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| LM285/285B-1.2V LM285/285B-2.5V LM385/385B-1.2V LM385/385B-2.5V LOW POWER, BANDGAP VOLTAGE REFERENCES FEATURES s s Output Tolerance ....................................... 1% or 2% Output Voltage Option LM285/385-1.2V ........................................ 1.235V LM285/385-2.5V ............................................ 2.5V Wide Operating Current Range LM285/385-1.2V ........................... 15A to 20mA LM285/385-2.5V ........................... 20A to 20mA Temperature Coefficient .......................... 30ppm/C Dynamic Impedance .......................................... 0.6 TO-92-3 Plastic Package 8-Pin Plastic Narrow Body (SOIC) Package 1 GENERAL DESCRIPTION The LM285/385-1.2V (1.235V output) and LM285/3852.5V (2.5V output) are bipolar, two-terminal, bandgap voltage references that offer precision performance without premium price. These devices do not require thin-film resistors, greatly lowering manufacturing complexity and cost. A 30ppm/C output temperature coefficient and a 15A to 20mA operating current range make these voltage references especially attractive for multimeter, data acquisition and telecommunications applications. PIN CONFIGURATIONS TO-92-3 PLASTIC (BOTTOM VIEW) SURFACE MOUNT 8-PIN PLASTIC SOIC NC NC NC 1 2 3 8 7 6 5 CATHODE NC NC NC 2 3 4 5 6 7 s s s s s APPLICATIONS s s s s s ADC and DAC Reference Current Source Generation Threshold Detectors Power Supplies Multi-meters 3 2 1 ANODE 4 LM285/285B EZB-1.2 LM285/285B EZB-2.5 LM385/385B CZB-1.2 LM385/385B CZB-2.5 LM285/285B E0A-1.2 LM285/285B EOA-2.5 LM385/385B COA-1.2 LM385/385B COA-2.5 NC = NO INTERNAL CONNECTION ORDERING INFORMATION Part No. LM285BEOA-1.2 LM285BEOA-2.5 LM285BEZB-1.2 LM285BEZB-2.5 LM285EOA-1.2 LM285EOA-2.5 LM285EZB-1.2 LM285EZB-2.5 LM385BCOA-1.2 LM385BCOA-2.5 LM385BCZB-1.2 LM385BCZB-2.5 LM385COA-1.2 LM385COA-2.5 LM385CZB-1.2 LM385CZB-2.5 Package 8-Pin SOIC 8-Pin SOIC TO-92-3 TO-92-3 8-Pin SOIC 8-Pin SOIC TO-92-3 TO-92-3 8-Pin SOIC 8-Pin SOIC TO-92-3 TO-92-3 8-Pin SOIC 8-Pin SOIC TO-92-3 TO-92-3 Temperature Range - 40C to +85C - 40C to +85C - 40C to +85C - 40C to +85C - 40C to +85C - 40C to +85C - 40C to +85C - 40C to +85C 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C Voltage 1.2 2.5 1.2 2.5 1.2 2.5 1.2 2.5 1.2 2.5 1.2 2.5 1.2 2.5 1.2 2.5 Tolerance 1% 1.5% 1% 1.5% 2% 3% 2% 3% 1% 1.5% 1% 1.5% 2% 3% 2% 3% LM285/B/385/B-9 11/6/96 8 3-9 TELCOM SEMICONDUCTOR, INC. LM285/285B-1.2V LM285/285B-2.5V LM385/385B-1.2V LM385/385B-2.5V ABSOLUTE MAXIMUM RATINGS* Forward Current .................................................... +10mA Reverse Current .................................................... +30mA Storage Temperature Range ................ - 65C to +150C Operating Temperature Range TO-92 Package ................................ - 40C to +85C Surface Mount Package ................... - 40C to +85C LOW POWER, BANDGAP VOLTAGE REFERENCES Lead Temperature (Soldering, 10 sec) TO-92 Package .............................................. +300C Surface Mount Package ................................. +300C Power Dissipation Limited by Forward/Reverse Current *Functional operation above the absolute maximum stress ratings is not implied. ELECTRICAL CHARACTERISTICS: TA = +25C, unless otherwise specified. Symbol V(BR)R Parameter Reverse Breakdown Voltage LM285B-1.2/LM385B-1.2 TA = Tlow to Thigh (Note 1) LM285-1.2V/LM385-1.2V TA = Tlow to Thigh (Note 1) Minimum Operating Current TA = +25C TA = Tlow to Thigh (Note 1) Reverse Breakdown Voltage Change with Current IRmin = IR = 1.0mA, TA = +25C TA = Tlow to Thigh (Note 1) 1.0mA = IR = 