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XC9510

Series

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OPERATIONAL EXPLANATION (Continued)

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Voltage Detector

< CE / MODE Pin Function>

The operation of the XC9510 series' DC/DC converter block and voltage regulator block will enter into the shut down

mode when a low level signal is input to the CE/MODE pin. During the shut down mode, the current consumption occurs

operation by inputting a high level signal or a middle level signal to the CE/MODE pin. The input to the CE/MODE pin is

a CMOS input and the sink current is 0μA (TYP.). The operation of the XC9510D to F series' voltage detector block will

enter into stand-by mode when a high level signal is input to the CE/MODE pin. The voltage regulator block will operate

when a middle level signal is input. But when a low level signal is input, the voltage regulator block will enter into

stand-by mode. With the XC9510H to L series control can be PWM control when the CE/MODE pin is 'M' level and

PWM/PFM automatic switching control when the CE/MODE pin is 'H' level.

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Application Information

1. The XC9510 series is designed for use with ceramic output capacitors. If, however, the potential difference between

dropout voltage or output current is too large, a ceramic capacitor may fail to absorb the resulting high switching

energy and oscillation could occur on the output. If the input-output potential difference is large, connect an

electrolytic capacitor in parallel to compensate for insufficient capacitance.

component selection, such as the coil inductance, capacitance values, and board layout of external components. Once the design

has been completed, verification with actual components should be done.

is the possibility that some cycles may be skipped completely.

and there is the possibility that some cycles may be skipped completely: in this case, the Lx pin may not go low at all.

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NOTES ON USE

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DC/DC Waveform (3.3V, 1.2MHz)

< External Components>

L:4.7μH(CDRH4D28C,SUMIDA)

CIN:4.7μF(ceramic)

CL:10μF(ceramic)

< External Components>

L:4.7μH(CDRH4D28C,SUMIDA)

CIN:4.7μF(ceramic)

CL:10μF(ceramic)