LTC1983-3/LTC1983-5

9

sn1983 1983fs

part in and out of shutdown at the minimum allowable

frequency (refer to Figure 3) for a given output load.

General Layout Considerations

Due to the high switching frequency and high transient

currents produced by the LTC1983, careful board layout is

a must. A clean board layout using a ground plane and

short connections to all capacitors will improve perfor-

mance and ensure proper regulation under all conditions

(refer to Figures 4a and 4b). You will not get advertised

performance with careless layout.

Figure 3

OUTPUT CURRENT (

µA)

1

10

100

1000

1000

1983 F03b

1

10

100

SHDN ON PULSE WIDTH = 200

µs

Figure 4a. Recommended Component

Placement for a Single Layer Board

Figure 4b. Recommended Component

Placement for a Double Layer Board

1

2

3

SHDN

6

GND

5

4

1983 F04a

SHDN 6

GND 5

1983 F04b

BOTTOM LAYER

TOP LAYER

OPERATIO

(Refer to Block Diagram)