BL1084 5A Bipolar Linear Regulator DESCRIPTION FEATURES BL1084 is a series of low dropout three terminal regulators with a typical dropout voltage of 1.4V at 5A load current. Fixed and adjustable versions. Maximum output current : 5A Maximum input voltage: 15V Line regulation: 0.2％ (Typical) Load regulation: 0.2％ (Typical) On-Chip Thermal Shutdown Operation environment Temperature: -40℃ ~ 85℃ Other than fixed voltage versions (1.8V, 2.5V, 3.3V, 5.0V), BL1084 has an adjustable voltage version, with which desired voltage can be achieved by setting the values of two external resistors of the application circuitry. BL1084 offers thermal shut down and current limit functions to assure the stability of chip and power system. APPLICATIONS BL1084 series is available in standard packages of TO-263-2L, TO-263-3L, TO-220 and TO-252. TYPICAL APPLICATION Power Management for Computer Mother Board, Graphic Card Battery Charger Post Regulators for Switching Supplies Microprocessor Supply ELECTRICAL CHARACTERISTICS 1.5 1.4 Dropout(V) BL1084 1.3 1.2 1.1 1 0.9 0.8 0.5 1.5 2.5 3.5 4.5 Iout(A) Fig 1. BL1084 fixed version Application circuit Fig 2. Dropout Voltage VS. Output Current NOTE: Input capacitor (Cin=10uF) and Output capacitor (Cout=22uF) are recommended in all application circuit. Tantalum capacitor is preferred. www.belling.com.cn 1 BL1084 ORDERING INFORMATION BL1084 □ 1 □ 2 □ 3 Code 1 □ 2 □ 3 □ PIN CONFIGURATION Description Output voltage: e.g. 18=1.8V 33=3.3V Default=Adjustable Version 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 Operating Junction Temperature(Tj) Ambient Temperature(Ta) Package TO-252 Thermal TO-263 Resistance TO-220 Storage Temperature(Ts) Lead Temperature & Time 15V 150C Pin Description： Fixed Version -40C –85C 6℃ / W 3℃ / W Pin No. 1 2 3 3℃ / W -40C -150C 260C,10S Definition Ground Output Input Adjustable Version Pin No. 1 2 3 Note: Exceed these limits to damage to the device. Exposure to absolute maximum rating conditions may affect device reliability. RECOMMENDED WORK CONDITIONS Parameter Value Input Voltage Range Operating Junction Temperature(Tj) Symbol GND Vout Vin Symbol Definition Adj. Adjustable Vout Output Vin Input Marking information： Max.15V -20C -125C A：Means Manufacture weeks B：Means Manufacture LOT No. C:Means Output Voltage Value D:Means Temp. Range&Rohs Std www.belling.com.cn 2 BL1084 ELECTRICAL CHARACTERISTICS Tj=25℃ Symbol Vref Vout ΔVout ΔVout Parameter Reference Voltage Conditions Min Typ Max Unit 10mA≤Iout≤5A ,1.5V≤Vin-Vout≤5V 1.225 1.25 1.275 V BL1084-1.80V Iout=0mA,Vin=4.8V,Tj=25℃ 10mA≤Iout≤5A ,3.4V≤Vin≤7V 1.773 1.764 1.80 1.80 1.827 1.836 V BL1084-2.50V Iout=0mA,Vin=5.5V,Tj=25℃ 10mA≤Iout≤5A ,4.1V≤Vin≤7V 2.462 2.45 2.50 2.50 2.537 2.55 V BL1084-3.3V Iout=0mA,Vin=6.3V,Tj=25℃ 10mA ≤Iout≤5A ,4.9V≤Vin≤8V 3.25 3.234 3.3 3.3 3.350 3.366 V BL1084-5.0V Iout=0mA,Vin=8.0V,Tj=25℃ 10mA ≤Iout≤5A ,6.6V≤Vin≤10V 4.925 4.90 5.0 5.0 5.075 5.10 V BL1084-ADJ Iout=10mA, 2.85V≤Vin≤10V 10 40 mV BL1084-1.8V Iout=10mA, 3.4V≤Vin≤10V 10 40 mV BL1084-2.5V Iout=10mA, 4.1V≤Vin≤10V 10 40 mV BL1084-3.3V Iout=10mA, 4.9V≤Vin≤10V 10 40 mV BL1084-5.0V Iout=10mA, 6.6V≤Vin≤10V 10 40 mV BL1084-ADJ (ADJ connected to ground) Vin-Vout=1.6V, 10mA≤Iout≤5A 16 