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REF3230AMDBVREPG4 Datasheet(PDF) 11 Page - Texas Instruments |
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REF3230AMDBVREPG4 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 25 page 1 2 3 6 5 4 +2.5V 0.47 F µ +5V 110 108 106 104 102 100 98 96 94 1.5 2.0 3.0 4.0 2.5 3.5 4.5 6.0 5.0 5.5 Power Supply (V) REF3212-EP, REF3220-EP, REF3225-EP REF3230-EP, REF3233-EP, REF3240-EP www.ti.com SBVS078B – OCTOBER 2006 – REVISED AUGUST 2011 APPLICATION INFORMATION The REF32xx does not require a load capacitor and is stable with most capacitive loads, see Load Capacitance Guidelines. Figure 4 shows typical connections required for operation of the REF32xx. A supply bypass capacitor of 0.47 μF is recommended. Figure 4. Typical Operating Connections for the REF3225 Supply Voltage The REF32xx family of references features an extremely low dropout voltage. With the exception of the REF3212, which has a minimum supply requirement of 1.8 V, these references can be operated with a supply of only 5 mV above the output voltage in an unloaded condition. For loaded conditions, a typical dropout voltage versus load is shown in the Typical Characteristic curves. The REF32xx also features a low quiescent current of 100 μA, with a maximum quiescent current over temperature of just 135 μA. The quiescent current typically changes less than 2 μA over the entire supply range, as shown in Figure 5. Figure 5. Supply Current vs Supply Voltage Supply voltages below the specified levels can cause the REF32xx to momentarily draw currents greater than the typical quiescent current. This momentary current draw can be prevented by using a power supply with a fast rising edge and low output impedance. For optimal startup when the IN pin and ENABLE pin are tied together, keep the input voltage rise time less than or equal to 2ms. For rise times greater than 2ms, the ENABLE pin must be kept below 0.7V until the voltage at the IN pin has reached the minimum operating voltage. One way to control the voltage at the ENABLE pin is with an additional RC filter, such as that shown in Figure 6. The RC filter must hold the voltage at the ENABLE pin below the threshold voltage until the voltage at the input pin has reached the minimum operating voltage. Copyright © 2006–2011, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): REF3212-EP, REF3220-EP, REF3225-EP REF3230-EP, REF3233-EP, REF3240-EP |
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