PRECISION 2.5 VOLT MICROPOWER VOLTAGE REFERENCE ZRA250 ISSUE 4 - APRIL 2002 DEVICE DESCRIPTION FEATURES The ZRA250 uses a bandgap circuit design to achieve a precision 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. • • • • • • • • The ZRA250 design provides a stable voltage without an external capacitor and is stable with capacitive loads. The ZRA250 is recommended for operation between 50µA and 5mA and so is ideally suited to low power and battery powered applications. • Excellent performance is maintained to an absolute maximum of 25mA, however the rugged design and 20 volt processing allows the reference to withstand transient effects and currents up to 200mA. Superior switching capability allows the device to reach stable operating conditions in only a few microseconds. Small outline SOT23, SO8 and TO92 style packages. No stabilising capacitor required Typical TC 30ppm/°C Typical slope resistance 0.4Ω ± 3%, 2%,1% and 0.5% tolerance Industrial temperature range Operating current 50µA to 5mA Transient response, stable in less than 10µs Optional extended current range APPLICATIONS • • • • • • Battery powered and portable equipment. Metering and measurement systems. Instrumentation. Test equipment. Data acquisition systems. Precision power supplies. SCHEMATIC DIAGRAM VR G nd 4-232 Note: 3%, 2% and 1% tolerance devices are not recommended for new designs. Refer to ZRC250 ZRA250 Power Dissipation (Tamb=25°C) SOT23 330mW E-Line, 3 pin (TO92) 500mW E-Line, 2 pin (TO92) 500mW SO8 625mW ABSOLUTE MAXIMUM RATING Reverse Current Forward Current Operating Temperature Storage Temperature 25mA 25mA -40 to 85°C -55 to 125°C ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated) Tamb=25°C SYMBOL PARAMETER CONDITIONS LIMITS TOL. % UNITS MIN TYP MAX 2.4875 2.475 2.45 2.425 2.5 2.5 2.5 2.5 2.5125 2.525 2.55 2.575 25 50 µA 5 mA VR Reverse Breakdown Voltage IR=150µA IMIN Minimum Operating Current IR Recommended Operating Current TC † Average Reverse Breakdown Voltage Temp. Co. IR(min) to IR(max) Slope Resistance 30 90 ppm/°C 0.4 2 Ω ZR Reverse Dynamic Impedance IR = 1mA f = 100Hz IAC= 0.1 IR 0.3 0.8 Ω EN Wideband Noise Voltage 45 † IR = 150µA f = 10Hz to 10kHz (VR(max)−VR(min)) x 1000000 TC = VR x (T(max)−T(min)) Note: VR(max) - VR(min) is the maximum deviation in reference voltage measured over the full operating temperature range. § RS = VR Change (IR (min) to IR (max)) IR (max) − IR (min) V µV(rms) 60 Reverse Current (µA) RS § 0.05 0.5 1 2 3 50 40 30 20 TA 10 5°C =8 5°C C =2 ° TA -40 = TA 0 0.2 0.6 1.0 1.4 1.8 2.2 Reverse Voltage (V) Reverse Characteristics 4-233 2.6 ZRA250 1.4 2.53 1.2 2.52 Reference voltage (V) Forward Voltage (V) TYPICAL CHARACTERISTICS 1.0 0.8 0.6 0.4 0.2 IR =150µA to 5mA 2.51 2.50 2.49 2.48 2.47 0.1 10 1 100 1000 -40 -20 Forward Current (mA) 0 20 40 60 80 Temperature (°C) Forward Characteristics Temperature Drift 1000 0.5 TA=-40°C TA=25°C Slope resistance (Ω) Slope resistance (Ω) IR=150µA 1.0 100 IR=1mA 10 IR=5mA 1 TA=85°C 0.1 0 0.1 1 0.01 10 0.1 100 3.0 2.0 VR - (V) 3.0 INPUT 50K 1.0 OUTPUT 2.0 10 10 0 1 2 3 1K5 OUTPUT 0 0 INPUT 1.0 0 VIN - (V) VR - (V) 10 Slope Resistance v Frequency Slope Resistance v Current VIN - (V) 1 Frequency (kHz) Reference Current (mA) 0 0 4 Time (µs) 0.1 0.2 0.3 Time (µs) µA) Transient Response (IR=150µ Transient Response (IR=5mA) 4-234 0.4 ZRA250 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 E-Line, 3 pin Package Suffix – A SO8 Package Suffix – N8 Bottom View – Pin 1 floating or connected to pin 3 Top View SOT23 Package Suffix – F Top View – Pin 1 floating or connected to pin 2 4-235 ZRA250 ORDERING INFORMATION Part No Tol% Package Partmark Part No Tol% Package Partmark ZRA250A03 3 E-Line • ZRA25003 ZRA250R03 3 E-Line * ZRA250R3 ZRA250A02 2 E-Line • ZRA25002 ZRA250R02 2 E-Line * ZRA250R2 ZRA250A01 1 E-Line • ZRA25001 ZRA250R01 1 E-Line * ZRA250R1 ZRA250A005 0.5 E-Line • ZRA250005 ZRA250R005 0.5 E-Line * ZRA250R05 ZRA250F03 3 SOT23 25A ZRA250Y03 3 E-Line † ZRA25003 ZRA250F02 2 SOT23 25B ZRA250Y02 2 E-Line † ZRA25002 ZRA250F01 1 SOT23 25C ZRA250Y01 1 E-Line † ZRA25001 ZRA250F005 0.5 SOT23 25Y ZRA250Y005 0.5 E-Line † ZRA250005 ZRA250N803 3 SO8 ZRA25003 ZRA250N802 2 SO8 ZRA25002 ZRA250N801 1 SO8 ZRA25001 SO8 ZRA250005 ZRA250N8005 0.5 * E-Line 3 pin Reversed † E-Line 2 pin • E-Line 3 pin Note: 3%, 2% and 1% tolerance devices are not recommended for new designs. Refer to ZRC250 4-236