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PRODUCT DATASHEET
AAT3238
PowerLinear
TM
300mA MicroPowerTM High Performance LDO Linear Regulator
Features
* * * * * * * * * * * * * * * * Low Dropout: 400mV at 300mA Guaranteed 300mA Output High Accuracy: 1.5% 70A Quiescent Current Fast Line and Load Transient Response High-Speed Device Turn-On and Shutdown High Power Supply Ripple Rejection Low Self Noise Short-Circuit Protection Over-Temperature Protection Uses Low Equivalent Series Resistance (ESR) Ceramic Capacitors Noise Reduction Bypass Capacitor Shutdown Mode for Longer Battery Life Low Temperature Coefficient Factory-Programmed Output Voltages SOT23 6-Pin or SC70JW 8-Pin Package
General Description
The AAT3238 MicroPower low dropout (LDO) linear regulator 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 performance, fast transient response, good power supply ripple rejection (PSRR), and is reasonably low noise, making it ideal for powering sensitive circuits with fast switching requirements. Other features include low quiescent current, typically 70A, 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-programmed voltages.
Applications
* * * * * Cellular Phones Digital Cameras Notebook Computers Personal Portable Electronics Portable Communication Devices
Typical Application
VIN IN OUT VOUT
AAT3238
ON/OFF EN GND 1F 10nF 2.2F BYP
GND
GND
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PRODUCT DATASHEET
AAT3238
PowerLinear
TM
300mA MicroPowerTM High Performance LDO Linear Regulator
Pin Descriptions
Pin #
SOT23-6 1 2, 5 3 4 6 SC70JW-8 5, 6 8 7 1 2, 3, 4
Symbol
IN GND EN BYP OUT
Function
Input voltage pin; should be decoupled with 1F or greater capacitor. Ground connection pin. Enable pin; this pin should not be left floating. When pulled low, the PMOS pass transistor turns off and all internal circuitry enters low-power mode, consuming less than 1A. Bypass capacitor connection; to improve AC ripple rejection, connect a 10nF capacitor to GND. This will also provide a soft-start function. Output pin; should be decoupled with 2.2F ceramic capacitor.
Pin Configuration
SOT23-6 (Top View) SC70JW-8 (Top View)
IN GND EN
1
6
OUT GND BYP BYP OUT OUT OUT
1 2 3 4 8 7 6 5
2
5
3
4
GND EN IN IN
2
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3238.2008.05.1.7
PRODUCT DATASHEET
AAT3238
PowerLinear
TM
300mA MicroPowerTM High Performance LDO Linear Regulator
Absolute Maximum Ratings1
TA = 25C, unless otherwise noted. Symbol
VIN VENIN(MAX) IOUT TJ
Description
Input Voltage Maximum EN to Input Voltage DC Output Current Operating Junction Temperature Range
Value
6 0.3 PD/(VIN - VO) -40 to 150
Units
V V mA C
Recommended Operating Conditions
Symbol
VIN T
Description
Input Voltage Ambient Temperature Range2
Rating
(VOUT + VDO) to 5.5 -40 to +85
Units
V C
Thermal Information3
Symbol
JA PD
Description
Maximum Thermal Resistance Maximum Power Dissipation
Rating
150 667
Units
C/W mW
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 2. Mounted on a demo board. 3. To calculate minimum input voltage, use the following equation: VIN(MIN) = VOUT(MAX) + VDO(MAX) as long as VIN 2.5V.
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PRODUCT DATASHEET
AAT3238
PowerLinear
TM
300mA MicroPowerTM High Performance LDO Linear Regulator
Electrical Characteristics1
VIN = VOUT(NOM) + 1V for VOUT options greater than 1.5V. VIN = 2.5V for VOUT 1.5V. IOUT = 1mA, COUT = 2.2F, CIN = 1F, TA = -40C to +85C, unless otherwise noted. Typical values are TA = 25C. Symbol
VOUT IOUT VDO ISC IQ ISD VOUT/ VOUT*VIN VOUT(line) VOUT(load) tENDLY VEN(L) VEN(H) IEN PSRR TSD THYS eN TC
Description
Output Voltage Tolerance Output Current Dropout Voltage2, 3 Short-Circuit Current Ground Current Shutdown Current Line Regulation Dynamic Line Regulation Dynamic Load Regulation Enable Delay Time Enable Threshold Low Enable Threshold High Leakage Current on Enable Pin Power Supply Rejection Ratio Over-Temperature Shutdown Threshold Over-Temperature Shutdown Hysteresis Output Noise Output Voltage Temperature Coefficient
Conditions
IOUT = 1mA to 300mA TA = 25C TA = -40 to 85C
Min
-1.5 -2.5 300
Typ
Max
1.5 2.5
Units
% mA mV mA A %/V mV mV s V V A dB C C Vrms ppm/C
VOUT > 1.2V IOUT = 300mA VOUT < 0.4V VIN = 5V, No Load, EN = VIN VIN = 5V, EN = 0V VIN = VOUT + 1 to 5.0V VIN = VOUT + 1V to VOUT + 2V, IOUT = 300mA, TR/TF = 2s IOUT = 1mA to 300mA, TR < 5s BYP = Open
70
400 600 125
600 A 1 0.09
2.5 60 15 0.6 1.5
VEN = 5V IOUT = 10mA, CBYP = 10nF 1kHz 10kHz 1MHz 67 47 45 145 12 50 22
1
1. The AAT3238 is guaranteed to meet performance specifications over the -40C to +85C operating temperature range and is assured by design, characterization, and correlation with statistical process controls. 2. VDO is defined as VIN - VOUT when VOUT is 98% of nominal. 3. For VOUT < 2.1V, VDO = 2.5V - VOUT.
