概述
数据手册AAT3201IGV-3.5-T1 概述
150mA OmniPower LDO Linear Regulator 150毫安能量总LDO线性稳压器
AAT3201IGV-3.5-T1 数据手册
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PDF下载AAT3201
150mA OmniPower™ LDO Linear Regulator
™
PowerLinear
General Description
Features
The AAT3201 PowerLinear™ OmniPower Low
Dropout Linear Regulator is ideal for systems
where a low cost solution is critical. This device
features extremely low quiescent current which is
typically 20µA. Dropout voltage is also very low,
typically 200mV. The AAT3201 has an Enable pin
feature, which when pulled low will enter the LDO
regulator into a shutdown mode removing power
from its load and offering extended power conser-
vation capabilities for portable battery powered
applications.
•
•
•
•
•
•
•
•
•
20 µA Quiescent Current
Low Dropout: 200 mV (typical)
Guaranteed 150 mA Output
High accuracy: ±2%
Current limit protection
Over-Temperature protection
Extremely Low power shutdown mode
Low Temperature Coefficient
Factory programmed output voltages
•
1.8V to 3.5V
•
•
Stable operation with virtually any output
capacitor type
The AAT3201 has output short circuit and over cur-
rent protection. In addition, the device also has an
over temperature protection circuit, which will shut-
down the LDO regulator during extended over-cur-
rent events.
5-pin SOT23 package
Applications
•
•
The AAT3201 is available in the space saving 5-pin
SOT23 package. The device is rated over a -40°C
to 85°C temperature range. Since only a small, 1µF
ceramic output capacitor is recommended, the
AAT3201 is a truly cost effective voltage conversion
solution.
Consumer Electronics
Cellular Phones
The AAT3201 is similar to the AAT3200 with the
exception that it offers further power savings with
its enable pin.
Typical Application
INPUT
OUTPUT
ENABLE
CIN
1µF
COUT
1µF
GND
GND
3201.2002.3.0.91
1
AAT3201
150mA OmniPower™ LDO Linear Regulator
Pin Descriptions
Pin #
Symbol
IN
Function
Input pin
1
2
3
GND
EN
Ground connection pin
Enable pin - When pulled low the PMOS pass transistor turns off and all
internal circuitry enters low-power mode, consuming less than 1µA.
4
5
NC
Not Connected
OUT
Output pin - should be decoupled with 1µF or greater capacitor
Pin Configuration
AAT3201
SOT-23-5
(Top View)
1
2
3
5
OUT
NC
IN
GND
EN
4
2
3201.2002.3.0.91
AAT3201
150mA OmniPower™ LDO Linear Regulator
Absolute Maximum Ratings (TA=25°C unless otherwise noted)
Symbol
Description
Input Voltage
EN to GND Voltage
Maximum EN to Input Voltage
Maximum DC Output Current
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
Value
Units
V
V
VIN
VEN
VENIN(MAX)
IOUT
TJ
TLEAD
-0.3 to 6
-0.3 to 6
0.3
PD/(VIN-VO)
-40 to 150
300
V
mA
°C
°C
Note: Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at con-
ditions other than the operating conditions specified is not implied. Only one Absolute Maximum rating should be applied at any one time.
Thermal Information
Symbol
Description
Thermal Resistance (SOT23-5)
Power Dissipation (SOT23-5)
Rating
150
667
Units
°C/W
mW
1
ΘJA
PD
1
Note 1: Mounted on a demo board.
