377
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).
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Applications
Personal computers, CD-ROM players, portable information devices, and other PCMCIA-slot equipped devices
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Features
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 con-
centrated on one side.
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Absolute maximum ratings
379
Regulator ICs
BP5310
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Pin descriptions
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Application examples
(1)
Flash memory that requires 5V for reading
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Operation notes
(1)
Place I / O external capacitors as near as possible
to the connection pins. In particular, make sure to mini-
mize 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 35
m thickness.)
(2)
Avoid frequent switching using the ON / OFF CTL
pin (five times per second at the maximum).
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External dimensions (Units: mm)
380
Regulator ICs
BP5310
(2)
Pull-down of V
PP
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 out-
put capacitor, we recommend considering the capaci-
tance within the IC card and making the output voltage
to reach 8V or more in less than 20ms.
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