MAX1818 Datasheet, PDF (1/9 Pages) Maxim Integrated Products – 500mA Low-Dropout Linear Regulator in SOT23

19-1860; Rev 1; 3/01
500mA Low-Dropout
Linear Regulator in SOT23
General Description
The MAX1818 low-dropout linear regulator operates
from a +2.5V to +5.5V supply and delivers a guaran-
teed 500mA load current with low 120mV dropout. The
high-accuracy (±1%) output voltage is preset at an
internally trimmed voltage (see Selector Guide) or can
be adjusted from 1.25V to 5.0V with an external resis-
tive divider.
An internal PMOS pass transistor allows the low 125µA
supply current to remain independent of load, making
this device ideal for portable battery-operated equip-
ment such as personal digital assistants (PDAs), cellu-
lar phones, cordless phones, base stations, and
notebook computers.
Other features include an active-low open-drain reset
output that indicates when the output is out of regula-
tion, a 0.1µA shutdown, short-circuit protection, and
thermal shutdown protection. The device is available in
a miniature 800mW 6-pin SOT23 package.
Applications
Notebook Computers
Cellular and Cordless Telephones
Personal Digital Assistants (PDAs)
Palmtop Computers
Base Stations
USB Hubs
Docking Stations
Pin Configuration
Features
o Guaranteed 500mA Output Current
o Low 120mV Dropout at 500mA
o ±1% Output Voltage Accuracy
Preset at 1.5V, 1.8V, 2.0V, 2.5V, 3.3V, 5V
Adjustable from 1.25V to 5.0V
o Power OK Output
o Low 125µA Ground Current
o 0.1µA Shutdown Current
o Thermal Overload Protection
o Output Current Limit
o Tiny 800mW 6-Pin SOT23 Package
Ordering Information
PART*
TEMP RANGE PIN-PACKAGE
MAX1818EUAT_ _ -40°C to +85°C 6 SOT23-6
*Insert the desired two-digit suffix (see Selector Guide) into the
blanks to complete the part number.
Note: The MAX1818 requires a special solder temperature
profile described in the Absolute Maximum Ratings section.
Selector Guide
PART AND
SUFFIX
MAX1818EUT15
MAX1818EUT18
MAX1818EUT20
MAX1818EUT25
MAX1818EUT33
MAX1818EUT50
V_OUT
1.5V or Adj
1.8V or Adj
2.0V or Adj
2.5V or Adj
3.3V or Adj
5.0V or Adj
SOT23
TOP MARK
AASO
AANU
AANV
AANF
AANG
AANH
Typical Operating Circuit
TOP VIEW
IN 1
6 OUT
MAX1818
POK 2
5 SET
SHDN 3
4 GND
SOT23
V_IN = 2.5V TO 5.5V
NINC
C_IN
1µF
OUT
MAX1818
ON
SHDN
POK
OFF
SET
GND
V_OUT
C_OUT
3.3µF
R_POK
100k
TO
µC
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