Recommended Operating Conditions
Symbol
Description
Input Voltage
Ambient Temperature Range
Rating
(VOUT+VDO) to 5.5
-40 to +85
Units
V
°C
VIN
T
3201.2002.3.0.91
3
AAT3201
150mA OmniPower™ LDO Linear Regulator
Electrical Characteristics (VIN=VOUT(NOM)+1V, IOUT=1mA, COUT=1µF, TA=25°C unless otherwise noted)
Symbol
VOUT
Description
Conditions
Min
-2.0
150
Typ
Max Units
DC Output Voltage Tolerance
Maximum Output Current
Short Circuit Current
Ground Current
2.0
%
mA
mA
µA
IOUT
ISC
IQ
ISD
VOUT > 1.2 V
VOUT < 0.4 V
VIN = 5 V, no load
EN = inactive
350
20
30
Shutdown Current
1
µA
∆VOUT/VOUT
Line Regulation
VIN = 4.0-5.5 V
0.15
1.0
0.9
0.8
0.8
0.8
0.7
0.7
0.7
0.6
%/V
VOUT = 1.8
1.65
1.60
1.45
1.40
1.35
1.25
1.20
1.20
1.15
1.00
1.00
410
385
345
335
335
310
305
300
295
295
290
0.8
VOUT = 2.0
VOUT = 2.3
VOUT = 2.4
VOUT = 2.5
VOUT = 2.7
VOUT = 2.8
VOUT = 2.85
VOUT = 3.0
VOUT = 3.3
VOUT = 3.5
VOUT = 1.8
VOUT = 2.0
VOUT = 2.3
VOUT = 2.4
VOUT = 2.5
VOUT = 2.7
VOUT = 2.8
VOUT = 2.85
VOUT = 3.0
VOUT = 3.3
VOUT = 3.5
∆VOUT/VOUT
Load Regulation
IL=1 to 100mA
%
0.6
0.5
0.5
290
265
230
220
210
200
190
190
190
180
180
1
VDO
Dropout Voltage
IOUT = 100mA
mV
VEN(L)
VEN(H)
IEN(SINK)
PSRR
TSD
THYS
eN
EN Input Low Voltage
EN Input High Voltage
EN Input leakage
Power Supply Rejection Ratio
Over Temp Shutdown Threshold
Over Temp Shutdown Hysteresis
Output Noise
V
V
µA
dB
°C
VIN = 5 V
VON = 5.5 V
100 Hz
2.4
0.01
50
140
20
350
80
1
°C
µVRMS
PPM/°C
TC
Output Voltage Temp. Coefficient
Note 1: VDO is defined as VIN - VOUT when VOUT is 98% of nominal.
4
3201.2002.3.0.91
AAT3201
150mA OmniPower™ LDO Linear Regulator
Typical Characteristics
(Unless otherwise noted, VIN = VOUT + 1V, TA = 25°C, COUT = 5.6µF ceramic, IOUT = 100mA)
Output Voltage vs. Output Current Output Voltage v. Input Voltage
3.03
3.02
3.01
3
3.1
3
1mA
2.9
2.8
2.7
2.6
2.5
-30ºC
40mA
25ºC
2.99
2.98
2.97
80ºC
10mA
2.7
2.9
3.1
3.3
3.5
0
20
40
60
80
100
Input (V)
Output (mA)
Output Voltage vs. Input Voltage
Drop-out Voltage vs. Output Current
3.03
3.02
3.01
3
400
300
200
100
0
1mA
80ºC
10mA
25ºC
40mA
-30ºC
2.99
3.5
4
4.5
5
5.5
0
25
50
75
100
125
150
Input (V)
Output (mA)
PSRR with 10mA Load
Noise Spectrum
60
40
20
0
30
20
10
0
-10
-20
-30
1.E+01
1.E+02
1.E+03
1.E+04
1.E+05
1.E+01
1.E+02
1.E+03
1.E+04
1.E+05
1.E+06
Frequency (Hz)
Frequency (Hz)
3201.2002.3.0.91
5
AAT3201
150mA OmniPower™ LDO Linear Regulator
(Unless otherwise noted, VIN = VOUT + 1V, TA = 25°C, COUT = 5.6µF ceramic, IOUT = 100mA)
Load Transient - 1 mA / 40 mA
Line Response with 1mA Load
4
3
2
320
240
160
80
3.8
3.6
3.4
3.2
3
6
5
4
3
2
1
0
Input
Output
Output
2.8
2.6
0
-200
0
200
400
600
800
-1
0
1
2
3
Time (µs)
Time (ms)
Load Transient - 1 mA / 80 mA
Line Response with 10mA Load
4
3
2
320
240
160
80
3.8
3.6
3.4
3.2
3
6
5
4
3
2
1
0
Input
Output
Output
2.8
2.6
0
-200
0
200
400
600
800
-1
0
1
2
3
Time (µs)
Time (ms)
Line Response with 100mA Load
3.8
3.6
3.4
3.2
3
6
5
4
3
2
1
0
Input
Output
2.8
2.6
-200
0
200
400
600
800
Time (µs)
6
3201.2002.3.0.91
AAT3201
150mA OmniPower™ LDO Linear Regulator
(Unless otherwise noted, VIN = VOUT + 1V, TA = 25°C, COUT = 5.6µF ceramic, IOUT = 100mA)
Power Up with 1mA Load
Turn On with 1mA Load
4
3
2
1
0
5
4
4
3
2
1
0
3
3
2
2
Enable
Enable
1
1
0
-1
-2
-3
0
Output
Output
-1
-1
0
1
2
-1
0
1
2
Time (ms)
Time (ms)
Power Up with 10mA Load
Turn On with 10mA Load
4
3
2
1
0
5
4
4
3
2
1
0
3
2
3
2
Enable
Enable
1
1
0
-1
-2
-3
0
Output
Output
-1
-1
0
1
2
-1
0
1
2
Time (ms)
Time (ms)
Power Up with 100mA Load
Turn On with 100mA Load
4
3
2
5
4
4
3
3
3
2
2
2
Enable
1
1
Enable
Output
0
1
-1
-2
-3
1
0
Output
0
0
-1
-1
0
1
2
-1
0
1
2
Time (ms)
Time (ms)
3201.2002.3.0.91
7
AAT3201
150mA OmniPower™ LDO Linear Regulator
Functional Block Diagram
IN
OUT
Over-Current
Protection
Over-Temp
Protection
EN
VREF
GND
The LDO regulator output has been specifically
optimized to function with low cost, low ESR
Functional Description
ceramic capacitors. However, the design will allow
for operation with a wide range of capacitor types.
