a
FEATURES
1.2% Accuracy Over Line and Load Regulations
@ 25 C
Ultralow Dropout Voltage: 80 mV Typical @ 50 mA
Requires Only C
O
= 0.47 F for Stability
anyCAP = Stable with All Types of Capacitors
(Including MLCC)
Current and Thermal Limiting
Low Noise
Low Shutdown Current: 1 A
3.0 V to 12 V Supply Range
–20 C to +85 C Ambient Temperature Range
Several Fixed Voltage Options
Ultrasmall SOT-23-5 Package
Excellent Line and Load Regulations
APPLICATIONS
Cellular Telephones
Notebook, Palmtop Computers
Battery Powered Systems
PCMCIA Regulator
Bar Code Scanners
Camcorders, Cameras
GENERAL DESCRIPTION
anyCAP™ 50 mA
Low Dropout Linear Regulator
ADP3308
FUNCTIONAL BLOCK DIAGRAM
Q1
THERMAL
PROTECTION
IN
OUT
ADP3308
CC
DRIVER
Gm
R2
R1
ERR/NC
Q2
SD
BANDGAP
REF
GND
The ADP3308 is a member of the ADP330x family of precision
low dropout anyCAP voltage regulators. It is pin-for-pin and
functionally compatible with National’s LP2980, but offers
performance advantages. The ADP3308 stands out from the
conventional LDOs with a novel architecture and an enhanced
process. Its patented design requires only a 0.47
µF
output
capacitor for stability. This device is stable with any type of
capacitor regardless of its ESR (Equivalent Serial Resistance)
value, including ceramic types for space restricted applications.
The ADP3308 achieves
±
1.2% accuracy at room temperature
and
±
2.2% overall accuracy over temperature, line and load
regulations. The dropout voltage of the ADP3308 is only
80 mV (typical) at 50 mA. This device also includes a current
limit and a shutdown feature. In shutdown mode, the ground
current is reduced to ~1
µA.
The ADP3308 operates with a wide input voltage range from
3.0 V to 12 V and delivers a load current in excess of 100 mA.
The ADP3308 anyCAP LDO offers a wide range of output
voltages. For 100 mA version, refer to the ADP3309 data sheet.
ERR/NC
4
ADP3308-3.3
V
IN
C1
0.47 F
3
ON
OFF
SD
GND
2
1 IN
OUT 5
C2
0.47 F
V
OUT
= +3.3V
Figure 1. Typical Application Circuit
anyCAP is a trademark of Analog Devices, Inc.
REV. A
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: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1998
ADP3308-xx–SPECIFICATIONS
Parameter
OUTPUT VOLTAGE ACCURACY
Symbol
V
OUT
(@T
A
= –20 C to +85 C, V
IN
= 7 V, C
IN
= 0.47 F, C
OUT
= 0.47 F, unless
otherwise noted.)
1
The following specifications apply to all voltage options.
Min
Typ
Max
Units
Conditions
V
IN
= V
OUTNOM
+ 0.3 V to 12 V
I
L
= 0.1 mA to 50 mA
T
A
= +25°C
V
IN
= V
OUTNOM
+ 0.3 V to 12 V
I
L
= 0.1 mA to 50 mA
V
IN
= V
OUTNOM
+ 0.3 V to 12 V
T
A
= +25°C
I
L
= 0.1 mA to 50 mA
T
A
= +25°C
I
L
= 50 mA
I
L
= 0.1 mA
V
IN
= 2.4 V
I
L
= 0.1 mA
V
OUT
= 98% of V
OUTNOM
I
L
= 50 mA
I
L
= 10 mA
I
L
= 1 mA
ON
OFF
0 < V
SD
≤
5 V
5 < V
SD
≤
12 V @ V
IN
= 12 V
V
SD
= 0 V, V
IN
= 12 V
T
A
= +25°C
V
SD
= 0 V, V
IN
= 12 V
T
A
= +85°C
T
A
= +25°C @ V
IN
= 12 V
T
A
= +85°C @ V
IN
= 12 V
–1.2
–2.2
0.02
0.06
0.54
0.19
0.9
0.08
0.025
0.004
2.0
0.75
0.75
+1.2
+2.2
%
%
mV/V
mV/mA
LINE REGULATION
LOAD REGULATION
GROUND CURRENT
GROUND CURRENT IN DROPOUT
DROPOUT VOLTAGE
∆V
O
∆V
IN
∆V
O
∆
I
L
I
GND
I
GND
V
DROP
1.4
0.3
1.7
0.17
0.07
0.030
0.3
1
9
mA
mA
mA
V
V
V
V
V
µA
µA
µA
µA
µA
µA
µA
V
mA
µV
rms
SHUTDOWN THRESHOLD
SHUTDOWN PIN INPUT CURRENT
V
THSD
I
SDIN
GROUND CURRENT IN SHUTDOWN I
Q
MODE
0.005
0.01
1
3
2
4
13
OUTPUT CURRENT IN SHUTDOWN
MODE
ERROR PIN OUTPUT LEAKAGE
ERROR PIN OUTPUT
“LOW” VOLTAGE
PEAK LOAD CURRENT
OUTPUT NOISE @ 5 V OUTPUT
I
OSD
I
EL
V
EOL
I
LDPK
V
NOISE
I
SINK
= 400
µA
V
IN
= V
OUTNOM
+ 1 V, T
A
= +25°C
f = 10 Hz–100 kHz
0.12
150
100
0.3
NOTES
1
Ambient temperature of +85°C corresponds to a junction temperature of +125°C under typical full load test conditions.
