AAT3238IGU-3.0-T1 [ANALOGICTECH]
300mA MicroPower⑩ High Performance LDO Linear Regulator; 300毫安MicroPower⑩高性能LDO线性稳压器
| 型号： | AAT3238IGU-3.0-T1 |
| 厂家： | 
ADVANCED ANALOGIC TECHNOLOGIES |
| 描述： | 300mA MicroPower⑩ High Performance LDO Linear Regulator |
| 文件： | 总14页 (文件大小：318K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AAT3238
300mA MicroPower™
High Performance LDO Linear Regulator
™
PowerLinear
General Description
Features
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.
•
•
•
•
•
•
•
•
•
•
•
Low Dropout: 400mV at 300mA
Guaranteed 300mA Output
High Accuracy: ±1.5%
70µA 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
Other features include low quiescent current, typical-
ly 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 pro-
tection under extreme operating conditions.
•
•
•
•
•
Factory-Programmed Output Voltages
SOT23 6-Pin or SC70JW 8-Pin Package
The AAT3238 also features a low-power shutdown
mode for extended battery life. A reference bypass
pin has been provided to improve PSRR perform-
ance and output noise by connecting a small exter-
nal capacitor from the AAT3238's reference output to
ground.
Applications
The AAT3238 is available in a Pb-free, space-saving
6-pin SOT23 or 8-pin SC70JW package in factory-
programmed voltages.
•
•
•
•
•
Cellular Phones
Digital Cameras
Notebook Computers
Personal Portable Electronics
Portable Communication Devices
Typical Application
VIN
VOUT
IN
OUT
BYP
AAT3238
ON/OFF
EN
GND
1μF
10nF
2.2μF
GND
GND
3238.2006.11.1.6
1
AAT3238
300mA MicroPower™
High Performance LDO Linear Regulator
Pin Descriptions
Pin #
Symbol
Function
SOT23-6
SC70JW-8
1
5, 6
IN
Input voltage pin; should be decoupled with 1µF or greater
capacitor.
2, 5
3
8
7
GND
EN
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 1µA.
4
6
1
BYP
OUT
Bypass capacitor connection; to improve AC ripple rejection,
connect a 10nF capacitor to GND. This will also provide a soft-
start function.
2, 3, 4
Output pin; should be decoupled with 2.2µF ceramic capacitor.
Pin Configuration
SOT23-6
(Top View)
SC70JW-8
(Top View)
6
1
OUT
GND
BYP
IN
GND
EN
8
7
6
5
1
2
3
4
GND
EN
IN
BYP
OUT
OUT
OUT
2
3
5
4
IN
2
3238.2006.11.1.6
AAT3238
300mA MicroPower™
High Performance LDO Linear Regulator
Absolute Maximum Ratings1
TA = 25°C, unless otherwise noted.
Symbol
Description
Value
Units
VIN
VENIN(MAX)
IOUT
Input Voltage
6
V
V
Maximum EN to Input Voltage
DC Output Current
0.3
PD/(VIN - VO)
-40 to 150
mA
°C
TJ
Operating Junction Temperature Range
Recommended Operating Conditions
Symbol
Description
Rating
Units
VIN
T
Input Voltage
Ambient Temperature Range2
(VOUT + VDO) to 5.5
-40 to +85
V
°C
Thermal Information3
Symbol
Description
Rating
Units
ΘJA
PD
Maximum Thermal Resistance
Maximum Power Dissipation
150
667
°C/W
mW
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at condi-
tions 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.
3238.2006.11.1.6
3
AAT3238
300mA MicroPower™
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 = 2.2µF,
CIN = 1µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C.
Symbol Description
Conditions
Min Typ Max Units
TA = 25°C
-1.5
1.5
2.5
VOUT
Output Voltage Tolerance
IOUT = 1mA to 300mA
%
TA = -40 to 85°C -2.5
300
IOUT
VDO
ISC
Output Current
VOUT > 1.2V
IOUT = 300mA
VOUT < 0.4V
mA
mV
mA
µA
Dropout Voltage2, 3
Short-Circuit Current
Ground Current
400 600
600
IQ
VIN = 5V, No Load, EN = VIN
VIN = 5V, EN = 0V
70
125
1
ISD
Shutdown Current
µA
ΔVOUT
VOUT*ΔVIN
/
Line Regulation
VIN = VOUT + 1 to 5.0V
0.09
%/V
mV
VIN = VOUT + 1V to VOUT + 2V,
ΔVOUT(line) Dynamic Line Regulation
2.5
IOUT = 300mA, TR/TF = 2µs
IOUT = 1mA to 300mA, TR < 5µs
BYP = Open
ΔVOUT(load) Dynamic Load Regulation
60
15
mV
µs
V
tENDLY
VEN(L)
VEN(H)
IEN
Enable Delay Time
Enable Threshold Low
Enable Threshold High
0.6
1
1.5
V
Leakage Current on Enable Pin VEN = 5V
µA
1kHz
67
47
45
PSRR
TSD
Power Supply Rejection Ratio
IOUT = 10mA, CBYP = 10nF 10kHz
1MHz
dB
°C
Over-Temperature Shutdown
Threshold
145
Over-Temperature Shutdown
Hysteresis
THYS
eN
12
50
22
°C
Output Noise
µVrms
ppm/°C
Output Voltage Temperature
Coefficient
TC
1. The AAT3238 is guaranteed to meet performance specifications over the -40°C to +85°C 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
.
