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CN3703 の電気的特性と機能

CN3703のメーカーはCONSONANCEです、この部品の機能は「Standalone Li-ion Battery Charger」です。


製品の詳細 ( Datasheet PDF )

部品番号 CN3703
部品説明 Standalone Li-ion Battery Charger
メーカ CONSONANCE
ロゴ CONSONANCE ロゴ 




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CN3703 Datasheet, CN3703 PDF,ピン配置, 機能
CONSONANCE
5A, Standalone Li-ion Battery Charger
CN3703
General Descriptions:
The CN3703 is a PWM switch-mode lithium
ion battery charger controller for 3 cell li-ion
battery in a small package using few external
components.
The CN3703 is specially designed for
charging lithium ion batteries with constant
current and constant voltage mode. In constant
voltage mode, the regulation voltage is fixed
at 12.6V with ±1% accuracy. The constant
charging current is programmable with a
single sense resistor.
Deeply discharged batteries are automatically
trickle charged at 15% of the programmed
constant charging current until the cell voltage
exceeds 8.4V. The charge cycle is terminated
once the charging current drops to a level set
by an on-chip resistor and an external resistor,
and a new charge cycle automatically restarts
if the battery voltage falls below 12V. CN3703
will automatically enter sleep mode when
input voltage is lower than battery voltage.
Other features include undervoltage lockout,
battery temperature monitoring and status
indication, etc.
CN3703 is available in a space-saving 16-pin
TSSOP package.
Applications:
Notebook Computers
Model Plane
Battery-Backup Systems
Portable Industrial and
Medical Equipment
Standalone Battery Chargers
Features:
Wide Input Voltage: 7.5V to 28V
Complete Charger Controller for 3
cell Lithium-ion Battery
Charge Current Up to 5A
High PWM Switching Frequency:
300KHz
Constant Charging Voltage
Accuracy: ±1%
Charging Current is programmed
with a sense resistor
Automatic Conditioning of Deeply
Discharged Batteries
End-of-Charge Current can be set
by an external resistor
Battery Temperature Monitoring
Automatic Recharge
Charger Status Indication
Soft Start
Battery Overvoltage Protection
Operating Ambient Temperature
40to 85
Available in 16 Pin TSSOP Package
Pb-free , RoHS Compliant,
and Halogen Free
Pin Assignment:
VG 1
PGND 2
GND 3
CHRG 4
DONE 5
TEMP 6
EOC 7
COM1 8
CN3703
16 DRV
15 VCC
14 BAT
13 CSP
12 NC
11 COM3
10 test
9 COM2
www.consonance-elec.com
Rev.1.2
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CN3703 pdf, ピン配列
CONSONANCE
Pin Description:
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Name
VG
PGND
GND
CHRG
DONE
TEMP
EOC
COM1
COM2
test
COM3
NC
CSP
BAT
VCC
DRV
Descriptions
Internal Voltage Regulator. VG internally supplies power to gate driver, connect a
100nF capacitor between VG pin and VCC pin.
Power Ground.
Analog Ground.
Open-Drain Output. When the battery is being charged, this pin is pulled low by an
internal switch. Otherwise this pin is in high impedance state.
Open-Drain Output. When the charging is terminated, this pin is pulled low by an
internal switch. Otherwise this pin is in high impedance state.
Battery Temperature Monitoring Input. Connect an NTC resistor from this pin to
GND.
End-of-Charge Current Setting Pin. Connect this pin to GND directly or via a
resistor.
Loop Compensation Input 1. Connect a 470pF capacitor from this pin to GND.
Loop Compensation Input 2. Connect a 220nF capacitor in series with an 120Ω
resistor from this pin to GND.
Test pin. Connected this pin to GND.
Loop Compensation Input 3. Connect an 100nF capacitor from this pin to GND.
No Connection
Positive Input for Charging Current Sensing. This pin and the BAT pin measure
the voltage drop across the sense resistor RCS, to provide the current signals
required.
Battery Voltage Sensing Input and the Negative Input for Charging Current
Sensing. A precision resistor divider sets the regulation voltage on this pin in
constant voltage mode.
External DC Power Supply Input. VCC is also the power supply for internal
circuit. Bypass this pin with a capacitor.
Drive the gate of external P-channel MOSFET.
Absolute Maximum Ratings
Voltage from VCC, VG, DRV, CHRG, DONE to GND…….…0.3V to 30V
Voltage from CSP, BAT to GND………………………………0.3V to 28V
Voltage from COM3 to GND………………………………….6.5V
Voltage from Other Pins to GND………………………...……0.3V to VCOM3+0.3V
Storage Temperature………………………………………...…65---150
Operating Ambient Temperature………………………….……40---85
Lead Temperature(Soldering, 10 seconds)………………..……300
Stresses beyond those listed under ‘Absolute Maximum Ratings’ may cause permanent damage to the device. These are stress
ratings only and functional operation of the device at these or any other conditions above those indicated in the operational
sections of the specifications is not implied. Exposure to Absolute Maximum Rating Conditions for extended periods may affect
device reliability.
www.consonance-elec.com
Rev.1.2
3


3Pages


CN3703 電子部品, 半導体
CONSONANCE
Application Information
Undervoltage Lockout (UVLO)
An undervoltage lockout circuit monitors the input voltage and keeps the charger off if VCC falls below
6V(Typical).
Trickle Charge Mode
At the beginning of a charge cycle, if the battery voltage is below 8.4V, the charger goes into trickle charge
mode with the charge current reduced to 15% of the full-scale current.
Charge Current Setting
The full-scale charge current, namely the charge current in constant current mode, is decided by the following
formula:
Where:
ICH is the full scale charge current
RCS is the resistor between the CSP pin and BAT pin
End-of-Charge Current Setting
End-of-charge current can be set by connecting a resistor from EOC pin to GND, and is decided by the following
equation:
Where:
IEOC is the end-of-charge current in Ampere
Rext is the external resistance from EOC pin to GND in Ω. Rext can not be great than 100KΩ,
otherwise the charging may not be terminated correctly.
RCS is the current sense resistance between CSP pin and BAT pin in Ω
It is our interest to calculate the ratio between IEOC and ICH:
When Rext=0Ω, the minimum IEOC/ICH=9.17%
When Rext=100KΩ, the maximum IEOC/ICH=73%
Automatic Battery Recharge
After the charge cycle is completed and both the battery and the input power supply (wall adapter) are still
Connected, a new charge cycle will begin if the battery voltage drops below 12V due to self-discharge or
external loading. This will keep the battery capacity at more than 80% at all times without manually restarting
the charge cycle.
Battery Temperature Monitoring
A negative temperature coefficient (NTC) thermistor located close to the battery pack can be used to monitor
battery temperature and will not allow charging unless the battery temperature is within an acceptable range.
Connect a 10kΩ thermistor from the TEMP pin to ground. Internally, for hot temperature, the low voltage
www.consonance-elec.com
Rev.1.2
6

6 Page



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部品番号部品説明メーカ
CN3703

Standalone Li-ion Battery Charger

CONSONANCE
CONSONANCE


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