AAT3238
300mA MicroPowerTM High Performance LDO Linear RegulatorPowerLinearTM
PRODUCT DATASHEET
3238.2011.08.1.8 1
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General Description
The AAT3238 MicroPower low dropout (LDO) linear regu-
lator is ideally suited for portable applications where
very fast transient response, extended battery life, and
small size are critical. The AAT3238 has been specifically
designed for high-speed turn-on and turn-off perfor-
mance, fast transient response, good power supply rip-
ple rejection (PSRR), and is reasonably low noise, mak-
ing it ideal for powering sensitive circuits with fast
switching requirements.
Other features include low quiescent current, typically
70µA, and low dropout voltage, typically less than
400mV at the maximum output current level of 300mA.
The device is output short-circuit protected and has a
thermal shutdown circuit for additional protection under
extreme operating conditions.
The AAT3238 also features a low-power shutdown mode
for extended battery life. A reference bypass pin has
been provided to improve PSRR performance and output
noise by connecting a small external capacitor from the
AAT3238’s reference output to ground.
The AAT3238 is available in a Pb-free, space-saving
6-pin SOT23 or 8-pin SC70JW package in factory-pro-
grammed voltages.
Features
• LowDropout:400mVat300mA
• Guaranteed300mAOutput
• HighAccuracy:±1.5%
• 70µAQuiescentCurrent
• FastLineandLoadTransientResponse
• High-SpeedDeviceTurn-OnandShutdown
• HighPowerSupplyRippleRejection
• LowSelfNoise
• Short-CircuitProtection
• Over-TemperatureProtection
• UsesLowEquivalentSeriesResistance(ESR)Ceramic
Capacitors
• NoiseReductionBypassCapacitor
• ShutdownModeforLongerBatteryLife
• LowTemperatureCoefficient
• Factory-ProgrammedOutputVoltages
• SOT236-PinorSC70JW8-PinPackage
Applications
• CellularPhones
• DigitalCameras
• NotebookComputers
• PersonalPortableElectronics
• PortableCommunicationDevices
Typical Application
AAT3238
EN
IN OUT
BYP
GND
ON/OFF
1µF 10nF 2.2µF
VIN
GND GND
VOUT
AAT3238
300mA MicroPowerTM High Performance LDO Linear RegulatorPowerLinearTM
PRODUCT DATASHEET
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AAT3238
300mA MicroPowerTM High Performance LDO Linear RegulatorPowerLinearTM
PRODUCT DATASHEET
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Pin Descriptions
Pin #
Symbol FunctionSOT23-6 SC70JW-8
15,6 IN Inputvoltagepin;shouldbedecoupledwith1µForgreatercapacitor.
2,5 8GND Groundconnectionpin.
3 7 EN Enablepin;thispinshouldnotbeleftoating.Whenpulledlow,thePMOSpasstransistor
turns off and all internal circuitry enters low-power mode, consuming less than 1µA.
4 1 BYP Bypasscapacitorconnection;toimproveACripplerejection,connecta10nFcapacitorto
GND.Thiswillalsoprovideasoft-startfunction.
6 2, 3, 4 OUT Outputpin;shouldbedecoupledwith2.2µFceramiccapacitor.
Pin Configuration
SOT23-6 SC70JW-8
(Top View) (Top View)
GND
OUT
GND
BYP
EN
IN
1
2
34
5
6
OUT
OUT
OUT
GND
EN
IN
IN
BYP 1
2
3
45
6
7
8
AAT3238
300mA MicroPowerTM High Performance LDO Linear RegulatorPowerLinearTM
PRODUCT DATASHEET
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AAT3238
300mA MicroPower
TM
High Performance LDO Linear RegulatorPowerLinear
TM
PRODUCT DATASHEET
3238.2011.08.1.8 3
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Absolute Maximum Ratings1
TA=25°C,unlessotherwisenoted.
