Battery Charger. CN3702 Datasheet

CN3702 Charger. Datasheet pdf. Equivalent

CN3702 Datasheet
Recommendation CN3702 Datasheet
Part CN3702
Description Standalone Li-ion Battery Charger
Feature CN3702; CONSONANCE 5A, Standalone Li-ion Battery Charger CN3702 General Descriptions: The CN3702 is a PWM .
Manufacture CONSONANCE
Datasheet
Download CN3702 Datasheet




CONSONANCE CN3702
CONSONANCE
5A, Standalone Li-ion Battery Charger
CN3702
General Descriptions:
The CN3702 is a PWM switch-mode lithium ion
battery charger controller for 2 cell li-ion battery in
a small package using few external components.
The CN3702 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 8.4V 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
2.8V/cell. 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 4V/cell. CN3702 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.
CN3702 is available in a space-saving 16-pin
TSSOP package.
Applications:
Portable DVD, Walkie-Talkie
Notebook Computers
Battery-Backup Systems
Portable Industrial and
Medical Equipment
Standalone Battery Chargers
Features:
Wide Input Voltage: 7.5V to 28V
Complete Charger Controller for 2 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
CN3702
16 DRV
15 VCC
14 BAT
13 CSP
12 NC
11 COM3
10 test
9 COM2
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Rev.1.2



CONSONANCE CN3702
CONSONANCE
Typical Application Circuit:
Input Power Supply
C1
C5
100nF
M1
D1
R1
D3
R2
NTC
1
VG
15 VCC
R5
16
DRV
CSP 13
BAT 14
D4 CN3702 NC 12
4 CHRG
5 DONE
6 TEMP
7 EOC
test 10
COM2 9
COM1 8
COM3 11
R3 GND PGND
32
C2
100nF
L
D2
RCS
C3
470pF
R4
120
C4
220nF
C6
BAT
Figure 1 Typical Application Circuit
Ordering Information:
Part No.
CN3702
Operating Ambient Temperature
40to 85
Constant Charging Voltage
8.4V(2 Li-ion Batteries)
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Rev.1.2



CONSONANCE CN3702
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 120
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, CHRG, DONE to GND………………..…0.3V to 30V
Voltage from VG, DRV to VCC…………………………….…8V
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)………………..……260
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.
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3
Rev.1.2







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