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LT1521

300mA Low Dropout Regulators with Micropower Quiescent Current and Shutdown

Linear Technology 

APPLICATIONS INFORMATION

Table 4. Fault Conditions

INPUT PIN

< VOUT (Nominal)

SHDN PIN

Open (High)

OUTPUT/SENSE PINS

Forced to VOUT (Nominal)

< VOUT (Nominal)

Grounded

Forced to VOUT (Nominal)

Open

Open (High)

> 1V

Open

Grounded

> 1V

≤ 0.8V

Open (High)

≤ 0V

≤ 0.8V

Grounded

≤ 0V

> 1.5V

Open (High)

≤ 0V

– 20V < VIN < 20V

Grounded

≤ 0V

LT1521/LT1521-3

LT1521-3.3/LT1521-5

RESULTING CONDITIONS

Reverse Output Current ≈ 5µA (See Figure 3)

Input Current ≈ 1µA (See Figure 4)

Reverse Output Current ≈ 5µA (See Figure 3)

Input Current ≈ 1µA (See Figure 4)

Reverse Output Current ≈ 5µA (See Figure 3)

Reverse Output Current ≈ 5µA (See Figure 3)

Output Current = 0

Output Current = 0

Output Current = Short-Circuit Current

Output Current = 0

PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.

MS8 Package

8-Lead Plastic MSOP

(LTC DWG # 05-08-1660)

0.118 ± 0.004*

(3.00 ± 0.102)

8 76 5

0.192 ± 0.004

(4.88 ± 0.10)

0.118 ± 0.004**

(3.00 ± 0.102)

1 234

0.007

(0.18)

0° – 6° TYP

0.021 ± 0.006

(0.53 ± 0.015)

0.040 ± 0.006

(1.02 ± 0.15)

SEATING

PLANE

0.012

(0.30)

REF

0.0256

(0.65)

TYP

0.034 ± 0.004

(0.86 ± 0.102)

0.006 ± 0.004

(0.15 ± 0.102)

MSOP (MS8) 1197

* DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH,

PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.

INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

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