Battery Charger Controller SOT23-5 SC70-5 Package Preliminar

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Battery Charger Controller SOT23-5 SC70-5 Package Preliminar

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AQ120
Battery Charger Controller
SOT23-5 SC70-5 Package
Preliminary Specification Revision April 2006
General Description
AQ120 cost linear battery charger controller with similar features industry standard "1734" style controller, with extra ability charge multiple cell Lithium batteries well NiCad types. addition, maximum volts. AQ120 flexibility allows setting charge voltage current with minimum number external components. open collector output capable driving external transistor. temperature stable bandgap reference (1.25 controls maximum output voltage, while current control circuit sets constant charging current.
Applications Battery chargers Features 1.25V reference with accuracy Multiple cell compatible Programmable charge current current consumption Offered ultra small SC70-5 package blocking diode required Wide range: 2.5V 25mA drive current sink battery drain shutdown Sleep mode with input supply removal RoHS compliant available Configuration
Block Diagram
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AQ120
Acutechnology Semiconductor Inc.
AQ120
Typical Application
Note: values R1and charge voltage three Li-Ion cells possible). value sets charge current.
Descriptions
Name DRIVE IPROG VREF Function Output error amplifier. sink capability Ground Current programming pin, threshold Positive supply Voltage programming pin; threshold 1.25V.
Ordering Information
Device AQ120 AQ120 AQ120 AQ120
Note:
Operating -20C° 105C° -20C° 105C° -20C° 105C° -20C° 105C°
%Tol
Type SOT-23-5 SOT-23-5 SC70-5 SC70-5
VOUT 1.25V 1.25V 1.25V 1.25V
Wrap
Order Number AQ120DY-M5-AJ-TR AQ120DY-M5-AJ-TRL AQ120DY-C5-AJ-TR AQ120DY-C5-AJ-TRL
parts Lead Free RoHS compliant.
www.acutechnology.com
Rev.
April 2006
Acutechnology Semiconductor Inc.
AQ120
Absolute Maximum Ratings
Parameter Voltage DRIVE Voltage Voltage VCC, DRIVE, Current Operating Junction Temperature Lead Temperature (soldering seconds) Storage Temperature Range Value +150 Units
Electrical Specifications
Electrical characteristics guaranteed over full temperature range <Tj< Ambient temperature must de-rated based upon power dissipation package thermal characteristics. Unless otherwise stated, test conditions VDRIVE 4.3V, VIPROG Symbol VREF LnREG VDRVlow DRIVE LEAK VIPROG Gain IIPROG Parameter Supply Voltage Range Quiescent Supply Current Reference Voltage Reference Temperature Deviation Reference variation with Supply Voltage Reference input current Output Saturation Voltage Drive Current Output Leakage Current IPROG threshold voltage Delta Vref VIPROG PROG input current VREF= VCC= VDRIVE= VCC=2.5V IDRIVE VREF IDRIVE VREF DRIVE VREF VIPROG VDRIVE VREF VIPROG VIPROG -250 1.238 Conditions 1.250 -160 1.263 Units mV/V
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Rev.
April 2006
Acutechnology Semiconductor Inc.
AQ120
Typical Performance Characteristics
Charge urrent battery oltage Lithium battery 200mV /div Cons tant oltage mode
Cons tant urrent mode
Fig.1 Charge current battery voltage
Constant current
Constant voltage
Fig. Battery charge time
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Rev.
April 2006
Acutechnology Semiconductor Inc.
AQ120
Operation
AQ120 linear battery charger controller. Charging begins when rises above 2.5V. When charging, collector external transistor provides charge current. Below target charge voltage controller current mode. When battery voltage reaches target voltage then controller switches voltage mode. target voltage programmable through external resistor divider. This allows flexibility voltage more cells batteries, NiMH NiCd batteries). current mode AQ120 regulates voltage across sense resistor charge current therefore given 0.2V Rsense. additional resistor recommended typical application diagram) stability reasons, then threshold actually increased value resistor multiplied current IPROG pin. AQ120 designed maximum current excess external transistor must have adequate beta, saturation voltage sufficient power dissipation capability. With supply voltages, saturation voltage becomes important well. constant voltage mode, controller will control battery voltage exceed target charge voltage. When applied, charger manually shut down opening resistor resistor divider (floating otherwise grounded pulling high pin. This used conjunction with external thermostat switch. When input power removed manual shutdown entered, charger will drain only very small leakage currents from battery, thus maximizing battery standby time. leakage current reverse-biased base-emitter junction external transistor. indicator added show when charger operational, simply connecting base-emitter additional transistor parallel base-emitter collector LED. AQ120 contains control loops. maintain good stability constant voltage mode, capacitor least 10uF series ohms resistor usually required from collector external ground. stability system also depending type external transistor. High beta PNPs reducing phase margin some cases. insure system stability current mode without affecting voltage mode. resistor affects threshold. example R6=150 ohms threshold moves from Furthermore external PMOS place represents valid alternative application when wanting minimize current consumption during charge.
www.acutechnology.com
Rev.
April 2006
Acutechnology Semiconductor Inc.
AQ120
Package Dimensions SOT23-3, SOT23-4, SOT23-5, SOT23-6
www.acutechnology.com
Rev.
April 2006
Acutechnology Semiconductor Inc.
AQ120
SC70-3, SC70-4, SC70-5, SC70-6
Contact Information
Acutechnology Semiconductor Inc. 3487 McKee Suite Jose 95127
Disclaimer
information furnished Acutechnology this data sheet believed accurate reliable. However, Acutechnology assumes responsibility use. Acutechnology reserves right change circuitry specifications time without notification customer.
TEL: FAX: website:
(408) 259-2300 (408) 259-9160 www.acutechnology.com
Life Support Policy
Acutechnology Products designed authorized components life support devices systems where malfunction product reasonably expected result personal injury. Life support devices systems devices systems that intended surgical implant into body support sustain life, whose failure perform reasonably expected result significant injury user.
www.acutechnology.com
Rev.
April 2006

Battery Charger Controller SOT23-5 SC70-5 Package Preliminar

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