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XC9510 Datasheet(PDF) 13 Page - Torex Semiconductor

No. de Pieza. XC9510
Descripción  Synchronous Step-Down DC/DC Converter With Built-In LDO Regulator Plus Voltage Detector
Descarga  36 Pages
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Fabricante  TOREX [Torex Semiconductor]
Página de inicio  http://www.torex.co.jp
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XC9510 Datasheet(HTML) 13 Page - Torex Semiconductor

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1363
XC9510
Series
OPERATIONAL EXPLANATION (Continued)
Voltage Detector
The detector block of the XC9510 series detects output voltage from the VDOUT pin while sensing either VDD, DCOUT, or
VROUT internally. (N-channel Open Drain Type)
< 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
only in the detector and is 3.0μA (TYP.), with a state of high impedance at the Lx pin and DCOUT pin. The IC starts its
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.
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.
2. Spike noise and ripple voltage arise in a switching regulator as with a DC/DC converter. These are greatly influenced by external
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.
3. When the difference between VIN and VOUT is large in PWM control, very narrow pulses will be outputted, and there
is the possibility that some cycles may be skipped completely.
4. When the difference between VIN and VOUT is small, and the load current is heavy, very wide pulses will be outputted
and there is the possibility that some cycles may be skipped completely: in this case, the Lx pin may not go low at all.
NOTES ON USE
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)


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