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PDF MAX1666SEEE Data sheet ( Hoja de datos )
| Número de pieza | MAX1666SEEE | |
| Descripción | Advanced Lithium-Ion Battery-Pack Protector | |
| Fabricantes | Maxim Integrated | |
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19-1465; Rev 1; 7/99
Advanced Lithium-Ion
Battery-Pack Protector
General Description
The MAX1666 provides complete protection against over-
voltage, undervoltage, overcharge current, overdischarge
current, and cell mismatch for 2-cell to 4-cell Lithium-Ion
battery packs. The voltage of each cell in the battery pack
is checked and compared to the programmable threshold
and to the other cells in the pack.
The MAX1666 protects the battery pack in an overcurrent
condition by disconnecting the pack from the load at a pro-
grammable limit. On-chip power MOSFET drivers control
external P-channel MOSFETs to disconnect the cells from
external terminals when faults occur.
The MAX1666 employs a unique timing scheme that allows
three modes of operation, for optimal performance and bat-
tery power conservation. The MAX1666 can operate in a
stand-alone configuration or in conjunction with a micro-
controller. It is available in three versions: the “S” version
monitors two Li-Ion cells, the “V” version monitors three
cells, and the “X” version monitors four cells.
Applications
2/3/4-Cell Lithium-Ion Battery Pack
Features
o Overvoltage Protection
Programmable Limits from +4.0V to +4.4V
Accurate to ±0.5%
o Undervoltage Protection
Programmable Limits from +2.0V to +3.0V
Accurate to ±2.5%
o Cell Mismatch Protection
Programmable Limits from 0 to 500mV
Accurate to ±10%
o Overcharge Current Protection
o Overdischarge Current Protection
o Low Operating Supply Current: 30µA typ
o Low Standby Current: 1µA max
o +28V max Input Voltage
o Available in Small 16-Pin QSOP (MAX1666S) and
20-Pin QSOP (MAX1666V/X) Packages
PART
MAX1666S
MAX1666V
MAX1666X
Selector Guide
NUMBER OF LI-ION CELLS
2
3
4
Typical Operating Circuits appear at end of data sheet.
PART
MAX1666SEEE
MAX1666VEEP
MAX1666XEEP
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 QSOP
20 QSOP
20 QSOP
Pin Configurations
TOP VIEW
SRC 1
DSO 2
TKO 3
CGO 4
B2P 5
BIP 6
GND 7
PKN 8
MAX1666S
QSOP
16 VCC
15 REF
14 OVA
13 UVA
12 MMA
11 PKF
10 CGI
9 DSI
SRC 1
DSO 2
TKO 3
CGO 4
B3P 5
B3P 6
B2P 7
B1P 8
GND 9
PKN 10
MAX1666V
20 UVO
19 VCC
18 REF
17 OVA
16 UVA
15 MMA
14 WRN
13 PKF
12 CGI
11 DSI
SRC 1
DSO 2
TKO 3
CGO 4
B4P 5
B3P 6
B2P 7
B1P 8
GND 9
PKN 10
MAX1666X
20 UVO
19 VCC
18 REF
17 OVA
16 UVA
15 MMA
14 WRN
13 PKF
12 CGI
11 DSI
QSOP
QSOP
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
(TA = +25°C, unless otherwise noted.)
