BL1085_12 BELLING | Alldatasheet
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www.belling.com.cn 1 3A Bipolar Linear Regulator BL1085
DESCRIPTION
BL1085 is a series of low dropout three terminal regulators with a typical dropout voltage of 1.4V at 3A load current. Other than fixed voltage versions (1.8V, 2.5V, 3.3V, 5.0V), BL1085 has an adjustable voltage version, with which d esired voltage can be achieved by setting the values of two external resistors of the application circuitry. BL1085 offers thermal shut down and current limit functions to assure the stability of chip and power system. BL1085 series is available in standard packages of TO-263-2L, TO-263-3L, TO-220 and TO-252.
FEATURES
Fixed and adjustable versions. Maximum output current : 3A Maximum input voltage: 15V Line regulation: 0.2％ (Typical) Load regulation: 0.2％ (Typical) On-Chip Thermal Shutdown Operation environment Temperature: -10℃ ~ 85℃
APPLICATIONS
Power Management for Computer Mother Board, Graphic Card Battery Charger Post Regulators for Switching Supplies Microprocessor Supply TYPICAL APPLICATION
ELECTRICAL CHARACTERISTICS
Fig 1. BL1085 fixed version Application circuit NOTE: Input capacitor (Cin=10uF) and Output capacitor (Cout=22uF) are recommended in all application circuit. Tantalum capacitor is preferred. Fig 2. Dropout Voltage VS. Output Current BL1085 0.8 0.9 1.1 1.2 1.3 1.4 1.5 Iout(A) Dropout(V)
www.belling.com.cn 2 BL1085
ORDERING INFORMATION
BL1085 □1 □2 □3 Code Description Output voltage: e.g. 18=1.8V 33=3.3V Default=Adjustable Version □2 Temperature&Rohs: C: -40~85C ,Pb Free Rohs Std. Package type: Y:TO-252 S:TO-263-2L S1:TO-263-3L Z:TO-220-3L ABSOLUTE MAXIMUM RATING Parameter Value Max Input Voltage 15V Operating Junction Temperature(Tj) 150C Ambient Temperature(Ta) -40C –85C Package Thermal Resistance TO-252 6℃ / W TO-263 3℃ / W TO-220 3℃ / W Storage Temperature(Ts) -40C -150C Lead Temperature & Time 260C,10S PIN CONFIGURATION Pin Description： Fixed Version Pin No. Symbol Definition
1 GND Ground
2 Vout Output
3 Vin Input
Note: Exceed these limits to damage to the de vice. Exposure to absolute maximum rating conditions may affect device reliability. RECOMMENDED WORK CONDITIONS Parameter Value Input Voltage Range Max.15V Operating Junction Temperature(Tj) -10C –125C Pin No. Symbol Definition 1 Adj. Adjustable Marking information： A：Means assembly year and weeks Year 2010 2011 2012 2013 … Y 0 1 2 3 … Week 1 2 … 26 27 … 52 53 W A B … Z A B：Means Manufacture LOT No. C：Means Output Voltage Value D：Means Temp. Range&Rohs Std
www.belling.com.cn 3 BL1085 Tj=25℃ Symbol Parameter Conditions Min Typ Max Unit Vref Reference Voltage 10mA≤Iout≤3A ,1.5V≤Vin-Vout≤5V 1.225 1.25 1.275 V Vout Output Voltage BL1085-1.80V Iout=0mA,Vin=4.8V,Tj=25℃ 10mA≤Iout≤3A ,3.4V≤Vin≤7V 1.773 1.764 1.80 1.80 1.827 1.836 V BL1085-2.50V Iout=0mA,Vin=5.5V,Tj=25℃ 10mA≤Iout≤3A ,4.1V≤Vin≤7V 2.462 2.45 2.50 2.50 2.537 2.55 V BL1085-3.3V Iout=0mA,Vin=6.3V,Tj=25℃ 10mA ≤Iout≤3A ,4.9V≤Vin≤8V 3.25 3.234 3.3 3.3 3.350 3.366 V BL1085-5.0V Iout=0mA,Vin=8.0V,Tj=25℃ 10mA ≤Iout≤3A ,6.6V≤Vin≤10V 4.925 4.90 5.0 5.0 5.075 5.10 V ΔVout Line Regulation (note 1) BL1085-ADJ Iout=10mA, 2.85V≤Vin≤10V 10 40 mV BL1085-1.8V Iout=10mA, 3.4V≤Vin≤10V 10 40 mV BL1085-2.5V Iout=10mA, 4.1V≤Vin≤10V 10 40 mV BL1085-3.3V Iout=10mA, 4.9V≤Vin≤10V 10 40 mV BL1085-5.0V Iout=10mA, 6.6V≤Vin≤10V 10 40 mV ΔVout Load Regulation (note 1,2) BL1085-ADJ (ADJ connected to ground) Vin-Vout=1.6V, 10mA≤Iout≤3A 16 50 mV BL1085-1.8V Vin-Vout=1.6V, 0≤Iout≤3A 16 50 mV BL1085-2.5V Vin-Vout=1.6V, 0≤Iout≤3A 16 50 mV BL1085-3.3V Vin-Vout=1.6V, 0≤Iout≤3A 16 50 mV BL1085-5.0V Vin-Vout=1.6V, 0≤Iout≤3A 16 50 mV
www.belling.com.cn 4 BL1085 Vin-Vout Dropout Voltage (note 3) ΔVout, ΔVref =1%，Iout=3A 1.4 V Ilimit Current Limit Vin-Vout=3V, Tj=25℃ 7 A Minimum Load Current (note 4) BL1085-ADJ 3 10 mA Iq Quiescent Current Vin=10V 5 10 mA IAdj Adjust Pin Current (Adjustable Version) 2.85V ≤Vin≤4.25V, 10mA≤ Iout≤3A 45 120 uA Ripple Rejection F=120Hz,Cout=25uF( tan), Iout=3A,Vin-Vout=3V 60 dB Ichange Adjust Pin Current Change 10mA≤Iout≤3A 1.5V≤Vin-Vout ≤6V 0.4 10 µA Temperature Stability Iout=10mA, Vin-Vout=1.5V 0.5 % JC Thermal Resistance junction to case TO-252 TO-263 TO-220 12.5 ℃ / W OTP Over Temperature Protection 150 ℃ Note1: Line Regulation and Load Regulation