LT6654_12 LINER [Linear Technology], LT6654_12 Datasheet - Page 13

• Manufacturer Part Number: LT6654_12
• Description: SOT-23 Precision Wide Supply High Output Drive Low Noise Reference
• Manufacturer: LINER [Linear Technology]

APPLICATIONS INFORMATION
Bypass and Load Capacitors
The LT6654 voltage references should have an input by-
pass capacitor of 0.1μF or larger, however the bypassing
on other components nearby is suffi cient. In high voltage
applications, V
can create an input voltage transient that could exceed the
maximum input voltage rating. To prevent this worst-case
condition, an RC input line fi lter of 10μs (i.e. 10Ω and 1μF)
is recommended. These references also require an output
capacitor for stability. The optimum output capacitance for
most applications is 1μF, although larger values work as
well. This capacitor affects the turn-on and settling time
for the output to reach its fi nal value.
Figure 1 shows the turn-on time for the LT6654-2.5 with a
0.1μF input bypass and 1μF load capacitor. Figure 2 shows
the output response to a 0.5V transient on V
same capacitors.
The test circuit of Figure 3 is used to measure the stability
with various load currents. With R
duces a current step of 1mA. Figure 4 shows the response
to a ± 0.5mA load. Figure 5 is the output response to a
sourcing step from 4mA to 5mA, and Figure 6 is the output
response of a sinking step from 4mA to 5mA.
IN
> 30V, an output short-circuit to ground
L
= 1k, the 1V step pro-
IN
with the
V
3V
IN
2mV/DIV/AC
Figure 3. Load Current Response Time Test Circuit
Figure 1. Turn-On Characteristics of LT6654-2.5
Figure 2. Output Response to 0.5V Ripple on V
0.5V/DIV
1V/DIV
1V/DIV
2.5V/DC
V
C
0.1μF
3V/DC
GND
GND
OUT
V
IN
V
OUT
IN
V
IN
4
C
LOAD
C
LOAD
= 1μF
= 1μF
LT6654-2.5
1, 2
20μs/DIV
50μs/DIV
6
C
1μF
L
1k
6654 F01
6654 F02
LT6654
V
GEN
IN
13
6654 F03
6654fc
1V