector Datasheet

19-1605; Rev 0; 1/00
Lithium-Ion Battery Pack Protector
____________________________Features
The MAX1665 provides protection against overvoltage,
undervoltage, overcharge current, and overdischarge
current for 2-cell to 4-cell lithium-ion (Li+) battery packs.
Very low operating current ensures that cells are not
overdischarged during long storage periods.
♦ Complete Protection Against:
Cell Overvoltage
Cell Undervoltage
♦ Pack Protection for Excessive Charge and
Discharge
The MAX1665 controls two external N-channel MOSFETs
to limit the charge and discharge voltages. Charging is
allowed when the per-cell voltage is below +4.3V. When
the voltage on any cell rises above +4.3V (overvoltage
limit), the MAX1665 turns off the charge MOSFET. This
safety feature prevents overcharge of any cell within the
battery pack.
♦ Very Low Supply Current: 16µA typ
♦ Low Standby Current: 1µA max
♦ Matched Cell Input Bias Current (<500pA)
Preserves Cell Balance
Discharge is allowed when the per-cell voltage is above
+2.5V (undervoltage limit). If the voltage across any cell
falls below +2.5V, the MAX1665 turns off the discharge
MOSFET. This safety feature prevents overdischarge of
any cell within the battery pack.
Charging and discharging are allowed if the voltage
between PKN and BN is less than 250mV. This safety feature prevents excessive pack current.
Ordering Information
TEMP. RANGE
PINPACKAGE
CELL
COUNT
MAX1665SESA
-40°C to +85°C
8 SO
2
MAX1665VESA
MAX1665XESA
-40°C to +85°C
-40°C to +85°C
8 SO
8 SO
3
4
PART
Applications
Lithium-Ion Battery Packs
Pin Configuration
Typical Operating Circuit
TOP VIEW
(+)
I.C. (B4P) 1
DSG 2
B4P
B3P
B2P
DSG
CHG
3
PKN
4
MAX1665S
MAX1665V
MAX1665X
8
I.C. [B3P]
7
B2P
6
B1P
5
BN
MAX1665X
CHG
B1P
BN
(-)
PKN
SO
NOTES: I.C. = INTERNAL CONNECTION. MAKE NO CONNECTIONS TO THIS PIN.
( ) ARE FOR THE MAX1665X.
[ ] ARE FOR THE MAX1665V AND MAX1665X.
________________________________________________________________ Maxim Integrated Products
1
For free samples and the latest literature visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAX1665S/V/X
General Description
MAX1665S/V/X
Lithium-Ion Battery Pack Protector
ABSOLUTE MAXIMUM RATINGS
B3P to BN (MAX1665V)..........................................-0.3V to +18V
B4P to BN (MAX1665X)..........................................-0.3V to +24V
Continuous Power Dissipation (TA= +70°C)
8-Pin SO (derate 5.88mW/°C above +70°C)...............471mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Temperature Range...........................................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
B4P to PKN (MAX1665X)........................................-0.3V to +24V
B3P to PKN (MAX1665V)........................................-0.3V to +18V
B2P to PKN (MAX1665S)........................................-0.3V to +12V
B1P to PKN, B2P to B1P, B3P to B2P, B4P to B3P...-0.3V to +6V
CHG to PKN, DSG to BN
MAX1665S............................................-0.3V to (VB2P + 0.3V)
MAX1665V............................................-0.3V to (VB3P + 0.3V)
MAX1665X............................................-0.3V to (VB4P + 0.3V)
B2P to BN (MAX1665S)..........................................-0.3V to +12V
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.
ELECTRICAL CHARACTERISTICS
(VB2P = 8V (MAX1665S), VB3P = 12V (MAX1665V), VB4P = 16V (MAX1665X), TA = 0°C to +85°C, unless otherwise noted. Typical
values are at TA = +25°C.)
