LT6656



6656fa

elecTrical characTerisTics

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: If the parts are stored outside of the specified temperature range,

the output may shift due to hysteresis.

Note 3: The stated temperature is typical for soldering of the leads during

manual rework. For detailed IR reflow recommendations, refer to the

Applications section.

Note 4: Temperature coefficient is measured by dividing the maximum

change in output voltage by the specified temperature range.

Note 5: Load regulation is measured with a pulse from no load to the

specified load current. Output changes due to die temperature change

must be taken into account separately.

Note 6: Excludes load regulation errors.

Note 7: Peak-to-peak noise is measured with a 3-pole highpass filter at

0.1Hz and a 4-pole lowpass filter at 10Hz. The unit is enclosed in a still-air

environment to eliminate thermocouple effects on the leads. The test

time is 10 seconds. RMS noise is measured on a spectrum analyzer in a

shielded environment.

Note 8: Long term stability typically has a logarithmic characteristic and

therefore, changes after 1000 hours tend to be much smaller than before

that time. Total drift in the second thousand hours is normally less than

one third that of the first thousand hours with a continuing trend toward

reduced drift with time. Long-term stability will also be affected by

differential stresses between the IC and the board material created during

board assembly.

Note 9: Hysteresis in output voltage is created by mechanical stress

that differs depending on whether the IC was previously at a higher or

lower temperature. Output voltage is always measured at 25°C, but

the IC is cycled to the hot or cold temperature limit before successive

measurements. For instruments that are stored at well controlled

temperatures (within 20 or 30 degrees of operational temperature)

hysteresis is usually not a dominant error source.

Typical perForMance characTerisTics

Output Voltage Temperature Drift

Supply Current vs Input Voltage

100

10

1

0.1

INPUT VOLTAGE (V)

0

10

18

6

14

6656 G17

20

8

16

4

12

2

1.25V OPTION

TEMPERATURE (°C)

–60 –40

–1000

0

1000

2000

3000

5000

6000

7000

8000

9000

4000

10000

–20 0 20 40

6652 G01

60

120

100

80

ALL OPTIONS

25 TYPICAL UNITS

NORMALIZED AT 25°C

OUTPUT VOLTAGE ERROR (%)

–0.10

0.10

200

20

180

140

100

60

160

120

80

40

0

6656 G02

–0.02

–0.06

0.06

0.02

0

ALL OPTIONS