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REF3333AIDCKRG4 Datasheet(PDF) 8 Page - Texas Instruments |
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REF3333AIDCKRG4 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 18 page www.ti.com APPLICATIONS INFORMATION SUPPLY VOLTAGE START-UP TIME V IN REF33xx GND V OUT 1.2V Bandgap BASIC CONNECTIONS REF33xx V IN V OUT V OUT V IN C BYPASS 1 Fto10 F (recommended) m m C L 0.1 Fto10 F m m GND Time(400 s/div) m V IN 0.1 F m 1 F m 10 F m TEMPERATURE DRIFT Drift= V V - OUTMAX OUTMIN V TempRange ´ OUT ´ 10 (ppm) 6 (1) REF3312,, REF3318 REF3320, REF3325 REF3330, REF3333 SBOS392A – AUGUST 2007 – REVISED SEPTEMBER 2007 The REF33xx is a family of low-power, precision bandgap voltage references that are specifically The REF33xx family of voltage references features designed for excellent initial voltage accuracy with a extremely low dropout voltage, except for the high output current. Figure 17 shows a simplified REF3312. The REF3312 has a minimum supply block diagram of the REF33xx. requirement of 1.8V. These references can be operated with a supply 110mV above the output voltage with a 5mA load (typical). For loaded conditions, a typical dropout voltage versus load graph is illustrated in Figure 4 of the Typical Characteristics. If the supply voltage connected to the IN pin is rapidly moved while the REF33xx is connected to a capacitive load, a reverse voltage may discharge through the OUT pin and into the REF33xx device. This voltage will not damage the REF33xx, provided that it is less than or equal to 5V. The REF33xx features an advanced start-up circuit. Start-up time is almost independent of load (with a Figure 17. REF33xx Simplified Block Diagram 0.1 μF to 10μF load). Upon start-up, the current boost circuit forces the output voltage. When the preset voltage is reached, the REF33xx switches to the second stage of output circuitry to precisely set the output voltage. Figure 19 shows the start-up time of Figure 18 shows the typical connections for the the REF3325 for three different capacitive loads. In REF33xx. A recommended supply bypass capacitor all three cases, the output voltage settles within 2ms. ranging between 1 μF to 10μF is recommended. The total capacitive load at the output must be between 0.1 μF to 10μF to ensure output stability. Figure 18. Basic Connections Figure 19. Start-Up Time The REF33xx is designed for minimal drift error, defined as the change in output voltage over temperature. The drift is calculated using the box method, as described in Equation 1: 8 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): REF3312 REF3318 REF3320 REF3325 REF3330 REF3333 |
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