20mA, TA = +25C TA = Tlow to Thigh (Note 1) Reverse Dynamic Impedance Average Temperature Coefficient Long Term Stability Test Conditions IR 20mA LM285 / LM285B-1.2 Min Typ Max 1.223 1.200 1.205 1.192 -- -- 1.235 -- 1.235 -- 8.0 -- 1.247 1.270 1.260 1.273 15 20 LM385 / LM385B-1.2 Min Typ Max 1.223 1.210 1.205 1.192 -- -- 1.235 -- 1.235 -- 8.0 -- 1.247 1.260 1.260 1.273 Unit V IRMIN A 15 20 mV -- -- -- -- -- -- -- -- -- -- -- 0.6 30 20 1.0 1.5 10 20 -- 100 -- -- -- -- -- -- -- -- -- -- -- -- 0.6 30 20 1.0 1.5 20 25 -- 100 -- V(BR)R Z V(BR)/T S IR = 100A 10A IR 20mA IR = 100A, TA = +25C 0.1C ppm/C ppm/kHR Symbol V(BR)R Parameter Reverse Breakdown Voltage LM285B-2.5/LM385B-2.5 TA = Tlow to Thigh (Note 1) LM285-2.5V/LM385-2.5V TA = Tlow to Thigh (Note 1) Minimum Operating Current TA = +25C TA = Tlow to Thigh (Note 1) Reverse Breakdown Voltage Change with Current IRmin = IR = 1.0mA, TA = +25C TA = Tlow to Thigh (Note 1) 1.0mA = IR = 20mA, TA = +25C TA = Tlow to Thigh (Note 1) Reverse Dynamic Impedance Average Temperature Coefficient Long Term Stability Test Conditions IR = 20mA LM285 / LM285B-2.5 Min Typ Max 2.462 2.415 2.425 2.400 -- -- 2.5 -- 2.5 -- 13 -- 2.538 2.585 2.575 2.600 20 30 LM385 / LM385B-2.5 Min Typ Max 2.462 2.436 2.425 2.400 -- -- 2.5 -- 2.5 -- 13 -- 2.538 2.564 2.575 2.600 Unit V IRMIN A 20 30 mV -- -- -- -- -- -- -- -- -- -- -- 0.6 30 20 1.0 1.5 10 20 -- 100 -- -- -- -- -- -- -- -- -- -- -- -- 0.6 30 20 2.0 2.5 20 25 -- 100 -- V(BR)R Z V(BR)/T S IR = 100A 20A IR 20mA IR = 100A, TA = +25C 0.1C ppm/C ppm/kHR Note: 1. Tlow = - 40C for LM285-1.2, LM285-2.5, LM285B-1.2, LM285B-2.5 0C for LM385-1.2, LM385B-1.2, LM385-2.5, LM385B-2.5 Thigh = +85C for LM285-1.2, LM285-2.5, LM285B-1.2, LM285B-2.5 +70C for LM385-1.2, LM385B-1.2, LM385-2.5, LM385B-2.5 3-10 TELCOM SEMICONDUCTOR, INC. LOW POWER, BANDGAP VOLTAGE REFERENCES LM285/285B-1.2V LM285/285B-2.5V LM385/385B-1.2V LM385/385B-2.5V 1 TYPICAL APPLICATIONS 10V Reference +15V 3 + 7 6 2 TC911 - 4 VOUT = 10V Battery Powered 1.25V Reference Precision Current Source 2 3 50 k +9V LM285/385-1.2V 360 k 1.25V 81 k 2 +15V - 7 1 F 2.5V LM285/385 -2.5V 60 k 6 180 k LM285/385-1.2V 0.1 F 3 TC911 + 4 R SET I OUT = 1.25V R SET 4 5 6 7 RESPONSE TIME TEST CIRCUIT 36 k OUTPUT INPUT LM285/385-1.2V LM285/385-2.5V 8 TELCOM SEMICONDUCTOR, INC. 3-11 PRELIMINARY INFORMATION LM285/285B-1.2V LM285/285B-2.5V LM385/385B-1.2V LM385/385B-2.5V TYPICAL CHARACTERISTICS LM285/385-1.2V: Output Voltage vs Reverse Current 1000 OUTPUT VOLTAGE CHANGE (mV) REVERSE CURRENT (A) LOW POWER, BANDGAP VOLTAGE REFERENCES LM285/385-1.2V: Output Voltage Change vs Reverse Current 10 FORWARD VOLTAGE (V) 1.2 TA = +25C 8 1.0 0.8 0.6 0.4 0.2 LM285/385-1.2V: Forward Voltage vs Forward Current TA = +25C TA = +25C 100 6 10 4 1 2 0 0.01 0.1 0 0.25 0.5 0.75 1.0 1.25 OUTPUT VOLTAGE (V) LM285/385-1.2V Response Time 1.5 0.1 1 10 REVERSE CURRENT (mA) 100 0 0.01 0.1 1 10 FORWARD CURRENT (mA) 100 LM285/385-2.5V: Output Voltage vs Reverse Current 1000 REVERSE CURRENT (A) 10.0 TA = +25C 5.0 INPUT VOLTAGE (V) 0 1.5 1.0 0.5 0 0 200 400 TIME (sec) 600 OUTPUT LM285/385-2.5V: Output Voltage Change vs Reverse Current 10 OUTPUT VOLTAGE CHANGE (mV) TA = +25C 100 8 TA = +25C 6 10 4 1 2 0.1 0 0.5 1.0 1.5 2.0 2.5 OUTPUT VOLTAGE (V) LM285/385-2.5V Response Time TA = +25C INPUT 3.0 0 0.01 0.1 1 10 REVERSE CURRENT (mA) 100 LM285/385-2.5V: Forward Voltage vs Forward Current 1.2 TA = +25C FORWARD VOLTAGE (V) 1.0 0.8 0.6 0.4 0.2 0 0.01 VOLTAGE (V) 10 5 0 3 2 1 0 0 OUTPUT 0.1 1 10 FORWARD CURRENT (mA) 100 200 400 TIME (sec) 600 3-12 TELCOM SEMICONDUCTOR, INC. |
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