MAX1906 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – Li+ Battery-Pack Protector with Integrated Fuse Driver

19-2455; Rev 0; 4/02
Li+ Battery-Pack Protector with
Integrated Fuse Driver
General Description
The MAX1906 protects against overvoltage conditions
in lithium-ion/lithium polymer (Li+) battery packs by
blowing a three-terminal protection fuse. The IC should
be used in conjunction with resettable protection cir-
cuits to provide a high level of safety against over-
charging Li+ batteries. It can be used with 2-, 3-, or
4-series cell battery packs.
The MAX1906 monitors individual cell voltages. If any
cell voltage exceeds the overvoltage threshold for
greater than 2.1s, the MAX1906 activates an internal
SCR. The SCR sinks sufficient current to blow an exter-
nal protection fuse, permanently disabling the battery
pack. Alternatively, the IC can drive the gate of an
external MOSFET to blow the fuse.
The MAX1906 also offers protection against disconnect-
ed voltage sense pins. If a disconnected pin is detected,
the DISCON output is forced low. The MAX1906 includes
a test mode, which determines if the circuit is operating
correctly while in an assembled battery pack.
The low-cost MAX1906 is available in a thermally
enhanced 16-pin QFN package.
Applications
2-, 3-, or 4-Series Li+ Battery Packs for
Portable Products
Features
o Protects Against Overvoltage
o ±1% Accurate Protection Thresholds
o Integrated 2.1s Fault-Delay Timer
o Built-in 1.5A SCR Fuse Driver
o Test Mode for Functional Verification in
Assembled Pack
o 8µA (max) Supply Current
o 1µA (max) Standby Current
o Protects Against Disconnected B1P–B4P Pins
o Protects 2-, 3-, or 4-Series Li+ Battery Packs
o Available in Small 16-Pin QFN Package
(5mm x 5mm)
Ordering Information
PART
MAX1906SEGE
MAX1906VEGE
MAX1906XEGE
TEMP RANGE PIN-PACKAGE CELLS
-40°C to +85°C 16 QFN 5mm ✕ 5mm 2
-40°C to +85°C 16 QFN 5mm ✕ 5mm 3
-40°C to +85°C 16 QFN 5mm ✕ 5mm 4
Minimal Operating Circuit
FUSE
PACK+
VCC
7 _OUT
B4P ¹⁶
OPTIONAL
PACK
CONTROLLER
4 _DISCON
B3P ¹⁴
2
DRV
MAX1906X
12
B2P
3
TEST
10
B1P
5
PKN
8
BN
PACK-
Pin Configuration
I.C. 1
DRV 2
TEST 3
DISCON 4
16 15 14 13
MAX1906S/V/X
12 B2P
11 N.C.
10 B1P
9 I.C.
5678
5mm x 5mm QFN
[]:MAX1906V, MAX1906X
():MAX1906X
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