AAT3239ITS-3.3-T1 [ANALOGICTECH]
500mA MicroPower LDO; 500毫安微功率LDO
| 型号： | AAT3239ITS-3.3-T1 |
| 厂家： | 
ADVANCED ANALOGIC TECHNOLOGIES |
| 描述： | 500mA MicroPower LDO |
| 文件： | 总14页 (文件大小：279K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AAT3239
500mA MicroPower™ LDO
™
PowerLinear
General Description
Features
The AAT3239 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 AAT3239 has
been specifically designed for high-speed turn-on
and turn-off performance, fast transient response,
good power supply rejection ratio (PSRR), and is
reasonably low noise, making it ideal for powering
sensitive circuits with fast switching requirements.
•
•
•
•
•
•
•
•
•
•
•
500mA Output Current
Low Dropout: 400mV at 300mA
High Accuracy: ±2.0%
70µA Quiescent Current
Fast Line and Load Transient Response
High-Speed Device Turn-On and Shutdown
High Power Supply Rejection Ratio
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
TSOPJW 8-Pin Package
Other features include low quiescent current, typical-
ly 70µA, and low dropout voltage which is typically
less than 400mV at 300mA. The device is output
short-circuit protected and has a thermal shutdown
circuit for additional protection under extreme operat-
ing conditions.
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•
•
•
The AAT3239 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 AAT3239's reference output to
ground.
Applications
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•
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•
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Cellular Phones
Digital Cameras
Notebook Computers
Personal Portable Electronics
Portable Communication Devices
The AAT3239 is available in a Pb-free, 8-pin
TSOPJW package in factory-programmed voltages.
Typical Application
VIN
VOUT
IN
OUT
AAT3239
BYP
ON/OFF
1µF
EN
GND
10nF
2.2µF
GND
GND
3239.2006.03.1.2
1
AAT3239
500mA MicroPower™ LDO
Pin Descriptions
Pin #
Symbol
Function
1
BYP
Bypass capacitor connection; to improve AC ripple rejection, connect a 10nF
capacitor to GND. This will also provide a soft-start function.
2
EN
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, con-
suming less than 1µA.
3
4
OUT
IN
Output pin; should be decoupled with 2.2µF ceramic capacitor.
Input voltage pin; should be decoupled with 1µF or greater capacitor.
Ground connection pin.
5, 6, 7, 8
GND
Pin Configuration
TSOPJW-8
(Top View)
1
2
3
4
8
7
6
5
BYP
EN
GND
GND
GND
GND
OUT
IN
2
3239.2006.03.1.2
AAT3239
500mA MicroPower™ LDO
Absolute Maximum Ratings1
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
Thermal Information2
Symbol
Description
Rating
Units
ΘJA
PD
Maximum Thermal Resistance
Maximum Power Dissipation3 (TA = 25°C)
90
°C/W
W
1.11
Recommended Operating Conditions
Symbol
Description
Rating
Units
VIN
T
Input Voltage4
(VOUT + VDO) to 5.5
-40 to +85
V
Ambient Temperature Range
°C
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. Derate 11.1mW/°C above 25°C.
4. To calculate minimum input voltage, use the following equation: VIN(MIN) = VOUT(MAX) + VDO(MAX) as long as VIN ≥ 2.5V.
3239.2006.03.1.2
3
AAT3239
500mA MicroPower™ LDO
Electrical Characteristics1
VIN = VOUT(NOM) + 1.2V for VOUT options greater than 1.5V. VIN = 2.5 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
TA = -40 to 85°C -2.5
TA = 25°C -2.0
-1.5
1.5
2.5
2.0
3.5
IOUT = 1mA to 300mA
VOUT
Output Voltage Tolerance
%
IOUT = 1mA to 500mA
TA = -40 to 85°C -3.5
500
IOUT
VDO
Output Current
VOUT > 1.2V
IOUT = 300mA
IOUT = 500mA
VOUT < 0.4V
mA
mV
V
400 600
0.8 1.2
600
Dropout Voltage2, 3
ISC
IQ
Short-Circuit Current
Ground Current
