19-2072; Rev 0; 1/02
500mA Low-Dropout Linear Regulator in UCSP
General Description
Features
The MAX1819 low-dropout linear regulator operates from
a 2.5V to 5.5V supply and delivers a guaranteed 500mA
load current with low 120mV dropout. The high-accuracy
( 1ꢀ% output voltage is preset at an internally trimmed
voltage (see the Selector Guide% or can be adjusted from
1.25V to 5V with an external resistive-divider.
♦ Guaranteed 500mA Output Current
♦ Low 90mV Dropout at 500mA
♦ ±±1 ꢀnꢁtꢁaꢂ Output Aꢃꢃuraꢃc
♦ Preset Output at ±.5V, ±.8V, 2V, 2.5V, 3.3V, 5V
♦ Adjustabꢂe Output from ±.25V to 5V
♦ Power-OK Output
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 6-pin UCSP™ package.
♦ Low ±25µA Ground Current
♦ 0.±µA Shutdown Current
♦ Thermaꢂ Overꢂoad Proteꢃtꢁon
♦ Output Current Lꢁmꢁt
♦ Tꢁnc 840mW 6-Pꢁn UCSP Paꢃkage
Ordering Information
PART
TEMP RANGE
PꢀN-PACKAGE
Applications
MAX1819EBL_ _ -T*
-40°C to +85°C 6 UCSP
Notebook Computers
Cellular and Cordless Telephones
Personal Digital Assistants (PDAs%
Palmtop Computers
Base Stations
*Insert the desired two-digit suffix (see Selector Guide) into the
blanks to complete the part number.
Selector Guide
PART AND
SUFFꢀX
USB Hubs
V
OUT
UCSP MARK
Docking Stations
MAX1819EBL 15
MAX1819EBL 18
MAX1819EBL 20
MAX1819EBL 25
MAX1819EBL 33
MAX1819EBL 50
1.5V or Adj
1.8V or Adj
2V or Adj
AAH
AAG
AAC
AAD
AAE
AAF
UCSP is a trademark of Maxim Integrated Products, Inc.
2.5V or Adj
3.3V or Adj
5V or Adj
Pin Configuration
Typical Operating Circuit
TOP VIEW
V
= 2.5V TO 5.5V
IN
IN
(TOP OF PC BOARD/
BALLS SOLDERED DOWN)
2
3
1
V
OUT
IN
OUT
NC
IN
POK
A2
SHDN
A3
C
OUT
3.3µF
C
A
B
C
1µF
A1
MAX1819
R
POK
100kΩ
MAX1819
ON
TO
µC
SHDN
SET
POK
GND
OUT
C1
OFF
GND
C3
SET
C2
UCSP
________________________________________________________________ Maxim Integrated Products
±
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.