50 mV BL1084-1.8V Vin-Vout=1.6V, 0≤Iout≤5A 16 50 mV BL1084-2.5V Vin-Vout=1.6V, 0≤Iout≤5A 16 50 mV BL1084-3.3V Vin-Vout=1.6V, 0≤Iout≤5A 16 50 mV BL1084-5.0V Vin-Vout=1.6V, 0≤Iout≤5A 16 50 mV Output Voltage Line Regulation (note 1) Load Regulation (note 1,2) www.belling.com.cn 3 BL1084 Vin-Vout Ilimit Iq IAdj Dropout Voltage (note 3) ΔVout, ΔVref =1%，Iout=5A Current Limit Vin-Vout=3V, Tj=25℃ 7 BL1084-ADJ 3 10 mA Vin=10V 5 10 mA 2.85V ≤Vin≤4.25V, 10mA≤ Iout≤5A 45 120 uA Minimum Load Current (note 4) Quiescent Current Adjust Pin Current (Adjustable Version) Ripple Rejection Ichange 1.4 F=120Hz,Cout=25uF( tan), Iout=5A,Vin-Vout=3V Adjust Pin Current Change Temperature Stability JC Thermal Resistance junction to case OTP Over Temperature Protection 60 10mA≤Iout≤5A 1.5V≤Vin-Vout ≤6V V A 65 0.4 Iout=10mA, Vin-Vout=1.5V TO-252 TO-263 TO-220 1.6 dB 10 µA 0.5 % 12.5 3 3 ℃/W 150 ℃ Note1: Line Regulation and Load Regulation in Table1 are tested under constant junction temperature. Note2: When load current varies between 0~5A 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=5A 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 4 BL1084 BLOCK DIAGRAM Fig 3. Block Diagram DETAILED DESCRIPTION BL1084 is a series of low dropout voltage three terminal regulators. 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 circuitry 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 BL1084 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 (CAdj) between the adjust terminal and ground can 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 R1 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 5 BL1084 BL1084 BL1084 Fig 4. Typical Application of BL1084 EXPLANATION The output voltage of adjustable version satisfies this followed equation: Vout=VRef× (1+R2/R1)+IAdj×R2. The second term IAdj×R2 can be ignored since the adjustable pin current IAdj (~ 50µA) is much less than the current through R1 (~ 4mA). The value of R1 is preferred in the range of 120Ω～200Ω and the total output current of the adjustable version of BL1084 needs to exceed 10mA to assure normal chip operation. www.belling.com.cn 6 BL1084 TYPICAL PERFORMANCE CHARACTERISTICS Output Voltage VS. Temperature 1.5 1.8 1.4 1.795 1.3 1.79 Vout(V) Dropout(V) Dropout Voltage VS. Output Current 1.2 1.1 1.785 1 1.78 0.9 1.775 0.8 0.5 1.5 2.5 3.5 1.77 4.5 0 Iout(A) 10 20 30 40 50 60 70 80 T( C) Output Voltage VS. Output Current 1.9 1.8 1.7 Vout(V) 1.6 1.5 1.4 1.3 1.2 1.1 1 0 1 2 3 4 5 Iout(A) Load Transient Response Line Transient Response 3A Vin 0.1A Vout Vout CH1 1.5A Vin=4.25V CH2 100mV Vout=1.25V www.belling.com.cn 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) M 100us Iout=100mA to 3A Cin=Cout=10uF(tan) 7 BL1084 PACKAGE LINE Package TO-252 Devices per reel Package specification： Taping dimension： www.belling.com.cn 8 2500 Unit mm BL1084 Taping reel dimension： www.belling.com.cn 9 BL1084 Package TO-263-2L Devices per reel Package specification： Taping dimension： www.belling.com.cn 10 800 Unit mm BL1084 Taping reel dimension： www.belling.com.cn 11 BL1084 Package TO-263-3L Devices per reel Package specification： Taping dimension： www.belling.com.cn 12 800 Unit mm BL1084 Taping reel dimension： www.belling.com.cn 13