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| Regulator ICs PCMCIA / flash memory power supply BP5310 The BP5310 is a DC / DC converter for supplying power to PCMCIA flash memory. From a power supply ()5V) for PCMCIA operations, the IC supplies a voltage for programming operations ()12V). FApplications Personal computers, CD-ROM players, portable information devices, and other PCMCIA-slot equipped devices FFeatures 1) Designed to provide power for PCMCIA / flash memory programming operations (output voltage = 12V 5%; output current = 120mA) 2) The 5V operating voltage is same as the IC memory card operating voltage. 3) Built-in short-circuit protection circuit. 4) Compact 9-pin SIL package. 5) Surface mounting is possible because parts are concentrated on one side. FAbsolute maximum ratings 377 Regulator ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCTL = 5V) BP5310 FMeasurement circuit 378 Regulator ICs FPin descriptions BP5310 FApplication examples (1) Flash memory that requires 5V for reading FOperation notes (1) Place I / O external capacitors as near as possible to the connection pins. In particular, make sure to minimize the impedance between the input-side capacitor (C1) and pin 9. (Reference value: A length less than 50mm for a copper foil of 1.0mm wide and 35m thickness.) (2) Avoid frequent switching using the ON / OFF CTL pin (five times per second at the maximum). 379 Regulator ICs (2) Pull-down of VP-P BP5310 The OFF output is pulled down through an effective resistance of 30k. (3) The module has a built-in short-circuit protection circuit. Short-circuiting is assumed if the output voltage does not reach 4.2V (typical) in 40ms (typical), and the protection circuit starts to operate. When setting the outFExternal dimensions (Units: mm) put capacitor, we recommend considering the capacitance within the IC card and making the output voltage to reach 8V or more in less than 20ms. 380 |
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