ADM666 Analog Devices, ADM666 Datasheet

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ADM666

Manufacturer Part Number
ADM666
Description
Manufacturer
Analog Devices
Datasheet

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GENERAL DESCRIPTION
The ADM663/ADM666 are precision voltage regulators featur-
ing a maximum quiescent current of 12 A. They 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
vices especially suitable for battery powered systems. The input
voltage range is 2 V to 16.5 V and an output current up to
40 mA is provided. The 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. Ther-
mal shutdown circuitry is also included for additional safety.
The ADM666 features additional low battery monitoring
circuitry to detect for low battery voltages.
The ADM663/ADM666 are pin-compatible replacements for
the MAX663/666. Both are available in 8-pin DIP and in nar-
row surface mount (SOIC) packages.
Model
ADM663AN
ADM663AR
ADM666AN
ADM666AR
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
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.
FEATURES
5 V Fixed or +1.3 V to +16 V Adjustable
Low Power CMOS: 12 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
SET
input. The low quiescent current makes these de-
Temperature Range
–40 C to +85 C
–40 C to +85 C
–40 C to +85 C
–40 C to +85 C
ORDERING GUIDE
Package Option
N-8
R-8
N-8
R-8
Micropower Linear Voltage Regulators
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
SHDN
GND
SHDN
GND
V
IN
V
IN
FUNCTIONAL BLOCK DIAGRAMS
+5 V Fixed, Adjustable
A1
A1
ADM663/ADM666
ADM666
1.3V
REF
1.3V
REF
0.9V
C1
C2
C3
C1
C2
ADM663
A2
50mV
50mV
0.5V
0.5V
Fax: 617/326-8703
V
V
V
V
LBI
LBO
V
V
SENSE
SENSE
OUT
SET
OUT2
OUT1
SET
TC

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ADM666 Summary of contents

Page 1

... LCD Display Systems Pagers Remote Data Acquisition GENERAL DESCRIPTION The ADM663/ADM666 are precision voltage regulators featur- ing a maximum quiescent current They can be used to give a fixed +5 V output with no additional external compo- nents or can be adjusted from 1 using two external resistors ...

Page 2

... (ADM666) Pins (GND – 0 (ADM663) Pin (GND – 0 (ADM666) Pin (GND – 0 +16.5 V Output Source Current (ADM663, ADM666) Pin (ADM663) Pin Output Sink Current, (ADM663, ADM666) Pin – ...

Page 3

... This is useful when powering liquid crystal displays over wide temperature ranges. The ADM666 has an additional comparator, C3 which com- pares the voltage on the Low Battery Input, LBI, pin to the in- ternal +1.3 V reference. The output from the comparator drives REV ...

Page 4

... SET Low Supply or Low Battery Detection The ADM666 contains on-chip circuitry for low power supply or battery detection. If the voltage on the LBI pin falls below the internal 1.3 V reference, then the open drain output LBO will go low. The low threshold voltage may be set to any voltage above 1 ...

Page 5

... A regulator’s minimum input-output differential or dropout voltage determines the lowest input voltage for a particular out- put voltage. The ADM663/ADM666 dropout voltage is 0 its rated output current. For example when used as a fixed +5 V regulator the minimum input voltage is +5 lower output ...

Page 6

... ADM663/ADM666 –Typical Performance Characteristics 0.01 0 100 FREQUENCY – Hz Figure 8. Power Supply Rejection Ratio vs. Frequency 2.0 1 +2V IN 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0 – mA OUT1 Figure 9. V Input-Output Differential vs. Output OUT1 Current 8-Lead Plastic DIP (N- 0.280 (7.11) PIN 1 0.240 (6.10 0.430 (10.92) 0.348 (8.84) ...

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