otherwise noted.)

PIN

NAME

FUNCTION

1

SET

Output-Voltage Input. Connecting SET to ground selects the factory-preset 3.3V (MAX1658) or 5V (MAX1659)

output voltage. For an adjustable output voltage, connect SET to a resistive voltage-divider from OUT to GND.

2

SHDN

Shutdown Input. When SHDN is low, the device turns off and typically draws 0.1μA of supply current.

3, 6, 7

IN

Unregulated Input Supply Voltage, 2.7V to 16.5V input range. The IN pins also serve as heatsinks. Connect to

a copper plane to achieve maximum thermal dissipation.

4, 5

OUT

Regulated Output Voltage. Fixed or adjustable from 1.25V to 16V. Sources up to 350mA. For stable operation,

bypass with a 10μF, low-ESR (<0.2Ω) capacitor from OUT to GND. For improved load-transient response, use

a larger low-ESR capacitor.

8

GND

Ground

B

A

0V

3.3V

100µs/div

MAX1658 OVERSHOOT AND

TIME EXITING SHUTDOWN

MAX1658/59 toc14

A: OUTPUT VOLTAGE (1V/div)

B: SHDN PIN VOLTAGE (2V/div)

B

A

0V

5V

100µs/div

MAX1659 OVERSHOOT AND

TIME EXITING SHUTDOWN

MAX1658/59TOC15

A: OUTPUT VOLTAGE (2V/div)

B: SHDN PIN VOLTAGE (2V/div)

10ms/div

OUTPUT NOISE

10

10

50k

OUTPUT NOISE DENSITY

vs. FREQUENCY

FREQUENCY (Hz)

MAX1658/MAX1659

350mA, 16.5V Input,

Low-Dropout Linear Regulators

Maxim Integrated │ 5

www.maximintegrated.com

Typical Operating Characteristics (continued)

Pin Description