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High Accuracy, Ultralow IQ, 1.5 A, anyCAP(R) Low Dropout Regulator ADP3339
FEATURES
High accuracy over line and load: 0.9% @ 25C, 1.5% over temperature Ultralow dropout voltage: 230 mV (typ) @ 1.5 A Requires only CO = 1.0 F for stability anyCAP = stable with any type of capacitor (including MLCC) Current and thermal limiting Low noise 2.8 V to 6 V supply range -40C to +85C ambient temperature range SOT-223 package
IN THERMAL PROTECTION
FUNCTIONAL BLOCK DIAGRAM
Q1 OUT
ADP3339
CC gm
R1
DRIVER
R2
02191-0-001
BANDGAP REF
GND
APPLICATIONS
Notebook, palmtop computers SCSI terminators Battery-powered systems PCMCIA regulators Bar code scanners Camcorders, cameras
VIN 1F
Figure 1.
ADP3339
IN GND
OUT
VOUT
02191-0-002
1F
Figure 2. Typical Application Circuit
GENERAL DESCRIPTION
The ADP3339 is a member of the ADP33xx family of precision, low dropout, anyCAP voltage regulators. The ADP3339 operates with an input voltage range of 2.8 V to 6 V and delivers a load current up to 1.5 A. The ADP3339 stands out from the conventional LDOs with a novel architecture and an enhanced process that enables it to offer performance advantages and higher output current than its competition. Its patented design requires only a 1.0 F 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 ADP3339 achieves exceptional accuracy of 0.9% at room temperature and 1.5% over temperature, line, and load variations. The dropout voltage of the ADP3339 is only 230 mV (typical) at 1.5 A. The device also includes a safety current limit and thermal overload protection. The ADP3339 has ultralow quiescent current: 130 A (typical) in light load situations.
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 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: 781.326.8703 (c) 2004 Analog Devices, Inc. All rights reserved.
ADP3339 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 .......................................................................... 12
REVISION HISTORY
6/04--Data Sheet Changed from Rev. 0 to Rev. A Updated Format..............................................................Universal Changes to Table 1........................................................................ 3 Changes to Thermal Overload Protection Section ................ 10 Updated Outline Dimensions ................................................... 12 Changes to Ordering Guide ...................................................... 12 10/01-Revision 0: Initial Version
Rev. A | Page 2 of 12
ADP3339 SPECIFICATIONS1, 2
VIN = 6.0 V, CIN = COUT = 1 F, TJ =-40C to +125C, unless otherwise noted. Table 1.
Parameter OUTPUT Voltage Accuracy3 Symbol VOUT Conditions VIN = VOUTNOM + 0.5 V to 6 V, IL = 0.1 mA to 1.5 A, TJ = 25C VIN = VOUTNOM + 0.5 V to 6 V, IL = 0.1 mA to 1.5 A, TJ = -40C to +125C VIN = VOUTNOM + 0.5 V to 6 V, IL = 100 mA to 1.5 A, TJ = 150C VIN = VOUTNOM + 0.5 V to 6 V, TJ = 25C IL = 0.1 mA to 1.5 A, TJ= 25C VOUT = 98% of VOUTNOM IL = 1.5 A IL = 1 A IL = 500 mA IL = 100 mA VIN = VOUTNOM + 1 V f = 10 Hz-100 kHz, CL = 10 F, IL = 1.5 A IL = 1.5 A IL = 1 A IL = 500 mA IL = 100 mA IL = 0.1 mA VIN = VOUTNOM - 100 mV, IL = 0.1 mA Min -0.9 -1.5 -1.9 0.04 0.004 230 180 150 100 2.0 95 13 9 5 1 130 100 480 380 300 Typ Max +0.9 +1.5 +1.9 Unit % % % mV/V mV/mA mV mV mV mV A V rms mA mA mA mA A A
Line Regulation3 Load Regulation Dropout Voltage
VDROP
Peak Load Current Output Noise GROUND CURRENT In Regulation
ILDPK VNOISE IGND
In Dropout
IGND
40 25 15 3 200 300
1 2 3
All limits at temperature extremes are guaranteed via correlation using standard statistical quality control (SQC) methods. Application stable with no load. VIN = 2.8 V for models with VOUTNOM 2.3 V.
Rev. A | Page 3 of 12
ADP3339 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 JA Four-Layer Board JC Storage Temperature Range Lead Temperature Range (Soldering 10 sec) Vapor Phase (60 sec) Infrared (15 sec) Rating -0.3 V to +8.5 V Internally Limited -40C to +85C -40C to +150C 62.3C/W 26.8C/W -65C to +150C 300C 215C 220C
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 listed in the operational sections 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. A | Page 4 of 12
ADP3339 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADP3339
3 2
IN
02191-0-003
OUT
OUT TOP VIEW (Not to Scale) 1 GND
NOTE: PIN 2 AND TAB ARE INTERNALLY CONNECTED
Figure 3. 3-Lead SOT-223 Pin Configuration
Table 3. Pin Function Descriptions
Pin No. 1 2 3 Mnemonic GND OUT IN Function Ground Pin. Output of the Regulator. Bypass to Ground with a 1 F or larger capacitor. Regulator Input. Bypass to Ground with a 1 F or larger capacitor.
