AAT3220 [ANALOGICTECH]
150mA NanoPower⑩ LDO Linear Regulator; 150毫安纳安级™ LDO线性稳压器
| 型号： | AAT3220 |
| 厂家： | 
ADVANCED ANALOGIC TECHNOLOGIES |
| 描述： | 150mA NanoPower⑩ LDO Linear Regulator |
| 文件： | 总16页 (文件大小：429K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AAT3220
150mA NanoPower™ LDO Linear Regulator
™
PowerLinear
General Description
Features
The AAT3220 PowerLinear™ NanoPower Low
Dropout Linear Regulator is ideal for portable appli-
cations where extended battery life is critical. This
device features extremely low quiescent current
which is typically 1.1µA. Dropout voltage is also
very low, typically less than 225mV at the maxi-
mum output current of 150mA. The AAT3220 has
output short circuit and over current protection. In
addition, the device also has an over temperature
protection circuit, which will shutdown the LDO reg-
ulator during extended over current events.
•
•
•
•
•
•
•
•
1.1 µA Quiescent Current
Low Dropout: 200 mV (typ)
Guaranteed 150mA Output
High accuracy: 2.0ꢀ
Current limit protection
Over-Temperature protection
Low Temperature Coefficient
Factory programmed output voltages:
1.8V to 3.5V
Stable operation with virtually any output
capacitor type
•
•
•
3-pin SOT-89 and SOT-23 packages
4kV ESD Rating
The AAT3220 is available in a space saving SOT-23
package or a SOT-89 for applications requiring
increased power dissipation. The device is rated
over a -40°C to 85°C temperature range. Since only
a small, 1µF ceramic output capacitor is required,
often the only space used is that occupied by the
AAT3220 itself. The AAT3220 is truly a compact and
cost effective voltage conversion solution.
Applications
•
•
•
•
•
•
•
Cellular Phones
Notebook Computers
Portable Communication Devices
Handheld Electronics
Remote Controls
Digital Cameras
PDAs
The AAT3221/2 is a similar product for this appli-
cation, especially when a shutdown mode is
required for further power savings.
Typical Application
INPUT
OUTPUT
IN
OUT
AAT3220
GND
GND
GND
3220.2001.09.1.0
1
AAT3220
150mA NanoPower™ LDO Linear Regulator
Pin Descriptions
Pin #
Symbol
Function
SOT23-3
SOT-89
1
3
1
2
GND
VIN
Ground connection
Input - should be decoupled with 1µF or greater
capacitor
2
3
OUT
NC
Output - should be decoupled with 1µF or greater
output capacitor
N/A
N/A
Not connected
Pin Configuration
SOT-23-3
SOT-89
(Top View)
(Top View)
1
GND
3
OUT
3
IN
2
OUT
2
IN
1
GND
2
3220.2001.09.1.0
AAT3220
150mA NanoPower™ LDO Linear Regulator
Absolute Maximum Ratings (TA=25°C unless otherwise noted)
Symbol
Description
Value
Units
VIN
IOUT
TJ
Input Voltage
-0.3 to 6
PD/(VIN-VO)
-40 to 150
300
V
mA
°C
°C
V
DC Output Current
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
ESD Rating1 — HBM
TLEAD
VESD
4000
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.
Note 1: Human body model is a 100pF capacitor discharged through a 1.5kW resistor into each pin.
Thermal Information
Symbol
Description
RatingUnits
Maximum Thermal Resistance (SOT-23-3)2
Maximum Thermal Resistance (SOT-89)2
Maximum Power Dissipation (SOT-23-3)2
Maximum Power Dissipation (SOT-89)2
200
50
°C/W
°C/W
mW
W
ΘJA
500
2
PD
Note 2: Mounted on a demo board.
