Tri-Mode: +3.3 V, +5 V, Adjustable
a
Micropower Linear Voltage Regulators
FEATURES
Tri-Mode Operation
3.3 V, 5 V Fixed or +1.3 V to +16 V Adjustable
Low Power CMOS: 9 µA max Quiescent Current
High Current 100 mA Output
Low Dropout Voltage
Upgrade for ADM663/ADM666
“Small” 0.1 µF Output Capacitor (0805 Style)
+2 V to +16.5 V Operating Range
Low Battery Detector ADM666A
No Overshoot on Power-Up
Thermal Shutdown
APPLICATIONS
Handheld Instruments
LCD Display Systems
Pagers
Battery Operated Equipment
GENERAL DESCRIPTION
The ADM663A/ADM666A are precision linear voltage regulators featuring a maximum quiescent current of 9 µA. They can
be used to give a fixed +3.3 V or +5 V output with no additional
external components 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
input. The low quiescent cur-
SET
rent makes these devices especially suitable for battery powered
systems. The input voltage range is 2 V to 16.5 V, and an output current up to 100 mA is provided. Current limiting may be
set using a single external resistor. For additional safety, an
internal thermal shutdown circuit monitors the internal die
temperature.
The ADM666A features additional low battery monitoring circuitry to detect for low battery voltages.
The ADM663A/ADM666A are pin compatible enhancements
for the ADM663/ADM666. Improvements include an additional 3.3 V output range, higher output current, and operation
with a small output capacitor.
The ADM663A/ADM666A are available in an 8-pin DIP and
narrow surface mount (SOIC) packages.
ADM663A/ADM666A*
FUNCTIONAL BLOCK DIAGRAMS
V
IN
1.3V
A1
D
E
1.3 V
C
O
D
E
R
0.9V
ADM663A
D
E
C
O
D
E
R
1.3V
ADM666A
SHDN
GND
V
SHDN
GND
R1
R2
R3
IN
A1
R1
R2
R3
C1
C2
C3
A2
C1
C2
C3
C4
VIN–50mV
50mV
VIN–50mV
50mV
0.5V
0.5V
V
OUT2
V
OUT1
SENSE
V
SET
V
TC
V
OUT
SENSE
V
SET
LBI
LBO
*Patent pending.
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.
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700 Fax: 617/326-8703
ADM663A/ADM666A–SPECIFICATIONS
(VIN = +9 V, TA = T
MIN
to T
, unless otherwise noted)
MAX
Parameter Min Typ Max Units Test Conditions/Comments
Input Voltage, V
Quiescent Current, I
Output Voltage, V
Output Voltage, V
Dropout Voltage, V
Dropout Voltage, V
Line Regulation (∆V
IN
Q
(+5 V Mode) 4.75 5.0 5.25 V V
OUT(2)
(+3.3 V Mode) 3.135 3.3 3.465 V V
OUT(2)
DO
DO
/∆VIN) 0.03 0.35 %/V +2 V ≤ VIN ≤ +15 V, V
OUT(2)
Load Regulation VIN = (V
∆V
∆V
Reference Voltage, V
Reference Tempco (∆V
V
SET
V
F/A
V
F/A
V
SET
Shutdown Input Voltage, V
Shutdown Input Current, I
SENSE Input Threshold, V
SENSE Input Resistance, R
Input-Output Saturation Resistance, R
ADM663A, V
Output Current, I
Minimum Load Current, I
OUT(2)
OUT1
;(∆V
;(∆V
OUT(2)
OUT1
/∆I
/∆I
OUT1
SET
) 0.3 1.0 Ω V
OUT(2)
) 0.25 1.2 Ω ADM663A, 50 µA ≤ I
/∆T) ±100 ppm/°C
SET
Internal Threshold
Low 50 mV V
High VIN – 50 mV V
Input Current, I
OUT1
OUT(2)
SET
SHDN
SHDN
OUT
SENSE
L (MIN)
– V
SENSE
SAT
2.0 16.5 V
69 µA No Load, V
0.75 0.9 V I
1.0 1.2 V I
0.15 0.35 Ω V
0.15 0.30 Ω V
1.27 1.33 V T
= GND
SET
= V
SET
= 40 mA, V
OUT
= 100 mA, V
OUT
= GND (Fixed +5 V Output)
SET
= VIN (Fixed +3.3 V Output)
SET
= Resistive Divider (Adjustable Output)
SET
= +25°C, V
A
< V
SET
> V
SET
= +16.5 V
IN
IN
+3 V), 1 mA ≤ I
OUT
Low for +5 V Output
F/A
High for +3.3 V Output
F/A
OUT
OUT
OUT
= V
= +14.5 V
= +14.5 V
OUT
OUT1
SET
±0.01 ±10 nA
1.4 V V
0.3 V V
High = Output Off
SHDN
Low = Output On
SHDN
±0.01 ±10 nA
0.5 V Current Limit Threshold
3MΩ
200 400 Ω V
20 40 Ω V
20 30 Ω V
= +2 V, I
IN
= +9 V, I
IN
= +15 V, I
IN
= 1 mA
OUT
= 10 mA
OUT
OUT
= 10 mA
100 mA +3 V ≤ VIN ≤ +16.5 V, V
1.0 µA
IN
LBI Input Threshold
Low Going 1.1 1.26 V ADM666A
High Going 1.29 1.42 V ADM666A
Hysteresis 30 mV ADM666A
LBI Input Current, I
LBO Output Saturation Resistance, R
LBI
SAT
±0.01 ±10 nA ADM666A
20 30 Ω ADM666A, I
= 2 mA
SAT
LBO Output Leakage Current 0.2 nA ADM666A, LBI = 1.4 V
V
Open Circuit Voltage, V
TC
V
Sink Current, I
TC
V
Temperature Coefficient +2.5 mV/°C ADM663A
TC
Specifications subject to change without notice.
