
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
FUNCT IONAL BLOCK DIAGRAMS
50mV
V
IN
ADM663
SHDN
GND
V
TC
V
SET
V
OUT1
V
OUT2
SENSE
1.3V
REF
C2
0.9V
0.5V
C1
A2
A1
50mV
V
IN
ADM666
SHDN
GND
LBO
V
SET
LBI
V
OUT
SENSE
1.3V
REF
C2
0.5V
C1
C3
A1
REV. 0
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use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
a
+5 V Fixed, Adjustable
Mcropower Linear Voltage Regulators
ADM663/ADM666
FEATURES
5 V Fixed or +1.3 V to +16 V Adjustable
Low Power CMOS: 12
μ
A max Quiescent Current
40 mA Output Current
Current Limiting
Pin Compatible with MAX663/666
+2 V to +16.5 V Operating Range
Low Battery Detector ADM666
No Overshoot on Power-Up
APPLICATIONS
Handheld Instruments
LCD Display Systems
Pagers
Remote Data Acquisition
GE NE RAL DE SCRIPT ION
T he ADM663/ADM666 are precision voltage regulators featur-
ing a maximum quiescent current of 12
μ
A. T hey can be used to
give a fixed +5 V output with no additional external compo-
nents or can be adjusted from 1.3 V to 16 V using two external
resistors. Fixed or adjustable operation is automatically selected
via the V
SET
input. T he low quiescent current makes these de-
vices especially suitable for battery powered systems. T he input
voltage range is 2 V to 16.5 V and an output current up to
40 mA is provided. T he ADM663 can directly drive an external
pass transistor for currents in excess of 40 mA. Additional fea-
tures include current limiting and low power shutdown. T her-
mal shutdown circuitry is also included for additional safety.
T he ADM666 features additional low battery monitoring
circuitry to detect for low battery voltages.
T he ADM663/ADM666 are pin-compatible replacements for
the MAX 663/666. Both are available in 8-pin DIP and in nar-
row surface mount (SOIC) packages.
ORDE RING GUIDE
Model
T emperature Range
Package Option
ADM663AN
ADM663AR
ADM666AN
ADM666AR
–40
°
C to +85
°
C
–40
°
C to +85
°
C
–40
°
C to +85
°
C
–40
°
C to +85
°
C
N-8
R-8
N-8
R-8