4
3238.2006.11.1.6
AAT3238
300mA MicroPower™
High Performance LDO Linear Regulator
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Dropout Voltage vs. Temperature
Dropout Characteristics
3.20
540
480
420
360
300
240
180
120
60
IL = 300mA
IL = 150mA
3.00
IOUT = 0mA
2.80
IOUT = 300mA
IOUT = 150mA
IOUT = 100mA
IOUT = 50mA
IL = 100mA
2.60
2.40
2.20
2.00
IOUT = 10mA
IL = 50mA
0
-40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90 100 110 120
2.70
2.80
2.90
3.00
3.10
3.20
3.30
Temperature (°C)
Input Voltage (V)
Dropout Voltage vs. Output Current
Ground Current vs. Input Voltage
90.00
80.00
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0.00
500
450
400
350
300
250
200
150
100
50
IOUT = 300mA
85°C
IOUT = 150mA
IOUT = 50mA
25°C
IOUT = 0mA
IOUT = 10mA
-40°C
0
0
50
100
150
200
250
300
2
2.5
3
3.5
4
4.5
5
Input Voltage (V)
Output Current (mA)
Quiescent Current vs. Temperature
Output Voltage vs. Temperature
100
90
80
70
60
50
40
30
20
10
0
1.203
1.202
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 90 100 110 120
-40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90 100
Temperature (°C)
Temperature (°C)
3238.2006.11.1.6
5
AAT3238
300mA MicroPower™
High Performance LDO Linear Regulator
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Initial Power-Up Response Time
(CBYP = 10nF)
Turn-Off Response Time
(CBYP = 10nF)
VEN (5V/div)
VEN (5V/div)
VOUT (1V/div)
VOUT (1V/div)
Time (50µs/div)
Time (400µs/div)
Line Transient Response
Turn-On Time From Enable (VIN present)
(CBYP = 10nF)
6
5
4
3
2
1
0
3.04
3.03
3.02
3.01
3.00
2.99
2.98
VEN = 5V/div
VIN
VOUT
VIN = 4V
VOUT = 1V/div
Time (5µs/div)
Time (100µs/div)
Load Transient Response
Load Transient Response 300mA
2.90
2.85
500
400
300
200
100
0
3.00
2.90
2.80
2.70
2.60
2.50
2.40
2.30
2.20
2.10
800
700
600
500
400
300
200
100
0
VOUT
2.80
2.75
2.70
2.65
2.60
VOUT
IOUT
IOUT
-100
-100
Time (100µs/div)
Time (10µs/div)
6
3238.2006.11.1.6
AAT3238
300mA MicroPower™
High Performance LDO Linear Regulator
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Over-Current Protection
AAT3238 Self Noise
(COUT = 10μF, Ceramic)
1200
1000
800
600
400
200
0
10
1
0.1
Band Power:
300Hz to 50kHz = 44.6μVrms/rtHz
100Hz to 100kHz = 56.3μVrms/rtHz
0.01
0.001
-200
0.01
0.1
1
10
100
1000
10000
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
VIH
VIL
2.5
3.0
3.5
4.0
4.5
5.0
5.5
VIN (V)
3238.2006.11.1.6
7
AAT3238
300mA MicroPower™
High Performance LDO Linear Regulator
Functional Block Diagram
OUT
IN
Active
Feedback
Control
Over-Current
Protection
Over-
Temperature
Protection
+
Error
Amplifier
-
Fast
Start
Control
Voltage
Reference
EN
BYP
GND
required. This rapid transient response behavior is
accomplished through the implementation of an
active error amplifier feedback control. This propri-
etary circuit design is unique to this MicroPower LDO
regulator.
Functional Description
The AAT3238 is intended for LDO regulator applica-
tions where output current load requirements range
from no load to 300mA.
The LDO regulator output has been specifically opti-
mized to function with low-cost, low-ESR ceramic
capacitors. However, the design will allow for opera-
tion over a wide range of capacitor types.
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.
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.
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 behav-
ior of fundamental control and feedback circuits with-
in the LDO regulator.
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
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.
dissipation properties.
Refer to the Thermal
The AAT3238 has very fast transient response char-
acteristics, which is an important feature for applica-
tions where fast line and load transient response is
Considerations section of this datasheet for details on
device operation at maximum output current loads.
8
3238.2006.11.1.6
AAT3238
300mA MicroPower™
High Performance LDO Linear Regulator
In low output current applications where output
load is less than 10mA, the minimum value for
Applications Information
C
OUT can be as low as 0.47µF.