Symbol Description Value Units
VIN Input Voltage 6 V
VENIN(MAX) MaximumENtoInputVoltage 0.3
IOUT DC Output Current PD/(VIN - VO) mA
TJOperating Junction Temperature Range -40to150 °C
Recommended Operating Conditions
Symbol Description Rating Units
VIN Input Voltage (VOUT + VDO)to5.5 V
T Ambient Temperature Range2-40to+85 °C
Thermal Information3
Symbol Description Rating Units
QJA Maximum Thermal Resistance 150 °C/W
PDMaximum Power Dissipation 667 mW
1. StressesabovethoselistedinAbsoluteMaximumRatingsmaycausepermanentdamagetothedevice.Functionaloperationatconditionsotherthantheoperatingconditions
specified is not implied.
2. Mounted on a demo board.
3. Tocalculateminimuminputvoltage,usethefollowingequation:VIN(MIN) = VOUT(MAX) + VDO(MAX) as long as VIN ≥2.5V.
AAT3238
300mA MicroPowerTM High Performance LDO Linear RegulatorPowerLinearTM
PRODUCT DATASHEET
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300mA MicroPowerTM High Performance LDO Linear RegulatorPowerLinearTM
PRODUCT DATASHEET
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Electrical Characteristics1
VIN = VOUT(NOM) + 1V for VOUToptionsgreaterthan1.5V.VIN=2.5VforVOUT ≤1.5V.IOUT = 1mA, COUT=2.2µF,CIN=1µF,
TA=-40°Cto+85°C,unlessotherwisenoted.TypicalvaluesareTA=25°C.
Symbol Description Conditions Min Typ Max Units
VOUT Output Voltage Tolerance IOUT = 1mA to 300mA TA=25°C -1.5 1.5 %
TA=-40to85°C -2.5 2.5
IOUT Output Current VOUT > 1.2V 300 mA
VDO Dropout Voltage2, 3 IOUT = 300mA 400 600 mV
ISC Short-Circuit Current VOUT < 0.4V 600 mA
IQGroundCurrent VIN=5V,NoLoad,EN=VIN 70 125 µA
ISD Shutdown Current VIN=5V,EN=0V 1 µA
DVOUT/
VOUT*DVIN
Line Regulation VIN = VOUT+1to5.0V 0.09 %/V
DVOUT(line) Dynamic Line Regulation VIN = VOUT + 1V to VOUT + 2V, IOUT = 300mA,
TR/TF = 2µs 2.5 mV
DVOUT(load) Dynamic Load Regulation IOUT = 1mA to 300mA, TR<5µs 60
tENDLY EnableDelayTime BYP=Open 15 µs
VEN(L) EnableThresholdLow 0.6 V
VEN(H) EnableThresholdHigh 1.5
IEN LeakageCurrentonEnablePin VEN=5V 1 µA
PSRR Power Supply Rejection Ratio IOUT = 10mA, CBYP = 10nF
1kHz 67
dB10kHz 47
1MHz 45
TSD Over-Temperature Shutdown Threshold 145 °C
THYS Over-TemperatureShutdownHysteresis 12
eNOutputNoise 50 µVrms
TC OutputVoltageTemperatureCoefcient 22 ppm/°C
1. TheAAT3238isguaranteedtomeetperformancespecificationsoverthe-40°Cto+85°Coperatingtemperaturerangeandisassuredbydesign,characterization,andcorrela-
tion with statistical process controls.
2. VDO is defined as VIN - VOUT when VOUTis98%ofnominal.
3. ForVOUT < 2.1V, VDO=2.5V-VOUT
.
AAT3238
300mA MicroPowerTM High Performance LDO Linear RegulatorPowerLinearTM
PRODUCT DATASHEET
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AAT3238
300mA MicroPower
TM
High Performance LDO Linear RegulatorPowerLinear
TM
PRODUCT DATASHEET
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Typical Characteristics
Unlessotherwisenoted,VIN=5V,TA=25°C.
