MAX8568B Maxim Integrated Products, MAX8568B Datasheet - Page 10

• Manufacturer Part Number: MAX8568B
• Description: (MAX8568A/B) Complete Backup-Management ICs
• Manufacturer: Maxim Integrated Products

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Charge current is set by a resistor connected from
CHGI to GND (R5 in Figure 7). The acceptable resistor
range is from 50kΩ to 1800kΩ. R
the following.
Complete Backup-Management ICs
for Lithium and NiMH Batteries
Figure 1. Timing Diagram
10
STEP-UP DC-DC CONVERTER
R
______________________________________________________________________________________
CHGI
( )
k
Ω
CHARGER
MEM OUT
Applications Information
=
I/O OUT
MEM IN
I/O IN
INOK




OD1
LDO
OD2
BK
41 2
IN
Setting the Charge Current
.
×
(
I
V
CHG
IN
2.43V
−
V
( )
mA
BK
CHGI
)
+
679 4
is calculated by
.




1 1641
.
50µs
where V
up battery. This is the fast-charge current for both
NiMH and lithium batteries. For NiMH batteries, the
trickle charge is 10% of the fast-charge current.
The MAX8568 can charge a lithium-type backup bat-
tery from the main battery connected at IN. Connect
NI/LI to GND for lithium backup battery charging.
STRTV is unused and should be connected to GND in
lithium charge mode.
BK
is the nominal voltage of the charged back-
Using a Rechargeable Lithium
Backup Battery
1.12V
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