AAT3220 [AAT]
150mA NanoPower™ LDO Linear Regulator; 150毫安纳安级™ LDO线性稳压器
| 型号： | AAT3220 |
| 厂家： | 
ADVANCED ANALOG TECHNOLOGY, INC. |
| 描述： | 150mA NanoPower™ LDO Linear Regulator |
| 文件： | 总16页 (文件大小：186K) |
| 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 (LDO) linear regulator is ideal for portable
applications where extended battery life is critical.
This device features extremely low quiescent cur-
rent, typically 1.1µA. Dropout voltage is also very
low, typically less than 225mV at the maximum out-
put current of 150mA. The AAT3220 has output
short-circuit and over-current protection. In addi-
tion, the device also has an over-temperature pro-
tection circuit which will shut down the LDO regu-
lator during extended over-current events.
•
•
•
•
•
1.1µA Quiescent Current
Low Dropout: 200mV (typ)
Guaranteed 150mA Output
High Accuracy: ±2.0%
Current Limit and 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 or SC59 Package
4kV ESD Rating
The AAT3220 is available in a Pb-free, space-saving
SC59 package, or a Pb-free SOT-89 package for
applications requiring increased power dissipation.
The device is rated over the -40°C to +85°C tem-
perature 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 volt-
age conversion solution.
Applications
•
•
•
•
•
•
•
Cellular Phones
Digital Cameras
Handheld Electronics
Notebook Computers
PDAs
Portable Communication Devices
Remote Controls
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
3220.2006.01.1.4
1
AAT3220
150mA NanoPower™ LDO Linear Regulator
Pin Descriptions
Pin #
Symbol
Function
SC59
SOT-89
1
3
1
2
GND
IN
Ground connection.
Input. Should be decoupled with 1µF or greater
capacitor.
2
3
OUT
Output. Should be decoupled with 1µF or greater
output capacitor.
Pin Configuration
SC59
SOT-89
(Top View)
(Top View)
3
1
2
OUT
GND
OUT
3
2
IN
IN
1
GND
2
3220.2006.01.1.4
AAT3220
150mA NanoPower™ LDO Linear Regulator
Absolute Maximum Ratings1
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 Rating2 — HBM
TLEAD
VESD
4000
Thermal Information3
Symbol
Description
Rating
Units
SC59
SOT-89
SC59
200
50
ΘJA
Maximum Thermal Resistance
°C/W
500
2
mW
W
PD
Maximum Power Dissipation
SOT-89
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. Human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin.
3. Mounted on a demo board.
4. To calculate minimum input voltage, use the following equation: VIN(MIN) = VOUT(MAX) + VDO(MAX) as long as VIN ≥ 2.5V.
3220.2006.01.1.4
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
0.7
0.6
0.5
0.5
230
220
210
200
190
190
190
190
180
180
50
IQ
VIN = 5V, No Load
VIN = 4.0 to 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
1.18
1.15
1.00
1.00
275
265
255
240
235
230
228
225
220
220
V
OUT = 2.7
%
∆VOUT/VOUT
Load Regulation
IL = 1 to 100mA
VOUT = 2.8
VOUT = 2.85
VOUT = 2.9
VOUT = 3.0
VOUT = 3.3
VOUT = 3.5
VOUT = 2.3
VOUT = 2.4
VOUT = 2.5
VOUT = 2.7
VOUT = 2.8
mV
VDO
Dropout Voltage1, 2
IOUT = 100mA
VOUT = 2.85
VOUT = 2.9
VOUT = 3.0
VOUT = 3.3
VOUT = 3.5
PSRR
TSD
Power Supply Rejection Ratio
Over-Temperature Shutdown
Threshold
100Hz
dB
°C
140
Over-Temperature Shutdown
Hysteresis
THYS
eN
20
350
80
°C
µV
Output Noise
10Hz through 10kHz
Output Voltage Temperature
Coefficient
TC
ppm/°C
1. VDO is defined as VIN - VOUT when VOUT is 98% of nominal.
2. For VOUT < 2.3V, VDO = 2.5V - VOUT
.
