LT1175 datasheet(4/18 Pages) LINER

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LT1175

1175fe

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: SHDN pin maximum positive voltage is 30V with respect to

–VIN and 13.5V with respect to GND. Maximum negative voltage is –20V

with respect to GND and –5V with respect to –VIN.

Note 3: PMAX = 1.5W for 8-pin packages, and 6W for 5-pin packages.

This power level holds only for input-to-output voltages up to 12V, beyond

which internal power limiting may reduce power. See Guaranteed Current

Limit curve in Typical Performance Characteristics section. Note that all

conditions must be met.

Note 4: GND pin current increases because of power transistor base

drive. At low input-to-output voltages (<1V) where the power transistor

The l denotes specifications which apply over the operating temperature

range, otherwise specifications are at TA = 25°C. VOUT = 5V, VIN = 7V, IOUT = 0, VSHDN = 3V, ILIM2 and ILIM4 tied to VIN, TJ = 25°C, unless

otherwise noted. To avoid confusion with “min” and “max” as applied to negative voltages, all voltages are shown as absolute values

except where polarity is not obvious.

is in saturation, GND pin current will be slightly higher. See Typical

Performance Characteristics.

Note 5: With ILOAD = 0, at TJ > 125°C, power transistor leakage could

increase higher than the 10µA to 25µA drawn by the output divider or fixed

voltage SENSE pin, causing the output to rise above the regulated value.

To prevent this condition, an internal active pull-up will automatically turn

on, but supply current will increase.

Note 6: This is the current required to pull the output voltage to within 1V

of ground during shutdown.

Note 7: Dropout voltage is measured by setting the input voltage equal to

the normal regulated output voltage and measuring the difference between

VIN and VOUT. For currents between 100mA and 500mA, with both ILIM

pins tied to VIN, maximum dropout can be calculated from

VDO = 0.15 + 1.1Ω (IOUT).

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Feedback Sense Voltage

Adjustable Part

Fixed 5V Part

3.743

4.93

3.8

5.0

3.857

5.075

Output Voltage Initial Accuracy

Adjustable, Measured at 3.8V Sense

Fixed 5V

0.5

1.5

Output Voltage Accuracy (All Conditions)

VIN – VOUT = 1V to VIN = 20V, IOUT = 0A to 500mA

P = 0 to PMAX, TJ = TMIN to TMAX (Note 3)

1.5

2.5

Quiescent Input Supply Current

VIN – VOUT ≤ 12V

µA

GND Pin Current Increase with Load (Note 4)

µA/mA

Input Supply Current in Shutdown

VSHDN = 0V

µA

Shutdown Thresholds (Note 9)

Either Polarity On SHDN Pin

0.8

2.5

SHDN Pin Current (Note 2)

VSHDN = 0V to 10V (Flows Into Pin)

VSHDN = –15V to 0V (Flows Into Pin)

µA

Output Bleed Current in Shutdown (Note 6)

VOUT = 0V, VIN = 15V

0.1

µA

SENSE Pin Input Current

(Adjustable Part Only, Current Flows Out of Pin)

(Fixed Voltage Only, Current Flows Out of Pin)

150

µA

Dropout Voltage (Note 7)

IOUT = 25mA

IOUT = 100mA

IOUT = 500mA

ILIM2 Open, IOUT = 300mA

ILIM4 Open, IOUT = 200mA

ILIM2, ILIM4 Open, IOUT = 100mA

0.1

0.18

0.5

0.33

0.3

0.26

0.2

0.26

0.7

0.5

0.45

Current Limit (Note 11)

VIN – VOUT = 1V to 12V

ILIM2 Open

ILIM4 Open

ILIM2, ILIM4 Open

520

390

260

130

800

600

400

200

1300

975

650

325

Line Regulation (Note 10)

VIN – VOUT = 1V to VIN = 20V

0.003

0.015

%/V

Load Regulation (Note 5, 10)

IOUT = 0mA to 500mA

0.1

0.35

Thermal Regulation

P = 0 to PMAX (Notes 3, 8)

5-Pin Packages

8-Pin Packages

0.04

0.1

0.2

%/W

Output Voltage Temperature Drift

TJ = 25°C to TJMIN, or 25°C to TJMAX

0.25

1.25

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