200mA, Negative-Output, Low-Dropout

Linear Regulator in SOT23

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5

SHUTDOWN RESPONSE

(DRIVEN FROM A POSITIVE VOLTAGE)

MAX1735 toc14a

TIME (200

µs/div)

2V/div

0

2V/div

0

SHUTDOWN RESPONSE

(DRIVEN BY A NEGATIVE VOLTAGE)

MAX1735 toc14b

TIME (200

µs/div)

2V/div

2V/div

0

0

-0.5

0

0.5

1.0

1.5

2.0

-6.5

-2.0 -0.5

-5.0 -3.5

1.0 2.5 4.0 5.5

SHUTDOWN-PIN BIAS CURRENT

vs. SHUTDOWN-PIN VOLTAGE

SHUTDOWN-PIN VOLTAGE (V)

Pin Description

PIN

NAME

FUNCTION

1

GND

Ground

2IN

Regulator Input. Supply voltage can range from -2.5V to -6.5V. Bypass with a 1

µF capacitor to GND

(see Capacitor Selection and Regulator Stability). This pin also functions as a heatsink. Solder to a

large PC board pad or directly to the PC board power plane to maximize thermal dissipation.

3

SHDN

Shutdown Input. Drive SHDN to GND to turn the regulator off, reducing the input current to less than

1nA. Drive SHDN above +1.6V or below -1.6V to enable the regulator. Connect SHDN to IN for

always-on operation.

4

SET

Dual Mode™ Regulator Feedback Input. Connect SET to GND for the preset output voltage. Use a

resistive voltage-divider from OUT to SET to set the output voltage between -1.25V and -5.5V.

Regulation setpoint is -1.25V.

5

OUT

Regulator Output. OUT supplies up to 200mA in regulation. Bypass to GND with a 1

µF ceramic

capacitor.

Typical Operating Characteristics (continued)

Dual Mode is a trademark of Maxim Integrated Products.