MAX
UNITS
B2P Voltage Range
PARAMETER
VB2P
MAX1665S
4
10
V
B3P Voltage Range
VB3P
MAX1665V
4
15
V
B4P Voltage Range
VB4P
MAX1665X
20
V
Overvoltage Threshold
VOV
Cell voltage rising
4.34
V
Overvoltage Hysteresis
VCE
Undervoltage Threshold
VUV
Undervoltage RESET
VRE
Overcurrent Sense Threshold
VCH
Overcurrent Hysteresis
VCH2
Overvoltage/Undervoltage
Delay
tUV
Overcurrent Detection Delay
tIO
CONDITIONS
MIN
TYP
4
4.26
4.3
0.10
VBN - VPKN
V
2.4
2.5
2.6
V
0
18
30
mV
±200
±250
±300
mV
(Note 1)
5
mV
200
ms
10
ms
MAX1665S
VB2P - 1.8
VB2P - 0.54
MAX1665V
VB3P - 1.8
VB3P - 0.54
MAX1665X
VB4P - 1.8
VB4P - 0.54
CHG, DSG Output Voltage High
IOUT = 100µA
DSG Output Voltage High
(Note 2)
MAX1665X, IOUT = 100µA, VB4P = 24V,
VBN = 100mV
17
20
V
V
VPKN + 0.1
V
VBN + 0.1
V
CHG Output Voltage Low
VCHGL
ICHG = -100µA
DSG Output Voltage Low
VDSGL
IDSG = -1µA
CHG, DSG Output Source
Current
IOH
CHG = PKN, DSG = BN
10
25
mA
CHG Output Sink Current
IOL
VCHG = VPKN + 3.0V
0.5
2
mA
DSG Output Sink Current
IOL
VDSG = VBN + 3.0V
0.5
2
µA
Overcurrent Sampling - tON
tON
VPKN = ±300mV
8.2
ms
Overcurrent Sampling - tOFF
tOFF
VPKN = ±300mV
135
Input Bias Current (Note 3)
2
SYMBOL
IBIAS
ms
MAX1665SESA, VB1P = 4V
3
10
MAX1665VESA, VB1P = 4V, VB2P = 8V
3
10
MAX1665XESA, VB1P = 4V, VB2P = 8V,
VB3P = 12V
3
10
_______________________________________________________________________________________
nA
nA
Lithium-Ion Battery Pack Protector
(VB2P = 8V (MAX1665S), VB3P = 12V (MAX1665V), VB4P = 16V (MAX1665X), TA = 0°C to +85°C, unless otherwise noted. Typical
values are at TA = +25°C.)
PARAMETER
Input Bias Current Matching
SYMBOL
∆IBIAS
Supply Current
ICC
Standby Mode Current
ILP
Undervoltage Lockout
VUVLO
CONDITIONS
MIN
TYP
MAX
±500
(Notes 3, 4)
UNITS
pA
16
25
µA
(Note 5)
0.7
1
µA
DSG = CHG = low
4.0
4.7
V
ELECTRICAL CHARACTERISTICS
(VB2P = 8V (MAX1665S), VB3P = 12V (MAX1665V), VB4P = 16V (MAX1665X), TA = -40°C to +85°C, unless otherwise noted.) (Note 6)
MAX
UNITS
B2P Voltage Range
PARAMETER
SYMBOL
VB2P
MAX1665S
4
10
V
B3P Voltage Range
VB3P
MAX1665V
4
15
V
B4P Voltage Range
VB4P
MAX1665X
Overvoltage Threshold
VOV
Cell voltage rising
Undervoltage Threshold
VUV
Undervoltage RESET
VRE
Overcurrent Sense Threshold
VCH
CONDITIONS
VBN- VPKN
MIN
TYP
4
20
V
4.20
4.24
V
2.4
2.6
V
0
30
mV
±180
±320
mV
MAX1665S
VB2P - 2
VB2P - 0.5
MAX1665V
VB3P - 2
VB3P - 0.5
MAX1665X
VB4P - 2
VB4P - 0.5
CHG, DSG Output Voltage High
IOUT = 100µA
DSG Output Voltage High
(Note 2)
MAX1665X, IOUT = 100µA, VB4P = 24V,
VBN = 100mV
20
V
V
VPKN + 0.1
V
VBN + 0.1
V
CHG Output Voltage Low
VCHGL
ICHG = -100µA
DSG Output Voltage Low
VDSGL
IDSG = -1µA
CHG, DSG Output Source
Current
IOH
CHG = PKN, DSG = BN
10
mA
CHG Output Sink Current
IOL
VCHG = VPKN + 0.3V
0.2
mA
DSG Output Sink Current
IOL
VDSG = VBN + 0.3V
0.2
µA
Input Bias Current (Note 3)
IBIAS
Supply Current
ICC
Standby Mode Current
ILP
Undervoltage Lockout
VUVLO
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
MAX1665SESA, VB1P = 4V
10
MAX1665VESA, VB1P = 4V, VB2P = 8V
10
MAX1665XESA, VB1P = 4V, VB2P = 8V,
VB3P = 12V
10
(Note 5)
DSG = CHG = low
nA
30
µA
2
µA
4.7
V
Applies to the differential voltage measured on any cell.
