AMG-PU005 Datasheet, PDF (11/14 Pages) alpha microelectronics gmbh – Analog System Base Chip, I/O PowerStage, OP-Amps

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:
- Buck regulator: VDROPB=2V (to be adjusted by external resistor divider)
- Linear regulator: VDROPL=1V (in case of saturation, VVL≤6V).
Thus none or one or both regulators may be used (see operational voltage range limitations).
VDD
VL
5V Linear Reg.
FB
LX
Buck Reg.
Surge
Prot.
VS
VP
a) Supply concept using buck
and linear regulator
VDD
VL
5V Linear Reg.
FB
LX
Buck Reg.
Surge
Prot.
VS
VP
b) Supply concept using buck
only
VDD
VL
5V Linear Reg.
FB
LX
Buck Reg.
Surge
Prot.
VS
VP
c) Supply concept using linear
regulator only
VDD
VL
5V Linear Reg.
FB
LX
Buck Reg.
Surge
Prot.
VS
VP
d) Supply concept using neither
buck nor linear regulator (5V
external supply
Figure 4: Different supply concepts overview
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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