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MIC29710-5.0BT Datasheet(PDF) 9 Page - Micrel Semiconductor |
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MIC29710-5.0BT Datasheet(HTML) 9 Page - Micrel Semiconductor |
9 / 11 page Micrel, Inc. MIC29710/29712 October 2006 9 M9999-101906 Adjustable Regulator Design The adjustable regulator version, MIC29712, allows pro- gramming the output voltage anywhere between 1.25V and the 16V maximum operating rating of the family. Two resistors are used. Resistors can be quite large, up to 100kΩ, because of the very high input impedance and low bias current of the sense comparator. The resistor values are calculated by: ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − × = 1 1.240 V R2 R1 OUT Where VO is the desired output voltage. Figure 4 shows component definition. R1 100k R2 56.2k VOUT = 1.240V× [1 + (R1 / R2)] VIN 4.75 to 5.25 VOUT 3.45V MIC29712BT 33µF 10µF Figure 4. Adjustable Regulator with Resistors Enable Input The MIC29712 versions features an enable (EN) input that allows ON/OFF control of the device. Special design allows “zero” current drain when the device is disabled— only micro-amperes 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. Minimum Load Current The MIC29710/12 regulators are specified between finite loads. If the output current is to small, leakage currents dominate and the output voltage rises. A 10mA minimum load current is necessary for proper regulation. Standard (Ω) Voltage R1 R2 2.85 100k 76.8k 2.9 100k 75.0k 3.0 100k 69.8k 3.1 100k 66.5k 3.15 100k 64.9k 3.3 100k 60.4k 3.45 100k 56.2k 3.525 93.1k 51.1k 3.6 100k 52.3k 3.8 100k 48.7k 4.0 100k 45.3k 4.1 100k 43.2k Figure 5. MIC29712 Resistor Table |
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