500mA Low-Dropout

Linear Regulator in µMAX

6

_______________________________________________________________________________________

SHUTDOWN WAVEFORM

MAX1792-15

20

µs/div

1V/div

1V/div

0

0

2V

3V

Ω (500mA)

RST WAVEFORM

MAX1792-16

20ms/div

2.5V/div

2V/div

0

5V

0

0

Ω (50mA)

2V/div

Pin Description

LINE-TRANSIENT RESPONSE

MAX1792-14

100

µs/div

1V/div

10mV/div

6V

3V

LOAD-TRANSIENT RESPONSE

NEAR DROPOUT

MAX1792-13

20

µs/div

500mA/div

50mV/div

µF

Ω TO 6.6Ω (5mA TO 500mA)

Typical Operating Characteristics (continued)

PIN

NAME

FUNCTION

1, 2

IN

Regulator Input. Supply voltage can range from +2.5V to +5.5V. Bypass with a 1

µF capacitor to GND (see

Capacitor Selection and Regulator Stability). Connect both input pins together externally.

3

RST

Ω pullup resistor

to OUT to obtain an output voltage.

4

SHDN

Active-Low Shutdown Input. A logic low reduces supply current to 0.1

µA. In shutdown, the RST output is

low and OUT is pulled low through an internal 5k

Ω resistor. Connect to IN for normal operation.

5

GND

Ground. This pin and the exposed pad also function as a heatsink. Solder both to a large pad or to the

circuit-board ground plane to maximize power dissipation.

6

SET

Voltage-Setting Input. Connect to GND for preset output. Connect to a resistive divider between OUT and

GND to set the output voltage between 1.25V and 5.0V.

7, 8

OUT

Regulator Output. Sources up to 500mA. Bypass with a 3.3

µF low-ESR capacitor to GND. Use a 4.7µF

capacitor for output voltages below 2V. Connect both output pins together externally.