DSG is internally clamped to a maximum of 20V to protect the external MOSFET (VGS).
Guaranteed by design.
The input bias matching between cells is measured with a 4V voltage between cells.
At least one cell is <VUV.
Specifications to -40°C are guaranteed by design, not production tested.
_______________________________________________________________________________________
3
MAX1665S/V/X
ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
OVERVOLTAGE THRESHOLD vs.
TEMPERATURE
4.26
HYSTERESIS
4.22
4.18
2.50
2.49
2.48
2.47
VBN - VPKN
252
249
246
243
VBN - VPKN
4.14
VBN - VPKN
2.46
-15
10
35
60
85
240
-40
-15
10
35
60
85
-40
-15
10
35
TEMPERATURE (°C)
TEMPERATURE (°C)
OVERDISCHARGE THRESHOLD
vs. TEMPERATURE
SUPPLY CURRENT
vs. TEMPERATURE
STANDBY MODE CURRENT
vs. TEMPERATURE
SUPPLY CURRENT (µA)
-244
-246
-248
-250
-252
-254
17.5
17.0
16.5
-256
1.0
STANDBY CURRENT (µA)
-242
85
MAX1665 toc06
18.0
MAX1665 toc04
-240
0.9
0.8
0.7
0.6
-258
VBN - VPKN
-260
16.0
-15
10
35
60
85
-40
-20
0
20
40
60
80
100
0.5
-40
-20
0
20
40
80
100
TEMPERATURE (°C)
TEMPERATURE (°C)
QUIESCENT CURRENT
vs. SUPPLY VOLTAGE
CONTINUOUS OVERCHARGE CONDITION
CONTINUOUS OVERDISCHARGE CONDITION
17.6
MAX1665 toc08
MAX1665 toc07
18.0
17.2
16.8
DSG
2V/div
CHG
2V/div
16.4
NORMALIZED TO ONE CELL
16.0
2.5
60
TEMPERATURE (°C)
MAX1665 toc09
-40
3.0
3.5
4.0
4.5
5.0
50ms/div
50ms/div
SUPPLY VOLTAGE PER CELL (V)
4
60
TEMPERATURE (°C)
MAX1665 toc05
-40
OVERDISCHARGE THRESHOLD (mV)
255
MAX1665 toc03
2.51
OVERCURRENT THRESHOLD (mV)
4.30
OVERCURRENT THRESHOLD vs.
TEMPERATURE
MAX1665 toc02
MAX1665 toc01
UNDERVOLTAGE THRESHOLD vs.
TEMPERATURE
UNDERVOLTAGE THRESHOLD (V)
THRESHOLD VOLTAGE (V)
4.34
QUIESCENT CURRENT (µA)
MAX1665S/V/X
Lithium-Ion Battery Pack Protector
_______________________________________________________________________________________
Lithium-Ion Battery Pack Protector
PIN
NAME
FUNCTION
MAX1665S
MAX1665V
MAX1665X
1, 8
1
—
I.C.
Internally Connected. Make no connection to this pin.
—
—
1
B4P
Cell 4 Positive Input. Connect to the positive terminal of the fourth
series Li+ cell.
2
2
2
DSG
Discharge Control Output. Drives the gate of an external N-channel
MOSFET to control the discharge path.
3
3
3
CHG
Charge Control Output. Drives the gate of an external N-channel
MOSFET to control the charge path.
4
4
4
PKN
Pack Negative Input
5
5
5
BN
Connect to the negative terminal of the first series Li+ cell.
6
6
6
B1P
Cell 1 Positive Input. Connect to the positive terminal of the first
series Li+ cell.
7
7
7
B2P
Cell 2 Positive Input. Connect to the positive terminal of the second
series Li+ cell.
—
8
8
B3P
Cell 3 Positive Input. Connect to the positive terminal of the third
series Li+ cell.
