High Accuracy, Ultralow I
Q
, 1 A,
anyCAP
®
Low Dropout Regulator
ADP3338
FEATURES
High accuracy over line and load: ±0.8% @ 25°C,
±1.4% over temperature
Ultralow dropout voltage: 190 mV (typ) @ 1 A
Requires only C
O
= 1.0 µF for stability
anyCAP is stable with any type of capacitor (including MLCC)
Current and thermal limiting
Low noise
2.7 V to 8 V supply range
−40°C to +85°C ambient temperature range
SOT-223 package
IN
THERMAL
PROTECTION
FUNCTIONAL BLOCK DIAGRAM
Q1
OUT
ADP3338
CC
g
m
R1
DRIVER
R2
BANDGAP
REF
GND
APPLICATIONS
Notebook, palmtop computers
SCSI terminators
Battery-powered systems
Bar code scanners
Camcorders, cameras
Home entertainment systems
Networking systems
DSP/ASIC supplies
V
IN
1
µ
F
Figure 1.
ADP3338
IN
GND
OUT
V
OUT
1
µ
F
02050-002
Figure 2. Typical Application Circuit
GENERAL DESCRIPTION
The ADP3338 is a member of the ADP33xx family of precision,
low dropout (LDO), anyCAP voltage regulators. The ADP3338
operates with an input voltage range of 2.7 V to 8 V and delivers
a load current up to 1 A. The ADP3338 stands out from
conventional LDOs with a novel architecture and an enhanced
process that offers performance advantages and higher output
current than its competition. Its patented design requires only a
1 µF output capacitor for stability. This device is insensitive to
output capacitor equivalent series resistance (ESR), and is stable
with any good quality capacitor, including ceramic (MLCC)
types for space-restricted applications. The ADP3338 achieves
exceptional accuracy of ±0.8% at room temperature and ±1.4%
over temperature, line, and load variations. The dropout voltage
of the ADP3338 is only 190 mV (typical) at 1 A. The device also
includes a safety current limit and thermal overload protection.
The ADP3338 has ultralow quiescent current: 110 µA (typical)
in light load situations.
Rev. B
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 that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2005 Analog Devices, Inc. All rights reserved.
02050-001
ADP3338
TABLE OF CONTENTS
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
ESD Caution.................................................................................. 4
Pin Configuration and Function Descriptions............................. 5
Typical Performance Characteristics ............................................. 6
Theory of Operation ........................................................................ 9
Application Information................................................................ 10
Capacitor Selection .................................................................... 10
Output Current Limit ................................................................ 10
Thermal Overload Protection .................................................. 10
Calculating Power Dissipation ................................................. 10
Printed Circuit Board Layout Considerations ....................... 10
Outline Dimensions ....................................................................... 12
Ordering Guide .......................................................................... 13
REVISION HISTORY
6/05—Data Sheet Changed from Rev. A to Rev. B
Added Pin Function Descriptions Table ....................................... 5
Changes to Ordering Guide .......................................................... 13
6/04—Data Sheet Changed from Rev. 0 to Rev. A
Updated Format..............................................................Universal
Changes to Figures 5, 11, 12, 13, 14, 15 ..................................... 6
Updated Outline Dimensions ................................................... 12
Changes to Ordering Guide ...................................................... 12
6/01—Rev. 0: Initial Version
Rev. B | Page 2 of 16
ADP3338
SPECIFICATIONS
V
IN
= 6.0 V, C
IN
= C
OUT
= 1 µF, T
J
= −40°C to +125°C, unless otherwise noted.
Table 1.
Parameter
1, 2, 3
OUTPUT
Voltage Accuracy
Symbol
V
OUT
Conditions
V
IN
= V
OUTNOM
+ 0.4 V to 8 V, I
L
= 0.1 mA to 1 A, T
J
= 25°C
V
IN
= V
OUTNOM
+ 0.4 V to 8 V, I
L
= 0.1 mA to 1 A, T
J
= −40°C to +125°C
V
IN
= V
OUTNOM
+ 0.4 V to 8 V, I
L
= 50 mA to 1 A, T
J
= 150°C
V
IN
= V
OUTNOM
+ 0.4 V to 8 V, T
J
= 25°C
I
L
= 0.1 mA to 1 A, T
J
= 25°C
V
OUT
= 98% of V
OUTNOM
I
L
= 1 A
I
L
= 500 mA
I
L
= 100 mA
V
IN
= V
OUTNOM
+ 1 V
f = 10 Hz to 100 kHz, C
L
= 10 µF, I
L
= 1 A
I
L
= 1 A
I
L
= 500 mA
I
L
= 100 mA
I
L
= 0.1 mA
V
IN
= V
OUTNOM
– 100 mV, I
L
= 0.1 mA
Min
−0.8
−1.4
−1.6
0.04
0.006
190
125
70
1.6
95
9
4.5
0.9
110
190
400
200
150
Typ
Max
+0.8
+1.4
+1.6
Unit
%
%
%
mV/V
mV/mA
mV
mV
mV
A
µV rms
mA
mA
mA
µA
µA
Line Regulation
Load Regulation
Dropout Voltage
V
DROP
Peak Load Current
Output Noise
GROUND CURRENT
In Regulation
I
LDPK
V
NOISE
I
GND
In Dropout
1
2
I
GND
30
15
3
190
600
All limits at temperature extremes are guaranteed via correlation using standard statistical quality control (SQC) methods.
Application stable with no load.
3
V
IN
= 2.7 V for models with V
OUTNOM
≤ 2.2 V.
Rev. B | Page 3 of 16
ADP3338
ABSOLUTE MAXIMUM RATINGS
Unless otherwise specified, all voltages are referenced to GND.
Table 2.
Parameter
Input Supply Voltage
Power Dissipation
Operating Ambient Temperature Range
Operating Junction Temperature Range
θ
JA
θ
JC
Storage Temperature Range
Lead Temperature (Soldering 10 sec)
Vapor Phase (60 sec)
Infrared (15 sec)
Rating
−0.3 V to +8.5 V
Internally limited
−40°C to +85°C
−40°C to +150°C
62.3°C/W
26.8°C/W
−65°C to +150°C
300°C
215°C
220°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Only one absolute maximum rating may be applied at any one
time.
ESD 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 this product 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.
Rev. B | Page 4 of 16
ADP3338
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
3
IN
ADP3338
OUT
2
TOP VIEW
2
OUT
(Not to Scale)
1
GND
NOTE: PIN 2 AND TAB ARE INTERNALLY CONNECTED
Figure 3. Pin Configuration
Table 3. Pin Function Descriptions
Pin No.
1
2
3
Mnemonic
GND
OUT
IN
Description
Ground Pin.
Regulator Output. Bypass to ground with a 1 µF or larger capacitor.
Regulator Input. Bypass to ground with a 1 µF or larger capacitor.
Rev. B | Page 5 of 16
02050-003
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