LT6654BX

7

Rev. 0

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Bypass and Load Capacitors

The LT6654BXMS8 operates between –40°C to 175°C,

and performs similarly to LT6654BHS6 within –40°C to

125°C specified temperature range. The LT6654BX refer-

ence is offered in an MS8, 8-lead MSOP package.

The LT6654BX voltage reference should have an input by-

pass capacitor of 0.1μF or larger. However, for light load-

ing, the bypassing on other components nearby is suf-

output short-circuit to ground can create an input voltage

transient that could exceed the maximum input voltage

rating. To prevent this worst-case condition, an RC input

line filter of 10μs (i.e. 10Ω and 1μF) is recommended.

This reference also requires an output capacitor for sta-

bility. The optimum output capacitance for most applica-

tions is 1μF, although larger values work as well. This

capacitor affects the turn-on and settling time for the

output to reach its final value. Figures 1 and 2 show

APPLICATIONS INFORMATION

the turn-on time for the LT6654BX, 2.5V output volt-

age with a 0.1μF input bypass and 1μF load capacitor

at 25°C and 175°C, respectively. Figures 3 and 4 show

same capacitors, at 25°C and 175°C, respectively. The

test circuit of Figure 5 is used to measure the stability

produces a current step of 1mA. Figures 6 and 7 show

the response to a ±0.5mA load at 25°C and 175°C,

respectively. Figures 8 and 9 are the output response

to a sourcing step at 25°C and 175°C, respectively, and

Figures 10 and 11 are the output response of a sinking

step at 25°C and 175°C, respectively.

Figure 1. 25°C Turn-On Characteristics of LT6654BX-2.5

Figure 2. 175°C Turn-On Characteristics of LT6654BX-2.5

20µs/DIV

GND

GND

1V/DIV

1V/DIV

6654BX F01

50µs/DIV

1V/DIV

GND

1V/DIV

GND

6654BX F02

50µs/DIV

3.5V

3V

6654BX F03

+2V

–2V

100µs/DIV

3.5V

3V

+5mV

–5mV

6654BX F04