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NCP133AMX125TCG Datasheet(PDF) 7 Page - ON Semiconductor |
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NCP133AMX125TCG Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 9 page NCP133 www.onsemi.com 7 APPLICATIONS INFORMATION IN EN FB LX GND Processor I/O BIAS IN OUT GND NCP133 LOAD VBAT 1.5 V 1.0 V To other circuits I/O EN Figure 12. Typical Application: Low−Voltage DC/DC Post−Regulator with ON/OFF Functionality Switch−mode DC/DC VOUT = 1.5 V The NCP133 dual−rail very low dropout voltage regulator is using NMOS pass transistor for output voltage regulation from VIN voltage. All the low current internal control circuitry is powered from the VBIAS voltage. The use of an NMOS pass transistor offers several advantages in applications. Unlike PMOS topology devices, the output capacitor has reduced impact on loop stability. Vin to Vout operating voltage difference can be very low compared with standard PMOS regulators in very low Vin applications. The NCP133 offers smooth monotonic start-up. The controlled voltage rising limits the inrush current. The Enable (EN) input is equipped with internal hysteresis. NCP133 Voltage linear regulator Fixed and Adjustable version is available. Output Voltage Adjust The required output voltage of Adjustable devices can be adjusted from 0.8 V to 3.6 V using two external resistors. Typical application schematics is shown in Figure 13. BIAS IN OUT GND CBIAS 2.2 μF CIN NCP133 ADJ VBIAS VIN EN VEN VOUT ADJ R1 R2 Figure 13. Typical Application Schematics V OUT + 0.8 1 ) R1 R2 It is recommended to keep the total serial resistance of resistors (R1 + R2) no greater than 100 k W. Recommended resistor values for programming the frequently used voltages can be found in the Table 1. Dropout Voltage Because of two power supply inputs VIN and VBIAS and one VOUT regulator output, there are two Dropout voltages specified. The first, the VIN Dropout voltage is the voltage difference (VIN – VOUT) when VOUT starts to decrease by percent specified in the Electrical Characteristics table. VBIAS is high enough; specific value is published in the Electrical Characteristics table. The second, VBIAS dropout voltage is the voltage difference (VBIAS – VOUT) when VIN and VBIAS pins are joined together and VOUT starts to decrease. Input and Output Capacitors The device is designed to be stable for ceramic output capacitors with Effective capacitance in the range from 2.2 mF to 10 mF. The device is also stable with multiple capacitors in parallel, having the total effective capacitance in the specified range. In applications where no low input supplies impedance available (PCB inductance in VIN and/or VBIAS inputs as example), the recommended CIN = 1 mF and CBIAS = 0.1 mF or greater. Ceramic capacitors are recommended. For the best performance all the capacitors should be connected to the NCP133 respective pins directly in the device PCB copper layer, not through vias having not negligible impedance. When using small ceramic capacitor, their capacitance is not constant but varies with applied DC biasing voltage, temperature and tolerance. The effective capacitance can be much lower than their nominal capacitance value, most importantly in negative temperatures and higher LDO output voltages. That is why the recommended Output capacitor capacitance value is specified as Effective value in the specific application conditions. |
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