Charger IC. CN3791 Datasheet

CN3791 IC. Datasheet pdf. Equivalent


CONSONANCE CN3791
CONSONANCE
4A, Standalone Li-ion Battery Charger IC
With Photovoltaic Cell MPPT Function
CN3791
General Descriptions:
The CN3791 is a PWM switch-mode lithium ion
battery charger controller that can be powered by
photovoltaic cell with maximum power point
tracking function with few external components.
The CN3791 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. The constant charge current is
programmable with a single current sense resistor.
Deeply discharged batteries are automatically
trickle charged at 17.5% of the full-scale current
until the cell voltage exceeds 66.5% of constant
voltage. The charge cycle is terminated once the
charge 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. CN3791 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.
CN3791 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:
Photovoltaic Cell Maximum Power Point
Tracking
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
Constant Voltage: 4.2V±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
CN3791
10 DRV
9 VCC
8 CSP
7 BAT
6 MPPT
www.consonance-elec.com
1
Rev.1.0


CN3791 Datasheet
Recommendation CN3791 Datasheet
Part CN3791
Description Standalone Li-ion Battery Charger IC
Feature CN3791; CONSONANCE 4A, Standalone Li-ion Battery Charger IC With Photovoltaic Cell MPPT Function CN3791 Ge.
Manufacture CONSONANCE
Datasheet
Download CN3791 Datasheet




CONSONANCE CN3791
CONSONANCE
Typical Application Circuit:
Input Supply
C1
C2
100nF
M1
D1
*
R3
D3
R4
R1
D4
1
VG
9 VCC
10
DRV
CSP 8
BAT 7
CN3791
3 CHRG
COM 5
4 DONE
6 MPPT
GND
2
L
D2
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.
CN3791
Shipment
Tape and Reel, 3000/Reel
Operating Ambient Temperature
40to 85
www.consonance-elec.com
2
Rev.1.0



CONSONANCE CN3791
CONSONANCE
Pin Description:
Pin No.
1
2
3
4
5
6
7
8
9
10
Name
VG
GND
COM
MPPT
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.
Photovoltaic Cell Maximum Power Point Tracking Pin. Connect this pin to
the external resistor divider for maximum power point tracking. In maximum
power point tracking status, the MPPT pin’s voltage is regulated to 1.205V.
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, MPPT 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.
www.consonance-elec.com
3
Rev.1.0







@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)