19-1679; Rev 0; 4/00
12V, Ultra-Low-I , Low-Dropout
Q
Linear Regulators with POK
General Description
Features
The MAX8880/MAX8881 are ultra-low supply current,
low-dropout linear regulators, capable of delivering up
to 200mA. They are designed for battery-powered
applications where reverse battery protection and long
battery life are critical.
ꢀ 3.5µA Supply Current at 12V
ꢀ Reverse Battery Protection
ꢀ 2.5V to 12V Input Voltage Range
ꢀ
1.5ꢀ ꢁutput Voltage Accuracy
These regulators’ low 3.5µA supply current extends
battery life in applications with long standby periods.
Unlike PNP-based designs, a 2Ω PMOS device main-
tains ultra-low supply current throughout the entire
operating range and in dropout. The parts are internally
protected from output short circuits, reverse battery
connection, and thermal overload. An internal power-
OK (POK) comparator indicates when the output is out
of regulation.
ꢀ 200mA max ꢁutput Current
ꢀ 2Ω PMꢁS ꢁutput Device
ꢀ Short-Circuit and Thermal ꢁverload Protection
ꢀ PꢁK ꢁutput for ꢁut-of-Regulation Indicator
ꢀ Fixed 1.8V, 2.5V, 3.3V, and 5V (MAX8881)
Adjustable from 1.25V to 5V (MAX8880)
The MAX8880 output is adjustable from 1.25V to 5V
using an external resistor-divider. The MAX8881 pro-
vides only factory-preset output voltages of 1.8V, 2.5V,
3.3V, or 5V (see Ordering Information). Both devices
are available in miniature 6-pin SOT23 packages.
ꢀ Tiny 6-Pin SꢁT23 Package
________________________Applications
Smoke Detectors
PDAs
Handy Terminals
Battery-Powered Alarms
Remote Transmitters
Smart Battery Packs
CMOS Backup Power
Real-Time Clocks
Typical Operating Circuit
Pin Configuration
V
OUT
1.25V TO 5V
V
IN
TOP VIEW
IN
OUT
FB
2.5V TO 12V
UP TO 200mA
4.7µF
1µF
IN
GND
OUT
1
2
3
6
5
4
POK
SHDN
FB
MAX8881
MAX8880
MAX8881
REGULATION OK
ON
SHDN
POK
OFF
GND
SꢁT23-6
Ordering Information
PART
ꢁUTPUT
Adjustable
1.8V
TEMP. RANGE
-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
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
TꢁP MARK
AAHR
MAX8880EUT-T
MAX8881EUT18-T
MAX8881EUT25-T
MAX8881EUT33-T
MAX8881EUT50-T
AAHS
2.5V
AAHT
3.3V
AAHU
5.0V
AAHV
________________________________________________________________ Maxim Integrated Products
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.