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| LM385/LM385B Adjustable Micropower Voltage Reference n FEATURES l l l l l n DESCRIPTION The LM385 is micropower 3-terminal adjustable band-gap voltage reference. Operating from 1.24V to 5.3V and over 10A to 20mA current range. They feature exceptionally low dynamic impedance and good temperature stability. Onchip trimming is used to achieve tight voltage tolerance. Since the LM385 band-gap reference uses only transistors and resistors, low noise and good longterm stability result. Careful design of the LM385 has made the device tolerant of capacitive loading, making it easy to use in almost any reference application. The wide dynamic operating range allows its use with widely varying supplies with excellent regulation. The extremely low power drain of the LM385 makes it useful for micropower circuitry. This voltage reference can be used to make portable meters, regulators or general purpose analog 1.24V Adjustable from 1.24V to 5.3V. Operating Current from 10A to 20mA. Low Temperature Coefficient. 1% and 2% Initial Tolerance. Low Dynamic Impedance. n APPLICATIONS l l l l l l l Portable, Battery-Powered Equipment. Instrumentation. Process Control. Energy Management. Product Testing. Automotive. Precision Audio Components. n TYPICAL APPLICATION CIRCUIT V IN RS circuitry with battery life approaching shelf life. Further, the wide operating current allows it to replace older references with a tighter tolerance part. + LM385 IR FB - Precision 1.24V Voltage Reference Analog Integrations Corporation 4F, 9 Industry E. 9th Rd, Science-Based Industrial Park, Hsinchu, Taiwan TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw DS-385B-01 012102 1 LM385/LM385B n ORDERING INFORMATION LM385X-CXXX PACKING TYPE BG: BAG TR: TAPE & REEL TB: TUBE (for SO-8) PACKAGE TYPE X: SOT-89 Z: TO-92 S: SMALL OUTLINE TOLERANCE Default: 2% B: 1% Example: LM385-CXTR a 2% version, in SOT-89 Package & Taping & Reel Packing Type (CS is not available in BAG packing type.) PIN CONFIGURATION SOT-89 TOP VIEW 1: FB 2: 3: + 1 2 3 TO-92 TOP VIEW 1: FB 2: + 3: SO-8 TOP VIEW NC NC NC 1 2 3 4 8 7 6 5 + NC NC FB 1 2 3 - n ABSOLUTE MAXIMUM RATINGS Reverse Current ....... ................................... ... ... ... ... ............................................ 30mA Forward Current ... ... ... ....................................... ..... ... ... ... .....................................10mA Operating Temperature Range. .... ... ... ... ... ... ... ... .... ... ... ................... ........ 0C to 70C Storage Temperature ...................................... ... .... ... ... ... ....................... -65C to 150C Lead Temperature TO-92 Package Soldering (10 seconds) SO Package Vapor phase (60 seconds) ..................... ... ... ... ... ... ..... ... ................ 260C ............... ... ... ... ... ... ... ... ........................ 215C n TEST CIRCUIT Refer to TYPICAL APPLICATION CIRCUIT. 