LT1175CS8 datasheet(6/18 Pages) LINER

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LT1175

1175fe

Typical perForMance characTerisTics

GND Pin Current

Ripple Rejection

Shutdown Input Current

Shutdown Thresholds

SHDN Pin Characteristics

INPUT VOLTAGE (V)

1175 G07

TJ = 125°C

TJ = –55°C

TJ = 25°C

TEMPERATURE (°C)

–50

2.5

2.0

1.5

1.0

0.5

1175 G08

–25

100 125

POSITIVE THRESHOLD

NEGATIVE THRESHOLD

DEVICE IS OFF

BELOW THRESHOLD

SHUTDOWN TO GROUND VOLTAGE (V)

–25 –20

–10

–5

–10

1175 G09

–15

–5

VIN = 25V

CHARACTERISTICS DO NOT

CHANGE SIGNIFICANTLY WITH

TEMPERATURE, SO A SINGLE

CURVE IS SHOWN. POSITIVE

CURRENT FLOWS INTO

SHDN PIN

IF SHDN PIN IS NEGATIVE WITH

RESPECT TO INPUT VOLTAGE AND

INPUT VOLTAGE IS LESS THAN 15V,

NEGATIVE BREAKOVER POINT WILL

BE ABOUT 8V BELOW –VIN

OUTPUT CURRENT (A)

0.2

0.4

0.3

0.5

1175 G10

0.1

0.6

0.7

POWER

TRANSISTOR

IN DROPOUT

TJ = –55°C

TJ = 25°C

VIN – VOUT ≥ 3V

TJ = 25°C

VIN – VOUT = 2V

TJ = 25°C

FREQUENCY (Hz)

100

10k

100

100k

VOUT = 12V

(ADJUSTABLE)

IOUT = 100mA

VIN – VOUT = 2V

COUT = 1µF TANT

1175 G11

RIPPLE REJECTION IS RELATIVELY INDEPENDENT OF

INPUT VOLTAGE AND LOAD FOR CURRENTS BETWEEN

25mA AND 500mA. LARGER OUTPUT CAPACITORS DO

NOT IMPROVE REJECTION FOR FREQUENCIES BELOW

50kHz. AT VERY LIGHT LOADS, REJECTION WILL

IMPROVE WITH LARGER OUTPUT CAPACITORS

VOUT = 12V

(ADJUSTABLE)

WITH 0.1µF ACROSS

DIVIDER RESISTOR

VOUT = 5V

(FIXED)

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