ADP3309ART-2.7-ADP3309ART-2.85-ADP3309ART-3.3 Fast Delivery |IC PHOENIX CO.,LIMITED

ADP3309ART-2.7 ,anyCAP⑩ 100 mA Low Dropout Linear RegulatorGENERAL DESCRIPTION120 mV (typical) at 100 mA. This device also includes a currentThe ADP3309 is a ..
ADP3309ART-2.7-RL ,anyCAP® 100 mA Low Dropout Linear RegulatorAPPLICATIONSCellular TelephonesNotebook, Palmtop ComputersBattery Powered SystemsPCMCIA RegulatorBa ..
ADP3309ART-2.7-RL7 ,anyCAP® 100 mA Low Dropout Linear Regulatorspecifications apply to all voltage options.ADP3308-xx–
ADP3309ART-2.85 ,anyCAP⑩ 100 mA Low Dropout Linear RegulatorSpecifications subject to change without notice.–2– REV. 0ADP3309ABSOLUTE MAXIMUM RATINGS* PIN FUNC ..
ADP3309ART-2.85R7 ,anyCAP® 100 mA Low Dropout Linear RegulatorSPECIFICATIONSParameter Symbol Conditions Min Typ Max UnitOUTPUT VOLTAGE ACCURACY V V = V + 0.3 V t ..
ADP3309ART-2.85-R7 ,anyCAP® 100 mA Low Dropout Linear Regulatorapplications.Figure 1. Typical Application CircuitThe ADP3308 achieves ±1.2% accuracy at room tempe ..
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ADP3309ART-2.7-ADP3309ART-2.85-ADP3309ART-3.3
anyCAP⑩ 100 mA Low Dropout Linear Regulator
REV.0
anyCAP™ 100 mA
Low Dropout Linear Regulator
FUNCTIONAL BLOCK DIAGRAM
OUT
GND
ERR/NC
FEATURES
61.2% Accuracy Over Line and Load Regulations @ +258C
Ultralow Dropout Voltage: 120 mV Typical @ 100 mA
Requires Only CO = 0.47 mF for Stability
anyCAP = Stable with All Types of Capacitors
(Including MLCC)
Current and Thermal Limiting
Low Noise
Low Shutdown Current: 1 mA
3.0 V to 12 V Supply Range
–208C to +858C 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
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 con-
ventional LDOs with a novel architecture and an enhanced
process. Its patented design requires only a 0.47 mF output
capacitor for stability. This device is stable with any type of
capacitor regardless of its ESR (Equivalent Series Resistance)
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 mA.
The ADP3309 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 ADP3309 anyCAP LDO offers a wide range of output
voltages. For a 50 mA version, refer to the ADP3308 data sheet.
VOUT = +3.3VVIN
ERR/NC
OFFGND
0.47mF
0.47mF
Figure 1.Typical Application Circuit
anyCAP is a trademark of Analog Devices, Inc.
ADP3309-xx–SPECIFICATIONS
LOAD REGULATION
GROUND CURRENT
NOTESAmbient temperature of +85°C corresponds to a junction temperature of 125°C under typical full load test conditions.
Specifications subject to change without notice.
(@TA = –208C to +858C, VIN = 7 V, CIN = 0.47 mF, COUT = 0.47 mF, unless
otherwise noted.)1 The following specifications apply to all voltage options.
ABSOLUTE MAXIMUM RATINGS*
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°CJA␣ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .190°C/WJC␣ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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.
ORDERING GUIDE
*SOT = Surface Mount.
Contact the factory for the availability of other output voltage options.
Other Member of anyCAP Family1
NOTES
1See individual data sheet for detailed ordering information.
2SOT = Surface Mount.
PIN FUNCTION DESCRIPTIONS
PIN CONFIGURATION
CAUTION
ESD (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 ADP3309 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.
ADP3309
–Typical Performance Characteristics
Figure 2.Line Regulation: Output
Voltage vs. Supply Voltage
OUTPUT LOAD – mA
GROUND CURRENT –
300
Figure 5.Quiescent Current vs. Load
Current
Figure 8.Dropout Voltage vs. Output
Current
Figure 3.Output Voltage vs. Load
Current
TEMPERATURE – 8C
OUTPUT VOLTAGE – %
Figure 6.Output Voltage Variation %
vs. Temperature0234321
INPUT/OUTPUT VOLTAGE – Volts
INPUT VOLTAGE – Volts
Figure 9.Power-Up/Power-Down
INPUT VOLTAGE – Volts
GROUND CURRENT –
160
Figure 4.Quiescent Current vs.
Supply Voltage
TEMPERATURE – 8C
GROUND CURRENT –
250
Figure 7.Quiescent Current vs.