Output Voltage vs. Temperature
1.196
1.197
1.198
1.199
1.200
1.201
1.202
1.203
-40-30 -20-10 0102030405060708090 100
Temperature (°C)
Output Voltage (V)
Dropout Voltage vs. Output Current
0
50
100
150
200
250
300
350
400
450
500
050 100 150 200 250 300
Output Current (mA)
Dropout Voltage (mV)
85°C
25°C
-40°C
Ground Current vs. Input Voltage
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
22.5 33.5 4.5
45
Input Voltage (V)
Ground Current (µA)
IOUT = 0mA
IOUT = 10mA
IOUT = 50mA
IOUT = 150mA
IOUT = 300mA
Quiescent Current vs. Temperature
0
10
20
30
40
50
60
70
80
90
100
-40-30 -20-10 0102030405060708090 100 110 120
Temperature (°C)
Quiescent Current (µA)
LDO Initial Power-Up Response Time
Time (50µs/div)
Output Voltage (bottom) (V)
Input Voltage (top) (V)
-1
0
1
2
3
4
5
6
7
-2
-1
0
1
2
3
4
5
6
Turn-Off Response Time
(CBYP = 10nF)
Time (50µs/div)
VEN (5V/div)
VOUT (1V/div)
AAT3238
300mA MicroPowerTM High Performance LDO Linear RegulatorPowerLinearTM
PRODUCT DATASHEET
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AAT3238
300mA MicroPowerTM High Performance LDO Linear RegulatorPowerLinearTM
PRODUCT DATASHEET
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Typical Characteristics
Unlessotherwisenoted,VIN=5V,TA=25°C.
Turn-On Time From Enable (VIN present)
(CBYP = 10nF)
Time (5µs/div)
VIN = 4V
VOUT = 1V/div
VEN = 5V/div
Line Transient Response
2.98
2.99
3.00
3.01
3.02
3.03
3.04
Time (100µs/div)
Input Voltage (V)
0
1
2
3
4
5
6
Output Voltage (V)
VIN
VOUT
AAT3238 Self Noise
(COUT = 10µF, Ceramic)
0.001
0.01
0.1
1
10
0.01 0.1110 100 1000 10000
Frequency (kHz)
Noise Amplitude (µV/rtHz)
Band Power:
300Hz to 50kHz = 44.6µVrms/rtHz
100Hz to 100kHz = 56.3µVrms/rtHz
Load Transient Response 300mA
2.10
2.20
2.30
2.40
2.50
2.60
2.70
2.80
2.90
3.00
Time (10µs/div)
-100
0
100
200
300
400
500
600
700
800
VOUT
IOUT
Output Voltage (V)
Output Current (mA)
Over-Current Protection
-200
0
200
400
600
800
1000
1200
Time (20ms/div)
Output Current (mA)
VIH and VIL vs. VIN
1.050
1.075
1.100
1.125
1.150
1.175
1.200
1.225
1.250
2.53.0 3.54.0 4.55.0 5.5
VIN (V)
VIH
VIL
AAT3238
300mA MicroPowerTM High Performance LDO Linear RegulatorPowerLinearTM
PRODUCT DATASHEET
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AAT3238
300mA MicroPower
TM
High Performance LDO Linear RegulatorPowerLinear
TM
PRODUCT DATASHEET
3238.2011.08.1.8 7
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Functional Description
The AAT3238 is intended for LDO regulator applications
where output current load requirements range from no
load to 300mA.
The advanced circuit design of the AAT3238 has been
specifically optimized for very fast start-up and shut-
down timing. This proprietary CMOS LDO has also been
tailored for superior transient response characteristics.
These traits are particularly important for applications
thatrequirefastpowersupplytiming,suchasGSMcel-
lular telephone handsets.
The high-speed turn-on capability of the AAT3238 is
enabled through the implementation of a fast start con-
trol circuit, which accelerates the power-up behavior of
fundamental control and feedback circuits within the
LDO regulator.
Fastturn-offresponsetimeisachievedbyanactiveoutput
pull-down circuit, which is enabled when the LDO regulator
is placed in the shutdown mode. This active fast shutdown
circuit has no adverse effect on normal device operation.
The AAT3238 has very fast transient response character-
istics, which is an important feature for applications
where fast line and load transient response is required.
