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PDF BL4054B Data sheet ( Hoja de datos )
| Número de pieza | BL4054B | |
| Descripción | 800mA Standalone Linear Li-Ion Battery Charger | |
| Fabricantes | BELLING | |
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BL4054/BL4054B
800mA Standalone Linear Li-Ion Battery Charger
with Thermal Regulation in SOT23-5/TSOT23-5
FEATURES
Programmable Charge Current Up to 800mA
No MOSFET, Sense Resistor or Blocking
Diode Required
Preset 4.2V Charge Voltage with ±1%
Accuracy
Charge Current Monitor Output for Gas
Gauging
Thermal Regulation Maximizes Charge Rate
Without Risk of Overheating
Charges Single Cell Li-Ion Batteries Directly
from USB Port
Over-Voltage Protect
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 and Smart Phones
Charging Docks and Cradles
BlueTooth Applications
PDAs
MP3/MP4/MP5 Players
DESCRIPTION
The BL4054/BL4054B 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 architecture.
Thermal feedback regulates the charge current to
limit the die temperature during high power
operation or high ambient temperature. The
charge voltage is fixed at 4.2V, and the charge
current can be programmed externally with a
single resistor. The BL4054/BL4054B automatical
-ly 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/BL4054B
automatically enters a low current state, dropping
the battery drain current to less than 2µΑ. The
BL4054/BL4054B 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 termination and the
presence of an input voltage.
The only difference between BL4054 and
BL4054B is that at power on, BL4054 will check
the battery voltage first, it will not start charging
unless the battery voltage is below the
auto-rechrage threshold. BL4054B does not
perform this check. So BL4054B can guarantee
the high battery capacity at all time, while BL4054
can prevent the battery from being repeatedly
charged in some specific applications.
ORDERING INFORMATION
BL4054/BL4054B – XX X X XXX
TYPICAL APPLICATION
VCC
4.5V to 6.5V
Package:
RN: SOT23-5
TRN: TSOT23-5
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
1uF
VCC
BAT
BL4054/BL4054B
PROG
GND
600mA
1.65k
4.2V
Li-Ion
Battery
600mA Application Circuit
PPMIC BU
BL4054/BL4054B Rev 1.4
5/2009
www.belling.com.cn
Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited
©2009 Belling All Rights Reserved
1
1 page  
BL4054/BL4054B
800mA Standalone Linear Li-Ion Battery Charger
with Thermal Regulation in SOT23-5/TSOT23-5
Electrical Characteristics (Note 5) (VCC = 5V, TA = 25°C, unless otherwise noted.)
Symbol
Parameter
Conditions Min
Typ
Max
ISPLYCHRG
IBATCHRG
VPROGCHRG
Charge Mode Supply Current (Note6)
Charge Mode Battery Current
PROG Pin Voltage
RPROG=2kΩ
RPROG =10kΩ
RPROG =2kΩ
RPROG =10kΩ
RPROG =2kΩ
RPROG =10kΩ
465mA
93mA
0.93V
0.93V
300µA
2000µA
2000µA
500mA 535mA
100mA 107mA
1V 1.07V
1V 1.07V
ISPLYSTBY
Standby Mode Supply Current
100µA 500µA
IBATSTBY
Standby Mode Battery Current
0 -2.5µA -6µA
ISPLYMSD
Manual Shutdown Mode Supply Current
90µA
IBATMSD
Manual Shutdown Mode Battery Current
-2µA
0
2µA
VPROGCLMP
ISPLYASD
IBATASD
ISPLYUVLO
PROG Pin Clamp Voltage
Automatic Shutdown Mode Supply
Current
Automatic Shutdown Mode Battery
Current
UVLO Mode Supply Current
2V
-2µA
25µA
0
25µA
3V
50µA
2µA
50µA
IBATUVLO
UVLO Mode Battery Current
-2µA
2µA
IBATSLEEP
Sleep Mode Battery Current
-1µA
1µA
VFLOAT
ITRIKL
VTRIKL
Float Voltage
Trickle Charge Current
Trickle Charge Threshold
4.158V
RPROG =2kΩ 20mA
RPROG =10kΩ 5mA
2.8V
4.2V
50mA
10mA
2.9V
4.242V
70mA
15mA
3V
VTRIKL, HYS
Trickle Charge Hysteresis
60mV 100mV 150mV
VUVLO
UVLO Threshold
3.7V 3.9V 4.1V
VUVLO, HYS
UVLO Hysteresis
150mV 200mV 300mV
VOVP
Input Over-Voltage Protect Threshold
6.8V 7V 7.2V
VOVP, HYS
Input Over-Voltage Protect Hysteresis
200mV
PPMIC BU
BL4054/BL4054B Rev 1.4
5/2009
www.belling.com.cn
Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited
©2009 Belling All Rights Reserved
5
5 Page 
BL4054/BL4054B
800mA Standalone Linear Li-Ion Battery Charger
with Thermal Regulation in SOT23-5/TSOT23-5
PROG pin. This reduces the battery drain
current to less than 2µA and the supply
current to less than 50µA. A new charge
cycle can be initiated by reconnecting the
program resistor.
In manual shutdown, the CHRGb pin is in a
weak pull-down state as long as VCC is high
enough to exceed the UVLO conditions.
The CHRGb pin is in a high impedance
state if the BL4054/BL4054B is in under
voltage lockout mode: either VCC is within
100mV of the BAT pin voltage or insufficient
voltage is applied to the VCC pin.
Over-Voltage Protect
The BL4054/BL4054B has an internal
Over-Voltage Protect comparator, once the
input voltage VCC rises above 7V (VOVP), this
comparator will shut down the chip. This
feature can prevent the BL4054/BL4054B
from the over-voltage stress due to the input
transient at hot plug in. In this state, the
CHRGb pin will be high impedance. Once
the VCC falls back to safe range (VOVP - VOVP,
HYS), normal operation continues.
Automatic Recharge
Once the charge cycle is terminated, the
BL4054/BL4054B continuously monitors the
voltage on the BAT pin using a comparator
with a 2ms filter time (TRECHRG). A charge
cycle restarts when the battery voltage falls
below 4.05V (which corresponds to
approximately 80% to 90% battery capacity).
This ensures that the battery is kept at or
near a fully charged condition and
eliminates the need for periodic charge
cycle initiations. CHRGb output enters a
strong pull-down state during recharge
cycles.
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.
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
capacitance 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
operating 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
PPMIC BU
BL4054/BL4054B Rev 1.4
5/2009
www.belling.com.cn
Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited
©2009 Belling All Rights Reserved
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet BL4054B.PDF ] | |
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