LTC1470C 데이터 시트보기 (PDF) - Linear Technology
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LTC1470C Datasheet PDF : 12 Pages
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LTC1470/LTC1471
TYPICAL PERFORMANCE CHARACTERISTICS (LTC1470 or 1/2 LTC1471)
5V Switch Resistance
0.30
PROGRAMMED
0.25 TO 5V
0.20
0.15
0.10
0.05
0
0
25
50
75 100 125
JUNCTION TEMPERATURE (°C)
1470/71 G06
Inrush Current (3.3V Switch)
3
TJ = 25°C
2
1
COUT = 150µF
ROUT = 6.6Ω
0
COUT = 15µF
ROUT = 6.6Ω
6
4
2
0
– 0.2 0
COUT = 150µF
ROUT = 6.6Ω
0.2 0.4 0.6 0.8 1.0 1.2 1.4
TIME (ms)
1470/71 G09
Inrush Current (5V Switch)
3
CURRENT
2 LIMITED
TJ = 25°C
1
0
COUT = 150µF
ROUT = 10Ω
6
COUT = 15µF
ROUT = 10Ω
4
2
0
– 0.2 0
0.2 0.4 0.6 0.8 1.0 1.2 1.4
TIME (ms)
1470/71 G08
PIN FUNCTIONS
LTC1470
OUT (Pins 1, 8): Output Pins. The outputs of the LTC1470
are switched between three operating states: OFF, 3.3V
and 5V. These pins are protected against accidental short
circuits to ground by SafeSlot current limit circuitry which
protects the socket, the card, and the system power
supplies against damage. A second level of protection is
provided by thermal shutdown circuitry which protects
both switches against over-temperature conditions.
5VIN (Pin 2): 5V Input Supply Pin. The 5VIN supply pin
serves two purposes. The first purpose is as the power
supply input for the 5V NMOS switch. The second purpose
is to provide power for the input, gate drive, and protection
circuitry for both the 3.3V and 5V VCC switches. This pin
must therefore be continuously powered.
EN1, EN0 (Pins 3, 4): Enable Inputs. The two VCC Enable
inputs are designed to interface directly with industry
standard PCMCIA controllers and are high impedance
CMOS gates with ESD protection diodes to ground, and
should not be forced above 5VIN or below ground. Both
inputs have about 100mV of built-in hysteresis to ensure
clean switching between operating modes. The LTC1470
is designed to operate without 12V power. The gates of the
VCC NMOS switches are powered by charge pumps from
the 5VIN supply pins (see Applications Information section
for more detail). The Enable inputs should be turned off
(both asserted high or both asserted low) at least 100µs
before the 5VIN power is removed to ensure that both VCC
NMOS switch gates are fully discharged and both switches
are in the high impedance mode.
GND (Pin 5): Ground Connection.
3VIN (Pins 6, 7): 3V Input Supply Pins. The 3VIN supply
pins serve as the power supply input for the 3.3V switches.
These pins do not provide any power to the internal control
circuitry and therefore do not consume any power when
unloaded or turned off.
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