Datasheet
10
LT1962 Series
TYPICAL PERFOR A CE CHARACTERISTICS
UW
LT1962-5 10Hz to 100kHz
Output Noise (C
BYP
= 1000pF)
V
OUT
100µV/DIV
C
OUT
= 10µF 1ms/DIV 1962 G54
I
L
= 300mA
LT1962-5 10Hz to 100kHz
Output Noise (C
BYP
= 0.01µF)
V
OUT
100µV/DIV
C
OUT
= 10µF 1ms/DIV 1962 G55
I
L
= 300mA
LT1962-5 Transient Response
TIME (ms)
0
OUTPUT VOLTAGE
DEVIATION (V)LOAD CURRENT (mA)
0
0.2
0.4
1.6
1962 G56
–0.2
–0.4
0
100
200
300
0.4
0.2
0.6
0.8
1.2
1.8
1.4
1.0
2.0
V
IN
= 6V
C
IN
= 10µF
C
OUT
= 10µF
C
BYP
= 0
LT1962-5 Transient Response
TIME (µs)
0
OUTPUT VOLTAGE
DEVIATION (mV)LOAD CURRENT (mA)
0
0.05
0.10
400
1962 G57
–0.05
–0.10
0
100
200
300
100
50
150
200
300
450
350
250
500
V
IN
= 6V
C
IN
= 10µF
C
OUT
= 10µF
C
BYP
= 0.01µF
LT1962-5 10Hz to 100kHz
Output Noise (C
BYP
= 0)
V
OUT
100µV/DIV
C
OUT
= 10µF 1ms/DIV 1962 G52
I
L
= 300mA
LT1962-5 10Hz to 100kHz
Output Noise (C
BYP
= 100pF)
V
OUT
100µV/DIV
C
OUT
= 10µF 1ms/DIV 1962 G53
I
L
= 300mA
UU
U
PI FU CTIO S
OUT (Pin 1): Output. The output supplies power to the
load. A minimum output capacitor of 3.3µF is required to
prevent oscillations. Larger output capacitors will be
required for applications with large transient loads to limit
peak voltage transients. See the Applications Information
section for more information on output capacitance and
reverse output characteristics.
SENSE (Pin 2): Sense. For fixed voltage versions of the
LT1962 (LT1962-1.5/LT1962-1.8/LT1962-2.5/LT1962-3/
LT1962-3.3/LT1962-5), the SENSE pin is the input to the
error amplifier. Optimum regulation will be obtained at the
point where the SENSE pin is connected to the OUT pin of
the regulator. In critical applications, small voltage drops
are caused by the resistance (R
P
) of PC traces between the
regulator and the load. These may be eliminated by con-
necting the SENSE pin to the output at the load as shown
in Figure 1 (Kelvin Sense Connection). Note that the
voltage drop across the external PC traces will add to the
dropout voltage of the regulator. The SENSE pin bias
current is 10µA at the nominal rated output voltage. The
SENSE pin can be pulled below ground (as in a dual supply
system where the regulator load is returned to a negative
supply) and still allow the device to start and operate.
ADJ (Pin 2): Adjust. For the adjustable LT1962, this is the
input to the error amplifier. This pin is internally clamped
to ±7V. It has a bias current of 30nA which flows into the