MAX774CSLASHD datasheet(8/16 Pages) MAXIM

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

Low IQ Inverting DC-to-DC Controllers

_______________________________________________________________________________________

______________________________________________________________Pin Description

NAME

FUNCTION

OUT

SHDN

REF

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

V+

Positive power-supply input

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

EXT

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

GND

Ground

The sense input for fixed-output operation (VFB = VREF). OUT is connected to the internal voltage divider,

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

Feedback input. When VFB = VREF, the output will be the factory preset value. For adjustable operation,

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)

(TA = +25°C, unless otherwise noted.)

CIRCUIT OF FIGURE 2

V+ = 6V, VOUT = -5V

A: ILOAD, 30mA TO 1A, 1A/div

B: VOUT, 100mV/div, AC-COUPLED

LOAD-TRANSIENT RESPONSE

100

µs/div

CIRCUIT OF FIGURE 2

VOUT = -5V, ILOAD = 1A

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

B: VOUT, 100mV/div, AC-COUPLED

LINE-TRANSIENT RESPONSE

2ms/div

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