Battery Charger. CN3761 Datasheet

CN3761 Charger. Datasheet pdf. Equivalent


CONSONANCE CN3761
CONSONANCE
4A, Standalone Li-ion Battery Charger
CN3761
General Descriptions:
The CN3761 is a PWM switch-mode lithium ion
battery charger controller for 1 cell li-ion battery in
a small package using few external components.
The CN3761 is specially designed for charging
lithium ion batteries with constant current and
constant voltage mode. In constant voltage mode,
the regulation voltage can be fixed at 4.2V with ±
1% accuracy, also can be adjusted upward with an
external resistor. The constant charging current is
programmable with a single current sense resistor.
Deeply discharged batteries are automatically
trickle charged at 17.5% of the programmed
constant charging current until the cell voltage
exceeds 66.5% of constant voltage. The charge
cycle is terminated once the charging current drops
to 16% of full-scale current, and a new charge
cycle automatically restarts if the battery voltage
falls below 95.5% of regulation voltage. CN3761
will automatically enter sleep mode when input
voltage is lower than battery voltage.
Other features include under voltage lockout,
battery over voltage protection, status indication,
etc.
CN3761 is available in a space-saving 10-pin
SSOP package.
Applications:
Power Bank
Hand-held Equipment
Battery-Backup Systems
Portable Industrial and Medical Equipment
Standalone Battery Chargers
Features:
Wide Input Voltage: 4.5V to 28V
Complete Charge Controller for single
cell Lithium-ion Battery
Charge Current Up to 4A
High PWM Switching Frequency:
300KHz
Regulation Voltage can be adjusted
upward
Constant Voltage Accuracy: ±1%
Charging Current is programmed with a
current sense resistor
Automatic Conditioning of Deeply
Discharged Batteries
Automatic Recharge
Charging Status Indication
Soft Start
Battery Overvoltage Protection
Operating Ambient Temperature
40to 85
Available in 10 Pin SSOP Package
Pb-free,Rohs-Compliant,Halogen Free
Pin Assignment:
VG 1
GND 2
CHRG 3
DONE 4
COM 5
CN3761
10 DRV
9 VCC
8 CSP
7 BAT
6 FB
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CN3761 Datasheet
Recommendation CN3761 Datasheet
Part CN3761
Description Standalone Li-ion Battery Charger
Feature CN3761; CONSONANCE 4A, Standalone Li-ion Battery Charger CN3761 General Descriptions: The CN3761 is a PWM s.
Manufacture CONSONANCE
Datasheet
Download CN3761 Datasheet




CONSONANCE CN3761
CONSONANCE
Typical Application Circuit:
Input Supply
C1
C2
100nF
M1
D1
*
1 10
VG
9 VCC
DRV
R1
D3 D4
CSP 8
BAT 7
CN3761
FB
6
3 CHRG
COM 5
4 DONE
GND
2
L
D2
Rx
R2
120
C4
220nF
RCS
C3
BAT
*: D1 can be omitted, refer to section Diode Selectionon Page 9
Figure 1 Typical Application Circuit
Ordering Information:
Part No.
CN3761
Shipment
Tape and Reel, 3000/Reel
Operating Ambient Temperature
40to 85
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CONSONANCE CN3761
CONSONANCE
Pin Description:
Pin No.
1
2
3
4
5
6
7
8
9
10
Name
VG
GND
COM
FB
BAT
CSP
VCC
DRV
Descriptions
Internal Voltage Regulator. VG internally supplies power to gate driver,
connect a 100nF capacitor between VG pin and VCC pin.
Ground. Negative terminal of input supply.
Open-Drain Charge Status 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 Charge Termination Output. When the charging is terminated,
this pin is pulled low by an internal switch. Otherwise this pin is in high
impedance state.
Loop Compensation Input. Connect a 220nF capacitor in series with an 120
resistor from this pin to GND. The charging can be disabled by pulling the
voltage of COM pin below 0.18V.
Battery Voltage Kevin Sense Input. This Pin can Kelvin sense the battery
voltage; Also the regulation voltage in constant voltage mode can be adjusted
upward by connecting a resistor between FB pin and BAT pin.
Negative Input for Charge Current Sensing. This pin and the CSP pin measure
the voltage drop across the sense resistor RCS to provide the current signals
required.
Positive Input for Charge Current Sensing. This pin and the BAT pin measure
the voltage drop across the sense resistor RCS to provide the current signals
required.
External DC Power Supply Input. VCC is also the power supply for internal
circuit. Bypass this pin with capacitors.
Gate Drive Pin. 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 VG to VCC………………………………………8V to VCC0.3V
Voltage from CSP, BAT, COM, FB to GND………..…………0.3V to 6.5V
Storage Temperature………………………………………...…65to 150
Operating Ambient Temperature………………………….……40to 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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