Datasheet

UNISONIC TECHNOLOGIES CO., LTD
UB10803
Preliminary
CMOS IC
ONE-CELL STANDALONE
LINEAR LITHIUM BATTERY
CHARGER

HSOP-8
DESCRIPTION
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.

DFN-8(2x3)
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
* 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
UB10803G-SH2-R
UB10803G- K08-2030-R
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
Package
HSOP-8
DFN-8(2×3)
Packing
Tape Reel
Tape Reel
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Preliminary
CMOS IC
MARKING
HSOP-8

PIN CONFIGURATION

PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
7
8
PIN NAME
VIN
PPR
CHG
EN
GND
IMIN
IREF
BAT
DFN-8(2×3)
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
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
Preliminary
CMOS IC
BLOCK DIAGRAM
VIN
1:1:4000
POR
0.5uA
3.9V
MA
MA
BAT
Sleep
CA
VIN
BAT
VA
VREF
Enable
VREF
EN
200k
Rechg
0.76V
1.0V
PPR
0.2V
EOC
IMIN
LOGIC
115°C
OTP
CHG
T DI
E
BAT
Trickle
2.75V
GND
IREF
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IMIN
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Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
UNIT
Input Supply Voltage
VIN
-0.3 ~ +7.0
V
IREF Voltage
VIREF
-0.3 ~ +7.0
V
IMIN Voltage
VIMIN
-0.3 ~ +7.0
V
BAT Voltage
VBAT
-0.3 ~ +7.0
V
EN Voltage
VEN
-0.3 ~ +7.0
V
CHG Voltage
VCHG
-0.3 ~ +7.0
V
PPR Voltage
VPPR
-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
PARAMETER
Junction to Ambient
Junction to Case

RATINGS
59
4.5
UNIT
°C/W
C/W
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Operating Voltage
Programmable Current
Operating Temperature