in Table1 are tested under constant junction temperature. Note2: When load current varies between 0~ 3A and Vin-Vout ranges from 1.5V~6V at constant junction temperature, the parameter is satisfied the criterion in table. If temperature varies between -40℃≤TA≤85℃， it needs output current to be larger than 10mA to satisfy the criterion. Note3: Dropout Voltage is the voltage difference between the input and output pin when the input voltage is minimum to maintain the lowest spec output voltage. Dropout Voltage is the voltage difference between the input and output pin under Iout=3A and the following test condition: 1) Find out output voltage value ( denoted as Vout1) when Vin1=Vout+1.5V 2) Decrease input voltage until output voltage is equal to 98.5% of Vout1, and denote the Vin and Vout as Vin2 and Vout2. 3) Vdropout=Vin2-Vout2. Note4: Minimum Load Current is defined as the minimum output current necessary to maintain regulation. Specified output accuracy can be met when the output current exceeds the minimum load current (10mA) and the dropout voltage (Vin-Vout) lies between 1.5V and 6V.
www.belling.com.cn 5 BL1085 BLOCK DIAGRAM Fig 3. Block Diagram DETAILED DESCRIPTION BL1085 is a series of low dropout voltage three terminal re gulators. Its circuit has a trimmed bandgap reference to ensure output voltage accuracy independent of temperature variance. On-chip thermal shutdown provides protection against overload and conditions as elevated ambient temperature. Its application c ircuitry requires minimum number of external components. Both fixed voltage and adjustable voltage versions need input and output capacitors to assure output voltage stability. Any desired output voltage from 1.25V to 10V can be achieved with adjustable version by assigning proper values to two external resistors in its application circuitry (as shown in Fig.4, as R1, R2 are the two external resistors.). TYPICAL APPLICATION BL1085 has an adjustable version and fixed versions, Fig.4 shows their typical application circuitry. A 10uF tan capacitor connected between input and GND as bypass capacitor and a 22uF tan capacitor between output and GND are recommended for all application. Using a bypass capacitor (C Adj) between the adjust terminal and ground ca n improve ripple rejection. The bypass capacitor prevents ripple from being amplified in case the output voltage is increased. The impedance of CAdj should be less than the resistance of R 1 to prevent ripple from being amplified at any frequency. As R1 is normally in the range of 120Ω~200Ω, the value of CAdj should satisfy the following condition: 1/(2* FrequencyRipple *Cadj)<R1 A 10µF tan capacitor is recommended.
www.belling.com.cn 6 BL1085 Fig 4. Typical Application of BL1085 EXPLANATION The output voltage of adjustable version satisfies this followed equation: Vout=VRef× (1+R2/R1)+IAdj×R2. The second term I Adj×R2 can be ignored since the adjustable pin current IAdj (~ 50µA) is much less than the current through R1 (~ 4mA). The value of R 1 is preferr ed in the range of 120Ω～200Ω and the total output current of the adjustable version of BL1085 needs to exceed 10mA to assure normal chip operation. BL1085 BL1085
www.belling.com.cn 7 BL1085 TYPICAL PERFORMANCE CHARACTERISTICS Dropout Voltage VS. Output Current Output Voltage VS. Temperature CH1 1.5A CH2 100mV M 100us Vin=4.25V Vout=1.25V Iout=100mA to 3A Cin=Cout=10uF(tan) 0.1A Vout CH1 1.0V CH2 20.0mV M 250us Vin=3.25V to 5.25V Vout=1.25V Iout=200mA Cin=1uF (tan) Cout=10uF(tan) Vin Vout Load Transient Response Line Transient Response Output Voltage VS. Output Current 1.77 1.775 1.78 1.785 1.79 1.795 1.8 0 10 20 30 40 50 60 70 80 T( C) Vout(V) 0.8 0.9 1.1 1.2 1.3 1.4 1.5 Iout(A) Dropout(V) 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 0 1 2 3 4 5 Iout(A) Vout(V)
www.belling.com.cn 8 BL1085 PACKAGE LINE Package TO-252 Devices per reel 2500 Unit mm Package specification： Taping dimension：
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www.belling.com.cn 10 BL1085 Package TO-263-2L Devices per reel 800 Unit mm Package specification： Taping dimension：
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www.belling.com.cn 12 BL1085 Package TO-263-3L Devices per reel 800 Unit mm Package specification： Taping dimension：
www.belling.com.cn 13 BL1085 Taping reel dimension：