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MIC37501-1.65WR Datasheet(PDF) 9 Page - Micrel Semiconductor |
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MIC37501-1.65WR Datasheet(HTML) 9 Page - Micrel Semiconductor |
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9 / 11 page  Micrel, Inc. MIC37501/37502 February 2007 9 M9999-020507 that is required. Larger values help to improve performance even further. Enable Input The MIC37501/02 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 up to VIN. When enabled, it draws approximately 15µA. 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 at least 3.7V. The MIC37501/02 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. Adjustable Regulator Design IN R1 VOUT VIN COUT R2 EN OUT ADJ GND MIC37502 ENABLE SHUTDOWN V 1.240V 1 R1 R2 OUT =+ ⎛ ⎝⎜ ⎞ ⎠⎟ Minimum Load Current The MIC37501/02 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. Figure 2. Adjustable Regulator with Resistors Error Flag The MIC37502 allows 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 MIC37501 features an error flag circuit that monitors the output voltage and signals an error condition when the voltage drops 5% below the nominal output voltage. The error flag is an open- collector output that can sink 10mA during a fault condition. The resistor values are calculated by: 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. ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − = 1 1.240 V R2 R1 OUT Where VOUT is the desired output voltage. Figure 2 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). |
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