 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| BOOKLY MICRO LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR Data Sheet 431L General Description The BM431L series ICs are low voltage three-terminal adjustable regulators with guaranteed thermal stability over a full operation range. These ICs feature sharp turn-on characteristics, low temperature coefficient and low output impedance, which make them ideal substitutes for Zener diodes in applications such as switching power supply, charger, motherboard and other adjustable regulators. The output voltage can be set to any value between 1.24V and 18V with two external resistors. The BM431L precision reference is offered in two bandgap tolerance: 0.5% and 1%. The 4 main packages have low thermal impedance which allows operation over a wide range of -40oC to 125oC. Features * * * * * * * * Wide programmable precise output voltage from 1.24V to 18V High stability under capacitive load Low temperature deviation: 3mV typical Low equivalent full-range temperature coefficient: 20PPM/oC typical Low dynamic output resistance: 0.05 typical High sink current capacity from 55A to 100 mA Low output noise Available in 4 packages: TO-92, SOT-23-3, SOT23-5, SOT-89 Applications * * * * * Graphic Card PC Motherboard Voltage Adapter Switching Power Supply Charger SOT-23-5 SOT-23-3 TO-92 SOT-89 Figure 1. Package Types of BM431L August 2003 1 Rev. 1.1 BOOKLY MICRO LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR Data Sheet 431L Pin Configuration Z Package (TO-92) N Package (SOT-23-3) ANODE K Package (SOT-23-5) R Package (SOT-89) 3 CATHODE 2 ANODE 1 REF REF 1 3 2 NC NC CATHODE CATHODE 1 2 3 5 ANODE 1 2 3 4 REF REF ANODE CATHODE Figure 2. Pin Configuration of BM431L Functional Block Diagram CATHODE REF + VREF ANODE Figure 3. Functional Block Diagram of BM431L August 2003 2 Rev. 1.1 BOOKLY MICRO LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR Data Sheet 431L Ordering Information Package Temperature Range Voltage Tolerance 0.5% 1% 0.5% 1% 0.5% 1% 0.5% 1% Part Number BM431LAZ BM431LBZ BM431LAN BM431LBN BM431LAK BM431LBK BM431LAR BM431LBR Marking ID BM431LAZ BM431LBZ 432N N47 K41 K42 R41A R41B Packing Type Bulk Ammo Reel Reel Reel TO-92 SOT-23-3 -40oC ~ 125oC SOT-23-5 SOT - 89 B M 431L X Y Circuit Type Bandgap Tolerance A: 0.5% B: 1% Package Z: TO-92 N: SOT-23-3 K: SOT-23-5 R: SOT-89 Absolute Maximum Ratings (Note 1) Parameter Cathode Voltage Cathode Current Range (Continuous) Reference Input Current Range Power Dissipation Storage Temperature Range Symbol VKA IKA IREF PD TSTG Value 20 -100 ~ +100 10 Z,R Package N,K Package -65~+150 TO-92 Package Thermal Impedance QJA SOT-23-3 SOT-23-5 SOT-89 130 330 250 100 o Unit V mA mA 770 370 mW oC C/W Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only , and functional operation of the device at these or any other conditions beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability. August 2003 3 Rev. 1.1 BOOKLY MICRO LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR Data Sheet 431L Recommended Operating Conditions Parameter Cathode Voltage Cathode Current Operating Ambient Temperature Range Symbol VKA IKA Min VREF 0.1 -40 Max 18 100 125 Unit V mA o C Electrical Characteristics (Typical and limits apply for TJ=25oC unless otherwise noted.) Parameter Reference Voltage 0.5% 1% Test Symbol Circuit 4 4 5 5 Conditions Min 1.234 1.228 Typ 1.240 1.240 2 3 -0.5 0.15 Max 1.246 1.252 10 10 -1.5 0.4 mV/V A Unit V mV VREF VKA=VREF, IKA=10mA VREF VKA=VREF IKA=10mA 0oC ~ 70oC -40oC~ 85oC Deviation of Reference Voltage Over-Temperature Ratio of Change in VREF to the Change in Cathode Voltage Reference Input Current Deviation of Reference Current Over Full Temperature Range Minimum Cathode Current for Regulation Off-State Cathode Current Dynamic Impedance VREF I =10mA, Vz: V KA REF to 16V VKA IREF IREF IKA=10mA, R1=10K, R2= IKA=10mA, R1=10K, R2= TA=-40 to 85oC 5 4 6 0.1 55 0.04 0.01 0.05 0.4 80 0.10 0.05 0.15 A A IKA V =V (MIN) KA REF IKA VREF=0, VKA=18V (OFF) VKA=6, VREF=0 VKA=VREF, IKA=1 to 100mA ZKA f1.0kHz A 4 August 2003 4 Rev. 1.1 BOOKLY MICRO LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR