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PDF APL3202 Data sheet ( Hoja de datos )
| Número de pieza | APL3202 | |
| Descripción | Li+ Battery Charger | |
| Fabricantes | ANPEC | |
| Logotipo |  |
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APL3202
Li+ Battery Charger with Thermal Regulation
Features
General Description
• Programmable Charge Current Up to 500mA
• Charge Status Output Pin
• Soft-Start Limits Inrush Current
• 4.2V Charge Termination Voltage with ±1%
Accuracy
•
45mA Pre-charge Current (R =2K)
SET
• Thermal Regulation Simplifies Board Design
• Enable/Disable Control
• Available in a SOT-23-5 Package
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• Bluetooth Applications
• MP3 Players
• Cell Phones
• Wireless Appliances
The APL3202 is a constant-current/constant-voltage lin-
ear charger for single cell Li+ batteries. The APL3202
needs no external MOSFETs or diodes, and accepts in-
put voltages up to 6.5V. The small package and low ex-
ternal component counts make the APL3202 an idea part
for portable applications.
On-chip thermal regulation protects the APL3202 from
excessive temperature and optimizes the board design
for compact size and typical thermal conditions. When
the junction temperature reaches the thermal regulation
threshold, the charger does not shut down but simply
reduces the charge current. Charge current can be pro-
grammed by connecting an external resistor from ISET
pin to GND. Using an external MOSFET to disconnect the
resistor from ground shuts down the charger, and re-
duces the input supply current down to 25µA. The
APL3202 also has the STAT pin to indicate charge status.
The APL3202 is available in a SOT-23-5 package, and
operates over the -40°C to +85°C temperature range.
Pin Configuration
Simplified Application Circuit
APL3202
5V
Adapter
VIN STAT
APL3202
ISET BATT
GND
Li+
Battery
STAT 1
GND 2
BATT 3
SOT-23-5
(Top View)
5 ISET
4 VIN
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
Copyright © ANPEC Electronics Corp.
Rev. A.3 - Mar., 2012
1
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
1 page  
APL3202
Typical Operating Characteristics
Refer
to
the
typical
application
circuit,
V =5V,
IN
T=
A
25°C,
unless
otherwise
specified.
ISET Pin Voltage vs. VIN Supply Voltage
1.015
1.010
VBATT = 4V
RSET = 10k
1.005
1.000
0.995
0.990
0.985
4
4.5 5 5.5
VIN Supply Voltage (V)
6
Charge Current vs. ISET Pin Voltage
0.5
VIN = 5V
0.4 RSET= 2K
0.3
0.2
0.1
0
0
0.2 0.4
0.6 0.8
1
ISET Pin Voltage (V)
ISET Pin Voltage vs. Junction
Temperature
1.04
1.03
1.02
VIN = 5V
VBATT = 4V
RSET = 10K
1.01
1
0.99
0.98
0.97
0.96
-50
-25 0 25 50 75
Junction Temperature (oC)
100
ISET Pin Pull-Up Current vs. Junction
Temperature
4.5
4 VIN = 6.5V
VBATT = 4.3V
3.5 VSET = 0V
3
2.5
2
1.5
1
0.5
0
-50 -25
0
25 50 75 100
Junction Temperature (oC)
ISET Pin Pull-Up Current vs. ISET Pin
Voltage
3
VIN = 5V
2.5 VBATT = 4.3V
2
BATT Charge Termination Voltage
vs. Junction Temperature
4.3
VIN = 5V
RSET = 10K
4.25
1.5 4.2
1
4.15
0.5
00 1 2 3 4
ISET Pin Voltage (V)
5
4.1
-50
-25 0 25 50 75
Junction Temperature (oC)
100
Copyright © ANPEC Electronics Corp.
Rev. A.3 - Mar., 2012
5
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
5 Page 
APL3202
Function Description
Charge Cycle
When the APL3202 is powered with a battery connected,
the IC firstly detects if the cell voltage is ready for full
charge current. If the battery voltage is below pre-charge
threshold (2.9V typ.), the device supplies 1/10 the pro-
grammed charge current. On the contrary, when the bat-
tery voltage is over the pre-charge threshold, the device
supplies the full charge current, as programmed by RSET
from ISET pin to GND. When the battery voltage ap-
proaches the 4.2V termination voltage, the device enters
constant-voltage mode and the full charge current gradu-
ally decreases until the charge current drops to the termi-
nation current threshold, which is equal to 1/10 full charg-
ing current, and the IC stops charging (see Figure 1).
Full Charge Current Setting
The full charge current is programmed by connecting a
resistor from the ISET pin to ground. The full charge cur-
rent is 1000 times of the current flowing out of the ISET
pin and can be calculated by the following equation:
ICHG = KSET × VSET
RSET
where
V is ISET regulation voltage (1V, typical).
SET
KSET is the charging current set factor (1000, typical).
The charging current set factor and the ISET regulation
voltage are shown in the Electrical Characteristics. The
ISET regulation voltage is reduced by thermal regulation
function.
Charge Termination Detection and Recharge
Charging is terminated when ICHG falls to 10% of the full
charge current set by R and the charger is in voltage
SET
mode (VBATT is nearly 4.2V). The charge termination is
detected by monitoring the ISET pin. When the ISET pin
voltage falls below 0.1V and takes longer than T (1ms,
TERM
typical), charging is terminated. The STAT output keeps
high state when the charger operates in standby mode.
After charge termination, the battery voltage is monitored
by the APL3202 continuously. If the battery voltage drops
below 4.05V and takes longer than TRECHARGE (2ms, typical),
a new charge cycle starts to recharge the battery.
Manual Shutdown
The ISET pin provides two functions: connecting the re-
sistor RSET from the ISET pin to ground to set the full
charge current; and disconnecting the R from GND to
SET
shut down the device. Once the RSET is disconnected, an
internal 2.5µA current pulls the ISET pin high. When the
ISET pin voltage reaches the 1.21V shutdown threshold
voltage, the device enters shutdown mode. In shutdown
mode, the charging stops, the VIN supply current drops
to 25µA and the battery drain current is below 1µA. Re-
connecting RSET to ground enables the charger to opera-
tion normally. The STAT output keeps high state when the
charger is turned to shutdown mode.
Thermal Regulation
The APL3202 is thermally regulated to keep the junction
temperature at 120°C. When the junction temperature
reaches 120°C, the charger does not shut down but re-
duces charge current to keep the junction temperature at
120°C. This feature protects the APL3202 from exces-
sive temperature and allows the charger to operate with
maximum power dissipation by reudcing the charge cur-
rent and optimizes the board design for compact size
and typical thermal conditions.
Charge Status Output (STAT)
The STAT is an open-drain output. When the charger is in
charge mode, the STAT output is in pull-low state. Until
the charge current drops to the termination current
threshold, the charging stops, and the STAT output is in
high impedance state.
Copyright © ANPEC Electronics Corp.
Rev. A.3 - Mar., 2012
11
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
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| PDF Descargar | [ Datasheet APL3202.PDF ] | |
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