19-1680; Rev 1; 2/03
12V, Ultra-Low I
Q
, Low-Dropout
Linear Regulators
General Description
The MAX1725/MAX1726 are ultra-low supply current,
low-dropout linear regulators intended for low-power
applications that demand the longest possible battery
life. Unlike inferior PNP-based designs, the MAX1725/
MAX1726s鈥?PMOS pass elements maintain an ultra-low
2碌A(chǔ) supply current throughout their entire operating
range and in dropout. Despite their ultra-low power
consumption, the MAX1725/MAX1726 have tight output
accuracy (1.5%) and require just 1碌F output capacitance
to achieve good load-transient response.
These regulators have a wide input voltage range
(+2.5V to +12V), making them excellent choices for
systems powered from two lithium-ion (Li+) cells and 9V
batteries. Other features include reverse-battery protec-
tion, short-circuit protection, and thermal protection.
The MAX1725 provides an adjustable 1.5V to 5V output
using an external resistor-divider. The MAX1726 pro-
vides factory preset 1.8V, 2.5V, 3.3V, or 5V output volt-
ages (see the
Ordering Information).
Both devices are
available in a tiny 5-pin SOT23 package.
o
2碌A(chǔ) Supply Current
o
Reverse-Battery Protection
o
+2.5V to +12V Input Voltage Range
o
Fixed 1.8V, 2.5V, 3.3V, and 5V Output Voltages
(MAX1726)
o
Adjustable 1.5V to 5V Output Voltages (MAX1725)
o
20mA Guaranteed Output Current
o
1.5% Output Voltage Accuracy
o
Small 1碌F Output Capacitor
o
Short-Circuit Protection
o
Thermal Protection
o
Tiny 5-Pin SOT23 Package
Features
MAX1725/MAX1726
________________________Applications
Smoke Detectors
Remote Transmitters
Smart Battery Packs
Industrial Control Systems
Microcontroller Power
Real-Time Clock Backup Power
PDAs and Handy-Terminals
Battery-Powered Alarms
PART
MAX1725EUK-T
MAX1726EUK25-T
MAX1726EUK33-T
MAX1726EUK5-T
Ordering Information
TEMP RANGE
-40擄C to +85擄C
-40擄C to +85擄C
-40擄C to +85擄C
-40擄C to +85擄C
PIN-
PACKAGE
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
TOP
MARK
ADNK
ADNL
ADNM
ADNN
ADNO
MAX1726EUK18-T
-40擄C to +85擄C
Note:
See the Selector Guide for the MAX1725/MAX1726 output
options as they relate to the part number suffix.
Typical Operating Circuit
PART
V
IN
2.5V TO 12V
IN
OUT
OUTPUT
1.5V TO 5V
Selector Guide
OUTPUT VOLTAGE
(V)
Adj 1.5 to 5.0
Fixed 1.8
Fixed 2.5
Fixed 3.3
Fixed 5.0
MAX1725EUK-T
MAX1726EUK18-T
MAX1726EUK25-T
MAX1726EUK33-T
MAX1726EUK50-T
MAX1726
ON
OFF
SHDN
GND
Pin Configuration appears at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
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