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3238.2008.05.1.7
PRODUCT DATASHEET
AAT3238
PowerLinear
TM
300mA MicroPowerTM High Performance LDO Linear Regulator
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25C.
Output Voltage vs. Temperature
3.20
Dropout Characteristics
1.203
3.00
Output Voltage (V)
Output Voltage (V)
1.202 1.201 1.200 1.199 1.198 1.197 1.196 -40 -30 -20 -10
IOUT = 0mA
2.80 2.60 2.40 2.20 2.00 2.70
IOUT = 300mA IOUT = 150mA IOUT = 100mA IOUT = 50mA
IOUT = 10mA
2.80
0
10 20
30
40
50 60
70 80
90 100
2.90
3.00
3.10
3.20
3.30
Temperature (C)
Input Voltage (V)
Dropout Voltage vs. Output Current
500 90.00 80.00
Ground Current vs. Input Voltage
Dropout Voltage (mV)
Ground Current (A)
450 400 350 300 250 200 150 100 50 0 0 50 100 150 200 250 300
70.00 60.00 50.00 40.00 30.00 20.00 10.00 0.00 2 2.5 3 3.5 4 4.5
85C 25C -40C
IOUT = 300mA IOUT = 0mA IOUT = 150mA IOUT = 50mA
IOUT = 10mA
Output Current (mA)
Input Voltage (V)
Quiescent Current vs. Temperature
100
Output Voltage vs. Temperature
1.203 1.202
Quiescent Current (A)
90
Output Voltage (V)
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120
80 70 60 50 40 30 20 10 0
1.201 1.200 1.199 1.198 1.197 1.196 -40 -30 -20 -10
0
10 20
30
40
50 60
70 80
90 100
Temperature (C)
Temperature (C)
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PRODUCT DATASHEET
AAT3238
PowerLinear
TM
300mA MicroPowerTM High Performance LDO Linear Regulator
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25C.
LDO Initial Power-Up Response Time
7 6 5 4 3 2 1 0 -1 -2
Turn-Off Response Time
(CBYP = 10nF)
Output Voltage (bottom) (V)
Input Voltage (top) (V)
6 5 4 3 2 1 0 -1
VEN (5V/div)
VOUT (1V/div)
Time (50s/div)
Time (50s/div)
Turn-On Time From Enable (VIN present)
(CBYP = 10nF)
6
Line Transient Response
3.04 3.03 3.02 3.01 3.00
VEN = 5V/div Input Voltage (V)
5 4 3 2
VIN
VOUT
1 0 2.99 2.98
VOUT = 1V/div Time (5s/div)
VIN = 4V
Time (100s/div)
Load Transient Response
2.90 500
Load Transient Response 300mA
400 300 200 100 0 3.00 800 700
Output Voltage (V)
2.85 2.80 2.75 2.70 2.65
Output Current (mA)
VOUT
Output Voltage (V)
2.90 2.80 2.70 2.60 2.50 2.40 2.30 2.20 2.10
Output Current (mA)
VOUT
600 500 400 300 200
IOUT
2.60 -100
IOUT
100 0 -100
Time (100s/div)
Time (10s/div)
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3238.2008.05.1.7
PRODUCT DATASHEET
AAT3238
PowerLinear
TM
300mA MicroPowerTM High Performance LDO Linear Regulator
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25C.
