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UB2012 Schematic ( PDF Datasheet ) - Unisonic Technologies

Teilenummer UB2012
Beschreibung ADVANCED LINEAR CHARGE MANAGEMENT IC
Hersteller Unisonic Technologies
Logo Unisonic Technologies Logo 




Gesamt 17 Seiten
UB2012 Datasheet, Funktion
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
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Free Datasheet http://www.Datasheet4U.com






UB2012 Datasheet, Funktion
UB2012
Preliminary
LINEAR INTEGRATED CIRCUIT
„ TYPICAL APPLICATION CIRCUIT
DC+
GND
RSNS
0.2
C2
10μF
Q1
2SB1151
R1
1k
VCC
CC COMP
SNS UB2012 BAT
VCC
TS
VSS
STAT
D1
R2
2k
VCC
RT1
RT2
PACK+
C1
0.1μF
PACK-
TEMP
NTC
Battery
Pack
Figure 1. Low Dropout Single-or Two-Cell Li-Lon/Li-Pol Charger
FUNCTIONAL DESCRIPTION
The UTC UB2012 is designed for the applications of single or two-cell Li-Ion or Li-Pol batteries. Figure 1 is the
schematic of using this advanced linear charge controller with a PNP pass transistor. Figure 2 is the operation
flowchart of UB2012. Figure 3 shows the typical charge profile. Figure 4 is the application schematic of a charger
using P-channel MOSFET..
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
6 of 17
QW-R121-018 .b
Free Datasheet http://www.Datasheet4U.com

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UB2012 pdf, datenblatt
UB2012
Preliminary
LINEAR INTEGRATED CIRCUIT
„ APPLICATION INFORMATION(Cont.)
CHARGE INHIBIT FUNCTION
The TS pin can be used as charge-inhibit input. The user can inhibit charge by connecting the TS pin to VCC or
VSS (or any level outside the V(TS1) to V(TS2) thresholds). Applying a voltage between the V(TS1) and V(TS2) thresholds
to pin TS returns the charger to normal operation.
CHARGE STATUS INDICATION
The UTC UB2012 reports the status of the charger on the 3-state STAT pin. The following table summarized the
operation of the STAT pin.
CONDITION
STAT PIN
Battery conditioning and charging
High
Charge complete (Done)
Low
Temperature fault or sleep mode
Hi-Z
The STAT pin can be used to drive a single LED (Figure 1), dual-chip LEDs (Figure 4) or for interface to a host
or system processor (Figure 11). When interfacing the UTC UB2012 to a processor, the user can use an output port,
as shown in Figure 11, to recognize the high-Z state of the STAT pin. In this configuration, the user needs to read
the input pin, toggle the output port and read the STAT pin again. In a high-Z condition, the input port always
matches the signal level on the output port.
UTC
UB2012
SNS
COMP
BAT CC
VCC
VSS
TS STAT
Host
Processor
OUT
IN
Figure 9 Interfacing the UTC 2012 to a Host Processor
LOW-POWER SLEEP MODE
The UTC UB2012 enters the sleep mode if the VCC falls below the voltage at the BAT input. This feature
prevents draining the battery pack during the absence of VCC.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
12 of 17
QW-R121-018 .b
Free Datasheet http://www.Datasheet4U.com

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