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MIC37151-3.3WR Datasheet(PDF) 10 Page - Micrel Semiconductor |
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MIC37151-3.3WR Datasheet(HTML) 10 Page - Micrel Semiconductor |
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10 / 13 page  Micrel, Inc. MIC37150/51/52/53 October 2007 10 M9999-101907 load current variations and input voltage variations. Large output capacitors are not required to obtain this performance. A standard 10µF output capacitor, preferably tantalum, is all that is required. Larger values help to improve performance even further. By virtue of its low dropout voltage, this device does not saturate into dropout as readily as similar NPN-based designs. When converting from 3.3V to 2.5V, 2.5V to 1.8V or 1.65V, or 2.5V to 1.5V, the NPN-based regulators are already operating in dropout, with typical dropout requirements of 1.2V or greater. To convert down to 2.5V without operating in dropout, NPN-based regulators require an input voltage of 3.7V at the very least. The MIC37150/51/52/53 regulator will provide excellent performance with an input as low as 3.0V or 2.25V, respectively. This gives the PNP-based regulators a distinct advantage over older, NPN-based linear regulators. Minimum Load Current The MIC37150/51/52/53 regulator is specified between finite loads. If the output current is too small, leakage currents dominate and the output voltage rises. A 10mA minimum load current is necessary for proper operation. Error Flag The MIC37151 and MIC37153 feature an error flag circuit that monitors the output voltage and signals an error condition when the voltage 5% below the nominal output voltage. The error flag is an open-collector output that can sink 10mA during a fault condition. Low output voltage can be caused by a number of problems, including an overcurrent fault (device in current limit) or low input voltage. The flag is inoperative during overtemperature shutdown. Enable Input The MIC37151/37152/37153 also features an enable input for on/off control of the device. Its shutdown state draws “zero” current (only microamperes of leakage). The enable input is TTL/CMOS compatible for simple logic interface, but can be connected to up to VIN. When enabled, it draws approximately 15µA. Adjustable Regulator Design IN R1 VOUT VIN COUT R2 EN OUT ADJ GND MIC37152 ENABLE SHUTDOWN VOUT = 1.240V (1 + ) R1 R2 Figure 1. Adjustable Regulator with Resistors The MIC37152 and MIC37153 allow programming the output voltage anywhere between 1.24V and the 5.5V 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: ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − = 1 1.240 V R2 R1 OUT Where VOUT is the desired output voltage. Figure 1 shows component definition. Applications with widely varying load currents may scale the resistors to draw the minimum load current required for proper operation (see above). |
Similar Part No. - MIC37151-3.3WR |
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Similar Description - MIC37151-3.3WR |
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