Recommended Operating Conditions
Symbol
Description
RatingUnits
VIN
T
Input Voltage
(VOUT+0.34) to 5.5
-40 to +85
V
Ambient Temperature Range
°C
3220.2001.09.1.0
3
AAT3220
150mA NanoPower™ LDO Linear Regulator
Electrical Characteristics (VIN=VOUT(NOM)+1V, IOUT=1mA, COUT=1µF, TA=25°C unless otherwise
noted)
Symbol
Description
Conditions
Min
Typ
Max
Units
VOUT
IOUT
DC Output Voltage Tolerance
Output Current
-2.0
150
2.0
ꢀ
mA
mA
µA
VOUT > 1.2V
ISC
Short Circuit Current
Ground Current
VOUT < 0.4V
350
1.1
0.15
1.0
0.9
0.8
0.8
0.8
0.7
0.7
0.7
0.6
0.5
0.5
290
265
230
220
210
200
190
190
190
180
180
50
IQ
VIN = 5V, no load
VIN = 4.0-5.5V
2.5
0.4
∆VOUT/VOUT
Line Regulation
ꢀ/V
VOUT = 1.8
VOUT = 2.0
VOUT = 2.3
VOUT = 2.4
VOUT = 2.5
1.65
1.60
1.45
1.40
1.35
1.25
1.20
1.20
1.15
1.00
1.00
340
315
275
265
255
240
235
230
225
220
220
∆VOUT/VOUT
Load Regulation
IL=1 to 100mA 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
VDO
Dropout Voltage1
IOUT = 100mA VOUT = 2.7
VOUT = 2.8
mV
VOUT = 2.85
VOUT = 3.0
VOUT = 3.3
VOUT = 3.5
PSRR
TSD
THYS
eN
Power Supply Rejection Ratio
Over Temp Shutdown Threshold
Over Temp Shutdown Hysteresis
Output Noise
100 Hz
dB
°C
140
20
°C
10 Hz through 10 kHz
350
80
µV
TC
Output Voltage Temp. Coeff.
ppm/°C
Note 1: VDO is defined as VIN - VOUT when VOUT is 98ꢀ of nominal.
4
3220.2001.09.1.0
AAT3220
150mA NanoPower™ LDO Linear Regulator
Typical Characteristics
(Unless otherwise noted: VIN = VOUT + 1V, TA = 25°C, Output capacitor is 1 µF ceramic, IOUT = 40 mA)
Output Voltage v. 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
40mA
30”C
25”C
80”C
2.99
2.98
2.97
10mA
2.7
2.9
3.1
3.3
3.5
0
20
40
60
80
100
Input (V )
Output (mA)
Output Voltage v. Input Voltage
Drop-out Voltage v. Output Current
3.03
3.02
3.01
3
400
300
200
100
0
1mA
80”C
10mA
40mA
25”C
-30”C
2.99
3.5
4
4.5
5
5.5
0
25
50
75
100
125
150
Input (V)
Output (mA)
Supply Current v. Input Voltage
PSRR with 10mA Load
2.0
60
40
20
0
1.6
25”C
80”C
1.2
0.8
0.4
0
-30”C
0
1
2
3
4
5
6
1.E+0 1
1.E+0 2
1.E+0 3
1.E+0 4
1.E+0 5
Input (V)
Frequency ( Hz )
3220.2001.09.1.0
5
AAT3220
150mA NanoPower™ LDO Linear Regulator
(Unless otherwise noted: VIN = VOUT + 1V, TA = 25°C, Output capacitor is 1 µF ceramic, IOUT = 40 mA)
AAT3220 Noise Spectrum
Line Response with 1mA Load
30
20
3.8
3.6
3.4
3.2
3
6
5
4
3
2
1
0
10
0
-10
-20
-30
2.8
2.6
1.E+0 1
1.E+0 2
1.E+0 3
1.E+0 4
1.E+0 5
1.E+0 6
-200
0
200
400
600
800
Frequency ( Hz )
Time (µs)
Line Response with 100mA Load
Line Response with 10mA Load
3.8
3.6
3.4
3.2
3
6
5
4
3
2
1
0
3.8
3.6
3.4
3.2
3
6
5
4
3
2
1
0
2.8
2.6
2.8
2.6
-200
0
200
400
600
800
-200
0
200
400
600
800
Time (µs)
Time (µs)
Load Transient - 1 mA / 40 mA
Load Transient - 1 mA / 80 mA
4
3
2
320
240
160
80
4
3
2
320
240
160
80
0
0
-1
0
1
2
3
-1
0
1
2
3
Time (ms)
Time (ms)
6
3220.2001.09.1.0
AAT3220
150mA NanoPower™ LDO Linear Regulator
(Unless otherwise noted: VIN = VOUT + 1V, TA = 25°C, Output capacitor is 1 µF ceramic, IOUT = 40 mA)
Power Up with 10mA Load
Power Up with 1mA Load
4
3
2
5
4
3
2
1
0
5
4
4
3
3
2
2
1
1
0
0
1
-1
-2
-3
-1
-2
-3
0
-1
0
1
2
-1
0
1
2
Time (ms)
Time (ms)
Power Up with 100mA Load
4
3
2
5
4
3
2
1
0
1
-1
-2
-3
0
-1
0
1
2
Time (ms)
3220.2001.09.1.0
7
AAT3220
150mA NanoPower™ LDO Linear Regulator
Functional Block Diagram
IN
OUT
Over-Current
Protection
Over-Temp
Protection
VREF
GND
to load circuit power consumption and extended bat-
tery life.