Rev. A | Page 5 of 12
ADP3339 TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25C unless otherwise noted.
3.301 3.300 ILOAD = 0A
14 12 VIN = 6V VOUT = 3.0V
VOUT = 3.3V
GROUND CURRENT (mA)
3.299
OUTPUT VOLTAGE (V)
10 8 6 4 2
3.298 ILOAD = 500mA 3.297 3.296 3.295 ILOAD = 1.5A 3.294
02191-0-004
ILOAD = 1A
3.293
0
3
4
5 INPUT VOLTAGE (V)
6
0
0.5 1.0 LOAD CURRENT (A)
1.5
Figure 4. Output Voltage vs. Input Voltage
Figure 7. Ground Current vs. Load Current
3.301
VIN = 6V
1.0
VIN = 6V VOUT = 3.3V 0.8
3.300 3.299 3.298 3.297 3.296 3.295
002191-0-005
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (%)
ILOAD = 1A
0.6
ILOAD = 10mA
0.4
0.2
ILOAD = 500mA
0
ILOAD = 1.5A
-0.2 -40
02191-0-008 02191-0-009
3.294
0 0.5 1.0 LOAD CURRENT (A) 1.5
-20
0
20 40 60 80 100 JUNCTION TEMPERATURE (C)
120
140
Figure 5. Output Voltage vs. Load Current
Figure 8. Output Voltage Variation % vs. Junction Temperature
180 160 140
GROUND CURRENT (A)
VOUT = 3.3V ILOAD = 0A
25 VOUT = 3.3V 20
GROUND CURRENT (mA)
ILOAD = 1.5A 15 ILOAD = 1A 10 ILOAD = 0.5A
120 100 80 60 40 20
5 ILOAD = 1mA
0
0 2 INPUT VOLTAGE (V) 4 6
02191-0-006
0 -40
110 10 60 JUNCTION TEMPERATURE (C)
160
Figure 6. Ground Current vs. Supply Voltage
Figure 9. Ground Current vs. Junction Temperature
Rev. A | Page 6 of 12
02191-0-007
ADP3339
250
VOUT = 3.3V
3.31
VOUT = 3.3V COUT = 10F ILOAD = 1.5A
200
3.30 3.29
DROPOUT (mV)
100
5
50
4
002191-0-013 02191-0-015
02191-0-014
0 0 0.2 0.4 0.6 0.8 1.0 LOAD CURRENT (mA) 1.2 1.4
02191-0-010
VOLTS
40
150
80
120 140 TIME (s)
180
220
Figure 10. Dropout Voltage vs. Load Current
Figure 13. Line Transient Response
VOUT = 3.3V ILOAD = 1.5A
3.5
VIN = 6V COUT = 10F
INPUT/OUTPUT VOLTAGE (V)
VOLTS 3 2 1 0 A
3.3 3.1 1.5 1.0 0.5
0
02191-0-011
0
1
2
3
4
5 6 TIME (s)
7
8
9
10
0
200
400
600 TIME (s)
800
1000
Figure 11. Power-Up/Power-Down
Figure 14. Load Transient Response
3.31 3.30 3.29
VOLTS
VOUT = 3.3V COUT = 1F ILOAD = 1.5A
3.5 3.3 3.1 1.5
VIN = 6V COUT = 1F
VOLTS
1.0
5 4
02191-0-012
A
0.5
0
40
80
120 140 TIME (s)
180
220
0
200
400
600 TIME (s)
800
1000
Figure 12. Line Transient Response
Figure 15. Load Transient Response
Rev. A | Page 7 of 12
ADP3339
VIN = 6V
600
VOLTS
3.3
500
0
3 2
RMS NOISE (V)
400
300 ILOAD = 1.5A 200
A
1 0
02191-0-016
100 ILOAD = 0A
0 200 400 600 TIME (s) 800 1000
0 0 10
20
CL (F)
30
40
50
Figure 16. Short-Circuit Current
Figure 18. RMS Noise vs. CL (10 Hz to 100 kHz)
VOUT = 3.3V -10 -20
VOLTAGE NOISE SPECTRAL DENSITY (V/ Hz)
0
100
10
RIPPLE REJECTION (dB)
-30 -40 -50 -60 -70 -80 -90
CL = 1F ILOAD = 1.5A CL = 10F ILOAD = 1.5A
1
CL = 1F
0.1
CL = 10F
02191-0-017
CL = 10F ILOAD = 0 C = 1F L ILOAD = 0
100 1k 10k FREQUENCY (Hz) 100k 1M
0.01
-100 10
0.001 10
100
10k 1k FREQUENCY (Hz)
100k
1M
Figure 17. Power Supply Ripple Rejection
Figure 19. Output Noise Density
Rev. A | Page 8 of 12
02191-0-019
02191-0-018
ADP3339 THEORY OF OPERATION
The ADP3339 anyCAP LDO uses a single control loop for regulation and reference functions. The output voltage is sensed by a resistive voltage divider, consisting of R1 and R2, which is varied to provide the available output voltage option. Feedback is taken from this network by way of a series diode (D1) and a second resistor divider (R3 and R4) to the input of an amplifier. A very high gain error amplifier is used to control this loop. The amplifier is constructed in such a way that equilibrium produces a large, temperature-proportional input offset voltage that is repeatable and very well controlled. The temperatureproportional offset voltage is combined with the complementary diode voltage to form a virtual band gap voltage that is implicit in the network, although it never appears explicitly in the circuit. Ultimately, this patented design makes it possible to control the loop with only one amplifier. This technique also improves the noise characteristics of the amplifier by