This rapid transient response behavior is accomplished
through the implementation of an active error amplifier
feedback control. This proprietary circuit design is
unique to this MicroPower LDO regulator.
The LDO regulator output has been specifically optimized
to function with low-cost, low-ESR ceramic capacitors.
However,thedesignwillallowforoperationoverawide
range of capacitor types.
A bypass pin has been provided to allow the addition of
an optional voltage reference bypass capacitor to reduce
output self noise and increase power supply ripple rejec-
tion. Device self noise and PSRR will be improved by the
additionofasmallceramiccapacitorinthispin.However,
increased values of CBYPASS may slow down the LDO regu-
lator turn-on time.
This LDO regulator has complete short-circuit and ther-
mal protection. The integral combination of these two
internal protection circuits gives the AAT3238 a compre-
hensive safety system to guard against extreme adverse
operating conditions. Device power dissipation is limited
to the package type and thermal dissipation properties.
Refer to the Thermal Considerations section of this data-
sheet for details on device operation at maximum output
current loads.
Functional Block Diagram
Error
Amplifier
Over-Current
Protection
Over-
Temperature
Protection
Voltage
Reference
+
-
IN
EN
BYP
OUT
GND
Active
Feedback
Control
Fast
Start
Control
AAT3238
300mA MicroPowerTM High Performance LDO Linear RegulatorPowerLinearTM
PRODUCT DATASHEET
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Applications Information
To assure the maximum possible performance is obtained
from the AAT3238, please refer to the following applica-
tion recommendations.
Input Capacitor
Typically,a 1µFor largercapacitorisrecommendedfor
CIN in most applications. A CIN capacitor is not required
for basic LDO regulator operation. However, if the
AAT3238 is physically located more than three centime-
ters from an input power source, a CIN capacitor will be
needed for stable operation. CIN should be located as
closely to the device VIN pin as practically possible. CIN
values greater than 1µF will offer superior input line
transient response and will assist in maximizing the
highest possible power supply ripple rejection.
Ceramic, tantalum, or aluminum electrolytic capacitors
may be selected for CIN.ThereisnospecificcapacitorESR
requirement for CIN. However, for 300mA LDO regulator
output operation, ceramic capacitors are recommended
for CIN due to their inherent capability over tantalum
capacitors to withstand input current surges from low
impedance sources such as batteries in portable devices.
Output Capacitor
Forproperloadvoltageregulationandoperationalstabil-
ity, a capacitor is required between pins VOUTandGND.
The COUT capacitor connection to the LDO regulator
ground pin should be made as direct as practically pos-
sible for maximum device performance.
The AAT3238 has been specifically designed to function
with very low ESR ceramic capacitors. For best perfor-
mance, ceramic capacitors are recommended.
Typical output capacitor values for maximum output cur-
rent conditions range from 1µF to 10µF. Applications
utilizing the exceptionally low output noise and optimum
power supply ripple rejection characteristics of the
AAT3238shoulduse2.2µForgreaterforCOUT
. If desired,
COUT may be increased without limit.
In low output current applications where output load is
less than 10mA, the minimum value for COUT can be as
lowas0.47µF.
Bypass Capacitor and
Low Noise Applications
A bypass capacitor pin is provided to enhance the low
noise characteristics of the AAT3238 LDO regulator. The
bypass capacitor is not necessary for operation of the
AAT3238.However,forbestdeviceperformance,asmall
ceramic capacitor should be placed between the bypass
pin(BYP)andthedevicegroundpin(GND).Thevalueof
CBYPmayrangefrom470pFto10nF.Forlowestnoiseand
best possible power supply ripple rejection performance,
a 10nF capacitor should be used. To practically realize
the highest power supply ripple rejection and lowest
output noise performance, it is critical that the capacitor
connectionbetweentheBYPpinandGND pinbedirect
andPCBtracesshouldbeasshortaspossible.Referto
thePCBLayoutRecommendationssectionofthisdocu-
ment for examples.
There is a relationship between the bypass capacitor
value and the LDO regulator turn-on and turn-off time.
