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BL4056 데이터시트 PDF




BELLING에서 제조한 전자 부품 BL4056은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 BL4056 기능
기능 1A Lithium Ion Battery Linear Charger
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BL4056 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.



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BL4056 데이터시트, 핀배열, 회로
BL4056
1A Lithium Ion Battery Linear Charger BL4056
General Description
BL4056 is a complete constant-current/constant voltage
linear charger for single cell lithium-ion batteries. With a
thermally enhanced 8-PIN SOP package on the bottom
and low external component count make the BL4056
ideally suited for portable applications. Furthermore the
BL4056 is specifically designed to work within USB power
specifications.
No external sense resistor is needed and no blocking
diode is required due to the internal PMOSFET
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/4.34V,and the charge current can be
programmed externally with a single resistor. The BL4056
automatically terminates the charge cycle when the charge
current drops to 1/10th the programmed value after the final
float voltage is reached.
When the input supply (wall adapter or USB supply) is
removed the BL4056 automatically enters a low current
state dropping the battery drain current to less than
2µA.The BL4056 can be put into shutdown mode reducing
the supply current to 55µA.
Other features include Battery temperature monitor,
under-voltage lockout, automatic recharge and two status
pins to indicate charge and charge termination.
Features
●Protection of battery cell reverse connection
● Programmable charge current up to 1A
●No MOSFET sense resistor or blocking diode
required
●Complete linear Charger in SOP8 Package for
single Cell Lithium-Ion Batteries.
●Constant-Current/Constant-Voltage operation
with thermal regulation to maximize Rate
TyWpiicthaolucthriasrkgoefcoyvcelrehea1t0in0g0.mAh battery
● Preset 4.2V/4.34V charge voltage with ±1%
accuracy
● Automatic Recharge
● Two Status Indication for Charge status, no
battery and battery failure indicators
● C/10 charge termination
● 55µA supply current in shutdown
● 2.9V trickle current charge threshold
● Soft-Start limits inrush current
● Battery Temperature Sensing
Applications
●Cellular Telephones
●Digital Still Cameras
●MP3 Players
●Bluetooth Applications
●Portable Devices
●USB Bus-Powered Chargers
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V1.4




BL4056 pdf, 반도체, 판매, 대치품
Block Diagram
BL4056
Absolute Maximum Ratings
Parameter
Input supply voltage : VCC
PROG pin voltage
BAT pin voltage
TEMP pin voltage
pin voltage
pin voltage
CE pin voltage
Rating
-0.38
-0.3VCC+0.3
-0.37
-0.310
-0.310
-0.310
-0.310
Unit
V
V
V
V
V
V
V
BAT pin current
1200
mA
PROG pin current
Maximum junction temperature
Operating ambient temperature :Topa
Storage temperature :Tstr
Soldering temperature and time
1200
145
-4085
-65125
+260Recommended 10S
µA
Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage.
These values must therefore not be exceeded under any conditions.
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V1.4

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BL4056 전자부품, 판매, 대치품
BL4056
Description of the Principle
The BL4056 is a complete constant-current/constant-voltage linear charger for single cell lithium-ion batteries.
Constant-current/constant-voltage to charger batter by internal MOSFET .It can deliver up to 1A of charge
current .No blocking diode or external current sense resistor is required. BL4056 include two Open-Drain charge
status Pins: Charge status indicator
and battery failure status output
.
The internal thermal regulation circuit reduces the programmed charge current if the die temperature attempts to
rise above a preset value of approximately 145. This feature protects the BL4056 from excessive temperature, and
allows the user to push the limits of the power handling capability of a given circuit board without risk of damaging the
BL4056 or the external components. Another benefit of adopting thermal regulation is that charge current can be set
according to typical, not worst-case, ambient temperatures for a given application with the
assurance that the charger will automatically reduce the current in worst-case conditions.
The charge cycle begins when the voltage at the VCC pin rises above the UVLO level, a current set resistor is
connected from the PROG pin to ground, and the CE pin is pulled above the chip enable threshold. The
pin
outputs a logic low to indicate that the charge cycle is on going. At the beginning of the charge cycle, if the battery
voltage is below 2.9V, the charge is in precharge mode to bring the cell voltage up to a safe level for charging. The
charger goes into the fast charge constant-current mode once the voltage on the BAT pin rises above 2.9 V. In
constant current mode, the charge current is set by RPROG. When the battery approaches the regulation voltage
4.2V/4.34V, the charge current begins to decrease as the BL4056 enters the constant-voltage mode. When the
current drops to charge termination threshold, the charge cycle is terminated, and
pin assumes a high
impedance state to indicate that the charge cycle is terminated and
pin is pulled low. The charge termination
threshold is 10% of the current in constant current mode. To restart the charge cycle, remove the input voltage and
reapply it, or momentarily force CE pin to 0V. The charge cycle can also be automatically restarted if the BAT pin
voltage falls below the recharge threshold. The on-chip reference voltage, error amplifier and the resistor divider
provide regulation voltage with 1% accuracy which can meet the requirement of lithium-ion and lithium polymer
batteries. When the input voltage is not present, or input voltage is below VBAT, the charger goes into a sleep mode,
dropping battery drain current to less than 3µA. This greatly reduces the current drain on the battery and increases
the standby time. The charger can be shutdown by forcing the CE pin to GND.
The charging profile is shown in the following figure:
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