LM385 / 385B 1.2 & 2.5V MICROPOWER VOLTAGE REFERENCE T H E I N F I N I T E P O W E R O F I N N O V A T I O N P R O D U C T I O N D S A T A H E E T KEY FEATURES DESCRIPTION The LM385/385B Micropower Voltage The LM385 family is available in fixed 1.2V References are two terminal bandgap reference and 2.5V reference values. Process and circuit diodes designed and optimized for accurate low design optimization provides for high accuracy power operation in portable and other power with initial tolerance values of 1% for the sensitive systems. Operating currents are LM385B-1.2, 2% for the LM385-1.2, 1.5% for guaranteed from as low as 15µA up to 20mA for the LM385B-2.5, and 3% for the LM385-2.5. the LX385/385B-1.2, and 20µA up to 20mA for Complementing their initial accuracy, the the LM385/385B-2.5, giving designers a great bandgap reference is temperature compensated deal of flexibility in optimizing power to deliver 20ppm performance over the 0° to consumption, noise and ultimate application 70°C operating temperature range. performance. As an added feature, the The LM385 family from Linfinity is a pin-toreferences output impedance is extraordinarily pin replacement for the LM385/385B family of low over the entire operating range of quiescent voltage references. current. This enables an extremely wide dynamic load range with little effect on the overall reference accuracy. Guaranteed 1% Initial Accuracy (LM385B-1.2) NO T R OB EC SO OM L ME ET ND E P ED R FO OD R NE UC W T DE SIG NS Guaranteed 2.5% Initial Accuracy (LM385-1.2) Guaranteed 1.5% Initial Accuracy (LM385B-2.5) Guaranteed 3.0% Initial Accuracy (LM385-2.5) Guaranteed 20µA Operating Current Low Temperature coefficient Operating Current of 20µA to 20mA Very Low Dynamic Impedance: 10Ω APPLICATIONS IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com Portable Meter References Portable Test Instruments Battery Operated Systems Current Loop Instrumentation PRODUCT HIGHLIGHT 1.2V REFERENCE 5V 38K MICROPOWER REFERENCED FROM 9V BATTERY 9V 200K 1.2V 2.5V LM385-1.2V LM385-2.5V TA (°C) Reference Voltage 1.2V 0 to 70 2.5V PACKAGE ORDER INFO Plastic SOIC Initial DM 8-Pin Tolerance RoHS Compliant / Pb-free ±30mV ±12mV ±75mV ±38mV LP Plastic TO-92 3-Pin Transition DC: 0440 RoHS Compliant / Pb-free Transition DC: 0509 LM385DM-1.2 LM385BDM-1.2 LM385DM-2.5 LM385BDM-2.5 LM385LP-1.2 LM385BLP-1.2 LM385LP-2.5 LM385BLP-2.5 Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX385BDM-TR) Copyright © 1996 Rev. 1.2a,2005-03-08 LINFINITY MICROELECTRONICS INC. 11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570 1 PRODUCT DATABOOK 1996/1997 LM385/385B 1.2 & 2.5V M I C R O P O W E R V O LTA G E R E F E R E N C E P R O D U C T I O N A B S O L U T E M A X I M U M R AT I N G S D A T A S H E E T PACKAGE PIN OUTS (Note 1) NO T R OB EC SO OM L ME ET ND E P ED R FO OD R NE UC W T DE SIG NS Reverse Breakdown Current .................................................................................... 