Functional Description
The AAT3220 is intended for LDO regulator appli-
cations where output current load requirements
range from No Load to 150mA.
The LDO regulator output has been specifically
optimized to function with low cost, low ESR
ceramic capacitors. However, the design will allow
for operation with a wide range of capacitor types.
The advanced circuit design of the AAT3220 has
been optimized for minimum quiescent or ground
current consumption making it ideal for use in power
management systems for small battery operated
devices. The typical quiescent current level is just
1.1µA. The LDO also demonstrates excellent power
supply ripple rejection (PSRR) and load and line
transient response characteristics. The AAT3220 is
a truly high performance LDO regulator especially
well suited for circuit applications which are sensitive
The AAT3220 has complete short circuit and thermal
protection. The integral combination of these two
internal protection circuits give the AAT3220 a com-
prehensive safety system to guard against extreme
adverse operating conditions. Device power dissi-
pation is limited to the package type and thermal dis-
sipation properties. Refer to the thermal considera-
tions section for details on device operation at max-
imum output load levels.
8
3220.2001.09.1.0
AAT3220
150mA NanoPower™ 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 AAT3220, please refer to the fol-
lowing application recommendations.
∆I
∆V
COUT
=
× 15µF
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 AAT3220 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
highest possible 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 AAT3220 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 capaci-
tor 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. There is no specific
capacitor ESR requirement for CIN. For 150mA
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.
Capacitor Characteristics
Ceramic composition capacitors are highly recom-
mended over all other types of capacitors for use
with the AAT3220. 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 AAT3220 has been specifically
designed to function with very low ESR ceramic
capacitors. Although the device is intended to oper-
ate with 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 elec-
trolytic capacitors. However, for best performance,
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 or Y5V dielectric materials. Large
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 the output load current expected and the
voltage excursion that the load can tolerate.
3220.2001.09.1.0
9
AAT3220
150mA NanoPower™ LDO Linear Regulator
ceramic capacitors, typically greater than 2.2µF are
No-Load Stability
often available in the low cost Y5V and Z5U dielec-
trics. These two material types are not recommend-
ed for use with LDO regulators since the capacitor
tolerance can vary by more than 50ꢀ 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 15ꢀ.
The AAT3220 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.
Thermal Considerations and High
Output Current Applications
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.
The AAT3220 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 0.062 inch thick FR4 material with
one ounce copper.
Consult capacitor vendor data sheets carefully when
selecting capacitors for use with LDO regulators.
Short Circuit Protection and Thermal
Protection
The AAT3220 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 AAT3220's die temperature
will increase rapidly. Once the regulator's power
dissipation capacity has been exceeded and the
internal die temperature reaches approximately
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.
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] / Θ JA
Constants for the AAT3220 are TJ(MAX), the maxi-
mum junction temperature for the device which is
125°C and ΘJA = 200°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
TA = 25°C. Given TA = 85°C, the maximum pack-
age power dissipation is 200mW. At TA = 25°C°, the
maximum package power dissipation is 500mW.
The maximum continuous output current for the
AAT3220 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:
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.
IOUT(MAX) < PD(MAX) / (VIN - VOUT
)
10
3220.2001.09.1.0
AAT3220
150mA NanoPower™ LDO Linear Regulator
For example, if VIN = 5V, VOUT = 3V and TA = 25°,
From the discussion above, PD(MAX) was deter-
mined to equal 200mW at TA = 85°C.
IOUT(MAX) < 250mA. The output short circuit protec-
tion threshold is set between 150mA and 300mA.
If the output load current were to exceed 250mA or
if the ambient temperature were to increase, the
internal die temperature will increase. If the condi-
tion remained constant and the short circuit protec-
tion were not to activate, there would be a potential
damage hazard to LDO regulator since the thermal
protection circuit will only activate after a short cir-
cuit event occurs on the LDO regulator output.
VOUT = 3.0 volts
IOUT = 150mA
IGND = 1.1µA
VIN(MAX)=(200mW+(3.0Vx150mA))/(150mA+1.1µA)
VIN(MAX) = 4.33V
Higher input to output voltage differentials can be
obtained with the AAT3220, 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
cause by ground current.
For example, an application requires VIN = 5.0V
while VOUT = 3.0V at a 150mA load and TA = 85°C.
