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CN3082 데이터시트 PDF




CONSONANCE에서 제조한 전자 부품 CN3082은 전자 산업 및 응용 분야에서
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부품번호 CN3082 기능
기능 Multi-Chemistry Battery Charger
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CN3082 데이터시트, 핀배열, 회로
如韵电子 CONSONANCE
Multi-Chemistry Battery Charger for Solar-Powered Systems
CN3082
General Description:
CN3082 is a mutli-chemistry battery charge control
chips for single cell lithium batteries, lithium iron
phosphate and single or two to four nickel-metal
hydride batteries. The device contains an on-chip
power MOSFET and eliminates the need for the
external sense resistor and blocking diode. CN3082
is specifically designed to work within USB power
specifications. Thermal feedback regulates the
charge current to limit the die temperature during
high power operation or high ambient temperature.
Chip integrates a high-precision voltage comparator,
with 1% accuracy, you can accurately set the
constant current charge termination voltage. An
on-chip 8-bit ADC can adjust charging current
automatically based on the output capability of input
power supply, so CN3082 is ideally suited for solar
powered system.
The charge current can be programmed externally
with a single resistor. When the input supply is
removed, the CN3082 automatically enters a low
power sleep mode , dropping the battery drain
current to less than 3uA. Other features include
undervoltage lockout, automatic recharge, battery
temperature sensing and charging/termination
indicator.
The CN3082 is available in 8-pin SOP8 package.
Applications:
Cell Phone
Digital Camera
Electronic Dictionary
Portable Devices
The need for lithium batteries, nickel
metal hydride batteries, lithium iron
phosphate and lead-acid battery charging
Features:
Suitable for the USB port or AC adapter
On-chip Power MOSFET
Constant current charge voltage accuracy of
1%
On-chip 8-bit ADC can adjust charging current
automatically based on the output capability of
input power supply
Suitable for Solar-Powered System
Precharge Conditioning for Reviving Deeply
Discharged Cells and Minimizing Heat
Dissipation During Initial Stage of Charge
Continuous Programmable Charge Current Up
to 1000mA
Constant-Current/Constant-Temperature
Operation with Thermal Regulation to
Maximize Charge Rate Without Risk of
Overheating
Automatic Low-Power Sleep Mode When Input
Supply Voltage is Removed
Status Indication LED drive or MCU interface
Automatic Recharge
Battery Temperature Sensing
Available in SOP-8 Package
Pb-free Available
Pin Assignment
TEMP 1
ISET 2
GND 3
VIN 4
8 FB
CN3082
7 CHRG
6 IMIN
5 BAT
www.consonance-elec.com
REV 1.1
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CN3082 pdf, 반도체, 판매, 대치품
Pin Description
Pin No.
Name
1 TEMP
2 ISET
3 GND
4 VIN
5 BAT
6 IMIN
7
8 FB
Function Description
Temperature Sense Input. Connecting TEMP pin to NTC thermistor’s output
in Lithium ion battery pack. If TEMP pin’s voltage is below 45% or above 80%
of supply voltage VIN for more than 0.15S, this means that battery’s
temperature is too high or too low, charging is suspended. If TEMP’s voltage
level is between 45% and 80%of supply voltage for more than 0.15S, battery
fault state is released, and charging will resume.
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 set by connecting a resistor RISET from this pin to GND.
When in precharge and Continuous charge mode, the ISET pin’s voltage is
regulated to 0.44V. When in constant charge current mode, the ISET pin’s
voltage is regulated to 2.2V.
The constant current is determined by:
ICH = 1950VRISET (A)
In the pre-charge mode, the charge current is 20% of the constant charging
current.
Ground Terminal.
Positive Input Supply Voltage. VIN is the power supply to the internal
circuit. When VIN drops to within 40mv of the BAT pin voltage, CN3082
enters low power sleep mode, dropping BAT pin’s current to less than 3uA.
Battery Connection Pin. Connect the positive terminal of the battery to
BAT pin. BAT pin draws less than 3uA current in chip disable mode or in sleep
mode. BAT pin provides charge current to the battery.
Set the Continuous current. In the constant current charge mode, when the
battery voltage reaches the set charge termination voltage, constant current
charging mode ends, CN3082 access to continuous charge mode, and to
continuous the current to charge the battery, but as long as the input voltage,
CN3082 would have been to continuous the current to the battery.
Continuous the current is determined by:
IMIN=(0.44RISET0.44RIMINVINRIMIN886
If the type is negative, it means that Continuous the current is 0 . Therefore, to
continuous the current range can be set from 0 to constant charging current of
20%.
Open Drain Charge Status Output. When CN3082 is the pre-charging
and constant current charging mode,
pin is pulled low by an internal
switch, otherwise
pin is in high impedance state.
Battery voltage feedback input. Battery voltage through this pin back to the
CN3082.
When the FB pin voltage is less than 1.54V ,CN3082 in a precharge mode;
When the FB pin voltage is greater than 1.54V and less than 2.445V, CN3082
in a constant charge mode;When the FB pin voltage up to 2.445V , CN3082
end of the constant current charge mode, access to the Continuous charge
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CN3082 전자부품, 판매, 대치품
Figure 4 Charging Profile
Application Information
Undervoltage Lockout (UVLO)
CN3082 has an internal undervoltage lockout circuit monitors the input voltage and keeps the charger in
shutdown mode until VIN rises above the undervoltage lockout voltage.
Sleep mode
There is an on-chip sleep comparator in CN3082. The comparator keeps the charger in sleep mode if VIN falls
below sleep mode threshold(VBAT+20mv). Once in sleep mode, the charger will not come out of sleep mode
until VIN rises 90mv above the battery voltage.
Charging Current limited by the Output capability of Input Power Supply
If the output capability of input power supply is less than the charging current set by the resistor at ISET pin,
then the on-chip 8-bit ADC will begin to function to adjust the charging current based on the output capability
of input power supply. In this case, the charging current may be less than the value set by the resistor at ISET
pin, but it is maximized to the output capability of input power supply. So the charging current can be set
according to the maximum output capability of input power supply, not the worst case.. Therefore , it is very
suitable for the use of solar panels and other current limited output voltage of a battery charging applications.
Precharge mode
If the battery voltage feedback input FB pin voltage falls below 1.54V, CN3082 goes into precharge mode , and
the charge current is 20% of fast charge current in constant current mode.
Constant Current charge state
If the battery voltage feedback input FB pin voltage greater than 1.54V, and less than 2.445V, the CN3082 is in
constant current charge status. In the constant current charging stage, charge current calculation formula is:
ICH = 1950V / RISET
Which, ICH is the charge current in amps
RISET is the ISET pin to ground resistance in ohms
For example, if you need 500 mA charge current, according to the following formula:
RISET = 1950V/0.5A = 3.9kΩ
For best stability over temperature and time, 1% metal film resistors are recommended.
REV 1.1
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CN3082

Multi-Chemistry Battery Charger

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