anyCAP
®
100 mA
Low Dropout Linear Regulator
ADP3309
FEATURES
±1.2% accuracy over line and load regulations @ 25°C
Ultralow dropout voltage: 120 mV typical @ 100 mA
Requires only C
OUT
= 0.47 μF for stability
anyCAP LDOs are stable with all types of capacitors
(including MLCC)
Current and thermal limiting
Low noise
Low shutdown current: 1 μA
2.8 V to 12 V supply range
−20°C to +85°C ambient temperature range
Several fixed voltage options
Ultrasmall 5-lead SOT-23 package
Excellent line and load regulations
IN
ERR/NC
Q2
SD
BANDGAP
REF
00141-001
FUNCTIONAL BLOCK DIAGRAM
Q1
THERMAL
PROTECTION
DRIVER
CC
g
m
R2
ADP3309
R1
OUT
GND
Figure 1.
APPLICATIONS
Cellular telephones
Notebook, palmtop computers
Battery-powered systems
PCMCIA regulator
Bar code scanners
Camcorders, cameras
GENERAL DESCRIPTION
The ADP3309 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 LP2981, but offers
performance advantages. The ADP3309 stands out from
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 equivalent series resistance (ESR)
value, including ceramic types for space restricted applications.
The ADP3309 achieves ±1.2% accuracy at room temperature
and ±2.2% overall accuracy over temperature, line, and load
regulations. The dropout voltage of the ADP3309 is only
120 mV (typical) at 100 mA. This device also includes a current
limit and a shutdown feature. In shutdown mode, the ground
current is reduced to ~1 μA.
The ADP3309 operates with a wide input voltage range from
2.8 V to 12 V and delivers a load current in excess of 100 mA.
The ADP3309 anyCAP LDO offers a wide range of output
voltages.
ERR/NC
4
ADP3309-3.3
V
IN
C1 +
0.47µF –
1
IN
3
OUT
5
2
V
OUT
= 3.3V
+
–
C2
0.47µF
ON
00141-002
OFF
SD
GND
Figure 2. Typical Application Circuit
Rev. C
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
©2006 Analog Devices, Inc. All rights reserved.
ADP3309
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
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: anyCAP.................................................... 10
Thermal Overload Protection .................................................. 10
Calculating Junction Temperature........................................... 10
Printed Circuit Board Layout Consideration ......................... 10
Shutdown Mode ......................................................................... 10
Error Flag Dropout Detector .................................................... 10
Application Circuits ....................................................................... 11
Crossover Switch ........................................................................ 11
Higher Output Current ............................................................. 11
Constant Dropout Post Regulator............................................ 11
Outline Dimensions ....................................................................... 12
Ordering Guide .......................................................................... 12
REVISION HISTORY
12/06—Rev. B to Rev. C
Change to Table 1 ............................................................................. 3
Updated Outline Dimensions ....................................................... 12
Changes to the Ordering Guide.................................................... 12
7/04—Rev. A to Rev. B.
Changes to the Ordering Guide...................................................... 3
Updated Outline Dimensions ......................................................... 8
12/00—Rev. 0 to Rev. A
9/98—Revision 0: Initial Version
Rev. C | Page 2 of 12
ADP3309
SPECIFICATIONS
@ T
A
= −20°C to +85°C, V
IN
= 7 V, C
IN
= 0.47 μF, C
OUT
= 0.47 μF, unless otherwise noted.
1
The following specifications apply to all voltage
options.
Table 1.
Parameter
Output Voltage Accuracy
Symbol
V
OUT
Conditions
V
IN
= V
OUTNOM
+ 0.3 V to 12 V,
I
L
= 0.1 mA to 100 mA, T
A
= 25°C
V
IN
= V
OUTNOM
+ 0.3 V to 12 V,
I
L
= 0.1 mA to 100 mA
V
IN
= V
OUTNOM
+ 0.3 V to 12 V,
T
A
= 25°C
Min
−1.2
−2.2
Typ
Max
+1.2
+2.2
Unit
%
%
Line Regulation
ΔV
OUT
ΔV
IN
ΔV
OUT
ΔI
L
I
GND
I
GND
V
DROP
0.02
0.06
0.8
0.19
0.9
0.12
0.025
0.004
2.0
0.3
1
9
0.005
0.01
1
3
2
4
13
0.3
2.0
0.3
1.7
0.25
0.07
0.015
mV/V
mV/mA
mA
mA
mA
V
V
V
V
V
μA
μA
μA
μA
μA
μA
μA
V
mA
μV rms
Load Regulation
Ground Current
Ground Current in Dropout
Dropout Voltage
I
L
= 0.1 mA to 100 mA, T
A
= 25°C
I
L
= 100 mA
I
L
= 0.1 mA
V
IN
= 2.4 V, I
L
= 0.1 mA
V
OUT
= 98% of V
OUTNOM
I
L
= 100 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
V
EO
= 5 V
I
SINK
= 400 μA
V
IN
= V
OUTNOM
+ 1 V, T
A
= 25°C
f = 10 Hz to 100 kHz
Shutdown Threshold
Shutdown Pin Input Current
Ground Current in Shutdown Mode
Output Current in Shutdown Mode
Error Pin Output Leakage
Error Pin Output Low Voltage
Peak Load Current
Output Noise @ 5 V Input
1
V
THSD
I
SDIN
I
Q
I
OSD
I
EL
V
EOL
I
LDPK
V
NOISE
0.12
150
100
Ambient temperature of 85°C corresponds to a junction temperature of 125°C under typical full load test conditions.
Rev. C | Page 3 of 12
ADP3309
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Input Supply Voltage
Shutdown Input 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 +16 V
−0.3 V to +16 V
Internally Limited
−55°C to +125°C
−55°C to +125°C
190°C/W
92°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.
ESD CAUTION
Rev. C | Page 4 of 12
ADP3309
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
IN
1
GND
2
SD
3
ADP3309
TOP VIEW
(Not to Scale)
5
OUT
NC = NO CONNECT
Figure 3. Pin Configuration
Table 3. Pin Function Descriptions
Pin No.
1
2
3
Mnemonic
IN
GND
SD
Description
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. This pin can be left
open. (NC = No Connect).
Output of the Regulator. Fixed 2.5 V, 2.7 V, 2.85 V, 2.9 V, 3.0 V, 3.3 V, or 3.6 V output voltage. Bypass to ground with
a 0.47 μF or larger capacitor.
4
5
ERR/NC
OUT
Rev. C | Page 5 of 12
00141-003
3
ERR/NC
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