providing more flexibility on the trade-off of noise sources that leads to a low noise design. The R1, R2 divider is chosen in the same ratio as the band gap voltage to the output voltage. Although the R1, R2 resistor divider is loaded by diode D1 and a second divider consisting of R3 and R4, the values can be chosen to produce a temperaturestable output. This unique arrangement specifically corrects for the loading of the divider, thus avoiding the error resulting from base current loading in conventional circuits. The patented amplifier controls a new and unique noninverting driver that drives the pass transistor, Q1. The use of this special noninverting driver enables the frequency compensation to include the load capacitor in a pole-splitting arrangement to achieve reduced sensitivity to the value, type, and ESR of the load capacitance. Most LDOs place very strict requirements on the range of ESR values for the output capacitor because they are difficult to stabilize due to the uncertainty of load capacitance and resistance. Moreover, the ESR value required to keep conventional LDOs stable changes depending on load and temperature. These ESR limitations make designing with LDOs more difficult because of their unclear specifications and extreme variations over temperature. With the ADP3339 anyCAP LDO, this is no longer true. It can be used with virtually any good quality capacitor, with no constraint on the minimum ESR. This innovative design allows the circuit to be stable with just a small 1 F capacitor on the output. Additional advantages of the pole-splitting scheme include superior line noise rejection and very high regulator gain, which lead to excellent line and load regulation. An impressive 1.5 accuracy is guaranteed over line, load, and temperature. Additional features of the circuit include current limit and thermal shutdown.
VIN
C1 1F IN OUT GND
C2 1F
VOUT
Figure 20. Typical Application Circuit
INPUT Q1 COMPENSATION CAPACITOR PTAT VOS R4
OUTPUT ATTENUATION (VBANDGAP/VOUT) R3 D1 (a) PTAT CURRENT R1 CLOAD RLOAD R2
02191-0-020
NONINVERTING WIDEBAND DRIVER
gm
ADP3339
GND
Figure 21. Functional Block Diagram
Rev. A | Page 9 of 12
02191-0-021
ADP3339
ADP3339 APPLICATION INFORMATION
CAPACITOR SELECTION
Output Capacitor
The stability and transient response of the LDO is a function of the output capacitor. The ADP3339 is stable with a wide range of capacitor values, types, and ESR (anyCAP). A capacitor as low as 1 F is all that is needed for stability. A higher capacitance may be necessary if high output current surges are anticipated, or if the output capacitor cannot be located near the output and ground pins. The ADP3339 is stable with extremely low ESR capacitors (ESR 0) such as multilayer ceramic capacitors (MLCC) or OSCON. Note that the effective capacitance of some capacitor types falls below the minimum over temperature or with dc voltage.
CALCULATING POWER DISSIPATION
Device power dissipation is calculated as follows: PD = (VIN - VOUT) x ILOAD + (VIN x IGND) Where ILOAD and IGND are load current and ground current, and VIN and VOUT are the input and output voltages, respectively. Assuming worst-case operating conditions are ILOAD = 1.5 A, IGND = 14 mA, VIN = 3.3 V, and VOUT = 2.5 V, the device power dissipation is PD = (3.3 V - 2.5 V) x 1500 mA + (3.3 V x 14 mA) = 1246 mW So, for a junction temperature of 125C and a maximum ambient temperature of 85C, the required thermal resistance from junction to ambient is
Input Capacitor
An input bypass capacitor is not strictly required but is recommended in any application involving long input wires or high source impedance. Connecting a 1 F capacitor from the input to ground reduces the circuit's sensitivity to PC board layout and input transients. If a larger output capacitor is necessary, a larger value input capacitor is also recommended.