mA
µA
µA
VIN = 5V, No Load, EN = VIN
VIN = 5V, EN = 0V
70 125
1
ISD
Shutdown Current
∆VOUT
VOUT*∆VIN
/
Line Regulation
VIN = VOUT + 1 to 5.0V
0.09
2.5
%/V
mV
mV
V
IN = VOUT + 1V to VOUT + 2V,
IOUT = 500mA, TR/TF = 2µs
OUT = 1mA to 300mA, TR<5µs
∆VOUT(line) Dynamic Line Regulation
∆VOUT(load) Dynamic Load Regulation
I
100
120
15
IOUT = 1mA to 500mA, TR<5µs
BYP = Open
tENDLY
VEN(L)
VEN(H)
IEN
Enable Delay Time
µs
V
Enable Threshold Low
Enable Threshold High
0.6
1.5
V
Leakage Current on Enable Pin VEN = 5V
1
67
µA
1kHz
IOUT = 10mA,
PSRR
TSD
Power Supply Rejection Ratio
10kHz
1MHz
47
dB
°C
CBYP = 10nF
45
Over-Temperature Shutdown
Threshold
145
Over-Temperature Shutdown
Hysteresis
THYS
eN
12
50
22
°C
Output Noise
Noise Power BW = 300Hz to 50kHz
µVrms
ppm/°C
Output Voltage Temperature
Coefficient
TC
1. The AAT3239 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
3239.2006.03.1.2
AAT3239
500mA MicroPower™ LDO
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Dropout Voltage vs. Temperature
Dropout Characteristics
3.20
3.00
2.80
2.60
2.40
2.20
2.00
1.80
1.60
1.40
900
840
IOUT = 0mA
IL = 400mA
IL = 500mA
780
720
660
600
540
480
420
360
300
240
180
120
60
IOUT = 500mA
IOUT = 300mA
IL = 300mA
IOUT = 150mA
IOUT = 100mA
IL = 100mA
IL = 50mA
IL = 150mA
IOUT = 50mA
IOUT = 10mA
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 3.40 3.50 3.60 3.70
Temperature (°C)
Input Voltage (V)
Dropout Voltage vs. Output Current
Ground Current vs. Input Voltage
90
80
70
60
50
40
30
20
10
0
900
800
700
600
500
400
300
200
100
0
IOUT = 500mA
85°C
IOUT = 300mA
IOUT = 0mA
25°C
IOUT = 150mA
IOUT = 10mA
-40°C
IOUT = 50mA
0
50
100 150 200 250 300 350 400 450 500
2
2.5
3
3.5
4
4.5
5
Input Voltage (V)
Output Current (mA)
Output Voltage vs. Temperature
Quiescent Current vs. Temperature
1.203
1.202
1.201
1.200
1.199
1.198
1.197
1.196
100
90
80
70
60
50
40
30
20
10
0
-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)
3239.2006.03.1.2
5
AAT3239
500mA MicroPower™ LDO
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Initial Power-Up Response Time
(CBYP = 10nF)
Turn-On Time From Enable (VIN present)
(CBYP = 10nF)
VEN = 5V/div
VEN (5V/div)
VIN = 4V
VOUT = 1V/div
VOUT (1V/div)
Time (5µs/div)
Time (400µs/div)
Turn-Off Response Time
(CBYP = 10nF)
Line Transient Response
6
3.04
VEN (5V/div)
5
3.03
3.02
3.01
3.00
2.99
2.98
VIN
4
3
2
VOUT
1
VOUT (1V/div)
0
Time (50µs/div)
Time (100µs/div)
Load Transient Response 100mA
Load Transient Response 300mA
1.90
300
200
100
0
2.00
1.90
1.80
1.70
1.60
1.50
1.40
750
600
450
300
150
0
VOUT
VOUT
1.85
1.80
1.75
IOUT
IOUT
1.70
-100
Time (100µs/div)
Time (100µs/div)
6
3239.2006.03.1.2
AAT3239
500mA MicroPower™ LDO
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Load Transient Response 500mA
AAT3239 Self Noise
(COUT = 10µF, ceramic)
2.1
2
1000
900
800
700
600
500
400
300
200
100
0
1.9
10
1
VOUT
1.8
1.7
1.6
1.5
1.4
1.3
0.1
Band Power:
300Hz to 50kHz = 44.6µVrms/rtHz
100Hz to 100kHz = 56.3µVrms/rtHz
IOUT
0.01
0.001
1.2
1.1
1
0.01
0.1
1
10
100
1000
10000
Time (100µs/div)
Frequency (kHz)
Over-Current Protection
VIH and VIL vs. VIN
1200
1000
800
600
400
200
0
1.250
1.225
1.200
1.175
1.150
1.125
1.100
1.075
1.050
VIH
VIL
-200
2.5
3.0
3.5
4.0
4.5
5.0
5.5
Time (20ms/div)
Input Voltage (V)
3239.2006.03.1.2
7
AAT3239
500mA MicroPower™ LDO
Functional Block Diagram
OUT
IN
Active
Feedback
Control
Over-Current
Protection
Over-
Temperature
Protection
+
Error
Amplifier
-
Fast
Start
Control
Voltage
Reference
EN
BYP
GND
applications where fast line and load transient
response are 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.
