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LT1761 Series

1761fa LT/TP 0401 2K REV A • PRINTED IN USA

©LINEAR TECHNOLOGY CORPORATION 1999

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408)432-1900q FAX:(408)434-0507 q www.linear-tech.com

Dimensions in inched (millimeters) unless otherwise noted.

S5 Package

5-Lead Plastic SOT-23

(LTC DWG # 05-08-1633)

1.50 – 1.75

(0.059 – 0.069)

0.35 – 0.55

(0.014 – 0.022)

0.35 – 0.50

(0.014 – 0.020)

FIVE PLACES (NOTE 2)

S5 SOT-23 0599

0.90 – 1.45

(0.035 – 0.057)

0.90 – 1.30

(0.035 – 0.051)

0.00 – 0.15

(0.00 – 0.006)

0.09 – 0.20

(0.004 – 0.008)

(NOTE 2)

2.60 – 3.00

(0.102 – 0.118)

NOTE:

1. DIMENSIONS ARE IN MILLIMETERS

2. DIMENSIONS ARE INCLUSIVE OF PLATING

3. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR

4. MOLD FLASH SHALL NOT EXCEED 0.254mm

5. PACKAGE EIAJ REFERENCE IS SC-74A (EIAJ)

0.95

(0.037)

REF

2.80 – 3.00

(0.110 – 0.118)

(NOTE 3)

1.90

(0.074)

REF

PACKAGE DESCRIPTIO

The top resistor of the resistor divider must be chosen to

limit the current into the ADJ pin to less than 5mA when the

ADJ pin is at 7V. The 13V difference between output and

ADJ pin divided by the 5mA maximum current into the ADJ

pin yields a minimum top resistor value of 2.6k.

In circuits where a backup battery is required, several

different input/output conditions can occur. The output

voltage may be held up while the input is either pulled to

ground, pulled to some intermediate voltage or is left open

circuit. Current flow back into the output will follow the

curve shown in Figure 6.

When the IN pin of the LT1761-X is forced below the OUT

pin or the OUT pin is pulled above the IN pin, input current

will typically drop to less than 2

µA. This can happen if the

input of the device is connected to a discharged (low

voltage) battery and the output is held up by either a

Figure 6. Reverse Output Current

OUTPUT VOLTAGE (V)

100

1761 F06

0123

TJ = 25°C

VIN = 0V

CURRENT FLOWS

INTO OUTPUT PIN

VOUT = VADJ

(LT1761-BYP, -SD)

LT1761-BYP

LT1761-SD

LT1761-2

LT1761-3.3

LT1761-5

LT1761-1.8

LT1761-1.5

LT1761-2.5

LT1761-2.8

LT1761-3

backup battery or a second regulator circuit. The state of

the SHDN pin will have no effect on the reverse output

current when the output is pulled above the input.

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Burst Mode

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Burst Mode is a trademark of Linear Technology Corporation.

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