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LT1933

1933fe

APPLICATIONS INFORMATION

Figure 1 shows the transient response of the LT1933 with

several output capacitor choices. The output is 3.3V. The

load current is stepped from 100mA to 400mA and back to

100mA, and the oscilloscope traces show the output volt-

age. The upper photo shows the recommended value. The

second photo shows the improved response (less voltage

drop) resulting from a larger output capacitor and a phase

lead capacitor. The last photo shows the response to a high

performance electrolytic capacitor. Transient performance

is improved due to the large output capacitance, but output

ripple (as shown by the broad trace) has increased because

of the higher ESR of this capacitor.

Figure 1. Transient Load Response of the LT1933 with Different

Output Capacitors as the Load Current is Stepped from 100mA

to 400mA. VIN = 12V, VOUT = 3.3V, L = 22μH.

22μF

16.5k

10k

VOUT

1933 F01a

VOUT

50mV/DIV

IOUT

200mA/DIV

VOUT

50mV/DIV

IOUT

200mA/DIV

VOUT

1933 F01b

16.5k

10k

22μF

470pF

VOUT

50mV/DIV

IOUT

200mA/DIV

SANYO

4TPB100M

1933 F01c

VOUT

16.5k

10k

100μF

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