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PDF BL8572 Data sheet ( Hoja de datos )
| Número de pieza | BL8572 | |
| Descripción | Li-ion battery charger | |
| Fabricantes | BELLING | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de BL8572 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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BL8572
■ GENERAL DESCRIPTION
The BL8572 is a single cell, fully integrated
constant current (CC)/constant voltage (CV) Li-ion
battery charger. Its compact package with
minimum external components requirement makes
the BL8572 ideal for portable applications.
No external sense resistor or blocking diode is
necessary for the BL8572. Build-in thermal
feedback mechanism regulates the charge current
to control the die temperature during high power
operation or at elevated ambient temperature.
The BL8572 has a pre-charge function for trickle
charging deeply discharged batteries. The fast
charge current can be programmed by an external
resistor. CV regulation mode is automatically
enabled once the battery’s charging curve reaches
the constant voltage portion. The output current
then decays and is finally terminated once the
charge current drops to 1/10th of the programmed
value. The BL8572 keeps monitoring the battery
voltage and enables a new charge cycle once the
voltage drops by 150mV below the CV value.
Power supply state is constantly monitored and the
battery drain current is reduced to minimum value
automatically when the BL8572 senses a lack of
input power. In its shutdown mode, the BL8572
can reduce the supply current to less than 25µA. A
status pin outputs a logic HIGH/LOW to indicate
the charging status and the presence of power
supply.
Other features include charge current monitor,
under-voltage lockout.
■ APPLICATION CIRCUIT
■ FEATURES
• Standalone Capability with no
Requirement of External MOSFET, Sense
Resistor or Blocking Diode.
• Complete Linear Charger in Compact
Package for Single Cell Lithium-Ion
Batteries
• Programmable Pre-charge, Fast Charge
and Termination Current.
• Constant-Current/Constant-Voltage
Operation with Thermal Regulation to
Maximize Charge Rate Without Risk of
Overheating
• Charges Single Cell Li-Ion Batteries
Directly from USB Port
• Preset 4.2V Charge Voltage with ±1%
Accuracy
• Automatic Recharge
• Charge Status Output Pin
• C/10 Charge Termination
• 25µA Supply Current in Shutdown
• 2.9V Trickle Charge Threshold
• Soft-Start Limits Inrush Current
• Available in 5-Lead SOT-23 Package
■ APPLICATIONS
• Cellular Telephones, PDAs, MP3 Players
• Charging Docks and Cradles
• Bluetooth Applications
http://www.belling.com.cn
-1-
Total 11 Pages
1 page  
■ TYPICAL CHARACTERISTICS
VCC=5V, Ta=25°C, unless otherwise noted.
Charge Current vs Battery Voltage
(VCC=4.5V)
600
500
400
300
200
100
0
2.5
3 3.5 4 4.5
Vbat (V)
Rprog=2K
Rprog=2.5K
Rprog=3.3K
Rprog=5K
Rprog=10K
Charge Current vs PROG Pin Voltage
500
400
300
200
100
0
0
Rprog=2K
0.2 0.4 0.6 0.8
Vprog (V)
1
PROG Pin Current vs PROG Pin Voltage
(Pul-Up Current)
3.0
2.5
2.0
1.5
1.0
0.5
0.0
2.0
2.2 2.4 2.6
Vprog(V)
2.8
BL8572
Charge Current vs Supply Voltage
(Vbat=4.0V)
600
500
400
300
200
100
0
4.0
4.5 5.0 5.5
Vcc(V)
6.0
Rprog=2K
Rprog=3.3K
Rprog=10K
Rprog=2.5K
Rprog=5K
Regulated Voltage vs Supply Voltage
4.4
4.3
4.2
4.1
4.0
4.0
Ibat=40mA
4.5 5.0 5.5
Vcc(V)
6.0
PROG Pin Current vs PROG Pin Voltage
(Clamp Current)
0
-100
-200
-300
-400
-500
-600
-700
2.5
3.5 4.5
Vprog(V)
5.5
http://www.belling.com.cn
-5-
Total 11 Pages
5 Page 
BL8572
Figure 4. Using a Microprocessor to Determine
CHRG State
To detect the charge statues of the BL8572,
connect a microprocessor and force the digital
output pin (OUT) high and measure the voltage at
the CHRG pin, as shown in Figure 4.
The N-channel MOSFET will pull the pin voltage
low even with the 2K pull-up resistor. Once the
charge cycle terminates, the N-channel MOSFET
is turned off and a 20µA current source is
connected to the CHRG pin. The IN pin will then
be pulled high by the 2K pull-up resistor. To
determine if there is a weak pull-down current, the
OUT pin should be forced to a high impedance
state. The weak current source will pull the IN pin
low through the 820K resistor; if CHRG is high
impedance, the IN pin will be pulled high,
indicating that the part is in a UVLO state.
■ PACKAGING INFORMATION
(Units: mm)
http://www.belling.com.cn
- 11 -
Total 11 Pages
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet BL8572.PDF ] | |
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