LT1790AIS6-2.5#TR Linear Technology, LT1790AIS6-2.5#TR Datasheet - Page 19

• Manufacturer Part Number: LT1790AIS6-2.5#TR
• Description: IC REF LDO 2.5V MICROPWR SOT23-6
• Manufacturer: Linear Technology

Specifications of LT1790AIS6-2.5#TR

• Reference Type: Series
• Voltage - Output: 2.5V
• Tolerance: ±0.05%
• Temperature Coefficient: 10ppm/°C
• Voltage - Input: 3 ~ 18 V
• Number Of Channels: 1
• Current - Quiescent: 60µA
• Current - Output: 5mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-6
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Cathode: -

APPLICATIONS INFORMATION
Bypass and Load Capacitors
The LT1790 voltage references should have an input bypass
capacitor of 0.1μF or larger, however the bypassing of other
local devices may serve as the required component. 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.
All LT1790 voltages perform virtually the same, so the
LT1790-2.5 is used as an example.
V
Figure 4. LT1790-2.5 Sourcing and Sinking 0.5mA
GEN
3V
2V
1V
0V
Figure 1. Turn-On Characteristics of LT1790-2.5
3V
2V
V
3V
IN
1790 F01
1790 F04
Figure 3. Response Time Test Circuit
V
V
V
(AC COUPLED)
IN
OUT
OUT
C
0.1μF
IN
4
LT1790-2.5
1, 2
Figure 1 shows the turn-on time for the LT1790-2.5 with a
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
of various load currents. With R
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.
6
V
Figure 2. Output Response to 0.5V Ripple on V
–2V
–3V
GEN
3V
2V
1V
0V
Figure 5. LT1790-2.5 Sourcing 4mA to 5mA
C
1μF
L
1k
V
GEN
1790 F03
1V
L
= 1k, the 1V step produces
1790 F02
1790 F05
LT1790
IN
V
V
V
(AC COUPLED)
IN
OUT
OUT
IN
with the
19
1790fb