The AAT3201 is intended for LDO regulator appli-
cations where output current load requirements
range from No Load to 150mA. The advanced cir-
cuit design of the AAT3201 has been optimized for
use as the most cost effective solution. The typical
quiescent current level is just 20µA. The AAT3201
also contains an enable circuit, which has been pro-
vided to shutdown the LDO regulator for additional
power conservation in portable products. In the
shutdown state the LDO draws less than 1µA from
input supply.
The AAT3201 has complete short circuit and ther-
mal protection. The integral combination of these
two internal protection circuits give the AAT3201 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 for details on
device operation at maximum output load levels.
The LDO also demonstrates excellent power sup-
ply rejection ratio (PSRR), and load and line tran-
sient response characteristics.
8
3201.2002.3.0.91
AAT3201
150mA OmniPower™ LDO Linear Regulator
The total output capacitance required can be cal-
culated using the following formula:
Applications Information
To assure the maximum possible performance is
obtained from the AAT3201, please refer to the fol-
lowing application recommendations.
∆I
COUT
=
× 15µF
∆V
Where:
Input Capacitor
∆I = maximum step in output current
Typically a 1µF or larger capacitor is recommended
for CIN in most applications. A CIN capacitor is not
required for basic LDO regulator operation.
However, if the AAT3201 is physically located any
distance more than a centimeter or two from the
input power source, a CIN capacitor will be needed
for stable operation. CIN should be located as close
to the device VIN pin as practically possible. CIN val-
ues greater than 1µF will offer superior input line
transient response and will assist in maximizing the
power supply ripple rejection.
∆V = maximum excursion in voltage that the load
can tolerate
Note that use of this equation results in capacitor
values approximately two to four times the typical
value needed for an AAT3201 at room temperature.
The increased capacitor value is recommended if
tight output tolerances must be maintained over
extreme operating conditions and maximum opera-
tional temperature excursions. If tantalum or alu-
minum electrolytic capacitors are used, the capacitor
value should be increased to compensate for the
substantial ESR inherent to these capacitor types.
Ceramic, tantalum or aluminum electrolytic capaci-
tors may be selected for CIN as there is no specific
capacitor ESR requirement. For 150mA LDO reg-
ulator output operation, ceramic capacitors are rec-
ommended for CIN due to their inherent capability
over tantalum capacitors to withstand input current
surges from low impedance sources such as bat-
teries in portable devices.
Capacitor Characteristics
Ceramic composition capacitors are highly recom-
mended over all other types of capacitors for use
with the AAT3201. 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 less prone
to damage if connected incorrectly.
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 per-
formance. The AAT3201 has been specifically
designed to function with very low ESR ceramic
capacitors. Although the device is intended to oper-
ate with these low ESR capacitors, it is stable over
a very wide range of capacitor ESR, thus it will also
work with some higher ESR tantalum or aluminum
electrolytic capacitors. However, for best perform-
ance, ceramic capacitors are recommended.
Equivalent Series Resistance (ESR): ESR is a
very important characteristic to consider when
selecting a capacitor. ESR is the internal series
resistance associated with a capacitor, which
includes lead resistance, internal connections,
capacitor 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.
The value of COUT typically ranges from 0.47µF to
10µF, however 1µF is sufficient for most operating
conditions.
