CONSONANCE
Lithium Ion Battery Charger for Solar-Powered Systems
CN3063
General Description:
The CN3063 is a complete constant-current /constant
voltage linear charger for single cell Li-ion and Li
Polymer rechargeable batteries. The device contains
an on-chip power MOSFET and eliminates the need
for the external sense resistor and blocking diode. An
on-chip 8-bit ADC can adjust charging current
automatically based on the output capability of input
power supply, so CN3063 is ideally suited for solar
powered system. Furthermore, the CN3063 is
specifically designed to work within USB power
specifications. Thermal feedback regulates the
charge current to limit the die temperature during
high power operation or high ambient temperature.
The regulation voltage is internally fixed at 4.2V
with 1% accuracy, it can also be adjusted with an
external resistor. The charge current can be
programmed externally with a single resistor. When
the input supply is removed, the CN3063
automatically enters a low power sleep mode ,
dropping the battery drain current to less than 3uA.
Other features include undervoltage lockout,
automatic recharge, battery temperature sensing and
charging/termination indicator.
The CN3063 is available in a thermally enhanced
8-pin SOP package.
Features:
On-chip 8-bit ADC can adjust charging current
automatically based on the output capability of
input power supply
Suitable for Solar-Powered System
On-chip Power MOSFET
No external Blocking Diode or Current Sense
Resistors Required
Preset 4.2V Regulation Voltage with 1%
Accuracy, adjustable with an external resistor
Precharge Conditioning for Reviving Deeply
Discharged Cells and Minimizing Heat
Dissipation During Initial Stage of Charge
Continuous Programmable Charge Current Up
to 600mA
Constant-Current/Constant-Voltage Operation
with Thermal Regulation to Maximize Charge
Rate Without Risk of Overheating
Automatic Low-Power Sleep Mode When Input
Supply Voltage is Removed
Status Indication for LEDs or uP Interface
C/10 Charge Termination
Automatic Recharge
Battery Temperature Sensing
Available in SOP8 Package
Pb-free Available
Applications:
Solar Powered System
Digital Still Cameras
MP3 Players
Bluetooth Applications
Portable Devices
Chargers
Pin Assignment
TEMP
1
ISET
2
GND
3
VIN
4
8
7
6
5
FB
CHRG
DONE
BAT
CN3063
www.consonance-elec.com
REV 1.1
1
CONSONANCE
Typical Application Circuit
Input Power Supply
4.4V to 6V
4
VIN
22uF
FB
BAT
8
5
4.7uF
330
Bat+
Bat-
CN3063
Green
LED
Red
LED
R1
CHRG
DONE
GND
3
TEMP
ISET
1
2
NTC
7
6
Battery
R
ISET
Figure 1 Typical Application Circuit
(Constant Voltage Level 4.2V)
Input Power Supply 4.4V to 6V
4
VIN
22uF
FB
BAT
8
5
Rx
330
4.7uF
Bat+
CN3063
Green
LED
Red
LED
TEMP
CHRG
DONE
GND
3
ISET
1
Bat-
Battery
7
6
2
R
ISET
Figure 2 Application Circuit
(Adjust Constant Voltage Level with Rx)
www.consonance-elec.com
REV 1.1
2
In Figure 2, the BAT pin’s voltage in constant voltage mode is given by the following equation:
Vbat
＝
4.2＋3.04×10
-6
×Rx
Where，Vbat is in volt
Rx is in ohm
Block Diagram
VIN
T
die
115 C
ISET
+
Tamp
-
+
Iamp
-
FB
Vamp
+
-
BAT
VIN
8-bit ADC
Iref
Decoder
and
Switch Matrix
Vref
Termination
Comparator
Recharge
Comparator
DONE
TEMP
TEMP
Comparator
control
CHRG
UVLO
GND
Figure 3 Block Diagram
REV 1.1
3
Pin Description
Pin No.
Name
Function Description
Temperature Sense Input.
Connecting TEMP pin to NTC thermistor’s
output in Lithium ion battery pack. If TEMP pin’s voltage is below 46% of
1
TEMP
input supply voltage V
IN
for more than 0.15S, this means that battery’s
temperature is too high or too low, charging is suspended. If TEMP’s voltage
level is above 46% of input supply voltage for more than 0.15S, battery fault
state is released, and charging will resume.