JA =
125C - 85C 1.246 W
= 32.1C/W
PRINTED CIRCUIT BOARD LAYOUT CONSIDERATIONS
The SOT-223's thermal resistance, JA, is determined by the sum of the junction-to-case and the case-to-ambient thermal resistances. The junction-to-case thermal resistance, JC, is determined by the package design and specified at 26.8C/W. However, the case-to-ambient thermal resistance is determined by the printed circuit board design. As shown in Figure 22, the amount of copper to which the ADP3339 is mounted affects thermal performance. When mounted to the minimal pads of 2 oz. copper (Figure 22a), JA is 126.6C/W. Adding a small copper pad under the ADP3339 (Figure 22b) reduces the JA to 102.9C/W. Increasing the copper pad to 1 square inch (Figure 22c) reduces the JA even further, to 52.8C/W.
OUTPUT CURRENT LIMIT
The ADP3339 is short-circuit protected by limiting the pass transistor's base drive current. The maximum output current is limited to about 3 A. See Figure 16.
THERMAL OVERLOAD PROTECTION
The ADP3339 is protected against damage due to excessive power dissipation by its thermal overload protection circuit. Thermal protection limits the die temperature to a maximum of 160C. Under extreme conditions (i.e., high ambient temperature and power dissipation) where the die temperature starts to rise above 160C, the output current is reduced until the die temperature has dropped to a safe level. Current and thermal limit protections are intended to protect the device against accidental overload conditions. For normal operation, the device's power dissipation should be externally limited so the junction temperature does not exceed 150C.
a
b
c
Figure 22. PCB Layouts
Rev. A | Page 10 of 12
02191-0-022
ADP3339
Use the following general guidelines when designing printed circuit boards: 1. 2. 3. Keep the output capacitor as close to the output and ground pins as possible. Keep the input capacitor as close to the input and ground pins as possible. PC board traces with larger cross sectional areas remove more heat from the ADP3339. For optimum heat transfer, specify thick copper and use wide traces. The thermal resistance can be decreased by adding a copper pad under the ADP3339, as shown in Figure 22b. 6. 5. If possible, utilize the adjacent area to add more copper around the ADP3339. Connecting the copper area to the output of the ADP3339, as shown in Figure 22c, is best, but thermal performance will be improved even if it is connected to other pins. Use additional copper layers or planes to reduce the thermal resistance. Again, connecting the other layers to the output of the ADP3339 is best, but is not necessary. When connecting the output pad to other layers, use multiple vias.
4.
Rev. A | Page 11 of 12
ADP3339 OUTLINE DIMENSIONS
3.15 3.00 2.90
3.50 BSC
1 2 3
7.00 BSC
0.85 0.70 0.60
2.30 BSC
1.05 0.85 1.30 1.10 16 10 0.35 0.26 0.24 10 MAX SEATING PLANE 16 10
1.70 1.50
6.50 BSC
0.10 0.02
4.60 BSC
COMPLIANT TO JEDEC STANDARDS TO-261-AA
Figure 23. 3-Lead Small Outline Transistor Package [SOT-223] (KC-3) Dimensions shown in millimeters
ORDERING GUIDE
Model ADP3339AKC-1.5-RL ADP3339AKC-1.5-RL7 ADP3339AKC-1.8-RL ADP3339AKC-1.8-RL7 ADP3339AKC-2.5-RL ADP3339AKC-2.5-RL7 ADP3339AKC-2.85-RL ADP3339AKC-2.85-RL7 ADP3339AKC-3-RL ADP3339AKC-3-RL7 ADP3339AKC-3.3-RL ADP3339AKC-3.3-RL7 ADP3339AKC-5-RL ADP3339AKC-5-RL7 Temperature Range -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C Output Voltage (V) 1.5 1.5 1.8 1.8 2.5 2.5 2.85 2.85 3.0 3.0 3.3 3.3 5 5 Package Option KC-3 KC-3 KC-3 KC-3 KC-3 KC-3 KC-3 KC-3 KC-3 KC-3 KC-3 KC-3 KC-3 KC-3 Package Description 3-Lead SOT-223 3-Lead SOT-223 3-Lead SOT-223 3-Lead SOT-223 3-Lead SOT-223 3-Lead SOT-223 3-Lead SOT-223 3-Lead SOT-223 3-Lead SOT-223 3-Lead SOT-223 3-Lead SOT-223 3-Lead SOT-223 3-Lead SOT-223 3-Lead SOT-223
(c) 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C02191-0-6/04(A)
Rev. A | Page 12 of 12

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