Functional Description
The AAT3239 is intended for LDO regulator appli-
cations where output current load requirements
range from no load to 500mA. Refer to the Thermal
Considerations discussion of this datasheet for
details on maximum power dissipation.
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.
The advanced circuit design of the AAT3239 has
been specifically optimized for very fast start-up
and shutdown timing. This CMOS LDO has been
tailored for superior transient response characteris-
tics, a trait which is particularly important for appli-
cations 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 capaci-
tor 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 AAT3239
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.
This LDO regulator has complete short-circuit and
thermal protection. The integral combination of
these two internal protection circuits gives the
AAT3239 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 discussion of this datasheet
for details on device operation at maximum output
current loads.
Fast turn-off response time is achieved by an
active output pull-down circuit, which is enabled
when the LDO regulator is placed in shutdown
mode. This active fast shutdown circuit has no
adverse effect on normal device operation.
The AAT3239 has very fast transient response
characteristics, which is an important feature for
8
3239.2006.03.1.2
AAT3239
500mA MicroPower™ LDO
Bypass Capacitor and Low Noise
Applications
Applications Information
To assure the maximum possible performance is
obtained from the AAT3239, please refer to the fol-
lowing application recommendations.
A bypass capacitor pin is provided to enhance the
low noise characteristics of the AAT3239 LDO regu-
lator. The bypass capacitor is not necessary for
operation of the AAT3239. 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 pos-
sible 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 capac-
itor connection between the BYP pin and GND pin be
direct and PCB traces should be as short as possi-
ble. Refer to the PCB Layout Recommendations
section of this document for examples.
Input Capacitor
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 AAT3239 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.
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.
Ceramic, tantalum, or aluminum electrolytic capac-
itors may be selected for CIN. There is no specific
capacitor ESR requirement for CIN. However, for
500mA 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.
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.
Output Capacitor
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.
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.
Capacitor Characteristics
The AAT3239 has been specifically designed to func-
tion with very low ESR ceramic capacitors. For best
performance, ceramic capacitors are recommended.
Ceramic composition capacitors are highly recom-
mended over all other types of capacitors for use
with the AAT3239. Ceramic capacitors offer many
advantages over their tantalum and aluminum elec-
trolytic counterparts. A ceramic capacitor typically
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.
Typical output capacitor values for maximum output
current conditions range from 1µF to 10µF.
Applications utilizing the exceptionally low output
noise and optimum power supply ripple rejection
characteristics of the AAT3239 should use 2.2µF 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 0.47µF.
3239.2006.03.1.2
9
AAT3239
500mA MicroPower™ LDO
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.
Short-Circuit Protection
The AAT3239 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 LDO regu-
lator package power dissipation exceeds the
device thermal limit.
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 rec-
ommended 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%.
Thermal Protection
The AAT3239 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 capacitance
value. These larger devices can improve circuit tran-
sient 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.
No-Load Stability
Consult capacitor vendor datasheets carefully
when selecting capacitors for LDO regulators.
The AAT3239 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.
Enable Function
The AAT3239 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.
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
10
3239.2006.03.1.2
AAT3239
500mA MicroPower™ LDO
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.
Constants for the AAT3239 are TJ(MAX), the maxi-
mum junction temperature for the device which is
125°C, and TJA = 90°C/W, the package thermal
resistance. Typically, maximum conditions are calcu-
lated at the maximum operating temperature of TA =
85°C and under normal ambient conditions where
TA = 25°C. Given TA = 85°C, the maximum package
power dissipation is 444mW. At TA = 25°C, the max-
imum package power dissipation is 1.11W.
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 0.45 volts.
The maximum continuous output current for the
AAT3239 is a function of the package power dissi-
pation and the input-to-output voltage drop across
the LDO regulator. Refer to the following simple
equation:
PD(MAX)
VIN - VOUT
IOUT(MAX)
<
Thermal Considerations and High
Output Current Applications
The AAT3239 is designed to deliver a continuous
output load current of 500mA under normal opera-
tions. The short-circuit current limit is greater than
500mA, typically active at 600mA.
For example, if VIN = 4.2V, VOUT = 1.8V, and TA =
25°C, IOUT(MAX) < 463mA. If the output load current
were to exceed 463mA or if the ambient tempera-
ture were to increase, the internal die temperature
would increase. If the condition remained constant,
the LDO regulator thermal protection circuit would
activate.
The limiting characteristics for the maximum output
load current safe operating area is essentially pack-
age power dissipation, the internal preset thermal
limit of the device, and the input-to-output voltage
drop across the AAT3239. In order to obtain high
operating currents, careful device layout and circuit
operating conditions need to be taken into account.
