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PDF BL4054 Data sheet ( Hoja de datos )
| Número de pieza | BL4054 | |
| Descripción | 800mA Standalone Linear Li-Ion Battery Charger | |
| Fabricantes | Shanghai Belling | |
| Logotipo |  |
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BL4054
800mA Standalone Linear Li-Ion Battery Charger
with Thermal Regulation in Thin SOT
FEATURES
z Programmable Charge Current Up to
800mA
z No MOSFET, Sense Resistor or Blocking
Diode Required
z Preset 4.2V Charge Voltage with ±1%
Accuracy
z Charge Current Monitor Output for Gas
Gauging
z Thermal Regulation Maximizes Charge
Rate Without Risk of Overheating
z Charges Single Cell Li-Ion Batteries Dire-
ctly from USB Port
z Over-Voltage Protect
z Automatic Recharge
z Charge Status Output Pin
z C/10 Charge Termination
z 25μA Supply Current in Shutdown
z 2.9V Trickle Charge Threshold
z Soft-Start Limits Inrush Current
z Available in 5-Lead SOT-23 Package
APPLICATIONS
z Cellular and Smart Phones
z Charging Docks and Cradles
z Blue Tooth Applications
z PDAs
z MP3 Players
DESCRIPTION
The BL4054 is a complete constant-current /
constant voltage linear charger for single cell
Lithium-Ion batteries. No external sense
resistor is needed, and no blocking diode is
required due to the internal MOSFET archite-
cture. Thermal feedback regulates the charge
current to limit the die temperature during
high power operation or high ambient temper-
ature. The charge voltage is fixed at 4.2V,
and the charge current can be programmed
externally with a single resistor. The BL4054
automatically terminates the charge cycle
when the charge current drops to 1/10 the
programmed value after the final float voltage
is reached.
When the input supply (wall adapter or USB
supply) is removed, the BL4054 automatically
enters a low current state, dropping the
battery drain current to less than 2μΑ. The
BL4054 can be put into shutdown mode,
reducing the supply current to 25μA.
Other features include charge current monitor,
under-voltage lockout, automatic recharge
and a status pin to indicate charge termi-
nation and the presence of an input voltage.
ORDERING INFORMATION
BL4054 – XX X X XXX
Package:
TRN:TSOT23-5
RN:SOT23-5
Features:
P: Standard(default, lead free)
C: Customized
Trickle Charge
T: Trickle Charge
N: No Trickle Charge
Float Voltage
42……4.2V
43……4.3V
44……4.4V
TYPICAL APPLICATION
VCC
4.5V TO 6.5V
1μF VCC
BAT
BL4054
PROG
600mA
4.2V
Li-Ion
Battery
GND
1.65k
600mA Application Circuit
PPMIC BU
- 1 - www.belling.com.cn
1 page  
BL4054
800mA Standalone Linear Li-Ion Battery Charger
with Thermal Regulation in Thin SOT
Electrical Characteristics (Note 4) (VCC = 5V, TA = 25°C, unless otherwise noted.)