Table 1. Functionality Truth Table for VBN < VPKN + 0.018V (Discharge Mode)
CHARGE
OVERCURRENT
DISCHARGE
OVERCURRENT
OVERVOLTAGE
UNDERVOLTAGE
CHG
DSG
GATE
CLOCKED
MAX
SUPPLY
CURRENT*
(µA)
0
0
0
0
High
High
No
25
0
0
0
1
Low
Low
No
1
0
0
1
0
Low
High
No
25
0
0
1
1
Low
Low
No
1
0
1
0
0
Gated
Gated
Yes
25
0
1
0
1
Low
Low
No
1
0
1
1
0
Low
Gated
Yes
25
0
1
1
1
Low
Low
No
1
*Assuming no load on CHG or DSG.
_______________________________________________________________________________________
5
MAX1665S/V/X
Pin Description
Table 2. Functionality Truth Table for VBN > VPKN + 0.018V (Charge Mode)
DSG
GATE
CLOCKED
MAX
SUPPLY
CURRENT*
(µA)
High
High
No
25
1
High
High
No
25
0
Low
High
No
25
1
1
Low
High
No
25
0
0
0
Gated
Gated
Yes
25
1
0
0
1
Gated
Gated
Yes
25
1
0
1
0
Low
High
No
25
1
0
1
1
Low
High
No
25
CHARGE
OVERCURRENT
DISCHARGE
OVERCURRENT
OVERVOLTAGE
UNDERVOLTAGE
CHG
0
0
0
0
0
0
0
0
0
1
0
0
1
*Assuming no load on CHG or DSG.
POWER
ON
POWER
ON
SLEEP CHARGE = 1
DSG = 0
CHG = 0
SUPPLIES
RDY = 1
ON
DSG = 0
CHG = 0
START
START-UP
∆T =
COUNTER ∆T =
ZCHK
DSG = 0 2.4ms DSG = 0 160µs
CHG = 0
CHG = 0
START-UP
MEASURE
DSG = 0
CHG = 0
NORMAL
PULSE OFF ∆T =
DSG = *
96ms
CHG = *
NORMAL
PULSE ON ∆T =
DSG = 1 6.4ms
CHG = 1
NORMAL
ZCHK
DSG = 1
CHG = 1
∆T =
160µs
UV = 0
OV = 1
OV
DSG = 1
CHG = 0
∆T =
2.4ms
OV
PULSE OFF ∆T =
96ms
DSG = 1
CHG = 0
OV
PULSE ON ∆T =
DSG = 1 6.4ms
CHG = 0
OV
ZCHK
DSG = 1
CHG = 0
∆T =
160µs
UV = 1
OV = 0
UV
DSG = 1
CHG = 1
∆T =
UV
PULSE OFF ∆T =
DSG = *
96ms
CHG = *
UV
PULSE ON ∆T =
DSG = 1 6.4ms
CHG = 1
UV
ZCHK
DSG = 1
CHG = 1
2.4ms
CHARGE = 0
OV & UV
DSG = 1
CHG = 0
∆T =
2.4ms
OV & UV
PULSE OFF ∆T =
DSG = 1
96ms
CHG = 0
CHARGE = 0
OV & UV
PULSE ON ∆T =
DSG = 1 6.4ms
CHG = 0
160µs
WAIT FOR
BLANK = 0
DSG = 0
CHG = 0
∆T =
2.4ms
NORMAL
MEASURE
DSG = 1
CHG = 1
∆T =
640µs
OV
MEASURE
DSG = 1
CHG = 0
∆T =
640µs
UV
MEASURE
DSG = 1
CHG = 1
∆T =
640µs
CHARGE = 0
OV & UV
ZCHK
DSG = 1
CHG = 0
SHORT = 1
UV = 1
OV = 1
CHARGE = 0
∆T =
SHORT = 1
∆T =
2.4ms
SHORT = 1
OV = 0
NORMAL
DSG = 1
CHG = 1
UV = 0
∆T =
640µs
SHORT = 1
CHARGE = 0
MAX1665S/V/X
Lithium-Ion Battery Pack Protector
∆T = 160µs
OV & UV
MEASURE
DSG = 1
CHG = 0
∆T =
640µs
* = 0 FOR OVERCURRENT FAULT; 1 OTHERWISE
Figure 1. State Diagram
_______________Detailed Description
The MAX1665S, MAX1665V, and MAX1665X supervise
the charging and discharging processes on Li+ cells.