Advanced Lithium-Ion
Battery-Pack Protector
Typical Operating Characteristics
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
770
VCELL = 3.6V
760
750
740
730
720
710
700
-40
4.400
-20 0 20 40 60 80
TEMPERATURE (°C)
OVERVOLTAGE THRESHOLD
vs. TEMPERATURE
OVA = REF
100
4.395
SUPPLY CURRENT
vs. TEMPERATURE
UNDERVOLTAGE THRESHOLD
vs. TEMPERATURE
35 3.0015
VCELL = 3.6V
UVA = REF
33
3.0010
31
29
3.0005
27
25
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
MISMATCH VOLTAGE THRESHOLD
vs. TEMPERATURE
501
MMA = REF
500
499
3.0000
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
OVERCHARGE THRESHOLD
vs. TEMPERATURE
203
202
498 201
4.390
497
200
496
4.385
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
OVERDISCHARGE THRESHOLD
vs. TEMPERATURE
302
495
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
OVERDISCHARGE PROTECTION
199
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
OVERDISCHARGE RECOVERY TIME
301
300 PKN
(0.5V/div)
299
PKN
(0.5V/div)
298
tI-DELAY
tP
297
DSO
296 (10V/div)
DSO
(10V/div)
295
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
1ms/div
100ms/div
_______________________________________________________________________________________ 5
5 Page 
Advanced Lithium-Ion
Battery-Pack Protector
B4P
I4
+
V4
- B3P
ICB
=
V4
R
I3P
+
V3
I3
- B2P
ICB
=
V4
R
I2P
+
V2
I2
- B1P
ICB
=
V4
R
I1P
++ + +
+
V1
I1
V1 R V2 R
--
V3 R
-
V4 R
-
-
V1 V2 V3 V4
R RR R
Figure 4. Cell Voltage Sampling
Maximum mismatch of 1% external resistor-dividers is
±2%. The external adjusted overvoltage threshold accu-
racy includes the internal overvoltage threshold accuracy
(±0.5%) and the error due to the external resistor-divider
multiplied by maximum adjustment.
±2% 4.4V − 4.0V = ± 0.2%
4.4V
The total external adjusted overvoltage threshold (VOVT)
accuracy is ±0.7%.
Undervoltage Protection
The MAX1666 provides undervoltage protection to
avoid overdischarging the cells. When any cell is under
voltage, UVO, DSO, and CGO go high, turning off the
external charging and discharging MOSFETs. TKO
remains low to keep the trickle charge current on.
Undervoltage threshold is linearly adjustable through
an external resistor-divider (Figure 3) from REF.
Determine the undervoltage threshold (VUVT) required.
VUVT must be between 2V and 3V. Set RTOTAL = R3 +
R4 = 1MΩ. Calculate R3 and R4 as follows:
R4 = [(VUVT - 2V) / (3V - 2V)] RTOTAL
R3 = RTOTAL - R4
Maximum mismatch of 1% external resistor-dividers is
±2.0%, and the error due to the external resistor-divider
multiplied by maximum adjustment is ±2% (3V - 2V) / 3V
= ±0.7%. The total external adjusted undervoltage
threshold (VUVT) accuracy including the internal under-
voltage threshold accuracy (±2.5%) is ±3.2%.
Undervoltage Warning
When any cell drops to 100mV above the undervoltage
threshold, WRN goes low. WRN returns high when all
cells are 300mV above the undervoltage threshold.
Cell-Mismatch Protection
The MAX1666 disables charging or discharging when
mismatch occurs. When any two cells are mismatched,
TKO, CGO, UVO, and DSO go high, turning off the
external MOSFETs. PKF goes low. PKF has a strong
pull-down current (>4mA), and can be used to control
an external thermal fuse. The cell-mismatch threshold is
linearly adjustable through an external resistor-divider
(Figure 3) from REF. Determine the cell-mismatch
threshold (VCMT) required. VCMT has to be between 0
and 500mV. Set RTOTAL = R5 + R6 = 1MΩ. Calculate
R5 and R6:
R6 = (VCMT / 500mV) RTOTAL
R5 = RTOTAL - R6
Maximum mismatch of 1% external resistor-divider is
±2%. The total external adjusted cell-mismatch thresh-
old accuracy, including the internal cell-mismatch
threshold accuracy (±10%), is ±12%.
Cell Voltage Sampling
The MAX1666 does not introduce cell mismatch. When
the battery cells are matched, the MAX1666 draws
close to zero current from the intermediate cells.
Figure 4 shows a simplified diagram of the voltage
sampling scheme.
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
______________________________________________________________________________________ 11
11 Page | ||
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| PDF Descargar | [ Datasheet MAX1666SEEE.PDF ] | |
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