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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 TyWpiicthaolucthriasrkgoefcoyvcelreh(ea1t0in0g0.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
Typical charge cycle(1000mAh battery)
BL4056
Ordering Information
Package Information
BL4056- VV X XX
Package: EP: ESOP8
Features: P: Standard (default, lead free) C: Customized
Part Number BL4056-42 BL4056-43
Top Mark
4056 AXYY ZZ
4056 BXYY ZZ
Output Voltage 42:4.2V 43:4.34V
Remark
X: Year YY: Week ZZ: Internal Code
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V1.4
Pin Configuration
BL4056
Pin Assignment
Pin Num. Symbol
Function
Temperature sense input Connecting TEMP pin to NTC thermistor’s output in Lithium ion battery pack. If TEMP 1 TEMP pin’s voltage is below 45% or above 80% of supply voltage VCC, this means that battery’s temperature is too low or too high, charging is suspended. The temperature sense function can be disabled by grounding the TEMP pin. Constant Charge Current Setting and Charge Current Monitor Pin The charge current is programmed by connecting a resistor RPROG from this pin to GND. When in precharge mode, the PROG pin’s voltage is regulated to 0.1V. When charging in constant-current mode this pin’s voltage is regulated to 1V. In all modes during 2 PROG charging, the voltage on this pin can be used to measure the charge current using the
3 4 5 6 7 8
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GND VCC BAT
CE
following formula:
Ground
Positive input supply voltage
Provides power to the internal circuit. When VCC drops to within 80mV of the BAT pin voltage, the BL4056 enters low power sleep mode, dropping IBAT to less than 2µA.
Battery connection Pin
Connect the positive terminal of the battery to this pin. Dropping BAT pin’s current to
less than 2µA when IC in disable mode or in sleep mode. BAT pin provides charge
current to the battery and provides regulation voltage of 4.2V/4.34V.
Charge terminated status output
is pulled low by an internal switch to indicate a battery charge terminated; this
means Charge termination. Otherwise
pin is in high impedance state.
Open-Drain charge status output
When the battery is being charged, the
pin is pulled low by an internal switch,
otherwise,
pin is in high impedance state.
Chip enable input
A high input will put the device in the normal operating mode. Pulling the CE pin to low
level will put the BL4056 into disable mode. The CE pin can be driven by TTL or CMOS
logic level.
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V1.4
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 -0.3~8 -0.3~VCC+0.3 -0.3~7 -0.3~10 -0.3~10 -0.3~10 -0.3~10
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 -40~85 -65~125 +260(Recommended 10S)
µA ℃ ℃ ℃ ℃
Caution: The a.