In applications where fast device turn-on and turn-off
time are desired, the value of CBYP should be reduced.
In applications where low noise performance and/or
ripple rejection are less of a concern, the bypass capac-
itor may be omitted. The fastest device turn-on time will
be realized when no bypass capacitor is used.
DC leakage on this pin can affect the LDO regulator output
noiseandvoltageregulationperformance.Forthisreason,
theuseofalowleakage,highqualityceramic(NPOorC0G
type) or film capacitor is highly recommended.
Capacitor Characteristics
Ceramic composition capacitors are highly recommended
over all other types of capacitors for use with the
AAT3238. Ceramic capacitors offer many advantages
over their tantalum and aluminum electrolytic counter-
parts.AceramiccapacitortypicallyhasverylowESR,is
lower cost, has a smaller PCB footprint, and is non-
polarized. Line and load transient response of the LDO
regulatorisimprovedbyusinglow-ESRceramiccapaci-
tors. Since ceramic capacitors are non-polarized, they
are not prone to incorrect connection damage.
Equivalent Series Resistance
ESRisaveryimportantcharacteristictoconsiderwhen
selectingacapacitor.ESRistheinternalseriesresistance
associated with a capacitor that includes lead resistance,
internal connections, size and area, material composi-
tion,andambienttemperature.Typically,capacitorESR
AAT3238
300mA MicroPowerTM High Performance LDO Linear RegulatorPowerLinearTM
PRODUCT DATASHEET
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is measured in milliohms for ceramic capacitors and can
range to more than several ohms for tantalum or alumi-
num electrolytic capacitors.
Ceramic Capacitor Materials
Ceramic capacitors less than 0.1µF are typically made
from NPO or C0G materials. NPO and C0G materials
generally have tight tolerance and are very stable over
temperature. Larger capacitor values are usually com-
posed of X7R, X5R, Z5U, or Y5V dielectric materials.
These two material types are not recommended for use
with LDO regulators since the capacitor tolerance can
vary more than ±50% over the operating temperature
range of the device. A 2.2µF Y5V capacitor could be
reducedto1µFovertemperature;thiscouldcauseprob-
lems for circuit operation. X7R and X5R dielectrics are
muchmoredesirable.ThetemperaturetoleranceofX7R
dielectricisbetterthan±15%.
CapacitorareaisanothercontributortoESR.Capacitors
that are physically large in size will have a lower ESR
when compared to a smaller sized capacitor of an equiv-
alent material and capacitance value. These larger devic-
es can improve circuit transient response when com-
pared to an equal value capacitor in a smaller package
size.
Consult capacitor vendor datasheets carefully when
selecting capacitors for LDO regulators.
Enable Function
The AAT3238 features an LDO regulator enable/
disablefunction.Thispin(EN)isactivehighandiscom-
patible with CMOS logic. To assure the LDO regulator will
switchon,theENturn-oncontrollevelmustbegreater
than 1.5V. The LDO regulator will go into the disable
shutdown mode when the voltage on the EN pin falls
below 0.6V. If the enable function is not needed in a
specific application, it may be tied to VIN to keep the LDO
regulator in a continuously on state.
When the LDO regulator is in shutdown mode, an inter-
nal1.5kW resistor is connected between VOUTandGND.
This is intended to discharge COUT when the LDO regula-
torisdisabled.Theinternal1.5kW has no adverse effect
on device turn-on time.
Short-Circuit Protection
The AAT3238 contains an internal short-circuit protec-
tion circuit that will trigger when the output load current
exceedstheinternalthresholdlimit.Undershort-circuit
conditions, the output of the LDO regulator will be cur-
rent limited until the short-circuit condition is removed
from the output or the LDO regulator package power
dissipation exceeds the device thermal limit.
Thermal Protection
The AAT3238 has an internal thermal protection circuit
which will turn on when the device die temperature
exceeds 145°C. The internal thermal protection circuit
will actively turn off the LDO regulator output pass
device to prevent the possibility of over-temperature
damage. The LDO regulator output will remain in a shut-
down state until the internal die temperature falls back
belowthe145°Ctrippoint.