Temperature
TIME – ms
INPUT/OUTPUT VOLTAGE – Volts
2.0
Figure 10.Power-Up Overshoot
Volts
TIME – ms
Figure 11.Line Transient Response
Volts
TIME – ms
Figure 14.Load Transient
Volts
TIME – ms
Figure 17.Turn Off
TIME – ms
Volts
7.5
Figure 12.Line Transient Response
Volts
TIME – sec
0.54.51.52.53.5
Figure 15.Short Circuit Current
FREQUENCY – Hz
RIPPLE REJECTION – dB10010M1k10k1M
100k
–90
Figure 18.Power Supply Ripple
Rejection
Volts
TIME – ms
Figure 13.Load Transient
Volts20100406080
TIME – ms
Figure 16.Turn On
1001k100k10k
FREQUENCY – Hz
VOLTAGE NOISE SPECTRAL DENSITY –
V Hz
Figure 19.Output Noise Density
ADP3309
THEORY OF OPERATION
The ADP3309 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.
GND
Figure 20.␣Functional Block Diagram
A very high gain error amplifier is used to control this loop. The
amplifier is constructed in such a way that at equilibrium it
produces a large, temperature proportional input “offset volt-
age” that is repeatable and very well controlled. The tem-
perature proportional offset voltage is combined with the
complementary diode voltage to form a “virtual bandgap” volt-
age, 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 bandgap
voltage to the output voltage. Although the R1, R2 resistor
divider is loaded by the diode D1, and a second divider consist-
ing of R3 and R4, the values can be chosen to produce a tem-
perature stable output.
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 resis-
tance. Moreover, the ESR value, required to keep conventional
LDOs stable, changes depending on load and temperature.
These ESR limitations make designing with LDOs more diffi-
cult because of their unclear specifications and extreme varia-
tions over temperature.
This is no longer true with the ADP3309 anyCAP LDO. It can
be used with virtually any capacitor, with no constraint on the
minimum ESR. This innovative design allows the circuit to be
stable with just a small 0.47 mF capacitor on the output. Addi-
tional advantages of the design scheme include superior line
noise rejection and very high regulator gain which leads to ex-
Additional features of the circuit include current limit and ther-
mal shutdown. Compared to the standard solutions that give
warning after the output has lost regulation, the ADP3309
provides improved system performance by enabling the ERR
pin to give warning before the device loses regulation.
As the chip’s temperature rises above 165°C, the circuit acti-
vates a soft thermal shutdown, indicated by a signal low on the
ERR pin, to reduce the current to a safe level.
APPLICATION INFORMATION
Capacitor Selection: anyCAP
Output Capacitors: As with any micropower device, output
transient response is a function of the output capacitance. The
ADP3309 is stable with a wide range of capacitor values, types
and ESR (anyCAP). A capacitor as low as 0.47 mF is all that is
needed for stability. However, larger capacitors can be used if
high output current surges are anticipated. The ADP3309 is
stable with extremely low ESR capacitors (ESR » 0), such as
multilayer ceramic capacitors (MLCC) or OSCON.
Input Bypass Capacitor: An input bypass capacitor is not re-
quired. However, for applications where the input source is high
impedance or far from the input pin, a bypass capacitor is rec-
ommended. Connecting a 0.47 mF capacitor from the input pin
(Pin 1) to ground reduces the circuit’s sensitivity to PC board
layout. If a bigger output capacitor is used, the input capacitor
must be 1 mF minimum.
Thermal Overload Protection
The ADP3309 is protected against damage due to excessive
power dissipation by its thermal overload protection circuit,
which limits the die temperature to a maximum of 165°C.
Under extreme conditions (i.e., high ambient temperature and
power dissipation) where die temperature starts to rise above
165°C, the output current is reduced until the die temperature
has dropped to a safe level. The output current is restored when
the die temperature is reduced.
Current and thermal limit protections are intended to protect
the device against accidental overload conditions. For normal
operation, device power dissipation should be externally limited
so that junction temperatures will not exceed 125°C.
Calculating Junction Temperature
Device power dissipation is calculated as follows:
PD = (VIN – VOUT) ILOAD + (VIN) IGND
Where ILOAD and IGND are load current and ground current, VIN
and VOUT are input and output voltages respectively.
Assuming ILOAD = 100 mA, IGND = 2 mA, VIN = 5.0 V and
VOUT = 3.3 V, device power dissipation is:
PD = (5.0 – 3.3) 100 mA + 5.0 · 2 mA = 180 mWT = TJ – TA = PD · qJA = 0.18 · 190 = 34.2°C
With a maximum junction temperature of 125°C, this yields a
maximum ambient temperature of ~90°C.
Printed Circuit Board Layout Consideration
Surface mount components rely on the conductive traces or
pads to transfer heat away from the device. Appropriate PC
board layout techniques should be used to remove heat from the

Partno	Mfg	Dc	Qty	Available	Descript
ADP3309ART-2.7 \|ADP3309ART27	AD	N/a	9500	avai	anyCAP⑩ 100 mA Low Dropout Linear Regulator
ADP3309ART-2.85 \|ADP3309ART285	AD	N/a	2952	avai	anyCAP⑩ 100 mA Low Dropout Linear Regulator
ADP3309ART-3.3 \|ADP3309ART33	AD	N/a	3000	avai	anyCAP⑩ 100 mA Low Dropout Linear Regulator