UNISONIC TECHNOLOGIES CO., LTD
UB10803
Preliminary
CMOS IC
ONE-CELL STANDALONE
LINEAR LITHIUM BATTERY
CHARGER
DESCRIPTION
SOP-8
The UTC
UB10803
is a fully-integrated single-cell Li-ion/Polymer
battery charger. The device operates without external FET and
blocking diode, and employs a constant-current constant-voltage
(CC/CV) charging profile.
The fast-charge and end-of-charge (EOC) currents are
programmable with independent external resistors. When the battery
is deeply discharged to lower than 2.75V, the charger firstly
pre-charges the battery with typically 20% of the programmable
fast-charge current. When the charge current is reduced to the
programmed EOC current level (almost works completely in a
constant-voltage (CV) mode), an EOC indication is displayed through
the CHG pins. The UTC
UB10803
is protected by thermal regulation
technology to prevent the IC from over-heat during charging.
Two status indication pins (PPR and CHG), which are both
implemented as an open-drain outputs, can be used to drive LEDs or
work as logic interface to a microprocessor. When no adapter is
attached or when the charger is disabled, the leakage current from
battery cell is less than 1uA typically.
FEATURES
* A Constant-Current/Constant-Voltage Linear Charger
for Single-Cell Li-ion/Polymer Batteries
* Integrated Pass Element and Current Sensor
* Highly-Integrated, Requiring No External FETs or
Blocking Diode
* 4.2V Voltage Accuracy: ±1.2% All Temperatures
(Available with 4.10V and 4.36V options upon request)
* Programmable Charge Current 50mA to 500mA
* Programmable End-Of-Charge Current by Current
Recharge Algorithm
1
DFN-8(2x3)
* Pre-Charge for Fully Discharged Batteries
* 1μA (Typ.) Leakage Current of the Battery when No
Input Power is Attached or Charger is Disabled
* Power Present and Charge Status Indications
* Thermal Regulation on Charging Current to Prevent
Over-Heat
* Few Components, Cost-Effective Solutions
ORDERING INFORMATION
Ordering Number
Lead Free
UB10803L-SH2-T
UB10803L-SH2-R
UB10803L- K08-2030-R
Halogen Free
UB10803G-SH2-T
UB10803G-SH2-R
UB10803G- K08-2030-R
Package
HSOP-8
HSOP-8
DFN-8(2×3)
Packing
Tube
Tape Reel
Tape Reel
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Copyright © 2013 Unisonic Technologies Co., Ltd
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UB10803
PIN CONFIGURATION
Preliminary
CMOS IC
PIN DESCRIPTION
PIN NAME
V
IN
PPR
CHG
EN
GND
I
MIN
I
REF
BAT
DESCRIPTION
Supply Input
Power Present Active-Low Open Drain Power Status Indicator
Charge Active-Low Open Drain Charge Status Indicator
Enable Active-Low Input
Ground
End-Of-Charge Current Setting Input
Charge Current Setting Input for Adaptor Mode
Battery Terminal
PIN NO.