AAT3238 Self Noise
(COUT = 10F, Ceramic)
Noise Amplitude (V/rtHz)
1200
Over-Current Protection
10
Output Current (mA)
100 1000 10000
1000 800 600 400 200 0 -200
1
0.1 Band Power: 300Hz to 50kHz = 44.6Vrms/rtHz 100Hz to 100kHz = 56.3Vrms/rtHz
0.01
0.001 0.01
0.1
1
10
Time (20ms/div)
Frequency (kHz)
VIH and VIL vs. VIN
1.250 1.225 1.200 1.175 1.150 1.125 1.100 1.075 1.050 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIH
VIL
VIN (V)
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PRODUCT DATASHEET
AAT3238
PowerLinear
TM
300mA MicroPowerTM High Performance LDO Linear Regulator
Functional Block Diagram
IN
Active Feedback Control Over-Current Protection
OUT
OverTemperature Protection + Error Amplifier -
EN
Fast Start Control
Voltage Reference
BYP
GND
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 shutdown timing. This proprietary CMOS LDO has also been tailored for superior transient response characteristics. These traits are particularly important for applications that require fast power supply timing, such as GSM cellular telephone handsets. The high-speed turn-on capability of the AAT3238 is enabled through the implementation of a fast start control circuit, which accelerates the power-up behavior of fundamental control and feedback circuits within the LDO regulator. Fast turn-off response time is achieved by an active output 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 characteristics, 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, the design will allow for operation over a wide 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 rejection. Device self noise and PSRR will be improved by the addition of a small ceramic capacitor in this pin. However, increased values of CBYPASS may slow down the LDO regulator turn-on time. This LDO regulator has complete short-circuit and thermal protection. The integral combination of these two internal protection circuits gives the AAT3238 a comprehensive 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 datasheet for details on device operation at maximum output current loads.
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3238.2008.05.1.7
PRODUCT DATASHEET
AAT3238
PowerLinear
TM
300mA MicroPowerTM High Performance LDO Linear Regulator
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, for best device performance, a small ceramic capacitor should be placed between the bypass pin (BYP) and the device ground pin (GND). The value of CBYP may range from 470pF to 10nF. For lowest noise and 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 connection between the BYP pin and GND pin be direct and PCB traces should be as short as possible. Refer to the PCB Layout Recommendations section of this document 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 capacitor 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 noise and voltage regulation performance. For this reason, the use of a low leakage, high quality ceramic (NPO or C0G type) or film capacitor is highly recommended.
Applications Information
To assure the maximum possible performance is obtained from the AAT3238, please refer to the following application recommendations.
Input Capacitor
Typically, a 1F or larger capacitor is recommended for 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 centimeters 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 1F 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. There is no specific capacitor ESR 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
For proper load voltage regulation and operational stability, a capacitor is required between pins VOUT and GND. The COUT capacitor connection to the LDO regulator ground pin should be made as direct as practically possible for maximum device performance. The AAT3238 has been specifically designed to function with very low ESR ceramic capacitors. For best performance, ceramic capacitors are recommended. Typical output capacitor values for maximum output current conditions range from 1F to 10F. Applications utilizing the exceptionally low output noise and optimum power supply ripple rejection characteristics of the AAT3238 should use 2.2F or greater for COUT. 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 low as 0.47F.
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 counterparts. A ceramic capacitor typically has very low ESR, is lower cost, has a smaller PCB footprint, and is nonpolarized. Line and load transient response of the LDO regulator is improved by using low-ESR ceramic capacitors. Since ceramic capacitors are non-polarized, they are not prone to incorrect connection damage.
Equivalent Series Resistance
ESR is a very important characteristic to consider when selecting a capacitor. ESR is the internal series resistance associated with a capacitor that includes lead resistance, internal connections, size and area, material composition, and ambient temperature. Typically, capacitor ESR
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PRODUCT DATASHEET
AAT3238
PowerLinear
TM
300mA MicroPowerTM High Performance LDO Linear Regulator
conditions, the output of the LDO regulator will be current limited until the short-circuit condition is removed from the output or the LDO regulator package power dissipation exceeds the device thermal limit.
is measured in milliohms for ceramic capacitors and can range to more than several ohms for tantalum or aluminum electrolytic capacitors.
Ceramic Capacitor Materials
Ceramic capacitors less than 0.1F 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 composed 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 2.2F Y5V capacitor could be reduced to 1F over temperature; this could cause problems for circuit operation. X7R and X5R dielectrics are much more desirable. The temperature tolerance of X7R dielectric is better than 15%. Capacitor area is another contributor to ESR. Capacitors that are physically large in size will have a lower ESR when compared to a smaller sized capacitor of an equivalent material and capacitance value. These larger devices can improve circuit transient response when compared to an equal value capacitor in a smaller package size. Consult capacitor vendor datasheets carefully when selecting capacitors for LDO regulators.
