LM285/285B-1.2V LM285/285B-2.5V LM385/385B-1.2V LM385/385B-2.5V LOW POWER, BANDGAP VOLTAGE REFERENCES 2 FEATURES 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 15µA to 20mA operating current range make these voltage references especially attractive for multimeter, data acquisition and telecommunications applications. ■ ■ ■ ■ ■ 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 ........................... 15µA to 20mA LM285/385-2.5V ........................... 20µA to 20mA Temperature Coefficient .......................... 30ppm/°C Dynamic Impedance .......................................... 0.6Ω TO-92-3 Plastic Package 8-Pin Plastic Narrow Body (SOIC) Package SURFACE MOUNT 8-PIN PLASTIC SOIC APPLICATIONS ADC and DAC Reference Current Source Generation Threshold Detectors Power Supplies Multi-meters 3 PIN CONFIGURATIONS TO-92-3 PLASTIC (BOTTOM VIEW) ■ ■ ■ ■ ■ 1 3 2 4 NC 1 8 CATHODE NC 2 7 NC NC 3 6 NC ANODE 4 5 NC 1 5 LM285/285B E0A-1.2 LM285/285B EOA-2.5 LM385/385B COA-1.2 LM385/385B COA-2.5 LM285/285B EZB-1.2 LM285/285B EZB-2.5 LM385/385B CZB-1.2 LM385/385B CZB-2.5 NC = NO INTERNAL CONNECTION ORDERING INFORMATION Part No. Package Temperature Range Voltage Tolerance 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 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 – 40°C to +85°C – 40°C to +85°C – 40°C to +85°C – 40°C to +85°C – 40°C to +85°C – 40°C to +85°C – 40°C to +85°C – 40°C to +85°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 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 1% 1.5% 1% 1.5% 2% 3% 2% 3% 1% 1.5% 1% 1.5% 2% 3% 2% 3% 6 7 8 LM285/B/385/B-9 11/6/96 TELCOM SEMICONDUCTOR, INC. 3-9 LOW POWER, BANDGAP VOLTAGE REFERENCES 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 ................ – 65°C to +150°C Operating Temperature Range TO-92 Package ................................ – 40°C to +85°C Surface Mount Package ................... – 40°C to +85°C Lead Temperature (Soldering, 10 sec) TO-92 Package .............................................. +300°C Surface Mount Package ................................. +300°C Power Dissipation Limited by Forward/Reverse Current *Functional operation above the absolute maximum stress ratings is not implied. ELECTRICAL CHARACTERISTICS: TA = +25°C, unless otherwise specified. Symbol Parameter Test Conditions V(BR)R IR ≤ 20mA Z ∆V(BR)/∆T S 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 = +25°C TA = Tlow to Thigh (Note 1) Reverse Breakdown Voltage Change with Current IRmin = IR = 1.0mA, TA = +25°C TA = Tlow to Thigh (Note 1) 1.0mA = IR = 20mA, TA = +25°C TA = Tlow to Thigh (Note 1) Reverse Dynamic Impedance Average Temperature Coefficient Long Term Stability Symbol Parameter Test Conditions V(BR)R 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 = +25°C TA = Tlow to Thigh (Note 1) Reverse Breakdown Voltage Change with Current IRmin = IR = 1.0mA, TA = +25°C TA = Tlow to Thigh (Note 1) 1.0mA = IR = 20mA, TA = +25°C TA = Tlow to Thigh (Note 1) Reverse Dynamic Impedance Average Temperature Coefficient Long Term Stability IR = 20mA IRMIN ∆V(BR)R IRMIN ∆V(BR)R Z ∆V(BR)/∆T S LM285 / LM285B–1.2 Min Typ Max LM385 / LM385B–1.2 Min Typ Max Unit V 1.223 1.200 1.205 1.192 1.235 — 1.235 — 1.247 1.270 1.260 1.273 1.223 1.210 1.205 1.192 1.235 — 1.235 — 1.247 1.260 1.260 1.273 — — 8.0 — 15 20 — — 8.0 — 15 20 µA mV IR = 100µA 10µA ≤ IR ≤ 20mA IR = 100µA, TA = +25°C ±0.1°C — — — — — — — — — — — 0.6 30 20 1.0 1.5 10 20 — 100 — — — — — — — — LM285 / LM285B–2.5 Min Typ Max — — — — 0.6 30 20 1.0 1.5 20 25 — 100 — LM385 / LM385B–2.5 Min Typ Max Ω ppm/°C ppm/kHR Unit V 2.462 2.415 2.425 2.400 2.5 — 2.5 — 2.538 2.585 2.575 2.600 2.462 2.436 2.425 2.400 2.5 — 2.5 — 2.538 2.564 2.575 2.600 — — 13 — 20 30 — — 13 — 20 30 µA mV IR = 100µA 20µA ≤ IR ≤ 20mA IR = 100µA, TA = +25°C ±0.1°C Note: 1. Tlow = – 40°C for LM285-1.2, LM285-2.5, LM285B-1.2, LM285B-2.5 0°C for LM385-1.2, LM385B-1.2, LM385-2.5, LM385B-2.5 Thigh = +85°C for LM285-1.2, LM285-2.5, LM285B-1.2, LM285B-2.5 +70°C for LM385-1.2, LM385B-1.2, LM385-2.5, LM385B-2.5 3-10 — — — — — — — — — — — 0.6 30 20 1.0 1.5 10 20 — 100 — — — — — — — — — — — — 0.6 30 20 2.0 2.5 20 25 — 100 — Ω ppm/°C ppm/kHR 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 Battery Powered 1.25V Reference +15V 50 kΩ 3 + LM285/385-1.2V +9V 7 6 2.5V 2 Precision Current Source 2 TC911 – 4 VOUT = 10V 360 kΩ +15V 1.25V 81 kΩ 2 – 1 µF 3 7 6 LM285/385 -2.5V 180 kΩ LM285/385-1.2V 60 kΩ 3 TC911 + 4 R SET 0.1 µF I OUT = 1.25V R SET 4 RESPONSE TIME TEST CIRCUIT 5 36 kΩ OUTPUT INPUT LM285/385-1.2V LM285/385-2.5V 6 7 8 TELCOM SEMICONDUCTOR, INC. 3-11 LOW POWER, BANDGAP VOLTAGE REFERENCES 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 Change vs Reverse Current LM285/385-1.2V: Output Voltage vs Reverse Current 10 TA = +25°C 100 10 1 0.25 0.5 0.75 1.0 1.25 OUTPUT VOLTAGE (V) 8 6 4 2 0 0.01 1.5 TA = +25°C REVERSE CURRENT (µA) 5.0 INPUT 0 1.5 OUTPUT 0.5 100 10 1 0.1 200 400 TIME (µsec) 0.4 0.2 0 0.01 100 TA = +25°C 0 0 0.6 0 600 LM285/385-2.5V: Forward Voltage vs Forward Current 0.5 1.0 1.5 2.0 2.5 OUTPUT VOLTAGE (V) 3.0 0.1 1 10 FORWARD CURRENT (mA) 100 LM285/385-2.5V: Output Voltage Change vs Reverse Current 10 1000 10.0 VOLTAGE (V) 0.1 1 10 REVERSE CURRENT (mA) 0.8 LM285/385-2.5V: Output Voltage vs Reverse Current LM285/385-1.2V Response Time 1.0 TA = +25°C 1.0 OUTPUT VOLTAGE CHANGE (mV) 0 1.2 TA = +25°C FORWARD VOLTAGE (V) OUTPUT VOLTAGE CHANGE (mV) REVERSE CURRENT (µA) 1000 0.1 LM285/385-1.2V: Forward Voltage vs Forward Current 8 TA = +25°C 6 4 2 0 0.01 0.1 1 10 REVERSE CURRENT (mA) 100 LM285/385-2.5V Response Time 10 1.2 5 TA = +25°C INPUT VOLTAGE (V) FORWARD VOLTAGE (V) TA = +25°C 1.0 0.8 0.6 0.4 3-12 3 OUTPUT 2 1 0.2 0 0.01 0 0.1 1 10 FORWARD CURRENT (mA) 100 0 0 200 400 TIME (µsec) 600 TELCOM SEMICONDUCTOR, INC.