SYMBOL
θJA
θJC
SYMBOL
VIN
ICHG
TA
MIN
4.5
50
-40
TYP
MAX
6.0
500
85
UNIT
V
mA
C
ELECTRICAL CHARACTERISTICS (VCC=5V, TA=25°С unless otherwise specified)
PARAMETER
VIN-BAT Offset Voltage Rising Edge
VIN-BAT Offset Voltage Falling Edge
Rising Power On Reset Threshold
Falling Power On Reset Threshold
DC Supply Current
SYMBOL
VOS
VPOR
IDC
BAT Pin Sink Current
ISTBY
Output Voltage
VCH
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
VDS(on)
ICHG
IPRE
IMIN
IRECH
VPRE
VPREHYS
TFOLD
VENH
VENL
REN
ICHGOL
ICHGOH
IPPROL
IPPROH
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TEST CONDITIONS
VBAT=4.0V
VBAT=4.0V
VBAT=3.0V
VBAT=3.0V
Charge enabled
Charge disabled
Charge disabled or the input
is floating
4.5V<VIN<6.5V,
Charge Current=20mA
VBAT=3.8V,
Charge Current=0.5A
RIREF=29.4kΩ,VBAT=2.8~4.0V
RIREF=29.4kΩ,VBAT=2.4V
RIMIN=29.4kΩ
RIMIN=29.4kΩ
MIN
10
3.4
3.1
TYP
90
50
3.9
3.6
500
300
MAX
150
4.3
4.1
1000
500
1
4.15
4.20
135
27
27
100
2.75
100
115
4.25
100
5
200
V
μA
V
Ω
150
37
37
130
2.85
160
1.3
VCHG=1.0V
VCHG=6.5V
VPPR=1.0V
VPPR=6.5V
mV
μA
0.6
120
17
17
70
2.65
40
UNIT
0.5
300
1
5
1
mA
mA
mA
mA
V
mV
C
V
kΩ
mA
μA
mA
μA
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Preliminary
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OPERATION
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 ICHG is programmable by setting an external resistor
RIREF 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 (IMIN) can be easily programmed with an external resistor RIMIN. 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 ICHG 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). VIN > VPOR
(2). VIN - VBAT > VOS
Where the VOS is the offset voltage, it determines if the battery voltage is even higher than the input voltage. All
VPOR and VOS 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 (VOS). 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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OPERATION(Cont.)
6. IMIN Indication
The IMIN pin can be used to program the End-of-Charge (EOC) current by connecting a resistor between this pin
and the GND pin. The programming is defined by the following equation:
800
IMIN (mA) =
RIMIN
Where RIMIN is usually in kΩ.
7. IREF Pin
The IREF pin is for fast charge-current programming. By connecting a resistor between this pin and the GND pin,
the fast charge current limit is determined by the following equation:
ICHG (mA) =
4000
RIREF
Where RIREF is in kΩ. The actual charge current is guaranteed to have 10% accuracy of ICHG with the charge
current set at 150mA.
8. BAT pin
Always connect the BAT pin to a single-cell Li-ion/Polymer battery in parallel with a 1μF (or larger) X5R ceramic
capacitor for decoupling and guaranteeing system stability. When the EN pin is pulled to logic HIGH, the BAT output
is disabled. The UTC UB10803 relies on a battery for stability and is not guaranteed to be stable if the battery is not
connected.
9. Dropout Voltage
When the input voltage is low while the battery voltage is high, the charging current may not be maintained
according to the equation ICHG (mA) = 4000/RIREF due to a limited internal on-resistance (RDS(ON)) of the internal pass
element. The worst resistance of the pass FET is about 1.2Ω at the maximum operating temperature, thus if tested
with 500mA current and 4.2V battery voltage, constant current could still be maintained when the input voltage is as
low as 4.62V.
10. Thermal Foldback
The bottom big exposed pads in both HSOP-8 and DFN-8(2x3) packages are used for thermal foldback. For
reducing the chip ambient temperature as much as possible, it is recommended to connect as much copper as
possible to this pad either on the component layer or other layers through thermal vias. The thermal regulation
function starts to reduce the charge current when the internal temperature reaches a typical value of 115°C.
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Preliminary
CMOS IC
APPLICATION INFORMATION
Input Capacitor Selection
The input capacitor is employed to decouple the power supply from load transients and suppress noise from
power lines. Typically, a 1μF X5R ceramic capacitor is recommended to be placed very close between the VIN pin
and GND pin to stabilize the operation during the start up, especially when the input supply is passing the POR
threshold and the VIN-BAT comparator offset voltage. Once passing through the POR threshold, there is a voltage
hysteresis to provide sufficient guard band from noise or load transient to trigger the system to reset.
Output Capacitor Selection
The criterion for selecting the output capacitor is to maintain the stability of the charger as well as to bypass any
transient load current. Typically, a minimum capacitance of 1μF X5R ceramic capacitor is recommended and
sufficient for stabilizing the system. For systems that may happen to occasionally see high load transients, the output
capacitor may be increased to further bypass any ripples so caused.
Charge Current Limit
During the constant-current (CC) charging mode, the charging current is primarily determined by ICHG as
calculated in previous formula. However, the actual charge current in the CC mode could also be limited by other
factors. When the input (VIN) and output (VBAT) voltages are too close to each other, the on-resistance of the internal
pass element may limit the amount of current that passes through it.
When the input voltage is sufficiently higher than the battery voltage, yet has not increased the die temperature
over the thermal limit.
When the input voltage is reduced (or the battery voltage increases towards the input voltage), the charge current
is limited by the on-resistance of the pass element. Therefore, it is recommended to employ sufficiently high input
voltage for applications that require constant charging current over the entire charging period. But for applications
that needs to minimize the heat dissipation, a current-limiting adapter maybe applied to maintain constant charging
current at whole charging phase.
In addition, if the input voltage increases, the charge current may also be reduced due to the thermal fold back
function. The high voltage drop across the pass element increases the power dissipation therein and thus causing
the die temperature to increase significantly.
Layout Guidance
The UTC UB10803 employs thermally-enhanced DFN package, which has an exposed thermal pad at its bottom
side. It is recommended to connect as much copper as possible between the exposed pad and PCB to make it
effective in taking the heat away from the die. For applications requiring high charging current, the thermal
impedance should be further reduced by employing more layers of copper to connect with the exposed pad through
thermal via.
Input Power Sources
The UTC UB10803 works with different types of AC/DC adapter or USB port (any type) with no special
requirements. The UTC UB10803 accepts input voltage ranges from 4.5V to 6.5V for normal operation.
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Preliminary
CMOS IC
TYPICAL CHARGE PROFILE
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Preliminary
CMOS IC
TYPICAL APPLICATION CIRCUIT
Fig1. Typical Application Circuit for LED Display
Component Description for Figure 1
Description
1μF X5R ceramic cap
1μF X5R ceramic cap
29.4kΩ, 1% for 135mA charge current
29.4kΩ, 1% for 27mA EOC current
300Ω, 5%
LEDs for indication
Part
C1
C2
RIREF
RMIN
R1, R2
D1, D2
Fig2. Typical Application Circuit Interfacing to a MCU
Part
C1
C2
RIREF
RMIN
R1, R2
Component Description for Figure 2
Description
1μF X5R ceramic cap
1μF X5R ceramic cap
29.4kΩ, 1% for 135mA charge current
29.4kΩ, 1% for 27mA EOC current
100kΩ, 5%
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Preliminary
CMOS IC
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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