4
3220.2006.01.1.4
AAT3220
150mA NanoPower™ LDO Linear Regulator
Typical Characteristics
VIN = VOUT + 1V, TA = 25°C, output capacitor is 1µF ceramic, IOUT = 40mA, unless otherwise noted.
Output Voltage vs. Output Current
Output Voltage vs. 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
0
20
40
60
80
100
5.5
6
2.7
2.9
3.1
3.3
3.5
Output Current (mA)
Input Voltage (V)
Output Voltage vs. Input Voltage
Dropout Voltage vs. 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
0
25
50
75
100
125
150
Input Voltage (V)
Output Current (mA)
Supply Current vs. 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
1.E+01
1.E+02
1.E+03
1.E+04
1.E+05
Input Voltage (V)
Frequency (Hz)
3220.2006.01.1.4
5
AAT3220
150mA NanoPower™ LDO Linear Regulator
Typical Characteristics
VIN = VOUT + 1V, TA = 25°C, output capacitor is 1µF ceramic, IOUT = 40mA, unless otherwise noted.
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+01
1.E+02
1.E+03
1.E+04
1.E+05
1.E+06
-200
0
200
400
600
800
Frequency (Hz)
Time (µs)
Line Response with 10mA Load
Line Response with 100mA 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 (1mA / 40mA)
Load Transient (1mA / 80mA)
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
3220.2006.01.1.4
AAT3220
150mA NanoPower™ LDO Linear Regulator
Typical Characteristics
VIN = VOUT + 1V, TA = 25°C, output capacitor is 1µF ceramic, IOUT = 40mA, unless otherwise noted.
Power-Up with 10mA Load
Power-Up with 1mA Load
4
3
2
1
0
5
4
4
3
2
5
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)
3220.2006.01.1.4
7
AAT3220
150mA NanoPower™ LDO Linear Regulator
Functional Block Diagram
IN
OUT
Over-Current
Protection
Over-Temp
Protection
VREF
GND
The LDO regulator output has been specifically
optimized to function with low cost, low equivalent
series resistance (ESR) ceramic capacitors.
However, the design will allow for operation with a
wide range of capacitor types.
Functional Description
The AAT3220 is intended for LDO regulator appli-
cations where output current load requirements
range from no load to 150mA.
The AAT3220 has complete short-circuit and ther-
mal protection. The integral combination of these
two internal protection circuits give the AAT3220 a
comprehensive safety system to guard against
extreme adverse operating conditions. Device
power dissipation is limited to the package type
and thermal dissipation properties. Refer to the
Thermal Considerations section of this datasheet
for details on device operation at maximum output
load levels.
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 reg-
ulator especially well suited for circuit applications
which are sensitive to load circuit power consump-
tion and extended battery life.
8
3220.2006.01.1.4
AAT3220
150mA NanoPower™ LDO Linear Regulator
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.
Applications Information
To assure the maximum possible performance is
obtained from the AAT3220, please refer to the fol-
lowing application recommendations.
The total output capacitance required can be cal-
culated using the following formula:
Input Capacitor
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 one or two centimeters 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.
∆I
∆V
COUT
=
× 15µF
Where:
∆I = maximum step in output current
∆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 capac-
itors 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.
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 as direct as
practically possible for maximum device perform-
ance. The AAT3220 has been specifically designed
to function with very low ESR ceramic capacitors.
Although the device is intended to operate 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 electrolytic
capacitors. However, for best performance, ceram-
ic capacitors are recommended.
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 incorrectly connected.
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
The value of COUT typically ranges from 0.47µF to
10µF; however, 1µF is sufficient for most operating
conditions.
3220.2006.01.1.4
9
AAT3220
150mA NanoPower™ LDO Linear Regulator
resistance, internal connections, capacitor size and
rent demanded by the load. Under short-circuit or
other over-current operating conditions, the output
voltage would drop and the AAT3220's die temper-
ature would increase rapidly. Once the regulator's
power dissipation capacity has been exceeded and
the internal die temperature reaches approximate-
ly 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.
area, material composition, and ambient tempera-
ture. Typically, capacitor ESR is measured in mil-
liohms for ceramic capacitors and can range to
more than several ohms for tantalum or aluminum
electrolytic capacitors.
