PRECISION 2.5 VOLT LOW KNEE CURRENT VOLTAGE REFERENCE ZRC250 ISSUE 4 - JANUARY 2003 DEVICE DESCRIPTION FEATURES The ZRC250 uses a bandgap circuit design to achieve a precision micropower voltage reference of 2.5 volts. The device is available in a small outline surface mount package, ideal for applications where space saving is important, as well as a package for through hole requirements. * * * * * * * * * * The ZRC250 design provides a stable voltage without an external capacitor and is stable with capacitive loads. The ZRC250 is recommended for operation between 20A 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 an d cu rrents up to 200mA. Superior switching capability allows the device to reach stable operating conditions in only a few microseconds. Small outline SOT23 package 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 5mA Transient response, stable in less than 10s Optional extended current range APPLICATIONS * Battery powered and portable equipment. * * Instrumentation. Test equipment. SCHEMATIC DIAGRAM V R G nd 4-247 ZRC250 ABSOLUTE MAXIMUM RATING Reverse Current Forward Current Operating Temperature Storage Temperature Power Dissipation (Tamb=25C) SOT23 330mW E-line, 3 pin (TO92) 500mW 25mA 25mA -40 to 85C -55 to 125C ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated) Tamb=25C CONDITIONS SYMBOL PARAMETER VR Reverse Breakdown Voltage IMIN Minimum Operating Current IR Recommended Operating Current TC Average Reverse Breakdown Voltage Temp. Co. IR=150A LIMITS TYP MAX 2.475 2.45 2.425 2.5 2.5 2.5 2.525 2.55 2.575 13 20 A 5 mA 30 90 ppm/C 0.4 1 0.8 0.02 ZR Reverse Dynamic Impedance IR = 1mA f = 100Hz IAC= 0.1 IR 0.3 EN Wideband Noise Voltage IR = 150A f = 10Hz to 10kHz 60 VR x (T(max)-T(min)) V(rms) 30 Reverse Current (A) RS = V 40 (VR(max)-VR(min)) x 1000000 Note: VR(max) - VR(min) is the maximum deviation in reference voltage measured over the full operating temperature range. 1 2 3 IR(min) to IR(max) Slope Resistance TC = UNITS MIN RS TOL% VR Change (IR (min) to IR (max)) 20 TA=25C 10 IR (max) - IR (min) 0 0 1.0 2.0 Reverse Voltage (V) Reverse Characteristics 4-248 3.0 ZRC250 TYPICAL CHARACTERISTICS 1.4 2.51 IR=150A to 5mA Reference voltage (V) Forward Voltage (V) 1.2 1.0 0.8 0.6 0.4 2.50 2.49 2.48 0.2 2.47 0.001 0.01 1 0.1 100 10 -40 -20 0 20 60 40 Forward Current (mA) Temperature (C) Forward Characteristics Temperature Drift 80 1000 1.4 IR=150A 85C 25C -40C 1.0 Slope resistance () Slope resistance () 1.2 0.8 0.6 0.4 100 10 IR=5mA 1 IR=1mA 0.2 1 0.1 10 10 100 100K 10K Slope Resistance v Current Slope Resistance v Frequency VIN (V) VIN (V) 1K Frequency (kHz) 10 10 0 0 IR=5mA 2 IR=5mA 3 IR=150A 2 1 IR=150A 1 VR (V) VR (V) 100 Reference Current (mA) 0 0 4 8 12 0 0 16 4 8 12 16 Time (s) Time (s) Transient Response - Single pulse Transient Response - Repetitive Test 4-249 ZRC250 CONNECTION DIAGRAMS E-Line, 3 pin Package Suffix - A SOT23 Package Suffix - F Bottom View - Pin 1 floating or connected to pin 3 Top View - Pin 1 floating or connected to pin 2 4-250 ZRC250 ORDERING INFORMATION Part No Tol% Package Partmark ZRC250A03 3 E-Line * ZRC25003 ZRC250A02 2 E-Line * ZRC25002 ZRC250A01 1 E-Line * ZRC25001 ZRC250F03 3 SOT23 25G ZRC250F02 2 SOT23 25H ZRC250F01 1 SOT23 25J * E-Line 3 pin 4-251