The LA9472A is a 2A monolithic step down switching regulator operating in continuous mode and realized in a new BCD technology allowing the integration of isolated, vertical DMOS power transistors with mixed CMOS/bipolar transistors. The device can deliver 2A at an output voltage adjustable from 5.1V to 40V … Link
When i want 5V switching regulator (mini project),so i am used input is 9V battery.
The good circuit for work is the IC LT1073-5 (see detail in www.linear.com), it out put 100mA current.
The zener diode is 1N5818,L1 = 100uH
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Portable iPod charger that you can use while away from your computer. The circuit is based around an MC34063 switchmode regulator. This has high efficiency so that there is very little heat produced inside the box, even when delivering its maximum output current. The circuit is more complicated than if we used a 7805 3-terminal [...]
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