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PDF CN3703 Data sheet ( Hoja de datos )
| Número de pieza | CN3703 | |
| Descripción | Standalone Li-ion Battery Charger | |
| Fabricantes | CONSONANCE | |
| Logotipo |  |
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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
－40℃ to ＋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
1
1 page  
CONSONANCE
Detailed Description:
The CN3703 is a constant current, constant voltage Li-Ion battery charger controller that adopts PWM
step-down (buck) switching architecture. The charge current is set by an external sense resistor (RCS) across the
CSP and BAT pins. The final battery regulation voltage in constant voltage mode is internally set to 12.6V for
CN3703 with 1% accuracy.
A charge cycle begins when the voltage at the VCC pin rises above the UVLO level and is greater than the
battery voltage by VSLPR. At the beginning of the charge cycle, if the battery voltage is less than 8.4V, the
charger goes into trickle charge mode. The trickle charge current is internally set to 15%(Typical) of the
full-scale current. When the battery voltage exceeds 8.4V, the charger goes into the full-scale constant current
charge mode. In constant current mode, the charge current is set by the external sense resistor RCS and an internal
200mV reference, so the charge current equals to 200mV/RCS. When the battery voltage approaches the
regulation voltage, the charger goes into constant voltage mode, and the charge current will start to decrease.
When the charge current drops to a level that is set by the resistor at EOC pin, the charge cycle is terminated,
the DRV pin is pulled up to VCC, and an internal comparator turns off the internal pull-down N-channel
MOSFET at the
pin to indicate that the charge cycle is terminated. During the charge cycle termination
status, another internal pull-down N-channel MOSFET at the
pin is turned on to indicate the termination
status.
To restart the charge cycle, just remove and reapply the input voltage. Also, a new charge cycle will begin if the
battery voltage drops below the recharge threshold voltage of 12V.
When the input voltage is not present, the charger goes into sleep mode.
A 10kΩ NTC (negative temperature coefficient) thermistor can be connected from the TEMP pin to ground for
battery temperature qualification. The charge cycle is suspended if the battery’s temperature is outside of the
acceptable range.
An overvoltage comparator guards against voltage transient overshoots (>8% of regulation voltage). In this case,
P-channel MOSFET are turned off until the overvoltage condition is cleared. This feature is useful for battery
load dump or sudden removal of battery.
The charging profile is shown in Figure 2.
Precharge
Phase
Constant Current
Phase
Constant Voltage
Phase
12.6V
8.4V
Charge Current
Battery Voltage
Charge terminated
Figure 2 The Charging Profile
www.consonance-elec.com
Rev.1.2
5
5 Page 
CONSONANCE
Package Information
Consonance does not assume any responsibility for use of any circuitry described. Consonance reserves the
right to change the circuitry and specifications without notice at any time.
www.consonance-elec.com
Rev.1.2
11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet CN3703.PDF ] | |
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