MAX1666A Datasheet, PDF (1/17 Pages) Maxim Integrated Products – Advanced Lithium-Ion Battery-Pack Protector

19-1465; Rev 2; 12/03
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
(Li+) 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 battery power conservation. The MAX1666 can oper-
ate in a stand-alone configuration or in conjunction with a
microcontroller. It is available in four versions: the S ver-
sion monitors two Li+ cells, the A and V versions monitor
three cells, and the X version monitors four cells. When
the charge path is disabled by the charge control pin, the
MAX1666A reduces current consumption compared to
the MAX1666S/V/X.
Features
♦ Overvoltage Protection
Programmable Limits from +4.0V to +4.4V
Accurate to ±0.5%
♦ Undervoltage Protection
Programmable Limits from +2.0V to +3.0V
Accurate to ±2.5%
♦ Cell Mismatch Protection
Programmable Limits from 0 to 500mV
Accurate to ±10%
♦ Overcharge Current Protection
♦ Overdischarge Current Protection
♦ Low 30µA (typ) Operating Supply Current
♦ Low 1µA (max) Standby Current
♦ +28V (max) Input Voltage
♦ Available in Small 16-Pin QSOP (MAX1666S) and
20-Pin QSOP (MAX1666A/V/X) Packages
Applications
2/3/4-Cell Lithium-Ion Battery Pack
Selector Guide
PART
MAX1666S
MAX1666A/V
MAX1666X
NUMBER OF Li+ CELLS
2
3
4
Typical Operating Circuits appear at end of data sheet.
PART
MAX1666SEEE
MAX1666AEEP
MAX1666VEEP
MAX1666XEEP
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 QSOP
20 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 V_CC
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
MAX1666A/V
20 UVO
19 V_CC
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 V_CC
18 REF
17 OVA
16 UVA
15 MMA
14 WRN
13 PKF
12 CGI
11 DSI
QSOP
QSOP
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