LTC1981/LTC1982

7

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

PACKAGE DESCRIPTIO

Dimensions in inches (millimeters) unless otherwise noted.

S5 Package

5-Lead Plastic SOT-23

(LTC DWG # 05-08-1633)

S6 Package

6-Lead Plastic SOT-23

(LTC DWG # 05-08-1634)

0.95

(0.037)

REF

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

2.80 – 3.00

(0.110 – 0.118)

(NOTE 3)

1.90

(0.074)

REF

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

1.50 – 1.75

(0.059 – 0.069)

0.35 – 0.55

(0.014 – 0.022)

0.35 – 0.50

(0.014 – 0.020)

SIX PLACES (NOTE 2)

S6 SOT-23 0898

2.80 – 3.00

(0.110 – 0.118)

(NOTE 3)

1.90

(0.074)

REF

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)

2.6 – 3.0

(0.110 – 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)

Figure 4. Reverse Battery Protection

GATE

SHDN

GND

GDR

LTC1981

LOAD

1981/82 F04

3V

(1.8V TO 5V)

Si3442DV

10k

10k

0.1

µF

1

2

3

5

4

150

Ω

GATE

DRIVE

READY

Reverse Battery Protection

The LTC1981/LTC1982 can be protected against reverse

battery conditions by connecting a 150

Ω resistor in series

with the supply pin as shown in Figure 4. The resistor

limits the supply current to less than 24mA with –3.6V

applied. Because the LTC1981/LTC1982 draw very little

current while in normal operation, the drop across the

resistor is minimal. Control logic can be protected by

adding 10k resistors in series with the input pins.