Ceramic Capacitor Materials: Ceramic capacitors
less than 0.1µF are typically made from NPO or
COG materials. NPO and COG materials are typi-
cally tight tolerance and very stable over tempera-
ture. Larger capacitor values are typically composed
of X7R, X5R, Z5U and Y5V dielectric materials.
If large output current steps are required by an
application, then an increased value for COUT
should be considered. The amount of capacitance
needed can be calculated from the step size of the
change in output load current expected and the
voltage excursion that the load can tolerate.
3201.2002.3.0.91
9
AAT3201
150mA OmniPower™ LDO Linear Regulator
Large ceramic capacitors, typically greater than
140°C the system thermal protection circuit will
become active. The internal thermal protection cir-
cuit will actively turn off the LDO regulator output
pass device to prevent the possibility of over tem-
perature damage. The LDO regulator output will
remain in a shutdown state until the internal die
temperature falls back below the 140°C trip point.
2.2µF are often available in the low cost Y5V and Z5U
dielectrics. These two material types are not recom-
mended for use with LDO regulators since the capac-
itor 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 the full
operating temperature range. This can cause prob-
lems for circuit operation and stability. X7R and X5R
dielectrics are much more desirable. The tempera-
ture tolerance of X7R dielectric is better than ±15%.
The interaction between the short circuit and ther-
mal protection systems allow the LDO regulator to
withstand indefinite short circuit conditions without
sustaining permanent damage.
Capacitor area is another contributor to ESR.
Capacitors, which are physically large in size will
have a lower ESR when compared to a smaller
sized capacitor of equivalent material and capaci-
tance value. These larger devices can also improve
circuit transient response when compared to an
equal value capacitor in a smaller package size.
No-Load Stability
The AAT3201 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. An output capacitor is required for stability
under no load operating conditions. Refer to the
output capacitor considerations section for recom-
mended typical output capacitor values.
Consult capacitor vendor data sheets carefully when
selecting capacitors for use with LDO regulators.
Enable Function
Thermal Considerations and High
Output Current Applications
The AAT3201 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 then 2.4 volts. The LDO regulator
will go into the disable shutdown mode when the
voltage on the EN pin falls below 0.6 volts. If the
enable function is not needed in a specific applica-
tion, it may be tied to VIN to keep the LDO regula-
tor in a continuously on state.
The AAT3201 is designed to deliver a continuous
output load current of 150mA under normal operat-
ing conditions. The limiting characteristic for the
maximum output load safe operating area is essen-
tially package power dissipation and the internal pre-
set thermal limit of the device. In order to obtain high
operating currents, careful device layout and circuit
operating conditions need to be taken into account.
The following discussions will assume the LDO reg-
ulator is mounted on a printed circuit board utilizing
the minimum recommended footprint and the print-
ed circuit board is 0.062inch thick FR4 material with
one ounce copper.
Short Circuit Protection and Thermal
Protection
The AAT3201 is protected by both current limit and
over temperature protection circuitry. The internal
short circuit current limit is designed to activate
when the output load demand exceeds the maxi-
mum rated output. If a short circuit condition were
to continually draw more than the current limit
threshold, the LDO regulator's output voltage will
drop to a level necessary to supply the current
demanded by the load. Under short circuit or other
over current operating conditions, the output volt-
age will drop and the AAT3201's die temperature
will increase rapidly. Once the regulator's power
dissipation capacity has been exceeded and the
internal die temperature reaches approximately
At any given ambient temperature (TA) the maxi-
mum package power dissipation can be deter-
mined by the following equation:
PD(MAX) = [TJ(MAX) - TA] / ΘJA
Constants for the AAT3201 are TJ(MAX), the maxi-
mum junction temperature for the device which is
125°C and ΘJA = 150°C/W, the package thermal
resistance. Typically, maximum conditions are cal-
culated at the maximum operating temperature
where TA = 85°C, under normal ambient conditions
10
3201.2002.3.0.91
AAT3201
150mA OmniPower™ LDO Linear Regulator
TA = 25°C. Given TA = 85°, the maximum package
at 25°C, the device would not have any thermal con-
cerns or operational VIN(MAX) limits.
power dissipation is 267mW. At TA = 25°C°, the
maximum package power dissipation is 667mW.
This situation can be different at 85°C. The follow-
ing is an example for an AAT3201 set for a 2.5 volt
output at 85°C:
The maximum continuous output current for the
AAT3201 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:
From the discussion above, PD(MAX) was deter-
mined to equal 267mW at TA = 85°C.