To determine the maximum output current for a
given output voltage, refer to the following equa-
tion. This calculation accounts for the total power
dissipation of the LDO regulator, including that
caused by ground current.
The following discussions will assume the LDO reg-
ulator is mounted on a printed circuit board utilizing
the minimum recommended footprint as stated in
the layout considerations section of this document.
At any given ambient temperature (TA), the maxi-
mum package power dissipation can be determined
by the following equation:
PD(MAX) = (VIN - VOUT)IOUT + (VIN x IGND
)
This formula can be solved for IOUT to determine the
maximum output current.
PD(MAX) - (VIN × IGND
VIN - VOUT
)
IOUT
=
TJ(MAX) - TA
θJA
PD(MAX)
=
3239.2006.03.1.2
11
AAT3239
500mA MicroPower™ LDO
The following is an example for an AAT3239 set for
a 1.5 volt output:
continuous input level for VOUT = 1.5V at 500mA for
TA = 25°C. To maintain this high input voltage and
output current level, the LDO regulator must be
operated in a duty-cycled mode. Refer to the follow-
ing calculation for duty cycle operation:
VOUT
VIN
= 1.5V
= 4.2V
= 125µA
IGND = 125µA
IOUT = 500mA
IGND
1.11W - (4.2V × 125µA)
4.2 - 1.5
IOUT
=
VIN = 4.2V
VOUT = 1.5V
I
OUT(MAX) = 411mA
100(PD(MAX)
)
%DC =
%DC =
(VIN - VOUT)IOUT + VIN × IGND
From the discussion above, PD(MAX) was determined
to equal 1.11W at TA = 25°C.
100(1.11W)
(4.2V - 1.5V)500mA + 4.2V × 125µA
Thus, the AAT3239 can sustain a constant 1.5V out-
put at a 411mA load current at an ambient tempera-
ture of 25°C. Higher input-to-output voltage differ-
entials can be obtained with the AAT3239, while
maintaining device functions within the thermal safe
operating area. To accomplish this, the device ther-
mal resistance must be reduced by increasing the
heat sink area or by operating the LDO regulator in
a duty-cycled mode.
%DC = 82%
D(MAX) is assumed to be 1.1W
P
For a 500mA output current and a 2.7V drop across
the AAT3239 at an ambient temperature of 25°C,
the maximum on-time duty cycle for the device
would be 82%.
The following curves show the safe operating area
for duty-cycled operation from ambient room tem-
perature to the maximum operating level.
For example, an application requires VIN = 4.2V
while VOUT = 1.5V at a 500mA load and TA = 25°C.
VIN is greater than 3.7V, which is the maximum safe
Device Duty Cycle vs. VDROP
(VOUT = 1.5V @ 25°C)
Device Duty Cycle vs. VDROP
(VOUT = 1.5V @ 85°C)
3.5
3
3.5
3
700mA
450mA
2.5
2.5
2
2
600mA
400mA
1.5
1.5
500mA
400mA
1
350mA
1
0.5
0
0.5
300mA
0
0
10
20
30
40
50
60
70
80
90
100
0
10
20
30
40
50
60
70
80
90
100
Duty Cycle (%)
Duty Cycle (%)
12
3239.2006.03.1.2
AAT3239
500mA MicroPower™ LDO
Evaluation Board Layout
The AAT3239 evaluation layout follows the recom-
mend printed circuit board layout procedures and
can be used as an example for good application
layouts.
Note: Board layout shown is not to scale.
Figure 3: Evaluation Board
Component Side Layout.
Figure 4: Evaluation Board
Solder Side Layout.
Figure 5: Evaluation Board Top Side
Silk Screen Layout/Assembly Drawing.
3239.2006.03.1.2
13
AAT3239
500mA MicroPower™ LDO
Ordering Information
Output Voltage
Package
Marking1
Part Number (Tape and Reel)2
1.5V
1.8V
1.85V
2.5V
3.3V
TSOPJW-8
TSOPJW-8
TSOPJW-8
TSOPJW-8
TSOPJW-8
JVXYY
NHXYY
JWXYY
QXXYY
MAXYY
AAT3239ITS-1.5-T1
AAT3239ITS-1.8-T1
AAT3239ITS-1.85-T1
AAT3239ITS-2.5-T1
AAT3239ITS-3.3-T1
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.
Package Information
TSOPJW-8
0.325 0.075
0.65 BSC 0.65 BSC 0.65 BSC
3.025 0.075
7°
0.04 REF
0.010
0.45 0.15
0.055 0.045
2.75 0.25
All dimensions in millimeters.
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
© 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.
Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold
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830 E. Arques Avenue, Sunnyvale, CA 94085
Phone (408) 737-4600
Fax (408) 737-4611
14
3239.2006.03.1.2
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