MAX6841IUKD1+T Maxim Integrated, MAX6841IUKD1+T Datasheet - Page 8

• Manufacturer Part Number: MAX6841IUKD1+T
• Description: Supervisory Circuits
• Manufacturer: Maxim Integrated
• Series: MAX6841, MAX6842, MAX6843, MAX6844, MAX6845r

Specifications of MAX6841IUKD1+T

• Number Of Voltages Monitored: 1
• Monitored Voltage: 0.9 V to 1.5 V
• Undervoltage Threshold: 1.35 V
• Overvoltage Threshold: 1.425 V
• Output Type: Active High, Active Low, Push-Pull
• Manual Reset: Resettable
• Watchdog: No Watchdog
• Battery Backup Switching: No Backup
• Power-up Reset Delay (typ): 2 ms
• Supply Voltage - Max: 1.8 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOT-23
• Chip Enable Signals: No
• Maximum Power Dissipation: 571 mW
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: No
• Supply Current (typ): 8.1 uA
• Supply Voltage - Min: 0.75 V

the direction of current flow. To reverse the current flow,
the charger has to be removed (Figure 5). The sustain-
ing condition for the latch is a 100mV (max) voltage
drop across SRC and B4P. Since the charge-current
fault threshold between BN and PKN is also 100mV
(typ), the R
must be greater than the sense resistor in order to
ensure a latched state.
The MAX1894/MAX1924 protect against excessive dis-
charge-current by monitoring the voltage developed
across R
rent fault threshold (V
Advanced Li+ Battery-Pack Protectors
Figure 1. Typical Applications Circuit with Trickle Charge
8
_______________________________________________________________________________________
SENSE
Discharge-Current Fault Protection
DS_ON
PACK +
. If V
PACK -
of the overcharge protection MOSFET
OVERDISCHARGE
RSENSE
PROTECTION
OD_TH
exceeds the discharge-cur-
, typically 145mV) for more
510Ω
R
TKO
TRICKLE
CHARGE
R
0.02Ω
SENSE
CMPSH-3
51Ω
1kΩ
1kΩ
1kΩ
R4
R3
R2
R1
OVERCHARGE
PROTECTION
D1
0.1µF
C3
0.1µF
C1
0.1µF
C4
1µF
C2
0.1µF
C6
10Ω
R5
than 3ms, the discharge-current comparator is tripped,
setting DSO, CGO, and TKO high.
Discharge-current fault is latched and is not reset until
the MAX1894/MAX1924 detect a reversal in the direc-
tion of current flow. To reverse the current flow, a
charger must be applied (Figure 6).
The MAX1894/MAX1924 protect against a shorted
pack by monitoring the voltage developed across
R
(V
pack-short comparator is tripped, setting CGO, DSO,
and TKO high.
15
14
13
3
4
5
6
7
8
9
2
1
SENSE
PS_TH
DSO
CGO
TKO
B4P
B3P
IC3
B2P
IC2
B1P
IC1
BN
V
CC
. If V
, typically 405mV) for more than 450µs, the
Pack-Short Current Fault Protection
MAX1894X
MAX1924X
16
10
PKN
SRC
RSENSE
SHDN
CTL
exceeds the pack-short threshold
12
11
BN
C5
2.2µF
CONTROLLER
MICRO-