350mA, 16.5V Input,
Low-Dropout Linear Regulators
____________________________Typical Operating Characteristics (continued)
(V
IN
= 5V (MAX1658), V
IN
= 6V (MAX1659);
SHDN
= IN; SET = GND; C
IN
= 0.1µF; C
OUT
= 10µF tantalum; T
A
= +25°C; unless
otherwise noted.)
MAX1658 OVERSHOOT AND
TIME EXITING SHUTDOWN
MAX1658/59TOC14
MAX1658/MAX1659
MAX1659 OVERSHOOT AND
TIME EXITING SHUTDOWN
MAX1658/59TOC15
3.3V
5V
A
0V
A
0V
B
B
100µs/div
A: OUTPUT VOLTAGE (1V/div)
B: SHDN PIN VOLTAGE (2V/div)
100µs/div
A: OUTPUT VOLTAGE (2V/div)
B: SHDN PIN VOLTAGE (2V/div)
OUTPUT NOISE
10
4
OUTPUT NOISE DENSITY (nV
RMS
/√Hz)
OUTPUT NOISE DENSITY
vs. FREQUENCY
MAX1658 TOC02
10
3
10
2
V
OUT
= 5V
I
OUT
= 165mA
10
10
FREQUENCY (Hz)
50k
10ms/div
10Hz TO 100kHz NOISE, V
OUT
= 5V (1mV/div), I
OUT
= 165mA
______________________________________________________________Pin Description
PIN
1
2
3, 6, 7
NAME
SET
SHDN
IN
FUNCTION
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.
Shutdown Input. When
SHDN
is low, the device turns off and typically draws 0.1µA of supply current.
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.
Regulated Output Voltage. Fixed or adjustable from 1.25V to 16V. Sources up to 350mA. For stable opera-
tion, bypass with a 10µF, low-ESR (<0.2Ω) capacitor from OUT to GND. For improved load-transient
response, use a larger low-ESR capacitor.
Ground
_______________________________________________________________________________________
5
4, 5
8
OUT
GND
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