30mA Forward Current ........................................................................................................ 10mA Operating Temperature Range LM385 ........................................................................................................... 0°C to 70°C Storage Temperature Range ...................................................................... -65°C to 150°C Lead Temperature (soldering, 10 seconds) ............................................................. 300°C Pb-free / RoHS Peak Package Solder Reflow Temp (40second max. exposure) ................ 260°C (+0, -5) Note 1. Values beyond which damage may occur. All voltages are specified with respect to ground, and all currents are positive into the specified terminal T H E R MAL DATA DM PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA LP PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA N/C N/C N/C ANODE 1. 8. 2. 7. CATHODE N/C 6. CATHODE 5. N/C 3. 4. DM PACKAGE (Top View) 100% Pb-free / RoHS Matte Tin Lead Finish 1. ANODE 2. CATHODE 3. N/C 165ºC/W 165ºC/W LP PACKAGE (Top View) The θ JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. 2 Copyright © 1996 Rev. 1.2a 8/04 PRODUCT DATABOOK 1996/1997 LM385/385B 1.2 & 2.5V M I C R O P O W E R V O LTA G E R E F E R E N C E P R O D U C T I O N D A T A S H E E T ELECTRICAL CHARACTERISTICS LM385/385B-1.2 Parameter Reverse Breakdown Voltage NO T R OB EC SO OM L ME ET ND E P ED R FO OD R NE UC W T DE SIG NS (Unless otherwise specified, these specifications apply to TA = 25ºC. Typ number represents TA = 25ºC value.) Symbol LM385 LM385B VZ ∆VZ ∆Temp IMIN e ∆IR rz en ∆VZ ∆Time Average Temperature Coefficient Minimum Operating Current Reverse Breakdown Voltage Chang with Current Reverse Dynamic Impedance Wide Band Noise (RMS) Long Term Stability LM385/385B-2.5 Parameter Reverse Breakdown Voltage IMIN ≤ IR ≤ IMAX IMIN ≤ IR ≤ IMAX IR = 100µA Average Temperature Coefficient Minimum Operating Current Reverse Breakdown Voltage Chang with Current Reverse Dynamic Impedance Wide Band Noise (RMS) Long Term Stability VZ ∆VZ ∆Temp IMIN e ∆IR rz en ∆VZ ∆Time 1.205 1.223 ∆VZ IMIN ≤ IR ≤ 1mA 1mA ≤ IR ≤ 20mA IR = 100µA IR = 100µA, 10Hz ≤ f ≤ 10kHz IR = 100µA, TA = 25°C ± 0.1°C Symbol LM385 LM385B LM385/385B-1.2 Min. Typ. Max. Test Conditions 1.235 1.235 20 1.260 1.247 V V ppm/°C 8 15 1.5 20 µA mV mV Ω µV ppm/kHr 1 60 20 LM385/385B-2.5 Min. Typ. Max. Test Conditions IMIN ≤ IR ≤ IMAX IMIN ≤ IR ≤ IMAX IR = 100µA 2.425 2.462 ∆VZ IMIN ≤ IR ≤ 1mA 1mA ≤ IR ≤ 20mA IR = 100µA, f = 20Hz IR = 100µA, 10Hz ≤ f ≤ 10kHz IR = 100µA, TA = 25°C ± 0.1°C Units Units 2.500 2.500 20 2.575 2.538 V V ppm/°C 13 20 2 20 µA mV mV Ω µV ppm/kHr 1 120 20 GRAPH / CURVE INDEX Characteristic Curves LM385/385B-1.2 FIGURE # 1. RESPONSE TIME 2. 