MAX1906VEEE Maxim Integrated, MAX1906VEEE Datasheet - Page 8

• Manufacturer Part Number: MAX1906VEEE
• Description: Battery Management
• Manufacturer: Maxim Integrated
• Series: MAX1906r

The MAX1906 operates in normal mode when at least 1
cell voltage is above the standby-mode threshold. In this
mode, the average supply current from the top cell is
8µA (max). The MAX1906 works by sampling cell volt-
ages for 0.8ms and then goes into an idle state for 2.56s
to complete a cycle. During the sampling period, the
MAX1906 typically consumes 300µA. In the idle state,
the MAX1906 typically consumes 3.2µA. Figure 6 shows
the device current consumption in different states.
When all the cell voltages are below the standby-mode
threshold, the MAX1906 goes into the standby mode. In
Li+ Battery-Pack Protector with
Integrated Fuse Driver
Figure 5. Typical Application Circuit—Using the MAX1906 with a MAX1924 Protection Circuit
8
PACK+
PACK-
_______________________________________________________________________________________
DISCON
PROTECTION FUSE
THREE-TERMINAL
TEST
VCC
R5
100kΩ
SFD-145B
7
4
2
3
5
OUT
DISCON
DRV
TEST
PKN
Modes of Operation
Normal Operating Mode
MAX1906X
OVERDISCHARGE
PROTECTION
B4P
B3P
B2P
B1P
BN
16
14
12
10
8
Standby Mode
510Ω
Si4435DY
R
TKO
C9
0.1µF
C8
0.1µF
C7
0.1µF
C6
0.1µF
10Ω
1kΩ
1kΩ
1kΩ
R8
R7
R6
R9
TRICKLE
CHARGE
BSS84
R
SENSE
0.02
51Ω
1kΩ
1kΩ
1kΩ
R3
R4
R2
R1
this mode, the device draws 1µA (max) from the top
cell. Once any cell voltage goes above the standby-
mode threshold, the MAX1906 wakes up and goes into
the normal mode.
The test mode is designed to verify the overvoltage
detection function in a fully assembled battery pack with-
out blowing the three-terminal protection fuse. Test mode
is invoked by a pulse with minimum duration of 50µs on
the TEST pin. The MAX1906 changes the overvoltage
threshold from 4.45V to 2.225V in the test mode and
samples each of the cell voltages. Individual cell volt-
ages are expected to be above 2.225V during the test
mode. If the MAX1906 detects overvoltage condition on
all cells during one sampling period, the DRV pin goes
OVERCHARGE
PROTECTION
Si4435DY
CMPSH-3
C4
1.0µF
C3
0.1µF
C2
0.1µF
C1
0.1µF
10Ω
R10
D1
C5
0.1µF
15
14
13
1
2
3
7
9
5
B4P
V
B3P
B2P
B1P
BN
DSO
CGO
TKO
CC
MAX1924X
16
10
SRC
PKN
SHDN
CTL
12
11
BN
CONTROLLER
C6
2.2µF
MICRO-
Test Mode
VDD
GND
TEST
DISCON