LTC1798CS8-2.5-TRPBF 데이터 시트보기 (PDF) - Linear Technology
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LTC1798CS8-2.5-TRPBF Datasheet PDF : 10 Pages
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LTC1798 Series
APPLICATIONS INFORMATION
to reduce the output ringing. Figure 2 illustrates the use of
a damping resistor for capacitive loads greater than 1µF.
Figure 3 shows the resistor and capacitor values required
to achieve critical damping.
Internal P-Channel Pass Transistor
The LTC1798 series features an internal P-channel MOSFET
pass transistor. This provides several advantages over
similar designs using a PNP bipolar pass transistor.
These references consume only 4µA of quiescent current
under light and heavy loads as well as in dropout; whereas,
PNP-based references waste considerable amounts of cur-
rent when the pass transistor is saturated. In addition, the
LTC1798 series provides a lower dropout voltage (200mV
max) than PNP-based references.
10k
5.2V
TO
12.6V
0.1µF
LTC1798-5
2
IN
6
OUT
GND
4
5V
COUT
>1µF
DAMPING RESISTOR
<1k
1798 F02
Figure 2. Adding a Damping Resistor with
Output Capacitors Greater Than 1µF
1k
100
10
1
10
100
1000
OUTPUT CAPACITOR VALUE (µF)
1798 F03
Figure 3. Damping Resistance vs Output Capacitor Value
1798fc
7
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