3. Characteristic Curves LM385/385B-2.5 FIGURE # 8. RESPONSE TIME REVERSE CHARACTERISTICS 9. REVERSE CHARACTERISTICS FORWARD CHARACTERISTICS 10. FORWARD CHARACTERISTICS 4. TEMPERATURE DRIFT 11. TEMPERATURE DRIFT 5. REVERSE VOLTAGE CHANGE 12. REVERSE DYNAMIC IMPEDANCE 6. REVERSE DYNAMIC IMPEDANCE 13. NOISE VOLTAGE 7. NOISE VOLTAGE Copyright © 1996 Rev. 1.2a 8/04 3 PRODUCT DATABOOK 1996/1997 LM385/385B 1.2 & 2.5V M I C R O P O W E R V O LTA G E R E F E R E N C E P R O D U C T I O N D A T A S H E E T NO T R OB EC SO OM L ME ET ND E P ED R FO OD R NE UC W T DE SIG NS C H A R A C T E R I S T I C C U R V E S — LM385/385B-1.2V FIGURE 1. — RESPONSE TIME FIGURE 2. — REVERSE CHARACTERISTICS 1.5V TA = 0 to 70°C 1.0V VIN 0.5V Input Voltage 0 5V 0 36k Reverse Current - (µA) Output Voltage 100 VOUT 10 1 0.1 0 50 100 500 0 550 0.2 0.4 Time - (µs) 0.8 1.0 1.2 1.4 Reverse Voltage - (V) FIGURE 3. — FORWARD CHARACTERISTICS FIGURE 4. — TEMPERATURE DRIFT 1.242 1.2 IR = 100µA TA = 25°C 1.24 Reference Voltage - (V) Forward Voltage - (V) 0.6 0.8 0.4 1.238 1.236 1.234 1.232 1.23 1.228 0 0.01 1.226 0.1 1 10 Forward Current - (mA) 4 100 0 10 20 30 40 50 60 70 Temperature - (°C) Copyright © 1996 Rev. 1.2a 8/04 PRODUCT DATABOOK 1996/1997 LM385/385B 1.2 & 2.5V M I C R O P O W E R V O LTA G E R E F E R E N C E P R O D U C T I O N D A T A S H E E T NO T R OB EC SO OM L ME ET ND E P ED R FO OD R NE UC W T DE SIG NS C H A R A C T E R I S T I C C U R V E S — LM385/385B-1.2V FIGURE 5. — REVERSE VOLTAGE CHANGE 16 1000 10 8 6 4 2 0 -2 -4 0.01 TA = 25°C IR = 100µA TA = 0 to 70°C Dynamic Impedance - (Ω) Output Voltage Change - (mV) 14 12 FIGURE 6. — REVERSE DYNAMIC IMPEDANCE 100 10 1 0.1 0.1 1 10 100 Reverse Current - (mA) 10 100 1k 10k 100k (f) Frequency - (Hz) FIGURE 7. — NOISE VOLTAGE 800 (VN) Noise Voltage - (nV/ Hz) 700 600 500 400 300 200 100 10 IR = 100µA TA = 25°C 100 1k 10k 100k (f) Frequency - (Hz) Copyright © 1996 Rev. 1.2a 8/04 5 PRODUCT DATABOOK 1996/1997 LM385/385B 1.2 & 2.5V M I C R O P O W E R V O LTA G E R E F E R E N C E P R O D U C T I O N D A T A S H E E T NO T R OB EC SO OM L ME ET ND E P ED R FO OD R NE UC W T DE SIG NS C H A R A C T E R I S T I C C U R V E S — LM385/385B-2.5V TA = 25°C 100 4.0V TA = 25°C 2.0V VIN 0 Input Voltage FIGURE 9. — REVERSE CHARACTERISTICS 5 0 24K Reverse Current - (µA) Output Voltage FIGURE 8. — RESPONSE TIME VOUT 10 1 0.1 0 1.0 Time - (100µs/Div.) 4.0 5.0 FIGURE 11. — TEMPERATURE DRIFT 2.52 TA = 25°C 2.515 Reference Voltage - (V) 0.8 Forward Voltage - (V) 3.0 Reverse Voltage - (V) FIGURE 10. — FORWARD CHARACTERISTICS 1.0 2.0 0.6 0.4 0.2 2.51 2.505 2.5 2.495 2.49 2.485 0 0.001 0.01 0.1 1 Forward Current - (mA) 6 10 100 2.48 -40 20 0 20 40 60 80 100 Temperature - (°C) Copyright © 1996 Rev. 1.2a 8/04 PRODUCT DATABOOK 1996/1997 LM385/385B 1.2 & 2.5V M I C R O P O W E R V O LTA G E R E F E R E N C E P R O D U C T I O N D A T A S H E E T NO T R OB EC SO OM L ME ET ND E P ED R FO OD R NE UC W T DE SIG NS C H A R A C T E R I S T I C C U R V E S — LM385/385B-2.5V FIGURE 12. — REVERSE DYNAMIC IMPEDANCE 100 (VN) Noise Voltage - (nV/ Hz) Dynamic Impedance - (Ω) TA = 25°C IR = 100µA FIGURE 13. — NOISE VOLTAGE 10 1 1800 1500 1200 900 600 300 0.1 10 100 1k 10k (f) Frequency - (Hz) Copyright © 1996 Rev. 1.2a 8/04 100k 10 IR = 100µA TA = 25°C 100 1k 10k 100k (f) Frequency - (Hz) 7