1
2
3
4
5
6
7
8
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UB10803
BLOCK DIAGRAM
Preliminary
CMOS IC
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ABSOLUTE MAXIMUM RATINGS
Preliminary
CMOS IC
PARAMETER
SYMBOL
RATINGS
UNIT
Input Supply Voltage
V
IN
-0.3 ~ +7.0
V
I
REF
Voltage
V
IREF
-0.3 ~ +7.0
V
I
MIN
Voltage
V
IMIN
-0.3 ~ +7.0
V
BAT Voltage
V
BAT
-0.3 ~ +7.0
V
EN Voltage
V
EN
-0.3 ~ +7.0
V
CHG Voltage
V
CHG
-0.3 ~ +7.0
V
PPR Voltage
V
PPR
-0.3 ~ +7.0
V
Notes: 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
2. Pulse (μsec) noise exceeding the above input voltage (GND+7.0V) may cause damage to the IC.
THERMAL DATA
SYMBOL
θ
JA
θ
JC
RATINGS
59
4.5
UNIT
°C/W
C/W
PARAMETER
Junction to Ambient
Junction to Case
RECOMMENDED OPERATING CONDITIONS
SYMBOL
V
IN
I
CHG
T
A
MIN
4.5
50
-40
TYP
MAX
6.0
500
85
UNIT
V
mA
C
PARAMETER
Operating Voltage
Programmable Current
Operating Temperature
ELECTRICAL CHARACTERISTICS
(V
CC
=5V, T
A
=25°С unless otherwise specified)
SYMBOL
V
OS
V
POR
I
DC
I
STBY
V
CH
V
DS(on)
I
CHG
I
PRE
I
MIN
I
RECH
V
PRE
V
PREHYS
T
FOLD
V
ENH
V
ENL
R
EN
I
CHGOL
I
CHGOH
I
PPROL
I
PPROH
TEST CONDITIONS
V
BAT
=4.0V
V
BAT
=4.0V
V
BAT
=3.0V
V
BAT
=3.0V
Charge enabled
Charge disabled
Charge disabled or the input
is floating
4.5V<V
IN
<6.5V,
Charge Current=20mA
V
BAT
=3.8V,
Charge Current=0.5A
R
IREF
=29.4kΩ,V
BAT
=2.8~4.0V
R
IREF
=29.4kΩ,V
BAT
=2.4V
R
IMIN
=29.4kΩ
R
IMIN
=29.4kΩ
MIN
10
3.4
3.1
TYP
90
50
3.9
3.6
500
300
1
4.15
4.20
0.6
120
17
17
70
2.65
40
1.3
100
5
5
1
200
0.5
300
1
135
27
27
100
2.75
100
115
150
37
37
130
2.85
160
4.25
MAX
150
4.3
4.1
1000
500
UNIT
mV
V
μA
μA
V
Ω
mA
mA
mA
mA
V
mV
C
V
kΩ
mA
μA
mA
μA
PARAMETER
V
IN
-BAT Offset Voltage Rising Edge
V
IN
-BAT Offset Voltage Falling Edge
Rising Power On Reset Threshold
Falling Power On Reset Threshold
DC Supply Current
BAT Pin Sink Current
Output Voltage
Power FET “ON” Resistance
Constant Charge Current for Adaptor Mode
Precharge Charge Current
End of Charge Current
EOC Rising Threshold
Precharge Threshold Voltage
Precharge Voltage Hysteresis
Thermal Regulation Threshold
EN Pin Logic Input High
EN Pin Logic Input Low
EN Pin Internal pull Down Resistance
CHG Pin Sink Current When Low
CHG Pin Leakage Current When High
PPR Pin Sink Current When Low
PPR Pin Leakage Current When High
V
CHG
=1.0V
V
CHG
=6.5V
V
PPR
=1.0V
V
PPR
=6.5V
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UB10803
OPERATION
Preliminary
CMOS IC
The UTC
UB10803
charges a single-cell Li-ion/Polymer battery with a programmed constant current (CC) or a
constant voltage (CV) profile. The constant fast charge current I
CHG
is programmable by setting an external resistor
R
IREF
while the constant voltage is factory-trimmed at 4.2V (4.10V or 4.36V options are available upon request). If the
battery voltage is deeply discharged to lower than 2.75V, The UTC
UB10803
pre-charges the battery with a 20%
programmable current until the battery voltage rises above the pre-charge threshold. After pre-charge finishes,
constant-current (CC) charging mode begins with the pre-set fast charge current. Normally, the battery voltage rises
gradually during CC charge phase. When the battery voltage reaches nearly 4.2V, the charger enters the
constant-voltage (CV) charging mode and begins to regulate the battery voltage at 4.2V while diminishing the
charging current gradually. When the charging current is reduced to an amount smaller than the programmed
End-Of-Charge (EOC) current level, the charger gives out a “full-charge” indication through the CHG pin, but the
charger still continues to regulate the battery voltage at 4.2V with safe & small current.
The end-of-charge (EOC) current level (I
MIN
) can be easily programmed with an external resistor R
IMIN
. The CHG
signal turns to LOW when pre-charge starts and rises to HIGH when EOC is reached. After reaching EOC, the
charge current has to rise again to typically 76% of I
CHG
before the CHG signal will turn on again. The current surge
after EOC can be caused by a load connected to the battery.
When the die temperature reaches
115°C
(typically), a thermal regulation function is employed to reduce the
charge current accordingly to maintain the temperature from increasing furthermore. This is an important function to
achieve safe operation even when the printed circuit board (PCB) is not effective in leaking out the heat generated
by the linear charger.
1. PPR Indication
The PPR pin is implemented as an open-drain output to provide a power-good indication of the input power source
such as an AC adapter. When the input voltage is higher than the POR (Power-On Reset) threshold, the PPR pin
turns on the internal open-drain MOSFET to indicate logic LOW signal. The PPR indication is designed to be
independent on the chip enable (EN-pin) input. When the internal open-drain FET is turned off, the PPR pin should
leak less than 1μA current. When turned on, the PPR pin should be able to sink at least 5mA current under all
operating conditions. The PPR pin can be used to drive an LED or worked as logic interface to a microprocessor.
2. Power-Good Range
The input voltage is considered as power good when it meets the following three conditions:
(1). V
IN
> V
POR
(2). V
IN
- V
BAT
> V
OS
Where the V
OS
is the offset voltage, it determines if the battery voltage is even higher than the input voltage. All
V
POR
and V
OS
are realized with sufficient hysteresis, as given in the Electrical Specification table. All charging
activities are disabled when the input voltage falls out of the power-good range.
3. Input and Output Comparator
Obviously, when the input source voltage is lower than the battery voltage, no charging activity could be started
and the charger will disable the internal pass element to prevent battery leakage. Charge begins when the input
voltage is higher than the battery voltage by a defined offset voltage (V
OS
). This scheme also ensures that the
charger is completely turned off when the input power is removed from the charger.
4. CHG Indication
The CHG pin is implemented as an open-drain output to give a logic LOW when a charge cycle begins and turn
HIGH when an end-of-charge (EOC) condition is reached. This pin is designed with a sinking ability of more than
5mA so as to drive an LED. When the charger is disabled through EN-pin, the CHG output is high impedance. The
CHG pin can also be used to interface with a microprocessor.
5. EN Input
The chip is enabled by a logic LOW signal applied to the EN pin. This pin is realized with a 200kΩ internal
pull-down resistor such that even the EN pin is left floating, the input is equivalent to logic LOW and the chip is
enabled by default. Similarly, the chip is disabled when the EN pin receives a logic HIGH signal.
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