LT6654 Linear Technology, LT6654 Datasheet - Page 7

• Manufacturer Part Number: LT6654
• Description: SOT-23 Precision Wide Supply High Output Drive Voltage Reference
• Manufacturer: 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 may be suffi cient. 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 capaci-
tor affects the turn-on and settling time for the output to
reach its fi nal value.
V
3V
IN
COUPLED
Figure 2. Output Response to 0.5V Ripple on V
Figure 1. Turn-On Characteristics of LT6654-2.5
C
0.1μF
IN
3.5V
2.5V
V
2.5V
AC-
V
OUT
V
3V
Figure 3. Response Time Test Circuit
3V
IN
IN
4
LT6654-2.5
1, 2
TIME (50μs/DIV)
TIME (20μs/DIV)
6
C
1μF
L
1k
6654 F02
6654 F01
V
GEN
IN
6654 F03
1V
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.
Figure 4. LT6654-2.5 Sourcing and Sinking 0.5mA
SOURCING
SINKING
–0.5mA
Figure 5. LT6654-2.5 Sourcing 4mA to 5mA
0.5mA
Figure 6. LT6654-2.5 Sinking 4mA to 5mA
–5mA
–4mA
4mA
5mA
2.5V
2.5V
2.5V
L
= 1k, the 1V step pro-
6654 F05
6654 F04
6654 F06
LT6654
IN
with the
7
6654f