Datasheet

MAX1735
200mA, Negative-Output, Low-Dropout
Linear Regulator in SOT23
_______________________________________________________________________________________ 5
SHUTDOWN RESPONSE
(DRIVEN FROM A POSITIVE VOLTAGE)
MAX1735 toc14a
TIME (200
µ
s/div)
V
SHDN
2V/div
0
V
OUT
2V/div
0
SHUTDOWN RESPONSE
(DRIVEN BY A NEGATIVE VOLTAGE)
MAX1735 toc14b
TIME (200
µ
s/div)
V
SHDN
2V/div
V
OUT
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
MAX1735 toc15
SHUTDOWN-PIN VOLTAGE (V)
SHUTDOWN-PIN BIAS CURRENT (µA)
INVALID LOGIC VOLTAGE INVALID LOGIC VOLTAGE
Pin Description
PIN NAME FUNCTION
1 GND Ground
2IN
Regulator Input. Supply voltage can range from -2.5V to -6.5V. Bypass with a 1µF 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 1µF ceramic
capacitor.
Typical Operating Characteristics (continued)
(Circuit of Figure 2, V
IN
= -4.0V, V
OUT
= -3.0V, T
A
= +25°C, unless otherwise specified.)
Dual Mode is a trademark of Maxim Integrated Products, Inc.