Designed for 2, 3, and 4-cell applications, these devices
monitor the voltage across each cell to provide protection against overcurrent, overvoltage, and undervoltage.
6
Figure 1 shows the MAX1665 state diagram. Two control pins, CHG and DSG, drive the gates of two seriesconnected external N-channel MOSFETs, enabling/
disabling the charging/discharging process as necessary (see Typical Operating Circuit). The voltages at
B1P, B2P, B3P, and B4P are measured differentially
_______________________________________________________________________________________
Lithium-Ion Battery Pack Protector
Overvoltage Protection
When any individual cell voltage rises above VOV (overvoltage limit), the charge MOSFET control pin (CHG) is
driven to PKN, thereby disconnecting the charger from
the cells. The MAX1665 measures each cell of the pack
differentially to prevent overcharging on a cell-by-cell
basis. The charging process resumes when the highest
cell voltage drops below VOV - 100mV (see Typical
Operating Circuit).
Undervoltage/Overdischarge Protection
Discharge can occur whenever the voltage of each cell
is above the undervoltage threshold voltage (VUV, typically 2.50V). If the voltage on any of the cells falls
below VUV, CHG latches to PKN and DSG latches to
BN. Quiescent current falls to under 1µA as the device
enters the standby mode. The latch resets when BN
exceeds PKN by 18mV.
During charge mode, when BN is greater than PKN, the
latch is held in reset, which disables the undervoltage
comparator feature and allows charging on the cells.
During the initialization process, as cells are connected
to the MAX1665, the device considers this a low-voltage condition and disables CHG and DSG until a
charging source is applied to create at least an 18mV
differential between BN and PKN.
During long-term storage, the battery will self-discharge until it reaches the undervoltage threshold.
When this happens, the MAX1665 enters standby
mode. Normal operating mode resumes when a charger is connected, causing BN to rise 18mV above PKN.
Overcurrent Protection
When the MAX1665 detects overcurrent in the system,
it disables the charge or discharge process by connecting CHG to PKN and DSG to BN, turning off the
external MOSFETs (see Typical Operating Circuit). In
charge mode, the MAX1665 detects overcharge when
the voltage from BN to PKN exceeds +250mV. In discharge mode, overdischarge occurs when the differential voltage is less than -250mV. During any overcurrent
condition, CHG and DSG are gated at 12Hz until the
overcurrent is removed.
If both an overvoltage and overcharge condition exist,
the overvoltage condition takes priority. Likewise, if
undervoltage and overdischarge conditions exist, the
overdischarge condition takes priority. For more
details, see Tables 1 and 2.
Cell Current Balancing
When the battery cells are matched, the MAX1665
draws zero current from the intermediate nodes. The
MAX1665 draws current from the top terminal only.
Figure 2 shows a simplified diagram of the voltage
sampling scheme. The following equations show that,
for balanced cells, the differential discharge currents
are zero:
B4P: I4 = 3ICB + V4 / R = 4V4 / R = BAT4 current
B3P: I3 = I3P + I4 = BAT3 current
I3P + ICB = V3 / R ⇒ I3P = V3 / R - V4 / R
I3 = I4 + (V3 - V4) / R = (3V4 + V3) / R
B2P: I2 = I2P + I3 = BAT2 current
I2P + ICB = V2 / R ⇒ I2P = V2 / R - V4 / R
I2 = I3 + V2 / R - V4 / R = I4 + (V3 - V4) / R +
(V2 - V4) / R = (2V4 + V3 + V2) / R
B1P: I1 = I1P + I2 = BAT1 current
I1P + ICB = V1 / R ⇒ I1P = V1 / R - V4 / R
I1 = I2 + V1 / R - V4 / R = I4 + (V3 - V4) / R +
(V2 - V4) / R + (V1 - V4) / R
= (V4 + V3 + V2 + V1) / R
when V1 = V2 = V3 = V4, I1P = I2P = I3P = 0 and I1 =
I2 = I3 = I4 = 4V4 / R.
Due to process variations, the MAX1665 does draw a
minute current (70nA ~ 150nA) from the intermediate
node even when the cells are matched. This current
difference exists in the sampling mode, which is 1/32 of
the whole time period, making the average of this current 2nA to 5nA.
_______________________________________________________________________________________
7
MAX1665S/V/X
across each cell to determine if the voltage levels are
within operating range.