VOUT = 2.5 volts
IOUT = 150mA
IGND = 20µA
IOUT(MAX) < PD(MAX) / (VIN - VOUT
)
For example, if VIN = 5V, VOUT = 2.5V and TA = 25°,
IOUT(MAX) < 267mA. The output short circuit protec-
tion threshold is set between 150mA and 300mA. If
the output load current were to exceed 267mA or if
the ambient temperature were to increase, the inter-
nal die temperature will increase. If the condition
remained constant and the short circuit protection
did not activate, there would be a potential damage
hazard to LDO regulator since the thermal protection
circuit will only activate after a short circuit event
occurs on the LDO regulator output.
VIN(MAX)=(267mW+(2.5Vx150mA))/(150mA+20µA)
VIN(MAX) = 4.28V
Higher input to output voltage differentials can be
obtained with the AAT3201, while maintaining
device functions in the thermal safe operating area.
To accomplish this, the device thermal resistance
must be reduced by increasing the heat sink area
or by operating the LDO regulator in a duty cycled
mode.
To figure what the maximum input voltage would be
for a given load current refer to the following equa-
tion. This calculation accounts for the total power
dissipation of the LDO Regulator, including that
caused by ground current.
For example, an application requires VIN = 5.0V
while VOUT = 2.5V at a 150mA load and TA = 85°C.
VIN is greater than 4.28V, which is the maximum
safe continuous input level for VOUT = 2.5V at
150mA for TA = 85°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 following calculation for duty cycle operation:
P
D(MAX) = (VIN - VOUT)IOUT + (VIN x IGND)
This formula can be solved for VIN to determine
the maximum input voltage.
PD(MAX) is assumed to be 267mW
VIN(MAX) = (PD(MAX) + (VOUT x IOUT)) / (IOUT + IGND
)
IGND = 20µA
IOUT = 150mA
VIN = 5.0 volts
VOUT = 2.5 volts
The following is an example for an AAT3201 set for
a 2.5 volt output:
From the discussion above, PD(MAX) was deter-
mined to equal 667mW at TA = 25°C.
%DC = 100(PD(MAX) / ((VIN - VOUT)IOUT + (VIN x IGND))
%DC=100(267mW/((5.0V-2.5V)150mA+(5.0Vx20µA))
%DC = 71.2%
VOUT = 2.5 volts
IOUT = 150mA
IGND = 20µA
For a 150mA output current and a 2.5 volt drop
across the AAT3201 at an ambient temperature of
85°C, the maximum on time duty cycle for the
device would be 71.2%.
VIN(MAX)=(667mW+(2.5Vx150mA))/(150mA +20µA)
VIN(MAX) = 6.95V
Thus, the AAT3201 can sustain a constant 2.5V out-
put at a 150mA load current as long as VIN is ≤ 6.95V
at an ambient temperature of 25°C. 5.5V is the max-
imum input operating voltage for the AAT3201, thus
The following family of curves shows the safe oper-
ating area for duty cycled operation from ambient
room temperature to the maximum operating level.
3201.2002.3.0.91
11
AAT3201
150mA OmniPower™ LDO Linear Regulator
High Peak Output Current Applications
Device Duty Cycle vs. VDROP
VOUT = 2.5V @ 25 degrees C
Some applications require the LDO regulator to
operate at continuous nominal levels with short
duration high current peaks. The duty cycles for
both output current levels must be taken into
account. To do so, one would first need to calcu-
3.5
3
200mA
2.5
2
late the power dissipation at the nominal continu-
ous level, then factor in the addition power dissipa-
tion due to the short duration high current peaks.
1.5
1
0.5
0
For example, a 2.5V system using a AAT3221/
2IGV-2.5-T1 operates at a continuous 100mA load
current level and has short 150mA current peaks.
The current peak occurs for 378µs out of a 4.61ms
period. It will be assumed the input voltage is 5.0V.
0
10
20
30
40
50
60
70
80
90
100
Duty Cycle (%)
First, the current duty cycle percentage must be
calculated:
% Peak Duty Cycle: X/100 = 378ms/4.61ms
% Peak Duty Cycle = 8.2%
Device Duty Cycle vs. VDROP
VOUT = 2.5V @ 50 degrees C
The LDO Regulator will be under the 100mA load
for 91.8% of the 4.61ms period and have 150mA
peaks occurring for 8.2% of the time. Next, the
continuous nominal power dissipation for the
100mA load should be determined then multiplied
by the duty cycle to conclude the actual power dis-
sipation over time.