To assure the maximum possible performance is
obtained from the AAT3238, please refer to the fol-
lowing application recommendations.
Bypass Capacitor and Low Noise
Applications
Input Capacitor
A bypass capacitor pin is provided to enhance the
low noise characteristics of the AAT3238 LDO reg-
ulator. 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 rejec-
tion performance, a 10nF capacitor should be
used. To practically realize the highest power sup-
ply ripple rejection and lowest output noise per-
formance, 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.
Typically, a 1µF or larger capacitor is recommend-
ed 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
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 capac-
itors 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 with-
stand input current surges from low impedance
sources such as batteries in portable devices.
There is a relationship between the bypass capac-
itor 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.
Output Capacitor
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.
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.
DC leakage on this pin can affect the LDO regula-
tor output noise and voltage regulation perform-
ance. For this reason, the use of a low leakage,
high quality ceramic (NPO or C0G type) or film
capacitor is highly recommended.
The AAT3238 has been specifically designed to func-
tion with very low ESR ceramic capacitors. For best
performance, ceramic capacitors are recommended.
Typical output capacitor values for maximum out-
put current conditions range from 1µF to 10µF.
Applications utilizing the exceptionally low output
noise and optimum power supply ripple rejection
characteristics of the AAT3238 should use 2.2µF or
Capacitor Characteristics
Ceramic composition capacitors are highly recom-
mended over all other types of capacitors for use
with the AAT3238. Ceramic capacitors offer many
advantages over their tantalum and aluminum elec-
trolytic counterparts. A ceramic capacitor typically
greater for COUT
.
If desired, COUT may be
increased without limit.
3238.2006.11.1.6
9
AAT3238
300mA MicroPower™
High Performance LDO Linear Regulator
has very low ESR, is lower cost, has a smaller PCB
footprint, and is non-polarized. Line and load tran-
sient 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.
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 volt-
age 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.
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 is measured in milliohms
for ceramic capacitors and can range to more than
several ohms for tantalum or aluminum electrolytic
capacitors.
When the LDO regulator is in shutdown mode, an
internal 1.5kΩ resistor is connected between VOUT
and GND. This is intended to discharge COUT when
the LDO regulator is disabled. The internal 1.5kΩ
has no adverse effect on device turn-on time.
Ceramic Capacitor Materials: Ceramic capaci-
tors less than 0.1µF are typically made from NPO
or C0G materials. NPO and C0G materials gener-
ally 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 recom-
mended 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 reduced to 1µF 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%.
Short-Circuit Protection
The AAT3238 contains an internal short-circuit pro-
tection circuit that will trigger when the output load
current exceeds the internal threshold limit. Under
short-circuit conditions, the output of the LDO reg-
ulator 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.
Thermal Protection
The AAT3238 has an internal thermal protection cir-
cuit which will turn on when the device die temper-
ature exceeds 145°C. The internal thermal protec-
tion 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 145°C trip point.
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 capaci-
tance value. These larger devices can improve cir-
cuit transient response when compared to an equal
value capacitor in a smaller package size.
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.
Consult capacitor vendor datasheets carefully
when selecting capacitors for LDO regulators.
10
3238.2006.11.1.6
AAT3238
300mA MicroPower™
High Performance LDO Linear Regulator
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.
No-Load Stability
The AAT3238 is designed to maintain output volt-
age regulation and stability under operational no-
load conditions. This is an important characteristic
for applications where the output current may drop
to zero.
In applications where there is a possibility of VOUT
exceeding VIN for brief amounts of time during nor-
mal operation, the use of a larger value CIN capaci-
tor 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.
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, main-
taining a reverse bias on the internal parasitic
diode. Conditions where VOUT might exceed VIN
3238.2006.11.1.6
11
AAT3238
300mA MicroPower™
High Performance LDO Linear Regulator
Ordering Information
Output Voltage
Package
Marking1
Part Number (Tape and Reel)2
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
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
KIXYY
JGXYY
JSXYY
JRXYY
JFXYY
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
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/pbfree.
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
12
3238.2006.11.1.6
AAT3238
300mA MicroPower™
High Performance LDO Linear Regulator
Package Information
SOT23-6
0.15
2.85
1.90 BSC
0.95 BSC
0.15 0.07
GAUGE PLANE
10° 5°
0.60 REF
0.45
0.40 0.10 × 6
0.15
0.10 BSC
SC70JW-8
0.50 BSC 0.50 BSC 0.50 BSC
0.225 0.075
2.00 0.20
0.048REF
0.100
0.45 0.10
4° 4°
7° 3°
2.10 0.30
All dimensions in millimeters.
3238.2006.11.1.6
13
AAT3238
300mA MicroPower™
High Performance LDO Linear Regulator
© Advanced Analogic Technologies, Inc.
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830 E. Arques Avenue, Sunnyvale, CA 94085
Phone (408) 737-4600
Fax (408) 737-4611
14
3238.2006.11.1.6
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