LT3014
TYPICAL PERFOR A CE CHARACTERISTICS
Minimum Input Voltage
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
–50 –25
LOAD REGULATION (mV)
I
LOAD
= 20mA
OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)
MINIMUM INPUT VOLTAGE (V)
25
75
0
50
TEMPERATURE (°C)
10Hz to 100kHz Output Noise
OUTPUT VOLTAGE
DEVIATION (V)
V
OUT
200µV/DIV
LOAD CURRENT (mA)
C
OUT
= 0.47µF
I
L
= 20mA
V
OUT
= 1.22V
PI FU CTIO S
(SOT-23 Package/DD Package)
IN (Pin 1/Pin 8):
Input. Power is supplied to the device
through the IN pin. A bypass capacitor is required on this
pin if the device is more than six inches away from the main
input filter capacitor. In general, the output impedance of
a battery rises with frequency, so it is advisable to include
a bypass capacitor in battery-powered circuits. A bypass
capacitor in the range of 0.1µF to 10µF is sufficient. The
LT3014 is designed to withstand reverse voltages on the
IN pin with respect to ground and the OUT pin. In the case
of a reversed input, which can happen if a battery is
plugged in backwards, the LT3014 will act as if there is a
diode in series with its input. There will be no reverse
current flow into the LT3014 and no reverse voltage will
6
U W
100
3014 G19
Load Regulation
0
–5
–10
–15
–20
–25
–30
–35
125
–40
– 50 – 25
0
25
50
75
100
125
∆I
L
= 100µA TO 20mA
V
OUT
= 1.22V
10
Output Noise Spectral Density
C
OUT
= 0.47µF
I
L
= 20mA
V
OUT
= 1.22V
1
0.1
0.01
10
100
1k
10k
FREQUENCY (Hz)
100k
3014 G21
TEMPERATURE (°C)
3014 G20
Transient Response
0.04
0.02
0
–0.02
–0.04
V
IN
= 7V
V
OUT
= 5V
C
IN
= C
OUT
= 0.47µF CERAMIC
∆I
LOAD
= 1mA TO 5mA
6
4
2
0
0
200
600
400
TIME (µs)
800
1000
3014 G23
1ms/DIV
3014 G22
U
U
U
appear at the load. The device will protect both itself and
the load.
GND (Pin 2/Pins 4, 9):
Ground.
SHDN (Pin 3/Pin 5):
Shutdown. The SHDN pin is used to
put the LT3014 into a low power shutdown state. The
output will be off when the SHDN pin is pulled low. The
SHDN pin can be driven either by 5V logic or open-
collector logic with a pull-up resistor. The pull-up resistor
is only required to supply the pull-up current of the open-
collector gate, normally several microamperes. If unused,
the SHDN pin must be tied to IN or to a logic high.
3014fb
LINER [ LINEAR TECHNOLOGY ]