VIN is greater than 4.33V, which is the maximum
safe continuous input level for VOUT = 3.0V 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.
VIN(MAX) = (PD(MAX) + (VOUT x IOUT)) / (IOUT + IGND
)
The following is an example for an AAT3220 set for
a 3.0 volt output:
PD(MAX) is assumed to be 200mW
From the discussion above, PD(MAX) was deter-
mined to equal 417mW at TA = 25°C.
IGND = 1.1µA
IOUT = 150mA
VIN = 5.0 volts
VOUT = 3.0 volts
VOUT = 3.0 volts
IOUT = 150mA
IGND = 1.1µA
ꢀDC = 100(PD(MAX / ((VIN - VOUT)IOUT + (VIN x IGND))
ꢀDC=100(200mW/((5.0V-3.0V)150mA+(5.0Vx1.1µA))
ꢀDC = 66.67ꢀ
VIN(MAX)=(500mW+(3.0Vx150mA))/(150mA+1.1µA)
VIN(MAX) > 5.5V
Thus, the AAT3220 can sustain a constant 3.0V
output at a 150mA load current as long as VIN is ≤
5.5V at an ambient temperature of 25°C. 5.5V is
the maximum input operating voltage for the
AAT3220, thus at 25°C, the device would not have
any thermal concerns or operational VIN(MAX) limits.
For a 150mA output current and a 2.0 volt drop
across the AAT3220 at an ambient temperature of
85°C, the maximum on time duty cycle for the
device would be 66.67ꢀ.
The following family of curves shows the safe oper-
ating area for duty cycled operation from ambient
room temperature to the maximum operating level.
This situation can be different at 85°C. The follow-
ing is an example for an AAT3220 set for a 3.0 volt
output at 85°C:
3220.2001.09.1.0
11
AAT3220
150mA NanoPower™ 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-
late the power dissipation at the nominal continu-
3.5
3
2.5
2
200mA
ous level, then factor in the addition power dissi-
pation due to the short duration high current peaks.
150mA
1.5
1
For example, a 3.0V system using a AAT3220IGV-
2.5-T1 operates at a continuous 100mA load cur-
rent level and has short 150mA current peaks. The
current peak occurs for 378µs out of a 4.61ms peri-
od. It will be assumed the input voltage is 5.0V.
0.5
0
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 = 378µs/4.61ms
ꢀ Peak Duty Cycle = 8.2ꢀ
Device Duty Cycle vs. VDROP
VOUT = 2.5V @ 50 degrees C
The LDO Regulator will be under the 100mA load for
91.8ꢀ of the 4.61ms period and have 150mA peaks
occurring for 8.2ꢀ 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 dissipation over time.
3.5
3
2.5
2
200mA
150mA
1.5
1
PD(MAX) = (VIN - VOUT)IOUT + (VIN x IGND
PD(100mA) = (4.2V - 3.0V)100mA + (4.2V x 1.1µA)
PD(100mA) = 120mW
)
0.5
0
0
10
20
30
40
50
60
70
80
90
100
Duty Cycle (%)
PD(91.8ꢀD/C) = ꢀDC x PD(100mA)
PD(91.8ꢀD/C) = 0.918 x 120mW
PD(91.8ꢀD/C) = 110.2mW
The power dissipation for 100mA load occurring for
91.8ꢀ of the duty cycle will be 110.2mW. Now the
power dissipation for the remaining 8.2ꢀ of the
duty cycle at the 150mA load can be calculated:
Device Duty Cycle vs. VDROP
VOUT = 2.5V @ 85 degrees C
3.5
3
PD(MAX) = (VIN - VOUT)IOUT + (VIN x IGND
PD(150mA) = (4.2V - 3.0V)150mA + (4.2V x 1.1µA)
PD(150mA) = 180mW
)
100mA
2.5
2
PD(8.2ꢀD/C) = ꢀDC x PD(150mA)
PD(8.2ꢀD/C) = 0.082 x 180mW
PD(8.2ꢀD/C) = 14.8mW
1.5
1
200mA
150mA
0.5
0
The power dissipation for a 150mA load occurring
for 8.2ꢀ of the duty cycle will be 14.8mW. Finally,
the two power dissipation levels can be summed to
determine the total power dissipation under the
varied load.
0
10
20
30
40
50
60
70
80
90
100
Duty Cycle (%)
12
3220.2001.09.1.0
AAT3220
150mA NanoPower™ LDO Linear Regulator
P
D(total) = PD(100mA) + PD(150mA)
must be paid in regard to the printed circuit board
layout. If grounding connections are not properly
made, power supply ripple rejection and LDO regu-
lator transient response can be compromised.
