-5V/-12V/-15V or Adjustable, High-Efficiency,

8

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______________________________________________________________Pin Description

PIN

NAME

FUNCTION

1

OUT

2

FB

3

SHDN

4

REF

1.5V reference output that can source 100µA. Bypass to ground with 0.1µF.

5

V+

Positive power-supply input

6

CS

Noninverting input to the current-sense comparator. Typical trip level is 210mV (relative to V+).

7

EXT

The gate-drive output for an external P-channel power MOSFET. EXT swings from OUT to V+.

8

GND

Ground

and it is the negative supply input for the EXT driver.

use an external voltage divider, as described in the Adjustable Output section.

Active-high shutdown input. With SHDN high, the part is in shutdown mode and the supply current is less

than 5µA. Connect to GND for normal operation.

Typical Operating Characteristics (continued)

CIRCUIT OF FIGURE 2

LOAD-TRANSIENT RESPONSE

100

µs/div

A

B

CIRCUIT OF FIGURE 2

A: V+, 3V TO 8V, 5V/div

LINE-TRANSIENT RESPONSE

2ms/div

A

B