Specifications subject to change without notice.
–2–
REV. A
ADP3308
ABSOLUTE MAXIMUM RATINGS*
PIN FUNCTION DESCRIPTIONS
Input Supply Voltage . . . . . . . . . . . . . . . . . . . –0.3 V to +16 V
Shutdown Input Voltage . . . . . . . . . . . . . . . . –0.3 V to +16 V
Power Dissipation . . . . . . . . . . . . . . . . . . . . Internally Limited
Operating Ambient Temperature Range . . . –55°C to +125°C
Operating Junction Temperature Range . . . –55°C to +125°C
θ
JA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165°C/W
θ
JC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92°C/W
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Lead Temperature Range (Soldering 10 sec) . . . . . . . . +300°C
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . +220°C
*This is a stress rating only; operation beyond these limits can cause the device to
be permanently damaged.
Pin Name
1
2
3
IN
GND
SD
Function
Regulator Input.
Ground Pin.
Active Low Shutdown Pin. Connect to
ground to disable the regulator output.
When shutdown is not used, this pin
should be connected to the input pin.
Open Collector. Output that goes low
to indicate the output is about to go out
of regulation or no connect.
Output of the Regulator, fixed 2.7, 2.85,
2.9, 3.0, 3.3, or 3.6 volts output voltage.
Bypass to ground with a 0.47
µF
or larger
capacitor.
PIN CONFIGURATION
IN
1
5 OUT
4
ERR/NC
5
OUT
ORDERING GUIDE
Model
ADP3308ART-2.7
ADP3308ART-2.85
ADP3308ART-2.9
ADP3308ART-3
ADP3308ART-3.3
ADP3308ART-3.6
Voltage
Output
2.7 V
2.85 V
2.9 V
3.0 V
3.3 V
3.6 V
Package
Option*
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
Marking
Code
DAC
DJC
DKC
DCC
DEC
DFC
GND 2
SD
ADP3308
TOP VIEW
3 (Not to Scale) 4
ERR/NC
NC = NO CONNECT
*SOT = Surface Mount.
Contact the factory for the availability of other output voltage options.
Other Member of anyCAP Family
1
Model
ADP3309
Output Current
100 mA
Package Option
2
SOT-23-5 Lead
NOTES
1
See individual data sheet for detailed ordering information.
2
SOT = Surface Mount.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the ADP3308 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
REV. A
–3–
ADP3308–Typical Performance Characteristics
3.302
I
L
= 0mA
3.301
OUTPUT VOLTAGE – Volts
OUTPUT VOLTAGE – Volts
3.300
3.299
V
OUT
= 3.3V
3.298
3.297
3.296
3.295
3.3 4
I
L
= 50mA
I
L
= 10mA
3.302
3.301
3.300
3.299
3.298
3.297
3.296
3.295
5
6 7 8 9 10 11 12 13 14
INPUT VOLTAGE – Volts
1150
V
OUT
= 3.3V
V
IN
= 7V
GROUND CURRENT – A
V
OUT
= 3.3V
I
L
= 0mA
900
650
400
160
0
8
16 24 32 40 48 56 64 72 80
OUTPUT LOAD – mA
0
0
1.2 2.4 3.6 4.8 6.0 7.2 8.4 9.6 10.8 12.0
INPUT VOLTAGE – Volts
Figure 2. Line Regulation: Output
Voltage vs. Supply Voltage
Figure 3. Output Voltage vs. Load
Current
Figure 4. Quiescent Current vs.
