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XC9802B50253KR Datasheet(PDF) 3 Page - Torex Semiconductor |
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XC9802B50253KR Datasheet(HTML) 3 Page - Torex Semiconductor |
3 / 12 page 3/12 XC9801/XC9802 Series PARAMETER SYMBOL CONDITIONS UNITS VIN pin Voltage VIN −0.3∼6.0 V VOUT pin Voltage VOUT −0.3∼12.0 V C1 + pin Voltage C1+ −0.3∼VOUT+0.3 V C1 - pin Voltage C1- −0.3∼VOUT+0.3 V CE pin Voltage VCE −0.3∼VIN+0.3 V VOUT Pin Output Current IOUT 200 mA MSOP-8A 150 Power Dissipation USP-8 Pd 120 mW Operating Temperature Range Topr −40∼+85 ℃ Storage Temperature Range Tstg −40∼+125 ℃ ■BLOCK DIAGRAM ■ABSOLUTE MAXIMUM RATINGS Ta = 25 ℃, GND = 0V (1) Basic Operations (2) Stand-by Function Using the XC9801/02 ’s clock generated by the internal oscillator, a step-up charge pump operation can be brought about as a result of the alternate switching between operating conditions where P1 & N4 are ON with P2 & P3 OFF (or) P1 & N4 are OFF with P2 & P3 ON. By connecting the SENSE pin to VOUT, output voltage can be feedback and the difference between the feedback voltage and the reference voltage (Vref) are compared by the internal operational amplifier. Output voltage can be stabilized (* 2) by controlling P3 ’s gate voltage waveform via the signal generated by the internal amplifier. Please note that this stabilizing function will not operate with VIN < (VOUT/2) or VIN ≧ VOUT. By connecting SENSE to ground, the output stability function, as described above, can be halted and the IC can be used as a step-up doubler. * 2 : As a result of P3 gradually reaching an ON state with each clock (signal), rush current is controlled, the ripple decreases and with the combination of the independent phase compensation circuit, output voltage is stabilized When the voltage at CE (chip enable) is ‘low’ (0V), P1, P2 & P3 will be OFF with N4 & N5 ON. The external capacitor C1 will discharge and impedance at VOUT will be high. (3) PFM (Pulse Skip) Operations Whilst maintaining output voltage, the XC9802 provides the added security of protection against drops in efficiency during light loads as a result of the pulse, generated by the internal oscillator, being skipped and the operating frequency being changed. Controller |
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