Microchip SOT-23-5/6 Device Compatibility
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-3 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).
SOT-23 Evaluation Board PCB
Power
Supply
LDO
C2
C L
R3
Test Point
From Function
Generator
Function
Generator
Output
Test
Point
FIGURE C-3:
? 2006 Microchip Technology Inc.
LDO Evaluation System.
DS51527B-page 39
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