AMG-PU005

Analog System Base Chip, I/O PowerStage, OP-Amps

8.4. Application Notes

8.4.1. Supply concepts

The AMG-PU005 can be used with different supply strategies and ranges. It contains a buck

regulator and a linear regulator. The minimum voltage drops of the regulators to be considered

are:

Thus none or one or both regulators may be used (see operational voltage range limitations).

The buck regulator is able to drive about 40mA external load in total. If it has to supply the

linear regulator the maximum external load current will be reduced by the load of the linear

regulator (max. 20mA).

The buck regulator's external coil should be larger than 220uH.

AMG-PU005

Revision: B

9. Nov. 2012

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Page 11 of 14

Figure 4: Different supply concepts overview

Surge

Prot.

VP

Buck Reg.

5V Linear Reg.

VDD

FB

LX

VS

VL

Surge

Prot.

VP

Buck Reg.

5V Linear Reg.

VDD

FB

LX

VS

VL

Buck Reg.

5V Linear Reg.

VDD

FB

LX

VS

VL

Surge

Prot.

VP

Buck Reg.

5V Linear Reg.

VDD

FB

LX

VS

VL

Surge

Prot.

VP

a) Supply concept using buck

and linear regulator

b) Supply concept using buck

only

c) Supply concept using linear

regulator only

d) Supply concept using neither

buck nor linear regulator (5V

external supply