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PDF UB2012 Data sheet ( Hoja de datos )
| Número de pieza | UB2012 | |
| Descripción | ADVANCED LINEAR CHARGE MANAGEMENT IC | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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UNISONIC TECHNOLOGIES CO., LTD
UB2012
Preliminary
LINEAR INTEGRATED CIRCUIT
ADVANCED LINEAR CHARGE
MANAGEMENT IC FOR SINGLE
AND TWO-CELL LITHIUM-ION AND
LITHIUM-POLYMER
DESCRIPTION
UTC UB2012 is designed for portable electronics with lower cost. Its
advantages of high-accuracy voltage/current regulation, charging status
indication, temperature monitoring, and automatic charge-rate compensation.
In applications, the battery temperature is continuously under monitor
by using an external thermistor, if the temperature is over user-defined
threshold; UTC UB2012 inhibits charge for safety concern.
Generally, the UB2012 charges the battery in conditioning, constant voltage and constant current phases. If the
battery voltage is lower than the low-voltage threshold (VMIN), a low current is used for conditioning the battery. The
conditioning charge rate is around 10% of the regulation current and the heat dissipation in the external pass
element during the initial stage of the charge is minimized by the conditioning current. After the conditioning phase,
the UB2012 applies a constant current that be set by an external sense-resistor to the battery. The sense-resistor
can be on the battery without additional components. The constant current phase continues until the battery reaches
the charge-regulation voltage, then the constant voltage phase is beginning.
UTC UB2012 offers 4.1V, 4.2V, 8.4V and 8.4V fixed-voltage for single and dual cells. Charge stops when the
current tapers to the charge termination threshold (ITERM) and will recharge if the battery voltage falls below the VRCH.
The automatic charge-rate compensation feature reduces the charging time of batteries. For the internal
impedance of battery pack during charge, this advanced technique offers safe and dynamic compensation.
FEATURES
* Ideal for Single 4.1V,4.2 V and Dual-Cell 8.2,8.4 V Li-Ion or Li-Pol Packs
* 0.3V Dropout Voltage for Minimizing Heat Dissipation
* Better than ±1% Accuracy of Voltage Regulation With Preset Voltages
* Dynamic Compensation of Battery Pack’s Internal Impedance to short Charging Time
* Optional Cell-Temperature Monitoring
* Integrated Voltage and Current Regulation With Programmable Charge-Current
* Integrated Cell Conditioning for Reviving Deeply Discharged Cells and Minimizing Heat Dissipation During Initial
Charge Stage
* Charge Status Output for Single or Dual Led or Host Processor Interface
* Automatic Battery-Recharge Feature
* Charge Termination by Minimum Current
* Automatic Low-Power Sleep Mode When VCC is Removed
* EVMs Available for Quick Evaluation
ORDERING INFORMATION
Ordering Number
Package
UB2012xG-S08-R
SOP-8
Note: x: Output Voltage, refer to Marking Information.
Packing
Tape Reel
www.unisonic.com.tw
Copyright © 2010 Unisonic Technologies Co., Ltd
1 of 17
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1 page  
UB2012
Preliminary
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS
TEMPERATURE COMPARATOR
Temperature
Threshold
Lower
Upper
V(TS1)
V(TS2)
PRECHARGE COMPARATOR
TS Pin Voltage
Precharge Threshold
V(MIN)
UB2012A
UB2012B
UB2012C
UB2012D
PRECHARGE CURRENT REGULATION
Voltage at pin SNS, 0°C≤Ta≤50°C
Precharge Current Regulation I(PRECHG) Voltage at pin SNS,
0°C≤Ta≤50°C, VCC = 5 V
VRCH COMPARATOR (BATTERY RECHARGE THRESHOLD)
UB2012A
Recharge Threshold
V(RCH)
UB2012B
UB2012C
UB2012D
CHARGE-RATE COMPENSATION (Automatic Charge-Rate Compensation)
29.1 30 30.9 %VCC
58.3 60 61.8 %VCC
2.94 3.0 3.06 V
3.04 3.1 3.16 V
5.98 6.1 6.22 V
6.18 6.3 6.42 V
13 mV
3 13 22 mV
VO(REG) VO(REG- VO(REG)
-80mV -100mV -120mV
VO(REG) VO(REG) VO(REG)
-160mV -200mV -240mV
V
V
Automatic Charge-Rate
Compensation Gain
G(COMP) V(BAT)+0.3V≤VCC≤VCC(MAX),
1.7 2.2 2.7 V/V
STAT PIN
Output (Low) Voltage
VOL(STAT) IOL=10mA
Output (High) Voltage
VOH(STAT) IOH=5mA
CC PIN
Output Low Voltage
Sink Current
VOL(CC) IO(CC)=5mA (sink)
IO(CC) Not to exceed power rating (PD)
Notes: V(BAT) +0.3 V≤VCC≤VCC(MAX)
VCC-0.5
5
0.7 V
V
1.5 V
40 mA
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 17
QW-R121-018 .b
Free Datasheet http://www.Datasheet4U.com
5 Page 
UB2012
Preliminary
LINEAR INTEGRATED CIRCUIT
APPLICATION INFORMATION(Cont.)
BATTERY TEMPERATURE MONITORING
The UTC UB2012 continuously monitors temperature by measuring the voltage between the TS and VSS pins.
A negative- or a positive-temperature coefficient thermistor (NTC, PTC) and an external voltage divider typically
develop this voltage. (See Figure 9.) The UTC UB2012 compares this voltage against its internal V(TS1) and V(TS2)
thresholds to determine if charging is allowed. (See Figure 10.) The temperature sensing circuit is immune to any
fluctuation in VCC, since both the external voltage divider and the internal thresholds (V(TS1) and V(TS2) ) are
referenced to VCC.
The resistor values of R(T1) and R(T2) are calculated by the following equations:
For NTC Thermistors:
RT1
=
5 × RTH × RTC
3 × (RTC - RTH )
RT2
=
5 × RTH
[(2 ×RTC ) -
× RTC
(7 ×RTH )]
(3)
(4)
For PTC Thermistors:
RT1
=
5 × RTH × RTC
3 × (RTH - RTC )
RT2
=
5 × RTH × RTC
[(2 ×RTH ) - (7 ×RTC )]
(5)
(6)
Where R(TC) is the cold temperature resistance and R(TH) is the hot temperature resistance of thermistor, as
specified by the thermistor manufacturer.
RT1 or RT2 can be omitted If only one temperature (hot or cold) setting is required. Applying a voltage between
the V(TS1) and V(TS2) thresholds to pin TS disables the temperature-sensing feature.
DC+
RSNS
BAT+
RT1
DC-
UTC
UB2012
SNS COMP
BAT
VCC
TS
CC
VSS
STAT
RT2
BAT-
Thermistor
Figure 7. Temperature Sensing Circuits
Figure 8. UTC UB2012 TS Input Thresholds
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
11 of 17
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11 Page | ||
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| PDF Descargar | [ Datasheet UB2012.PDF ] | |
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