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Voltage Supervisor SOT23 Evaluation Board User’s Guide
TABLE C-1:
MICROCHIP ANALOG DEVICES AND SOT23 EVAL BOARD
CIRCUIT/FOOTPRINT OPTION SELECTION
Device
MCP1700
Device Family
LDO
Supported
on
Option 2
Comment/
Recommended Component Values:
C1 = 1 μF Ceramic
C2 = 1 μF Ceramic
MCP1701
LDO
Option 2
C1 = 1 μF Tantalum
C2 = 1 μF Tantalum
MCP1525
Voltage Reference
Option 3
C1 = 0.1 μF
C2 = 1 μF to 10 μF
MCP1541
Voltage Reference
Option 3
C1 = 0.1 μF
C2 = 1 μF to 10 μF
TC59
LDO
Option 4
C1 = 1 μF Tantalum
C2 = 1 μF Tantalum
C.3
IDEAS ON EVALUATING AN LDO
One of the characteristics that a designer may wish to evaluate on a LDO is how the
LDO responds to transient loads. Figure C-2 shows a system block diagram for
evaluating a LDO and a typical waveform response (at test point) for the function
generator signal. The output of the function generator connects to a BJT transistor to
simulate the fast switching loads of the circuit.
The value of C2, R3 and C L will depend on the LDO used and the load of the circuit.
Look at both the worst-case amplitude load requirements for a loaded and unloaded
system. As the output response of the LDOs become faster, the selection of a smaller
(cheaper) output load capacitor (C L ) becomes possible (for the same system
performance).
FIGURE C-2:
LDO EVALUATION SYSTEM
SOT23 Evaluation Board PCB
Power
Supply
LDO
C2
C L
R3
Test Point
From Function
Generator
Function
Generator
Output
Test
Point
DS51510A-page 22
? 2004 Microchip Technology Inc.
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