MC33375_13 Datasheet, PDF (9/13 Pages) ON Semiconductor – 300 mA, Low Dropout Voltage Regulator with On/Off Control

V_in
C_in
MC33375, NCV33375 Series
V_CC = 3 V
I_LOAD = 1 mA to 100 mA
T_A = 25°C
1.82 V
1.80 V
1.78 V
100 mA
1 mA
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
t, TIME (ms)
Figure 22. Load Transient Response
APPLICATIONS INFORMATION
ON/OFF
V_out
MC33375−xx
C_out
LOAD
GND
Figure 23. Typical Application Circuit
The MC33375 regulators are designed with internal
current limiting and thermal shutdown making them
user−friendly. Figure 15 is a typical application circuit. The
output capability of the regulator is in excess of 300 mA,
with a typical dropout voltage of less than 260 mV. Internal
protective features include current and thermal limiting.
EXTERNAL CAPACITORS
These regulators require only a 0.33 mF (or greater)
capacitance between the output and ground for stability for
1.8 V, 2.5 V, 3.0 V, and 3.3 V output voltage options. Output
voltage options of 5.0 V require only 0.22 mF for stability.
The output capacitor must be mounted as close as possible
to the MC33375. If the output capacitor must be mounted
further than two centimeters away from the MC33375, then
a larger value of output capacitor may be required for
stability. A value of 0.68 mF or larger is recommended. Most
type of aluminum, tantalum, or multilayer ceramic will
perform adequately. Solid tantalums or appropriate
multilayer ceramic capacitors are recommended for
operation below 25°C. An input bypass capacitor is
recommended to improve transient response or if the
regulator is connected to the supply input filter with long
wire lengths, more than 4 inches. This will reduce the
circuit’s sensitivity to the input line impedance at high
frequencies. A 0.33 mF or larger tantalum, mylar, ceramic,
or other capacitor having low internal impedance at high
frequencies should be chosen. The bypass capacitor should
be mounted with shortest possible lead or track length
directly across the regulator’s input terminals. Figure 16
shows the ESR that allows the LDO to remain stable for
various load currents.
100
V_out = 3.0 V
C_out = 1.0 mF
C_in = 1.0 mF
10
Stable Region
1.0
0.1
0
50
100
150
200
250
300
LOAD CURRENT (mA)
Figure 24. ESR for V_out = 3.0V
Applications should be tested over all operating
conditions to insure stability.
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