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ADP3339AKC-33-ADP3339AKC-5
High-Accuracy Ultralow IQ, 1.5 A, anyCAP Low Dropout Regulator
REV.0
FUNCTIONAL BLOCK DIAGRAM
High-Accuracy Ultralow IQ, 1.5 A, anyCAP®
Low Dropout Regulator
FEATURES
High Accuracy Over Line and Load: �0.9% @ 25�C,�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
–40�C to +85�C Ambient Temperature Range
SOT-223 Package
APPLICATIONS
Notebook, Palmtop Computers
SCSI Terminators
Battery-Powered Systems
PCMCIA Regulator
Bar Code Scanners
Camcorders, Cameras
GENERAL DESCRIPTIONThe ADP3339 is a member of the ADP33xx family of precision
low dropout anyCAP voltage regulators. The ADP3339 oper-
ates 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 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
ADP3339 achieves exceptional accuracy of ±0.9% at room
temperature and ±1.5% over temperature, line and load varia-
tions. The dropout voltage of the ADP3339 is only 230 mV
(typical) at 1.5 A. This device also includes a safety current limit
and thermal overload protection. The ADP3339 has ultralow
quiescent current 130 µA (typical) in light load situations.
anyCAP is a registered trademark of Analog Devices Inc.
Figure 1.Typical Application Circuit
ADP3339–SPECIFICATIONS1, 2(VIN = 6.0 V, CIN = COUT = 1 �F, TJ = –40�C to +125�C unless otherwise noted)NOTESAll 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.
Specifications subject to change without notice.
ABSOLUTE MAXIMUM RATINGS*Input Supply Voltage . . . . . . . . . . . . . . . . . . . –0.3 V to +8.5 V
Power Dissipation . . . . . . . . . . . . . . . . . . . . Internally Limited
Operating Ambient Temperature Range . . . . –40°C to +85°C
Operating Junction Temperature Range . . . –40°C to +150°C
θJA Four-Layer Board . . . . . . . . . . . . . . . . . . . . . . . . 62.3°C/W
θJC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26.8°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. Unless otherwise specified, all voltages are referenced
to GND.
PIN FUNCTION DESCRIPTIONS
PIN CONFIGURATION
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the ADP3339 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.
ORDERING GUIDE*Contact the factory for other voltage options.
ADP3339
–Typical Performance Characteristics(TA = 25�C unless otherwise noted.)TPC 1.Output Voltage vs. Supply
Voltage
TPC 4.Ground Current vs.
Load Current
TPC 7.Dropout Voltage vs. Load
Current
LOAD CURRENT – A
OUTPUT VOLTAGE
3.2940.51.01.5TPC 2.Output Voltage vs. Load
Current
TPC 5.Output Voltage Variation
% vs. Junction Temperature
TPC 8.Power-Up/Power-Down
TPC 3.Ground Current
vs. Supply Voltage
JUNCTION TEMPERATURE – �C
GROUND CURRENT
mA
160TPC 6.Ground Current vs.
Junction Temperature
TPC 9.Line Transient Response
TPC 10.Line Transient Response
TPC 13.Short-Circuit Current
FREQUENCY – Hz
0.0011001k10k100k1M
VOLTAGE NOISE SPECTRAL DENSITYTPC 16.Output Noise Density
TPC 11.Load Transient Response
START 10.000Hz
–1001001k10k100k1M
STOP 100,000.000Hz
RIPPLE REJECTION
dB
FREQUENCY – HzTPC 14.Power Supply Ripple
Rejection
TPC 12.Load Transient Response
CL – �F
RMS NOISE
10010203040TPC 15.RMS Noise vs. CL
(10 Hz–100 kHz)
ADP3339
THEORY OF OPERATIONThe new anyCAP LDO ADP3339 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.
Figure 2.Functional Block Diagram
A very high-gain error amplifier is used to control this loop. The
amplifier is constructed in such a way that equilibrium pro-
duces a large, temperature-proportional input, “offset voltage”
that is repeatable and very well controlled. The temperature-
proportional offset voltage is combined with the complementary
diode voltage to form a “virtual bandgap” voltage, 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 flexibil-
ity 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 bandgap
voltage to the output voltage. Although the R1, R2 resistor divider
is loaded by the diode D1 and a second divider consisting of R3
and R4, the values can be chosen to produce a temperature-stable
output. This unique arrangement specifically corrects for the load-
ing 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. More-
over, the ESR value, required to keep conventional LDOs stable,
changes depending on load and temperature. These ESR limita-
tions 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 µF capacitor on the out-
put. Additional advantages of the pole-splitting scheme include
superior line noise rejection and very high regulator gain, which
leads 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 ther-
mal shutdown.
Figure 3.Typical Application Circuit
APPLICATION INFORMATION
CAPACITOR SELECTION
Output CapacitorThe 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 µF 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 fall below the minimum over temperature
or with dc voltage.
Input CapacitorAn input bypass capacitor is not strictly required but it is recom-
mended in any application involving long input wires or high
source impedance. Connecting a 1 µF capacitor from the
input to ground reduces the circuit’s sensitivity to PC board
layout and input transients. If a larger output capacitor is neces-
sary, then a larger value input capacitor is also recommended.
OUTPUT CURRENT LIMITThe 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 TPC 13.
THERMAL OVERLOAD PROTECTIONThe 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 160°C.
Under extreme conditions (i.e., high ambient temperature and
power dissipation) where the die temperature starts to rise above
160°C, the output current will be reduced until the die tempera-
ture 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 that the junction temperature will not exceed 125°C.
