LTC1798CS8-2.5-TRPBF データシートの表示（PDF） - Linear Technology
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LTC1798CS8-2.5-TRPBF Datasheet PDF : 10 Pages
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TYPICAL PERFORMANCE CHARACTERISTICS
LTC1798 Series
LTC1798-2.5
0.1Hz to 10Hz Noise
VIN = 2.7V
5µV/DIV
1SEC/DIV
1798 G10
LTC1798-5 Input Current
vs Input Voltage in Dropout
1400
1200
1000
800
TA = –55°C
TA = 25°C
TA = 125°C
600
400
200
0
0 1 2 3 4 5 6 7 8 9 10
INPUT VOLTAGE (V)
1798 G11
LTC1798-2.5 Input Current
vs Input Voltage in Dropout
250
200
TA = 125°C
150
TA = 25°C
100
TA = –55°C
50
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
INPUT VOLTAGE (V)
1798 G12
PIN FUNCTIONS
DNC (Pins 1, 5, 7, 8): Do Not Connect. Connected
internally for post package trim. These pins must be left
unconnected.
IN (Pin 2): Positive Supply. Bypassing with a 0.1µF capaci-
tor is recommended if the output loading changes. (VOUT
+ 0.2V) ≤ VIN ≤ 12.6V.
DNC (Pin 3): (LTC1798-2.5/LTC1798-3/LTC1798-4.1/
LTC1798-5) Do Not Connect. Connected internally for post
package trim. This pin must be left unconnected.
FB (Pin 3): (LTC1798) Resistor Divider Feedback Pin.
Connect a resistor divider from OUT to GND and the center
tap to FB. This pin sets the output potential.
VOUT = 2.385V R1R+2R2; R1 is connected from OUT
to FB and R2 from FB to GND. Selecting R2 ≥ 10k will
make IOUT < 250µA.
GND (Pin 4): Negative Supply or Ground Connection.
OUT (Pin 6): Reference Output. The output can source
up to 10mA and sink up to 2mA. It is stable with output
bypass capacitor ranging from 0µF to 1µF.
1798fc
5
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