MAX1665S Datasheet, PDF (1/12 Pages) Maxim Integrated Products – Lithium-Ion Battery Pack Protector

19-1605; Rev 0; 1/00
Lithium-Ion Battery Pack Protector
General Description
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.
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.
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 fea-
ture prevents excessive pack current.
Applications
Lithium-Ion Battery Packs
____________________________Features
o Complete Protection Against:
Cell Overvoltage
Cell Undervoltage
o Pack Protection for Excessive Charge and
Discharge
o Very Low Supply Current: 16µA typ
o Low Standby Current: 1µA max
o Matched Cell Input Bias Current (<500pA)
Preserves Cell Balance
PART
MAX1665SESA
MAX1665VESA
MAX1665XESA
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
8 SO
8 SO
8 SO
CELL
COUNT
2
3
4
Typical Operating Circuit
(+)
B4P
B3P
DSG
B2P
MAX1665X
CHG
B1P
BN
(-)
PKN
TOP VIEW
Pin Configuration
I.C. (B4P) 1
DSG 2
CHG 3
PKN 4
MAX1665S
MAX1665V
MAX1665X
8 I.C. [B3P]
7 B2P
6 B1P
5 BN
SO
NOTES: I.C. = INTERNAL CONNECTION. MAKE NO CONNECTIONS TO THIS PIN.
( ) ARE FOR THE MAX1665X.
[ ] ARE FOR THE MAX1665V AND MAX1665X.
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