LTC1165 查看數據表（PDF） - Linear Technology
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LTC1165 Datasheet PDF : 8 Pages
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LTC1163/LTC1165
UU W U
APPLICATIO S I FOR ATIO
VIN LT1129-3.3
3.3V
+
3.3µF
ON/OFF
R1
VS
100k
OUT1
1/3 LTC1163
IN1
GND
R2
1k
C1
0.1µF
MTD3055EL
+
CL
3.3V
100µF LOAD
LTC1163/65 • F01
Figure 1. Powering a Large Capacitive Load
managed by the system regulator. R2 is required to
eliminate the possibility of parasitic MOSFET oscillations
during switch transitions. It is a good practice to isolate the
gates of paralleled MOSFETs with 1k resistors to decrease
the possibility of interaction between switches.
Mixed 5V/3V Systems
Because the input ESD protection diodes are referenced to
ground instead of the supply pin, it is possible to drive the
LTC1163/LTC1165 inputs from 5V CMOS or TTL logic
even though the LTC1163/LTC1165 are powered from a
3.3V supply as shown in Figure 2. The input threshold
voltage is approximately 50% of the supply voltage or 1.6V
on a 3.3V supply which is compatible with 5V TTL and
CMOS logic. (The LTC1163/LTC1165 cannot however, be
driven by 3V logic when powered from a 5V supply
because the threshold is approximately 2.5V.)
3.3V
5V
VS
OUT1
1/3 LTC1163
IN1
GND
MTD3055EL
3.3V
LOAD
LTC1163/65 • F01
Figure 2. Direct Interface to 5V Logic
Reverse Battery Protection
The LTC1163/LTC1165 can be protected against reverse
battery conditions by connecting a 150Ω resistor in series
with the ground pin or supply pin. The resistor limits the
supply current to less than 24mA with –3.6V applied.
Because the LTC1163/LTC1165 draw very little current
while in normal operation, the drop across the resistor is
minimal. The 3.3V µP (or control logic) can be protected by
adding 10k resistors in series with the input pins.
U
TYPICAL APPLICATIO S
PCMCIA Card 3.3V/5V VCC Switch
5V +
PCMCIA
CONTROLLER
10µF
VCC 5V
VS
IN1
OUT1
LTC1165
VCC 3V
IN2
OUT2
IN3
OUT3
GND
1/2 MMDF3N02HD
+
MMDF3N02HD
VCC
1µF
3.3V
NOTE: USE LTC1163 WITH NONINVERTING PCMCIA CONTROLLERS
PC
CARD
SOCKET
LTC1163/65 • TA03
6
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