The temperature sense function can be disabled by grounding the TEMP pin.
Constant Charge Current Setting and Charge Current Monitor Pin.
The
charge current is set by connecting a resistor R
ISET
from this pin to GND.
When in precharge mode, the ISET pin’s voltage is regulated to 0.2V. When in
constant charge current mode, the ISET pin’s voltage is regulated to 2V. In all
modes during charging, the voltage on ISET pin can be used to measure the
charge current as follows:
I
CH
= (V
ISET
／R
ISET
)×900
3
4
GND
VIN
Ground Terminal.
Positive Input Supply Voltage.
V
IN
is the power supply to the internal circuit.
When V
IN
drops to within 40mv of the BAT pin voltage, CN3063 enters low
power sleep mode, dropping BAT pin’s current to less than 3uA.
Battery Connection Pin.
Connect the positive terminal of the battery to BAT
pin. BAT pin draws less than 3uA current in chip disable mode or in sleep
mode. BAT pin provides charge current to the battery and provides regulation
voltage of 4.2V.
Open-Drain Charge termination Status Output.
In charge termination
6
status,
is pulled low by an internal switch; Otherwise
high impedance state.
pin is pulled low by an internal switch, otherwise
impedance state.
FB
pin is in
2
ISET
5
BAT
Open Drain Charge Status Output.
When the battery is being charged, the
7
pin is in high
8
Battery Voltage Kevin Sense Input.
This Pin can Kelvin sense the battery
voltage; Also the regulation voltage in constant voltage mode can be adjusted
by connecting an external resistor between FB pin and BAT pin.
Absolute Maximum Ratings
All Terminal Voltage……………－0.3V to 6.5V
BAT Short-Circuit Duration………...Continuous
Storage Temperature….............－65℃ to 150℃
Lead Temperature(Soldering)…….............300℃
Maximum Junction Temperature…...150℃
Operating Temperature…...－40℃ to 85℃
Thermal Resistance (SOP8)………….TBD
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.
REV 1.1
4
Electrical Characteristics
(VIN=5V, T
A
=－40℃ to 85℃, Typical Values are measured at T
A
=25℃,unless otherwise noted)
Parameters
Input Supply Voltage
Operating Current
Undervoltage Lockout
Undervoltage Lockout
Hysteresis
Regulation Voltage
Symbol
VIN
I
VIN
Vuvlo
Huvlo
V
REG
Constant Voltage Mode
R
ISET
=3.6K, V
BAT
＝3.6V
BAT pin Current
I
BAT
R
ISET
=3.6K, V
BAT
＝2.4V
V
BAT
=V
REG
, standby mode
VIN=0V, sleep mode
Voltage at BAT pin rising
4.158
400
25
1.75
Charge Termination Mode
VIN falling
Test Conditions
Min
4.4
400
650
3.7
0.1
4.2
500
50
3.5
4.242
600
75
7
3
2.9
3.0
0.1
3.1
Typ
Max
6
950
3.9
Unit
V
uA
V
V
V
mA
uA
Precharge Threshold
Precharge Threshold
Precharge Threshold
Hysteresis
Charge Termination
Threshold
Recharge Threshold
Recharge Threshold
Sleep Mode
Sleep Mode Threshold
Sleep mode Release
Threshold
ISET Pin
ISET Pin Voltage
TEMP PIN
Input Threshold
TEMP input Current
Pin
Sink Current
Leakage Current
Pin
Sink Current
Leakage Current
I
CHRG
V
CHRG
=0.3V, Charge status
V
CHRG
=6V, termination mode
10
1
mA
uA
I
DONE
V
DONE
=0.3V, termination mode
V
DONE
=6V, charge mode
10
1
mA
uA
V
TEMP
TEMP to V
IN
or to GND
43.5
46
48.5
0.5
%V
IN
uA
V
ISET
Precharge mode
Constant current mode
0.2
2.0
V
V
SLP
V
SLPR
V
IN
from high to low, measures
the voltage (V
IN
－V
BAT
)
V
IN
from low to high, measures
the voltage (V
IN
－V
BAT
)
40
90
mv
mv
V
RECH
V
REG
－0.1
V
V
PRE
H
PRE
V
V
Charge Termination Threshold
Vterm
Measure voltage at ISET pin
0.18
0.22
0.26
V
REV 1.1
5
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