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R1140Q151D Datasheet(PDF) 6 Page - RICOH electronics devices division |
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R1140Q151D Datasheet(HTML) 6 Page - RICOH electronics devices division |
6 / 18 page R1140Q 5 • ELECTRICAL CHARACTERISTICS by OUTPUT VOLTAGE Topt = 25°C Dropout Voltage VDIF (V) Output Voltage VOUT (V) Condition TYP. MAX. 1.5 ≤ VOUT ≤ 1.6 0.36 0.70 1.7 ≤ VOUT ≤ 1.8 0.30 0.50 1.9 ≤ VOUT ≤ 2.0 0.28 0.45 2.1 ≤ VOUT ≤ 2.7 0.24 0.40 2.8 ≤ VOUT ≤ 4.0 IOUT = 120mA 0.18 0.30 TECHNICAL NOTES When using these ICs, consider the following points: Phase Compensation In these ICs, phase compensation is made for securing stable operation even if the load current is varied. For this purpose, be sure to use a 2.2µF or more capacitor COUT with good frequency characteristics and ESR (Equivalent Se- ries Resistance). (Note: When the additional ceramic capacitors are connected to the Output Pin with Output capacitor for phase com- pensation, the operation might be unstable. Because of this, test these ICs with as same external components as ones to be used on the PCB.) PCB Layout Make VDD and GND line sufficient. When the impedance of these is high, it would be a cause of picking up the noise or unstable operation. Connect a capacitor with as much as 1.0µF capacitor between VDD and GND pin as close as pos- sible. Set external components, especially output capacitor as close as possible to the ICs and make wiring shortest. |
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