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MIC29310-5.0WU Datasheet(PDF) 8 Page - Micrel Semiconductor |
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MIC29310-5.0WU Datasheet(HTML) 8 Page - Micrel Semiconductor |
8 / 12 page MIC29310/29312 Micrel MIC29310/29312 8 November 2006 and the output voltage rises. A 10mA minimum load current is necessary for proper regulation. Adjustable Regulator Design Figure 4. Adjustable Regulator with Resistors The adjustable regulator version, MIC29312, allows program- ming the output voltage anywhere between 1.25V and the 15V maximum operating rating of the family. Two resistors are used. Resistors can be quite large, up to 1MΩ, because of the very high input impedance and low bias current of the sense comparator. The resistor values are calculated by: VOUT R1 = R2 × ( –—— – 1 ) 1.240 Where VO is the desired output voltage. Figure 4 shows component definition. Applications with widely varying load currents may scale the resistors to draw the minimum load current required for proper operation (see the table below). Enable Input The MIC29312 version features an enable (EN) input that allows ON/OFF control of the device. Special design al- lows “zero” current drain when the device is disabled—only microamperes of leakage current flows. The EN input has TTL/CMOS compatible thresholds for simple interfacing with logic, or may be directly tied to VIN. Enabling the regulator requires approximately 20µA of current into the EN pin. Voltage Standard (Ω) Min. Load (Ω) R1 R2 R1 R2 2.85 100k 76.8k 162 124 2.9 100k 75.0k 165 124 3.0 100k 69.8k 174 124 3.1 100k 66.5k 187 124 3.15 100k 64.9k 191 124 3.3 100k 60.4k 205 124 3.45 100k 56.2k 221 124 3.6 100k 52.3k 237 124 3.8 100k 48.7k 255 124 4.0 100k 45.3k 274 124 4.1 100k 43.2k 287 124 Resistor Value Table for the MIC29312 Adjustable Regulator Note: This regulator has a minimum load requirement. “Standard” values assume the load meets this requirement. “Minimum Load” values are calculated to draw 10mA and allow regulation with an open load (the minimum current drawn from the load may be zero). |
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