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| PRECISION 2.5 VOLT MICROPOWER VOLTAGE REFERENCE ISSUE 5 - FEBRUARY 1998 DEVICE DESCRIPTION The ZR285 uses a bandgap circuit de si g n t o a c h i e v e a p r e c i s i on micropower voltage reference of 2.5 volts. The device is available in small outline surface mount packages, ideal for applications where space saving is important, as well as packages for through hole requirements. The ZR285 design provides a stable voltage without an external capacitor and is stable with capacitive loads. The ZR285 is recommended for operation between 20A and 20mA and so is ideally suited to low power and battery powered applications. Excellent performance is maintained to an absolute maximum of 30mA, however the rugged design and 20 volt processing allows the reference to wi t hst an d transi ent effects and currents up to 200mA. Superior switching capability allows the device to reach stable operating conditions in only a few microseconds. ZR285-2.5 FEATURES * * * * * * * * * * * * * * * Small outline SOT23 and SO8 packages TO92 style packages No stabilising capacitor required Low knee current, 15A typical Typical TC 30ppm/C Typical slope resistance 0.4 3%, 2% and 1% tolerance Industrial temperature range Operating current 20A to 20mA APPLICATIONS Battery powered and portable equipment. Metering and measurement systems. Instrumentation. Test equipment. Data acquisition systems. Precision power supplies. SCHEMATIC DIAGRAM V R G nd 4-165 ZR285-2.5 ABSOLUTE MAXIMUM RATING Reverse Current Forward Current Operating Temperature Storage Temperature 30mA 25mA -40 to 85C -55 to 125C Power Dissipation (Tamb=25C) SO8 625mW SOT23 330mW E-Line,2 Pin(TO92) 500mW E-Line,3 Pin(TO92) 500mW ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated) Tamb=25C SYMBOL PARAMETER CONDITIONS MIN VR Reverse Breakdown Voltage IR=150A LIMITS TYP MAX 2.525 1 2.55 2 2.575 3 20 20 30 IR = 1mA to 20mA IR = 1mA f = 100Hz IAC= 0.1 IR IR = 150A f = 10Hz to 10kHz 0.4 0.3 90 1 0.8 V TOL. % UNITS 2.475 2.5 2.45 2.5 2.425 2.5 13 0.02 IMIN IR TC RS ZR Minimum Operating Current Recommended Operating Current Average Reverse Breakdown Voltage Temp. Co. Slope Resistance Reverse Dynamic Impedance A mA ppm/C EN Wideband Noise Voltage 60 V (rms) TC = (VR(max)-VR(min)) x 1000000 VR x (T(max)-T(min)) Reverse Current (A) 40 Note: VR(max) - VR(min) is the maximum deviation in reference voltage measured over the full operating temperature range. 30 20 RS = VR Change(IR (min) to IR (max)) IR (max) - IR (min) 10 TA=25C 0 0 1.0 2.0 3.0 Reverse Voltage (V) Reverse Characteristics 4-166 ZR285-2.5 TYPICAL CHARACTERISTICS 1.4 2.51 1.2 IR=150A to 5mA Reference voltage (V) 1 10 100 2.50 Forward Voltage (V) 1.0 0.8 2.49 0.6 0.4 2.48 0.2 2.47 0.001 0.01 0.1 -40 -20 0 20 40 60 80 Forward Current (mA) Temperature (C) Forward Characteristics 1000 1.4 1.2 Temperature Drift Slope resistance () 1.0 0.8 Slope resistance () 85C 25C -40C IR=150A 100 10 0.6 IR=5mA 1 0.4 0.2 IR=1mA 0.1 1 10 100 10 100 1K 10K 100K Reference Current (mA) Frequency (kHz) Slope Resistance v Current Slope Resistance v Frequency VIN (V) 10 10 VIN (V) 0 0 IR=5mA 3 IR=5mA 2 IR=150A 1 VR (V) 2 0 VR (V) 1 IR=150A 0 0 4 8 12 16 0 4 8 12 16 Time (s) Time (s) Transient Response - Single pulse Transient Response - Repetitive Test 4-167 ZR285-2.5 CONNECTION DIAGRAMS E-Line, 2 pin Package Suffix - Y E-Line, 3 pin,Rev Package Suffix - R Bottom View Bottom View - Pin 3 floating or connected to pin 1 SOT23 Package Suffix - F SO8 Package Suffix - N8 Top View - Pin 1 floating or connected to pin 2 Top View ORDERING INFORMATION Part No Tol% Package Partmark Part No Tol% Package Partmark ZR285F03 ZR285F02 ZR285F01 ZR285N803 ZR285N802 ZR285N801 ZR285R03 ZR285R02 3 2 1 3 2 1 3 2 SOT23 SOT23 SOT23 SO8 SO8 SO8 E-Line * E-Line * 28A 28B 28C ZR285803 ZR285802 ZR285801 ZR28503 ZR28502 ZR285R01 ZR285Y03 ZR285Y02 ZR285Y01 1 3 2 1 E-Line * E-Line E-Line E-Line ZR28501 ZR28503 ZR28502 ZR28501 * E-Line 3 pin Reversed E-Line 2 pin 4-168 |
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