Thermal Protection
The AAT3238 has an internal thermal protection circuit which will turn on when the device die temperature exceeds 145C. 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 shutdown state until the internal die temperature falls back below the 145C trip point. The combination and interaction between the short-circuit and thermal protection systems allow the LDO regulator 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 conditions. This is an important characteristic for applications where the output current may drop to zero.
Enable Function
The AAT3238 features an LDO regulator enable/ disable function. This pin (EN) is active high and is compatible with CMOS logic. To assure the LDO regulator will switch on, the EN turn-on control level must be greater 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 internal 1.5k resistor is connected between VOUT and GND. This is intended to discharge COUT when the LDO regulator is disabled. The internal 1.5k has no adverse effect on device turn-on time.
Reverse Output-to-Input Voltage Conditions and Protection
Under normal operating conditions, a parasitic diode exists between the output and input of the LDO regulator. 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 current 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 shutdown, thus preventing VOUT from exceeding VIN. In applications where there is a greater danger of VOUT exceeding 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 diode forward voltage should be less than 0.45V.
Short-Circuit Protection
The AAT3238 contains an internal short-circuit protection circuit that will trigger when the output load current exceeds the internal threshold limit. Under short-circuit
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3238.2008.05.1.7
PRODUCT DATASHEET
AAT3238
PowerLinear
TM
300mA MicroPowerTM High Performance LDO Linear Regulator
Ordering Information
Output Voltage
1.2V 1.5V 1.6V 1.8V 1.85V 2.0V 2.3V 2.5V 2.7V 2.8V 2.85 3.0V 3.3V 3.5V 1.2V 1.45V 1.5V 1.8V 2.0V 2.3V 2.5V 2.7V 2.8V 2.85 3.0V 3.3V 3.5V
Package
SOT23-6 SOT23-6 SOT23-6 SOT23-6 SOT23-6 SOT23-6 SOT23-6 SOT23-6 SOT23-6 SOT23-6 SOT23-6 SOT23-6 SOT23-6 SOT23-6 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8
Marking1
KIXYY JGXYY JSXYY JRXYY JFXYY
Part Number (Tape and Reel)2
AAT3238IGU-1.2-T1 AAT3238IGU-1.5-T1 AAT3238IGU-1.6-T1 AAT3238IGU-1.8-T1 AAT3238IGU-1.85-T1 AAT3238IGU-2.0-T1 AAT3238IGU-2.3-T1 AAT3238IGU-2.5-T1 AAT3238IGU-2.7-T1 AAT3238IGU-2.8-T1 AAT3238IGU-2.85-T1 AAT3238IGU-3.0-T1 AAT3238IGU-3.3-T1 AAT3238IGU-3.5-T1 AAT3238IJS-1.2-T1 AAT3238IJS-1.45-T1 AAT3238IJS-1.5-T1 AAT3238IJS-1.8-T1 AAT3238IJS-2.0-T1 AAT3238IJS-2.3-T1 AAT3238IJS-2.5-T1 AAT3238IJS-2.7-T1 AAT3238IJS-2.8-T1 AAT3238IJS-2.85-T1 AAT3238IJS-3.0-T1 AAT3238IJS-3.3-T1 AAT3238IJS-3.5-T1
KUXYY
QGXYY
KIXYY JGXYY
FCXYY VOXYY
All AnalogicTech products are offered in Pb-free packaging. The term "Pb-free" means semiconductor products that are in compliance with current RoHS standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more information, please visit our website at http://www.analogictech.com/about/quality.aspx.
1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD.
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PRODUCT DATASHEET
AAT3238
PowerLinear
TM
300mA MicroPowerTM High Performance LDO Linear Regulator
Package Information
SOT23-6
2.85 0.15 1.90 BSC 0.95 BSC
1.575 0.125
1.10 0.20
2.80 0.20 1.20 0.25
0.075 0.075
0.15 0.07 4 4
GAUGE PLANE
10 5 0.40 0.10 x 6
0.60 REF
0.45 0.15
0.10 BSC
SC70JW-8
0.50 BSC 0.50 BSC 0.50 BSC
1.75 0.10 0.225 0.075 2.00 0.20
2.20 0.20
0.048REF 0.85 0.15 0.15 0.05
1.10 MAX
0.100
7 3
0.45 0.10 2.10 0.30
4 4
All dimensions in millimeters.
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0.05 0.05
3238.2008.05.1.7
PRODUCT DATASHEET
AAT3238
PowerLinear
TM
300mA MicroPowerTM High Performance LDO Linear Regulator
Advanced Analogic Technologies, Inc. 3230 Scott Boulevard, Santa Clara, CA 95054 Phone (408) 737-4600 Fax (408) 737-4611
(c) Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice. Except as provided in AnalogicTech's terms and conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied warranty relating to the sale and/or use of AnalogicTech products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders.
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