MAX1898EUB41-T Maxim Integrated Products, MAX1898EUB41-T Datasheet - Page 10

• Manufacturer Part Number: MAX1898EUB41-T
• Description: Battery Management Linear Charger for 1-Cell Li+ Battery
• Manufacturer: Maxim Integrated Products

after use when charger power is available. The restart
feature can be configured in the following ways:
• Floating the RSTRT pin disables restart. Once the
• Ground the RSTRT pin to enable the default restart
• If desired, lower the restart-threshold voltage by con-
Linear Charger for Single-Cell Li+ Battery
Figure 6. Charger State Diagram
Table 2. External Transistors
10
PMOS
Fairchild NDT454P
PNP
Zetex FZT968
PNP
FCX717
battery is charged and the charge timer expires,
charging can only be started by cycling input power
to IN, or by toggling EN/OK. When the restart func-
tion is disabled, battery drain after charge comple-
tion is reduced to 4µA. With the restart function
enabled, battery drain current after charge comple-
tion is 40µA.
threshold of 4V for the MAX1898EUB42 and 3.9V for
the MAX1898EUB41. Once the battery is charged
and the charge timer expires, charging restarts when
the cell voltage drops to the restart-threshold voltage.
necting a resistor from RSTRT to GND. Select the
TRANSISTORS
EXTERNAL
______________________________________________________________________________________
DOTTED LINE INDICATES THE STATES THAT
ARE NOT AVAILABLE WHEN CT = 0 (TIMER DISABLED)
LED BLINKING AT 1.5Hz
FAULT
0.17V, V
0.32V, V
RESISTANCE
ICHARGE > 22%
RATING
TIMEOUT/4
EXPIRES AND
V
50mΩ
BATT
OF ISET
< 2.5V
CE(sat)
CE(sat)
100% CHARGER CURRENT
10% CHARGE CURRENT
PREQUALIFICATION
FAST CHARGE
LED = OFF
LED = ON
LED = ON
TOP OFF
V
BATT
VOLTAGE LIMIT
V
3hr TIMER STARTS
< 2.5V
BATT
> 2.5V,
(V)
-30
-15
-12
ICHARGE < 20%
OF ISET
TIMEOUT = 3hr
DISSIPATION (W)
TIMEOUT = 3hr
For MAX1898EUB42:
for V
For MAX1898EUB41:
for V
Note that if CT is grounded (charge timer disabled), the
restart function is also disabled.
resistor using the following equations:
POWER
RSTRT
RSTRT
CHARGER = OFF
3
3
1
SHUTDOWN
LED = OFF
R
R
RSTRT
RSTRT
values between 3V and 4V.
values between 3V and 3.9V.
V
V
IN
BATT
< 4.5V OR
> V
[ ]
[ ]
k
k
IN
ASYNCHRONOUS FROM
Ω
Ω
V
=
=
ANYWHERE
V
IN
BATT












< 4.5V OR
PACKAGE
V
V
SOT223
SOT223
(CHARGE COMPLETE)
69 275
66 822
SOT89
> V
RSTRT
RSTRT
1 4
1 4
CHARGER = OFF
RSTRT = GND AND
V
V
IN
BATT
BATT
.
.
.
.
LED = OFF
V
V
DONE
< 4.0V (MAX1898EUB42)
< 3.9V (MAX1898EUB41)
k
k
−
−
Ω
Ω
1
1












−
−
37 301
37 301
—
h
h
rating suitable for
0.5A charge or less
FE
FE
.
.
COMMENTS
= 160min, 1W
= 300min
k
k
Ω
Ω