As depicted in the typical operating circuit, when CHG
and DSG are high, the MOSFETs are on, allowing the
cells to charge or discharge. However, when the
charge or discharge current becomes excessive, the
device turns off the FETs, enters a standby mode, and
periodically samples the current to determine if the fault
condition is removed. The MAX1665 does not sample
the current directly, but rather measures the differential
voltage across BN and PKN produced by the charge or
discharge current flowing through the drain-to-source
resistance of the MOSFETs. A preset voltage threshold
is used to prevent excess current flow (see Electrical
Characteristics).
In operating mode, all of the MAX1665 versions consume less than 25µA of quiescent current, allowing
long-term battery storage without significantly affecting
battery life. In standby mode, these devices consume
less than 1µA of quiescent current.
MAX1665S/V/X
Lithium-Ion Battery Pack Protector
Table 3. Recommended MOSFETs
BP4
+
V4
+
V3
I4
BP3
I3
I3P
B3P1
ICB V4
R
BP2
+
V2
I2
I1
TYPICAL
RDS(ON) (Ω)
MAX VGS
(V)
IRF9956
0.10
±20
FDS6990A
0.018
±20
Si9936
0.050
±20
B2P1
I2P
ICB V4
R +
V2
B1P1
BP1
+
V1
DUAL N-CHANNEL
MOSFETs
ICB V4
R
I1P +
V1
+
V3
R
+
V4
R
R
R
1
V1
R
V2
R
V3
R
8
V4
R
7
PACK+
CELL 2
Figure 2. Sampling Mode Equivalent Circuit
CELL 1
Applications Information
6
5
I.C.
I.C.
B2P
B1P
BN
MAX1665S
IRF7101
Choosing an External MOSFET
The external N-channel MOSFETs act as gated switches to enable or disable the charging/discharging
process. CHG and DSG control the gate of these external MOSFETs to prevent damage to the Li+ cells. For
overcurrent conditions, the voltage at DSG equals the
voltage at BN, thereby reducing all current flow, including the path through the body diode of the
N-channel MOSFET. Note that the MAX1665X clamps
the VGS voltage to a maximum of 20V.
The IRF7101 is a low-cost, dual N-channel MOSFET
that is available in a small 8-pin SO package.
Depending on the maximum charge and discharge
rates, use different MOSFETs to optimize each application. Table 3 summarizes recommended MOSFETs.
OVERDISCHARGE
PROTECTION
2
DSG
IRF7101
OVERCHARGE
PROTECTION
PACK-
3
4
CHG
PKN
Figure 3. Typical 2-Cell Operating Circuit
2, 3, and 4-Cell Applications
Figures 3 through 5 depict circuits for 2, 3, and 4-cell
applications. Note that the two series MOSFETs (IRF7101
dual N-channel MOSFETs) are oriented to prevent body
diode current flow. The indicated polarity symbols show
the connection for the external source required to charge
the Li+ cells. This external charger source also supplies
the gate drive to the MOSFETs through pack + voltage /
pack.
8
_______________________________________________________________________________________
Lithium-Ion Battery Pack Protector
1
PACK+
I.C.
CELL 4
8
PACK+
CELL 3
CELL 2
CELL 1
7
B3P
CELL 3
B2P
CELL 2
6
B1P
CELL 1
5
BN
MAX1665V
2
DSG
OVERDISCHARGE
PROTECTION
PACK-
3
4
6
5
B3P
B2P
B1P
BN
MAX1665X
2
DSG
IRF7101
IRF7101
OVERCHARGE
PROTECTION
7
B4P
IRF7101
IRF7101
OVERDISCHARGE
PROTECTION
8
MAX1665S/V/X
1
CHG
OVERCHARGE
PROTECTION
PKN
PACK-
Figure 4. Typical 3-Cell Operating Circuit
3
4
CHG
PKN
Figure 5. Typical 4-Cell Operating Circuit
_______________________________________________________________________________________
9
MAX1665S/V/X
Lithium-Ion Battery Pack Protector
________________________________________________________Package Information
10
______________________________________________________________________________________
Lithium-Ion Battery Pack Protector
MAX1665S/V/X
NOTES
______________________________________________________________________________________
11
MAX1665S/V/X
Lithium-Ion Battery Pack Protector
NOTES
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2000 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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