MAX1725 Datasheet, PDF (1/7 Pages) Maxim Integrated Products – 12V, Ultra-Low IQ, Low-Dropout Linear Regulators

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’ PMOS pass elements maintain an ultra-low
2µA 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 1µF 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.
Features
o 2µA 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 1µF Output Capacitor
o Short-Circuit Protection
o Thermal Protection
o Tiny 5-Pin SOT23 Package
________________________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
Typical Operating Circuit
V_IN
2.5V TO 12V
ON
OFF
IN
OUT
MAX1726
SHDN
GND
OUTPUT
1.5V TO 5V
Ordering Information
PART
TEMP RANGE
MAX1725EUK-T
MAX1726EUK18-T
MAX1726EUK25-T
MAX1726EUK33-T
MAX1726EUK5-T
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°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
Note: See the Selector Guide for the MAX1725/MAX1726 output
options as they relate to the part number suffix.
Selector Guide
PART
MAX1725EUK-T
MAX1726EUK18-T
MAX1726EUK25-T
MAX1726EUK33-T
MAX1726EUK50-T
OUTPUT VOLTAGE
(V)
Adj 1.5 to 5.0
Fixed 1.8
Fixed 2.5
Fixed 3.3
Fixed 5.0
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
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