PD(total) = 110.2mW + 14.8mW
PD(total) = 125.0mW
The maximum power dissipation for the AAT3220
operating at an ambient temperature of 85°C is
200mW. The device in this example will have a
total power dissipation of 125.0mW. This is well
with in the thermal limits for safe operation of the
device.
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 AAT3220, 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.
Printed Circuit Board Layout
Recommendations
In order to obtain the maximum performance from
the AAT3220 LDO regulator, very careful attention
3220.2001.09.1.0
13
AAT3220
150mA NanoPower™ LDO Linear Regulator
Ordering Information
Part Number
Output Voltage
Package
Marking
Bulk
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Tape and Reel
1.8V
2.0V
2.3V
2.4V
2.5V
2.7V
2.8V
2.85V
3.0V
3.3V
3.5V
1.8V
2.0V
2.3V
2.4V
2.5V
2.7V
2.8V
2.85V
3.0V
3.3V
3.5V
SOT-23-3
SOT-23-3
SOT-23-3
SOT-23-3
SOT-23-3
SOT-23-3
SOT-23-3
SOT-23-3
SOT-23-3
SOT-23-3
SOT-23-3
SOT-89
AAT3220IGY-1.8-T1
AAT3220IGY-2.0-T1
AAT3220IGY-2.3-T1
AAT3220IGY-2.4-T1
AAT3220IGY-2.5-T1
AAT3220IGY-2.7-T1
AAT3220IGY-2.8-T1
AAT3220IGY-2.85-T1
AAT3220IGY-3.0-T1
AAT3220IGY-3.3-T1
AAT3220IGY-3.5-T1
AAT3220IQY-1.8-T1
AAT3220IQY-2.0-T1
AAT3220IQY-2.3-T1
AAT3220IQY-2.4-T1
AAT3220IQY-2.5-T1
AAT3220IQY-2.7-T1
AAT3220IQY-2.8-T1
AAT3220IQY-2.85-T1
AAT3220IQY-3.0-T1
AAT3220IQY-3.3-T1
AAT3220IQY-3.5-T1
SOT-89
SOT-89
SOT-89
SOT-89
SOT-89
SOT-89
SOT-89
SOT-89
SOT-89
SOT-89
14
3220.2001.09.1.0
AAT3220
150mA NanoPower™ LDO Linear Regulator
Package Information
SOT-23-3
Millimeters
Min MaxMin
Inches
Max
Dim
D
A
A1
A2
b
C
D
E
e
H
L
1.00
0.00
0.70
0.35
0.10
2.70
1.40
0.00
2.60
0.37
0.45
0.85
1°
1.70
0.10
3.15
0.85
0.35
3.10
1.80
0.00
3.00
0.00
0.55
1.05
9°
0.040
0.067
0.003
0.124
0.033
0.013
0.122
0.070
0.000
0.118
0.000
0.021
0.041
9°
S1
0.000
0.027
0.013
0.003
0.106
0.055
0.000
0.094
0.014
0.017
0.033
1°
E
H
e
S
S
S1
θ1
Note:
A
A2
1. PACKAGE BODY SIZE EXCLUDE MOLD FLASH
PROTRUSIONS OR GATE BURRS.
2. TOLERANCE 0.1000 mm (4mi) UNLESS OTHER-
WISE SPECIFIED
Θ1
C
A1
L
b
3. COPLANARITY: 0.1000
4. DIMENSION L IS MEASURED IN GAGE PLANE
SOT-89
Millimeters
Min MaxMin
Inches
Max
D
POLISH
Dim
D1
A
A1
b
b1
C
1.40
0.80
0.36
0.41
0.38
4.40
1.40
0.00
2.40
2.90
1.60
0.00
0.48
0.53
0.43
4.60
1.75
4.25
2.60
3.10
0.055
0.063
0.000
0.018
0.020
0.017
0.181
0.069
0.167
0.102
0.122
0.031
0.014
0.016
0.014
0.173
0.055
0.000
0.094
0.114
E
H E
D
D1
HE
E
A1
A
e
MATTED FINISH
e
A
b
b
POLISH
b1
3220.2001.09.1.0
15
AAT3220
150mA NanoPower™ LDO Linear Regulator
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Advanced Analogic Technologies, Inc.
1250 Oakmead Parkway, Suite 310, Sunnyvale, CA 94086
Phone (408) 524-9684
Fax (408) 524-9689
16
3220.2001.09.1.0
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