The combination and interaction between the short-cir-
cuit and thermal protection systems allow the LDO regu-
lator to withstand indefinite short-circuit conditions
without sustaining permanent damage.
No-Load Stability
The AAT3238 is designed to maintain output voltage
regulation and stability under operational no-load condi-
tions. This is an important characteristic for applications
where the output current may drop to zero.
Reverse Output-to-Input
Voltage Conditions and Protection
Under normal operating conditions, a parasitic diode
exists between the output and input of the LDO regula-
tor. The input voltage should always remain greater than
the output load voltage, maintaining a reverse bias on
the internal parasitic diode. Conditions where VOUT might
exceed VIN should be avoided since this would forward
bias the internal parasitic diode and allow excessive cur-
rent flow into the VOUT pin, possibly damaging the LDO
regulator.
In applications where there is a possibility of VOUT
exceeding VIN for brief amounts of time during normal
operation, the use of a larger value CIN capacitor is
highly recommended. A larger value of CIN with respect
to COUT will effect a slower CIN decay rate during shut-
down, thus preventing VOUT from exceeding VIN. In appli-
cations where there is a greater danger of VOUT exceed-
ing VIN for extended periods of time, it is recommended
to place a Schottky diode across VIN to VOUT (connecting
the cathode to VIN and anode to VOUT). The Schottky
AAT3238
300mA MicroPowerTM High Performance LDO Linear RegulatorPowerLinearTM
PRODUCT DATASHEET
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diodeforwardvoltageshouldbelessthan0.45V.
Ordering Information
Output Voltage Package Marking1Part Number (Tape and Reel)2
1.2V SOT23-6 KIXYY AAT3238IGU-1.2-T1
1.8V SOT23-6 JRXYY AAT3238IGU-1.8-T1
2.0V SOT23-6 AAT3238IGU-2.0-T1
2.3V SOT23-6 AAT3238IGU-2.3-T1
2.7V SOT23-6 AAT3238IGU-2.7-T1
3.0V SOT23-6 AAT3238IGU-3.0-T1
3.3V SOT23-6 AAT3238IGU-3.3-T1
3.5V SOT23-6 AAT3238IGU-3.5-T1
1.2V SC70JW-8 KIXYY AAT3238IJS-1.2-T1
2.0V SC70JW-8 AAT3238IJS-2.0-T1
2.3V SC70JW-8 AAT3238IJS-2.3-T1
2.5V SC70JW-8 AAT3238IJS-2.5-T1
2.7V SC70JW-8 AAT3238IJS-2.7-T1
2.85 SC70JW-8 AAT3238IJS-2.85-T1
3.3V SC70JW-8 AAT3238IJS-3.3-T1
3.5V SC70JW-8 AAT3238IJS-3.5-T1
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semiconductor
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2. Sample stock is generally held on part numbers listed in BOLD.
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300mA MicroPower
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Package Information
SOT23-6
1.90 BSC
0.95 BSC
0.45 ± 0.15 0.10 BSC
2.85 ± 0.15
0.075 ± 0.075
0.40 ± 0.10 × 6
1.575
±
0.125
1.20
±
0.25
1.10
±
0.20 2.80
±
0.20
4°
±
4°
10°
±
5°
0.15
±
0.07
GAUGE PLANE
0.60 REF
SC70JW-8
0.225 ± 0.075
0.45 ± 0.10
0.05 ± 0.05
2.10 ± 0.30
2.00 ± 0.20
7° ± 3°4° ± 4°
1.75 ± 0.10
0.85 ± 0.15
0.15 ± 0.05
1.10 MAX
0.100
2.20 ± 0.20
0.048REF
0.50 BSC 0.50 BSC 0.50 BSC
All dimensions in millimeters.
AAT3238
300mA MicroPowerTM High Performance LDO Linear RegulatorPowerLinearTM
PRODUCT DATASHEET
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300mA MicroPowerTM High Performance LDO Linear RegulatorPowerLinearTM
PRODUCT DATASHEET
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