Data Sheet 431L R1 V IN IKA V KA V REF Figure 4. Test Circuit 4 for VKA=VREF R3 VIN IKA R1 IREF VKA=VREF(1+R1/R2)+ IREF . R1 R2 VREF VKA Figure 5. Test Circuit 5 for VKA>VREF VIN IOFF VKA Figure 6. Test Circuit 6 for IOFF August 2003 5 Rev. 1.1 BOOKLY MICRO LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR Data Sheet 431L Typical Performance Characteristics 1.242 1.241 1.240 1.239 1.238 1.237 1.236 1.235 -50 VKA=VREF IKA=10mA 0.18 R2= IKA=10mA R1=10K Reference Voltage (V) Reference Current (A) 0.17 0.16 0.15 0.14 0.13 -25 0 25 50 75 o 100 125 150 0.12 -50 -25 0 25 50 o 75 100 125 Ambient Temperature ( C) Ambient Temperature ( C) Figure 7. Reference Voltage vs. Ambient Temperature Figure 8. Reference Current vs. Ambient Temperature 150 400 VKA=VREF 100 TA=25 C 200 o 300 VKA=VREF TA=25 C o Cathode Current (mA) 50 Cathode Current (A) 100 0 -100 -200 -300 0 -50 -100 -150 -1 0 1 -1 0 1 Cathode Voltage (V) Cathode Voltage (V) Figure 9. Cathode Current vs. Cathode Voltage Figure 10. Current vs. Cathode Voltage August 2003 6 Rev. 1.1 BOOKLY MICRO LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR Data Sheet 431L Typical Performance Characteristics (Continued) Output 60 6.8K IKA=10mA TA=25 C o I KA 360 50 Voltage Gain (dB) 10uF 40 30 20 4.3K 5V GND 10 0 100 1k 10k 100k 500K Small Signal Frequency (HZ) Figure 11. Small Signal Voltage Gain vs. Frequency 10 Output Impedance () 1 100 IKA = 1mA to 100mA IKA 50 0.1 0.01 1k 10k 100k 1M GND Frequency (Hz) Figure 12. Dynamic Impedance vs. Frequency August 2003 7 Rev. 1.1 BOOKLY MICRO LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR Data Sheet 431L Typical Performance Characteristics (Continued) 3 Input and output voltage (V) Iutput 2 Output R1 1.8K 1 Output Pulse Generator f=100KHz R2 50 0 -1 0 1 2 3 4 5 6 GND Time (S) Figure 13. Pulse Response of Input and Output Voltage -0.30 -0.35 IKA=10mA VKA=VREF to 16V. Ratio of VREF to VKA (mV/V) -0.40 -0.45 -0.50 -0.55 -40 -20 0 20 40 60 o 80 100 120 Ambient Temperature ( C) Figure 14. Ratio of Delta Reference Voltage to the Ratio of Cathode Voltage vs. Ambient Temperature August 2003 8 Rev. 1.1 BOOKLY MICRO LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR Data Sheet 431L Typical Applications R3 VIN R1 V OUT VO=(1+R1/R2) VREF V REF R2 BM431L Figure 15. Shunt Regulator VIN R1 R2 VREF R4 VOUT VO=(1+R2/R3) VREF 2 BM431L R3 Figure 16. High Current Shunt Regulator R2 VIN Iout R1 IOUT = VREF/R2 + IKA BM431L Figure17. Current Source or Current Limit August 2003 9 Rev. 1.1 BOOKLY MICRO LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR Data Sheet 431L Typical Applications (Continued) VIN R1 8.2K BM1117 2.5V/1A R2 250 BM431L R3 250 Figure18. Precision 5-V 1.5A Regulator C1 R2 680 R5 R1 3 COMP R3 R4 VOUT U2 C2 Q1 2 BM431L R6 PWM Controller VFB 4 PS521 Figure 19. PWM Converter with Reference August 2003 10 Rev. 1.1 BOOKLY MICRO LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR Data Sheet 431L Mechanical Dimensions TO - 92 2.54 Unit: mm 5 3.50.1 1.250.1 1.5x0.2 4.50.1 4.950.35 0.46 1.5 0.38 August 2003 14.30.1 0.5 0.38 11 Rev. 1.1 BOOKLY MICRO LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR Data Sheet 431L Mechanical Dimensions (Continued) SOT - 23-3 0.6000.100 1.0000.100 0.100 GAUGE PLANE Unit: mm 1.050 REF 0 2. 0.0600.040 0.0 ~ 10. 0 0.200 MIN 0.550 REF 7.0 2.9000.100 0.400+0.050 -0.010 2.4000.100 0.9500.030 1.900 REF August 2003 1.3000.100 12 Rev. 1.1 +0.050 0.100 -0.020 3.0 7.0 BOOKLY MICRO LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR Data Sheet 431L Mechanical Dimensions (Continued) SOT - 23 - 5 2.900.10 0.150.07 Unit: mm 2.800.10 1.600.10 0.250.05 0.450.15 4 R0.10 4 R0.150.05 0.950.025 105 1.200.25 0.850.20 0.400.10 105 August 2003 0.080.07 13 Rev. 1.1 BOOKLY MICRO LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR Data Sheet 431L Mechanical Dimensions (Continued) SOT - 89 Unit: mm 4.500.10 1.730.10 1.40 * 00.076 1.500.10 4.100.15 1.050.15 2.450.15 R0.20 3 10 0.420.06 0.42 0.500.06 3.00 3 0.400.04 10 R0.15 August 2003 14 Rev. 1.1 |
Price & Availability of BM431L
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |