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RT9204 Datasheet(PDF) 10 Page - Richtek Technology Corporation |
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RT9204 Datasheet(HTML) 10 Page - Richtek Technology Corporation |
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10 / 14 page  RT9204/A Preliminary 10 DS9204/A-08 March 2007 www.richtek.com Inductor Selection The RT9204/A was designed for VIN = 5V, step-down application mainly. Figure 6 shows the typical topology and waveforms of step-down converter. The ripple current of inductor can be calculated as follows: Because operation frequency is fixed at 600kHz, The VOUT ripple is ESR is COUT capacitor equivalent series resistor Table 1 shows the ripple voltage of VOUT: VIN = 5V *Refer to Sanyo low ESR series (CE, DX, PX......) The suggested L and C are as follows: 2 µH with ≥ 1500µF COUT 5 µH with ≥ 1000µF COUT Figure 5 Shutdown Pulling high the SD pin by a small single transistor can shutdown the RT9204/A PWM controller as shown in typical application circuit. Normally SD pin can be floating because an internal 40 µA current source will pull low the SD shutdown pin voltage. VOUT 3.3V 2.5V 1.5V Inductor 2 µH 5 µH 2 µH 5 µH 2 µH 5 µH 1000 µF (ESR = 53mΩ) 100mV 40mV 110mV 44mV 93mV 37mV 1500 µF (ESR = 33mΩ) 62mV 25mV 68mV 28mV 58mV 23mV 3000 µF (ESR = 21mΩ) 40mV 16mV 43mV 18mV 37mV 15mV 0V 2V 4V T0T1 T2 T3 TIME COUNT = 1 COUNT = 2 COUNT = 3 OVERLOAD APPLIED Figure 6 I D i D i Q I Q uQ uI L i L I L = I O V L V I - V O - V O T S T ON T OFF Table 1 V I V O R C D L Q C.C.M. × OUT RIPPLE ON (5V - V) IL =T L × OUT ON V T = 3.33 5V × OUT RIPPLE RIPPLE V = IL ESR |
Similar Part No. - RT9204_07 |
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Similar Description - RT9204_07 |
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