Supply Voltage
800
0.2
0.1
GROUND CURRENT – A
OUTPUT VOLTAGE – %
700
V
IN
= 7V
600
GROUND CURRENT – A
675
0.0
–0.1
–0.2
I
L
= 30mA
I
L
= 0mA
500
400
300
200
100
0
–45 –25 –5
I
L
= 50mA
550
425
I
L
= 0 TO 80mA
300
I
L
= 50mA
–0.3
–0.4
–45 –25 –5
I
L
= 0mA
175
0
20
40
60
OUTPUT LOAD – mA
80
15 35 55 75 95 115 135
TEMPERATURE – C
15 35 55 75 95 115 135
TEMPERATURE – C
Figure 5. Quiescent Current vs. Load
Current
Figure 6. Output Voltage Variation %
vs. Temperature
Figure 7. Quiescent Current vs.
Temperature
120
5
8.0
INPUT/OUTPUT VOLTAGE – Volts
INPUT/OUTPUT VOLTAGE – Volts
INPUT/OUTPUT VOLTAGE – mV
V
OUT
= 3.3V
R
L
= 66
4
V
IN
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
0
V
SD
= V
IN
C
L
= 0.47 F
R
L
= 66
V
OUT
= 3.3V
20 40 60 80 100 120 140 160 180 200
TIME – s
V
OUT
96
72
3
48
2
24
1
0
0
20
40
60
OUTPUT LOAD – mA
80
0
0
1
3
2
4
3
2
INPUT VOLTAGE – Volts
1
0
Figure 8. Dropout Voltage vs. Output
Current
Figure 9. Power-Up/Power-Down
Figure 10. Power-Up Overshoot
–4–
REV. A
ADP3308
3.320
3.310
3.300
3.290
V
OUT
= 3.3V
3.320
V
OUT
= 3.3V
3.310
Volts
3.320
3.310
3.300
3.290
V
OUT
= 3.3V
C
L
= 0.47 F
3.300
3.290
Volts
Volts
3.280
R
L
= 66
C
L
= 0.47 F
3.280
R
L
= 3.3k
C
L
= 0.47 F
3.280
V
IN
7.5
7.0
mA
7.5
7.0
0
40 80 120 160 200 240 280 320 360 400
TIME – s
V
IN
100
10
I
OUT
0
20 40 60 80 100 120 140 160 180 200
TIME – s
0
100
200
300
TIME – s
400
500
Figure 11. Line Transient Response
Figure 12. Line Transient Response
Figure 13. Load Transient
Volts
3.320
3.310
Volts
V
OUT
= 3.3V
C
L
= 4.7 F
3.3
0
V
OUT
= 3.3V
V
OUT
4
C
L
= 0.47 F
3
3.3V
2
C
L
= 4.7 F
Volts
V
OUT
3.300
200
3.290
150
mA
1
0
+3
0
3.280
100
mA
100
50
0
0
1
2
3
TIME – s
I
OUT
V
OUT
= 3.3V
R
L
= 66
I
OUT
V
SD
+3V
10
0
100
200
300
TIME – s
400
500
4
5
0
20
40
60
TIME – s
80
100
Figure 14. Load Transient
Figure 15. Short Circuit Current
Figure 16. Turn On
V/
Hz
4
3.3V
3
2
1
0
V
OUT
= 3.3V
R
L
= 66
C
L
= 0.47 F
0
–10
RIPPLE REJECTION – dB
b
–30
–40
–50
–60
–70
–80
–90
VOLTAGE NOISE SPECTRAL DENSITY –
–20
a. 0.47 F, R
L
= 3.3k
b. 0.47 F, R
L
= 66
c. 4.7 F, R
L
= 3.3k
d. 4.7 F, R
L
= 66
V
OUT
= +3.3V
10
V
OUT
= 3.3V
C
L
= 0.47 F
I
L
= 1mA
1
Volts
a
c
d
b d
0.1
3
0
V
SD
0
20
40
60
TIME – s
80
100
–100
10
a c
100
1k
10k 100k
FREQUENCY – Hz
1M
10M
0.01
100
1k
10k
FREQUENCY – Hz
100k
Figure 17. Turn Off
Figure 18. Power Supply Ripple
Rejection
Figure 19. Output Noise Density
REV. A
–5–
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