Symbol
ISPLYCHRG
IBATCHRG
VPROGCHRG
ISPLYSTBY
IBATSTBY
ISPLYMSD
IBATMSD
VPROGCLMP
ISPLYASD
IBATASD
ISPLYUVLO
IBATUVLO
IBATSLEEP
VFLOAT
ITRIKL
VTRIKL
VTRIKL, HYS
VUVLO
VUVLO, HYS
VOVP
VOVP, HYS
Parameter
Charge Mode Supply Current (Note5)
Charge Mode Battery Current
PROG Pin Voltage
Standby Mode Supply Current
Conditions Min
RPROG=2kΩ
RPROG =10kΩ
RPROG =2kΩ
RPROG =10kΩ
RPROG =2kΩ
RPROG =10kΩ
465mA
93mA
0.93V
0.93V
Typ Max
300μA
500mA
100mA
1V
1V
2000μA
2000μA
535mA
107mA
1.07V
1.07V
100μA 500μA
Standby Mode Battery Current
0 -2.5μA -6μA
Manual Shutdown Mode Supply Current
90μA
Manual Shutdown Mode Battery Current
-2μA
0
2μA
PROG Pin Clamp Voltage
2V 3V
Automatic Shutdown Mode Supply Current
25μA 50μA
Automatic Shutdown Mode Battery Current
-2μA
0
2μA
UVLO Mode Supply Current
25μA 50μA
UVLO Mode Battery Current
-2μA
2μA
Sleep Mode Battery Current
-1μA
1μA
Float Voltage
Trickle Charge Current
Trickle Charge Threshold
4.158V
RPROG =2kΩ
RPROG =10kΩ
20mA
5mA
2.8V
4.2V
50mA
10mA
2.9V
4.242V
70mA
15mA
3V
Trickle Charge Hysteresis
60mV 100mV 150mV
UVLO Threshold
3.7V
3.9V
4.1V
UVLO Hysteresis
150mV 200mV 300mV
Input Over-Voltage Protect Threshold
6.8V 7V 7.2V
Input Over-Voltage Protect Hysteresis
200mV
PPMIC BU
- 5 - www.belling.com.cn
5 Page 
BL4054
800mA Standalone Linear Li-Ion Battery Charger
with Thermal Regulation in Thin SOT
Applications Information
Stability Considerations
The constant-voltage mode feedback loop is
stable without an output capacitor provided a
battery is connected to the charger output.
With no battery present, an output capacitor is
recommended to reduce ripple voltage. When
using high value, low ESR ceramic capacitors,
it is recommended to add a 1Ω resistor in
series with the capacitor. No series resistor is
needed if tantalum capacitors are used.
BL4054 from excessive temperature and allo-
ws the user to push the limits of the power
handling capability of a given circuit board
without risk of damaging the BL4054. The
charge current can be set according to typical
(not worst-case) ambient temperature with the
assurance that the charger will automatically
reduce the current in worst-case conditions.
PROG
BL4054
GND
10k
RPROG
CHARGE
CURRENT
MONITOR
CIRCUITRY
CFILTER
In constant-current mode, the PROG pin is in
the feedback loop, not the battery. The
constant-current mode stability is affected by
the impedance at the PROG pin. With no
additional capacitance on the PROG pin, the
charger is stable with program resistor values
as high as 20k. However, additional capa-
citance on this node reduces the maximum
allowed program resistor thus it should be
avoided.
Average, rather than instantaneous, charge
current may be of interest to the user. For
example, if a switching power supply opera-
ting in low current mode is connected in
parallel with the battery, the average current
being pulled out of the BAT pin is typically of
more interest than the instantaneous current
pulses. In such a case, a simple RC filter can
be used on the PROG pin to measure the
average battery current as shown in Figure 2.
A 10k resistor has been added between the
PROG pin and the filter capacitor to ensure
stability.
Thermal Limiting
An internal thermal feedback loop reduces the
programmed charge current if the die temper-
ature attempts to rise above a preset value of
approximately 120°C. This feature protects the
Figure 2. Isolating Capacitive Load on PROG Pin
Power Dissipation
The conditions that cause the BL4054 to
reduce charge current through thermal feed-
back can be approximated by considering the
power dissipated in the IC. Nearly all of this
power dissipation is generated by the internal
MOSFET—this is calculated to be approxima-
tely:
PD = (VCC − VBAT ) • IBAT
where PD is the power dissipated, VCC is the
input supply voltage, VBAT is the battery
voltage and IBAT is the charge current. The
approximate ambient temperature at which the
thermal feedback begins to protect the IC is:
TA = 120°C − PD • θJA
TA = 120°C − (VCC − VBAT ) • IBAT • θJA
Example: An BL4054 operating from a 5V
USB supply is programmed to supply 400mA
full-scale current to a discharged Li-Ion battery
with a voltage of 3.75V. Assuming θJA is
150°C/W, the ambient temperature at which
the BL4054 will begin to reduce the charge
current is approximately:
TA = 120°C − (5V − 3.75V) • 400mA •150°C / W
TA = 45°C
The BL4054 can be used above 45°C ambient,
PPMIC BU
- 11 -
www.belling.com.cn
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet BL4054.PDF ] | |
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