TC
TC
0.9 V ADM663A
8.0 2.0 mA ADM663A
= V
REF
OUT(2)
≤ 10 mA
– V
= +1.5 V
OUT
≤ 100 mA
ABSOLUTE MAXIMUM RATINGS*
(TA = +25°C unless otherwise noted)
Input Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +18 V
Terminal Voltage
(ADM663A) Pins 1, 3, 5, 6, 7
. . . . . . . . . . . . . . . . . . . . . . (GND
– 0.3 V) to (VIN + 0.3 V)
(ADM666A) Pins 1, 2, 3, 5, 6
. . . . . . . . . . . . . . . . . . . . . . . (GND
(ADM663A) Pin 2 . . . . . . . . (GND – 0.3 V) to (V
(ADM666A) Pin 7 . . . . . . . . . . . . . . (GND
– 0.3 V) to (VIN + 0.3 V)
– 0.3 V) to +16.5 V
OUT1
+ 0.3 V)
Output Source Current
(ADM663A, ADM666A) Pin 2 . . . . . . . . . . . . . . . . . . 100 mA
(ADM663A) Pin 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 mA
Output Sink Current, Pin 7 . . . . . . . . . . . . . . . . . . . . . .–20 mA
Power Dissipation, N-8 . . . . . . . . . . . . . . . . . . . . . . . . 800 mW
(Derate 8.3 mW/°C above +30°C)
θ
, Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . 120°C/W
JA
Power Dissipation, R-8 . . . . . . . . . . . . . . . . . . . . . . . .570 mW
(Derate 6 mW/°C above +30°C)
θ
, Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 170°C/W
JA
Operating Temperature Range
Industrial (A Version) . . . . . . . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . +300°C
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . +220°C
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .>5000 V
*This is a stress rating only and functional operation of the device at these or any
other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended
periods of time may affect reliability.
–2–
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ADM663A/ADM666A
PIN FUNCTION DESCRIPTION
Mnemonic Function
V
OUT(1) (2)
V
IN
Voltage Regulator Output(s).
Voltage Regulator Input.
SENSE Current Limit Sense Input. (Referenced to
V
V
) If not used, it should be connected to
OUT(2).
OUT(2).
GND Ground Pin. Must be connected to 0 V.
LBI Low Battery Detect Input. Compared with 1.3 V.
LBO Low Battery Detect Output. Open Drain Output.
SHDN Digital Input. May be used to disable the device
so that the power consumption is minimized.
V
SET
Voltage Setting Input. Connect to GND for
+5 V output, to V
for +3.3 V output or
IN
connect to external resistive divider for
adjustable output.
V
TC
Temperature-Proportional Voltage for negative
TC Output.
PIN CONFIGURATIONS
DIP & SOIC
SENSE
V
OUT2
V
OUT1
GND
1
2
ADM663A
TOP VIEW
3
(Not to Scale)
4
V
8
IN
7
V
TC
6
V
SET
5
SHDN
DIP & SOIC
TERMINOLOGY
Dropout Voltage: The input/output voltage differential at
which the regulator no longer maintains regulation against further reductions in input voltage. It is measured when the output
decreases 100 mV from its nominal value. The nominal value is
the measured value with V
IN
= V
OUT
+2 V.
Line Regulation: The change in output voltage as a result of
a change in the input voltage. It is specified as a percentage
change in output voltage for an input voltage change.
∆V
OUT
Line Reg =
V
OUT
∆V
(100)
IN
Load Regulation: The change in output voltage for a change
in output current.
∆V
Load Reg (Ω) =
∆I
OUT
OUT
Quiescent Current: The input bias current which flows when
the regulator output is unloaded or when the regulator is in
shutdown.
Sense Input Threshold: Current limit sense voltage. This
is the voltage (referenced to V
) at which current limiting
OUT(2)
occurs.
Input-Output Saturation Resistance (ADM663A): This is a
measure of the internal MOS transistor effective resistance in series with V
. The minimum input-output voltage differential
OUT1
at low currents may be calculated by multiplying the load current by the saturation resistance.
Thermal Limiting: This feature monitors the internal die temperature and disables the output when an internal temperature
of 125°C is reached.
Maximum Power Dissipation: The maximum total device
dissipation for which the regulator will continue to operate
within specifications.
SENSE
V
OUT
LBI
GND
1
2
ADM666A
TOP VIEW
3
(Not to Scale)
4
8
V
IN
7
LBO
6
V
SET
5
SHDN
ORDERING GUIDE
Temperature Package
Model Range Option
ADM663AAN –40°C to +85°C N-8
ADM663AAR –40°C to +85°C R-8
ADM666AAN –40°C to +85°C N-8
ADM666AAR –40°C to +85°C R-8
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