3.5
3
200mA
2.5
2
150mA
1.5
1
0.5
0
PD(MAX) = (VIN - VOUT)IOUT + (VIN x IGND
)
0
10
20
30
40
50
60
70
80
90
100
PD(100mA) = (5.0V - 2.5V)100mA + (5.0V x 20µA)
PD(100mA) = 250mW
Duty Cycle (%)
PD(91.8%D/C) = %DC x PD(100mA)
PD(91.8%D/C) = 0.918 x 250mW
PD(91.8%D/C) = 229.5mW
Device Duty Cycle vs. VDROP
VOUT = 2.5V @ 85 degrees C
3.5
3
100mA
2.5
2
200mA
150mA
1.5
1
0.5
0
0
10
20
30
40
50
60
70
80
90
100
Duty Cycle (%)
12
3201.2002.3.0.91
AAT3201
150mA OmniPower™ LDO Linear Regulator
The power dissipation for a 100mA load occurring
Printed Circuit Board Layout
Recommendations
for 91.8% of the duty cycle will be 229.5mW. Now
the power dissipation for the remaining 8.2% of the
duty cycle at the 150mA load can be calculated:
In order to obtain the maximum performance from
the AAT3201 LDO regulator, very careful attention
must be considered in regard to the printed circuit
board layout. If grounding connections are not prop-
erly made, power supply ripple rejection and LDO
regulator transient response can be compromised.
P
D(MAX) = (VIN - VOUT)IOUT + (VIN x IGND)
PD(150mA) = (5.0V - 2.5V)150mA + (5.0V x 20µA)
PD(150mA) = 375mW
PD(8.2%D/C) = %DC x PD(150mA)
PD(8.2%D/C) = 0.082 x 375mW
PD(8.2%D/C) = 30.75mW
The LDO Regulator external capacitors CIN and
COUT should be connected as directly as possible
to the ground pin of the LDO Regulator. For maxi-
mum performance with the AAT3201, the ground
pin connection should then be made directly back
to the ground or common of the source power sup-
ply. If a direct ground return path is not possible
due to printed circuit board layout limitations, the
LDO ground pin should then be connected to the
common ground plane in the application layout.
The power dissipation for a 150mA load occurring
for 8.2% of the duty cycle will be 20.9mW. Finally,
the two power dissipation levels can summed to
determine the total true power dissipation under the
varied load.
P
D(total) = PD(100mA) + PD(150mA)
PD(total) = 229.5mW + 30.75mW
PD(total) = 260.25mW
The maximum power dissipation for the AAT3201
operating at an ambient temperature of 85°C is
267mW. The device in this example will have a total
power dissipation of 260.25mW. This is within the
thermal limits for safe operation of the device.
3201.2002.3.0.91
13
AAT3201
150mA OmniPower™ LDO Linear Regulator
Ordering Information
Output Voltage
1.8V
Package
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
Marking
FDXYY
Part Number (Tape and Reel)
AAT3201IGV-1.8-T1
AAT3201IGV-2.0-T1
AAT3201IGV-2.3-T1
AAT3201IGV-2.4-T1
AAT3201IGV-2.5-T1
AAT3201IGV-2.7-T1
AAT3201IGV-2.8-T1
AAT3201IGV-2.85-T1
AAT3201IGV-3.0-T1
AAT3201IGV-3.3-T1
AAT3201IGV-3.5-T1
2.0V
2.3V
2.4V
2.5V
2.7V
2.8V
2.85V
3.0V
3.3V
FFXYY
DJXYY
DKXYY
DLXYY
DMXYY
FNXYY
3.5V
Note: Sample stock is generally held on all part numbers listed in BOLD.
Note 1: XYY = assembly and date code.
Package Information
SOT23-5
2.85 ± 0.15
1.90 BSC
0.95
BSC
0.60 REF
0.15 ± 0.07
GAUGE PLANE
0.075
± 0.075
0.45 ± 0.15
0.10 BSC
0.60 REF
10°
±
5°
0.40 ± 0.10
All dimensions in millimeters.
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, and advise customers 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 subject to the terms and conditions of sale
supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability.
AnalogicTech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech’s standard warranty. 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.
Advanced Analogic Technologies, Inc.
830 E. Arques Avenue, Sunnyvale, CA 94085
Phone (408) 737-4600
Fax (408) 737-4611
14
3201.2002.3.0.91
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