Datasheet

LT1964
7
1964f
TIME (µs)
0
0.2
0.1
0
–0.1
–0.2
0
–100
–200
1964 G30
400 800 1200 1600 2000
LOAD CURRENT
(mA)
OUTPUT VOLTAGE
DEVIATION (V)
V
IN
= –6V
C
IN
= 10µF
C
OUT
= 10µF
TIME (µs)
0
0.04
0.02
0
–0.02
–0.04
0
–100
–200
1964 G31
40 80 120 16020 60 100 140 180 200
LOAD CURRENT
(mA)
OUTPUT VOLTAGE
DEVIATION (V)
V
IN
= –6V
C
IN
= 10µF
C
OUT
= 10µF
TYPICAL PERFOR A CE CHARACTERISTICS
UW
LT1964-5, 10Hz to 100kHz Output
Noise, C
BYP
= 1000pF
LT1964-5, 10Hz to 100kHz Output
Noise, C
BYP
= 0.01µF
V
OUT
(100µV/DIV)
C
OUT
= 10µF 1ms/DIV 1964 G28.tif
I
LOAD
= –200mA
V
OUT
(100µV/DIV)
C
OUT
= 10µF 1ms/DIV 1964 G29.tif
I
LOAD
= –200mA
LT1964-5, Transient Response,
C
BYP
= 0
LT1964-5, Transient Response,
C
BYP
= 0.01µF
PI FU CTIO S
UUU
GND (Pin 1): Ground.
IN (Pin 2): Power is Supplied to the Device Through the
Input 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 1µF to 10µF is sufficient.
BYP (Pin 3, Fixed/–BYP devices): The BYP Pin is used to
Bypass the Reference of the LT1964 to Achieve Low Noise
Performance from the Regulator. A small capacitor from
the output to this pin will bypass the reference to lower the
output voltage noise. A maximum value of 0.01µF can be
used for reducing output voltage noise to a typical 30µV
RMS
over a 10Hz to 100kHz bandwidth. If not used, this pin
must be left unconnected.
SHDN (Pin 3/4, –SHDN/Fixed Devices): The SHDN Pin is
used to put the LT1964 into a Low Power Shutdown State.
The SHDN pin is referenced to the GND pin for regulator
control, allowing the LT1964 to be driven by either positive
or negative logic. The output of the LT1964 will be off when
the SHDN pin is pulled within ±0.8V of GND. Pulling the
SHDN pin more than –1.9V or +1.6V will turn the LT1964
on. The SHDN pin can be driven by 5V logic or open