Charger Power Supply (Cps) Reference Designs; Disclaimer; Dc/Dc Version - Wavecom GX64 Application Note

3

Charger Power Supply (CPS) Reference Designs

3.1

Disclaimer

Wavecom Inc is not responsible for the charger power supplies reference design. The
integrator should refer technical questions regarding the charger power supplies
listed below directly to National Semiconductors.
3.1

DC/DC version

The implementation shown in Appendix B is the reference design of a 5V DC/DC buck
regulator from National Semiconductors. The input voltage can be between 6VDC to
20VDC. For more information on the design please contact National Semiconductors.
This DC/DC power supply does not include a current limiter.
required to implement a 500mA current limiter, such as the Maxim MAX890L, before
applying this voltage to CHG_IN. It should be noted that if the Maxim MAX890L is
used as current limiter, the supply voltage must be limited to 5V ±10% since the
upper limit operating voltage for the Maxim part is 5.5V.
Bill Of Material:
Gx64 APPLICATION NOTE
Charging Interface
Page: 14/20
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The application is