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MIC79110BML Scheda tecnica(PDF) 13 Page - Micrel Semiconductor

Il numero della parte MIC79110BML
Spiegazioni elettronici  Simple 1.2A Linear Li-Ion Battery Charger
PDF  14 Pages
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Produttore elettronici  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC79110BML Scheda tecnica(HTML) 13 Page - Micrel Semiconductor

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Micrel, Inc.
MIC79110
October 2007
13
M9999-102507
Auto Top-Off-Charger - Application Circuit
Lithium-Ion batteries will begin to lose their charge over
time. The MIC79110 can be configured to automatically
recharge the battery if the voltage drops below a certain
voltage. This minimum voltage is set by a resistor divider
at the battery and connected to the SD pin. When the
battery voltage falls below the minimum voltage, the SD
pin is pulled low to start the normal charging process.
4.2 V
VBat min
Deoc trip
Battery
charging
Vs
IBattery
VBattery
VBat min=0.975V(
R1
R2 +1)
R2=1meg
R1=(
VBat min
0.975 -1)
1
R2
Self discharge
4
1
2
3
Vbat set (4.2V)
Vbat low set
by divider.
Vbat
SD Voltage
1. SD not held low by active high DEOC because
DEOC Comparator’s inputs do not common-mode
to ground. Divider holds SD low so part can
start.
2. SD held low by divider.
3. SD held low by active high DEOC.
4. Divider voltage above SD threshold and DEOC
open.
5. Divider voltage drops below SD threshold and
charging begins again.
Top-Off-Charger with Internal Reset - Application
Circuit
R2
R1
3M
1M
LI-ion Battery
SD
VIN
RSET
SNS
BAT
VIN
GND
REOC
DEOC
AEOC
VIN
This circuit is similar to the auto top off charger circuit
mentioned above except that the DEOC pin is externally
triggered to restart the charging cycle. It still uses the
same resistor divider to set the minimum battery voltage
before the lithium-ion needs to be recharged.
Auto-Shutdown Using Shutdown Pin
The shutdown pin on the MIC79110 can be used to
automatically shutdown the battery charger when the
input voltage rises above a safe operating voltage. To
keep the part from heating up and entering thermal
shutdown, we can connect the shutdown pin to VIN using
a resistor divider. Use the following equation to setup the
maximum VIN.
1
R2
R1
V
(MAX)
V
SD
IN
+
=
The MIC79110 can be connected to a wall wart with a
rectified DC voltage and protected from over voltages at
the input.



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