2 LM385/LM385B n ELECTRICAL CHARACTERISTICS (T =25C, unless otherwise specified.) A PARAMETER Reverse Voltage Reverse Voltage Change with Current Minimum Operating Current TEST CONDITIONS IR=100A IRMIN IR 1mA 1mAIR 20mA VOUT =1.24V VOUT =5.3V IR=100A, f=100Hz IAC=0.1IR, VOUT =1.24V, VOUT =5.3V LM385B LM385 SYMBOL MIN. TYP. 1.240 1.240 0.2 5 7 MAX. 1.252 1.265 1 15 11 55 UNIT V VR 1.228 1.215 VR mV A IRMIN 35 Dynamic Output Impedance Reference Voltage Change with Output Voltage Feedback Current ZR 0.4 1 2 5 20 IR=100A IFB IR=100A, 10Hz 8 Output Wideband Noise Average Temperature Coefficient (Note) Long Term Stability Note : VOUT =1.24V, VOUT =5.3V IR=100A IR=100A, T=1000Hrs, TA=25C0.1C eN VR VR/t 50 170 100 20 VRMS ppm/C ppm The average temperature coefficient is defined as the maximum deviation of reverse voltage at all measured temperatures from TMIN to TMAX, divided by TMAX - TMIN. The measured temperatures are 0C, 25C, 50C and 70C. n TYPICAL PERFORMANCE CHARACTERISTICS 1.0 100 Forward Voltage (V) 0.8 TA= -55 C TA= 25 C Reverse Current ( A) 10 0.6 TA= 125 C TA= -55 C 0.4 TA= 25 C 1 TA= 125 C 0.2 0 0.1 0.01 0.1 1 10 100 0 0.2 0.4 0.6 0.8 1 1.2 1.4 Forward Current (mA) Fig. 1 Forward characteristics Reverse Voltage (V) Fig. 2 Reverse Characteristics 3 LM385/LM385B n TYPICAL PERFORMANCE CHARACTERISTICS (Continued) 1.27 5 Output Voltage Change (mV) IR =100A Reference voltage (V) 4 1.25 3 2 1.23 TA= 25 C 1 TA= -55 C TA= 80 C 1.21 -50 0 50 100 125 0 0.01 0.1 1 10 100 Temperature (C) Fig. 3 Temperature Drift of 3 Representative Units Reverse Current (mA) Fig. 4 Reverse Characteristics 80 10 IR=100A Minimum Current (A) 60 Feedback Current (nA) 8 6 VOUT=VREF 4 40 VOUT=5.3V 20 2 0 1 2 3 4 5 6 0 -20 0 20 40 60 80 100 120 Output Voltage (V) Fig. 5 Minimum Operating Current Temperature ( C) Fig. 6 Feedback Current 10K 5 V OUT=5.3V 4 I R=100A Input Voltage (V) 3 2 1 0 10 Output 50K + 120K 1K 364K Noise V OUT V OUT= VREF 100 Input 0 -50 0 10 150 200 250 Time (S) Fig. 7 Response Time 50 100 10 100 1K 10K 100K Frequency (Hz) Fig. 8 Output Noise Voltage ( nV / Hz ) 4 LM385/LM385B n BLOCK DIAGRAM + 1.2 + FB 7 A n SYMBOL + FB - - n PIN DESCRIPTIONS PIN + PIN sinks current with a range from 20A to 20mA for normal applications. And a stable positive voltage, relative to Pin-, occurs on Pin+. Pin- sources current for normal application. The current value is the same as Pin+. Not connected. PIN NC - n APPLICATION EXAMPLES V IN R4 50A R3 100 A LM385 2N2219 FB R1 120K + FB R1 120K R2 2.4M - R3 1K 2N5115 Fig. 9 200mA Shunt Regulator V IN + R1 FB Fig. 10 25V Low Current Shunt Regulator R1 120K + FB 2N2905 2N3964 R2 120K 1 A -5V Fig. 11 Current Source Fig. 12 Voltage Level Detector 5 LM385/LM385B n APPLICATION EXAMPLES D1 R1 120K + FB (Continued) R2 1M R3 330 >-12V LED ON -5V Fig. 13 Voltage Level Detector n PHYSICAL DIMENSIONS l SOT-89 (unit: mm) D D1 C A SYMBOL A B C D MIN 1.40 0.36 0.35 4.40 1.62 2.29 MAX 1.60 0.48 0.44 4.60 1.83 2.60 1.50 (TYP.) 3.00 (TYP.) H E D1 E e L e e1 B e1 H L 3.94 0.89 4.25 1.20 l SOT-89 Marking Marking AI01 AIB01 Part No. LM385CX LM385BCX 6 LM385/LM385B l TO-92 (unit: mm) A L C E SYMBOL A C MIN 4.32 MAX 5.33 0.38 (TYP.) e1 D D E e1 L 4.40 3.17 1.27 (TYP.) 12.7 5.20 4.20 - l 8 LEAD PLASTIC SO (unit: mm) D SYMBOL A A1 H E MIN 1.35 0.10 0.33 0.19 4.80 3.80 MAX 1.75 0.25 0.51 0.25 5.00 4.00 1.27(TYP) 6.20 1.27 B C D E e e A C A1 H L L 5.80 0.40 B 7 |
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