Ceramic Capacitor Materials: Ceramic capacitors
less than 0.1µF are typically made from NPO or
C0G materials. NPO and C0G materials generally
have tight tolerance and are very stable over tem-
perature. Larger capacitor values are usually com-
posed of X7R, X5R, Z5U, or Y5V dielectric materi-
als. Large ceramic capacitors (i.e., greater than
2.2µF) are often available in low-cost Y5V and Z5U
dielectrics. These two material types are not rec-
ommended for use with LDO regulators since the
capacitor tolerance can vary by 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 problems for circuit operation and
stability. X7R and X5R dielectrics are much more
desirable. The temperature tolerance of X7R
dielectric is better than ±15%.
The combination and interaction between the short-
circuit and thermal protection systems allows the
LDO regulator to withstand indefinite short-circuit
conditions without sustaining permanent damage.
No-Load Stability
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 section of this datasheet for rec-
ommended typical output capacitor values.
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.
Thermal Considerations and High
Output Current Applications
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 datasheets carefully when
selecting capacitors for use with LDO regulators.
Short-Circuit 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
would drop to a level necessary to supply the cur-
10
3220.2006.01.1.4
AAT3220
150mA NanoPower™ LDO Linear Regulator
At any given ambient temperature (TA), the maxi-
mum package power dissipation can be deter-
mined by the following equation:
PD(MAX) = (VIN - VOUT)IOUT + (VIN × IGND
)
This formula can be solved for VIN to determine the
maximum input voltage.
TJ(MAX) - TA
θJA
PD(MAX)
=
PD(MAX) + (VOUT × IOUT
)
VIN(MAX)
=
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.
IOUT + IGND
The following is an example for an AAT3220 set for
a 3.0V output:
VOUT
IOUT
IGND
= 3.0V
= 150mA
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:
= 1.1µA
500mW + (3.0V × 150mA)
150mA + 1.1µA
VIN(MAX)
=
VIN(MAX) = > 5.5V
PD(MAX)
VIN - VOUT
IOUT(MAX)
<
From the discussion above, PD(MAX) was deter-
mined to equal 417mW at TA = 25°C.
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 example, if VIN = 5V, VOUT = 3V and TA = 25°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 inter-
nal die temperature would increase. If the condition
remained constant and the short-circuit protection
did not activate, there would be a potential damage
hazard to the LDO regulator since the thermal pro-
tection circuit will only activate after a short-circuit
event occurs on the LDO regulator output.
This situation can be different at 85°C. The follow-
ing is an example for an AAT3220 set for a 3.0V
output at 85°C:
VOUT
IOUT
IGND
= 3.0V
To determine the maximum input voltage for a
given load current, refer to the following equation.
This calculation accounts for the total power dissi-
pation of the LDO regulator, including that caused
by ground current.
= 150mA
= 1.1µA
200mW + (3.0V × 150mA)
150mA + 1.1µA
VIN(MAX)
=
VIN(MAX) = 4.33V
3220.2006.01.1.4
11
AAT3220
150mA NanoPower™ LDO Linear Regulator
From the discussion above, PD(MAX) was deter-
mined to equal 200mW at TA = 85°C.
Device Duty Cycle vs. VDROP
(VOUT = 2.5V @ 25°C)
3.5
3
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.
2.5
2
200mA
150mA
1.5
1
0.5
0
0
10
20
30
40
50
60
70
80
90
100
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:
Duty Cycle (%)
Device Duty Cycle vs. VDROP
(VOUT = 2.5V @ 50°C)
3.5
3
IGND = 1.1µA
IOUT = 150mA
VIN = 5.0V
VOUT = 3.0V
2.5
2
200mA
150mA
1.5
1
0.5
0
0
10
20
30
40
50
60
70
80
90
100
PD(MAX)
(VIN - VOUT)IOUT + (VIN × IGND
Duty Cycle (%)
%DC = 100
)
200mW
(5.0V - 3.0V)150mA + (5.0V × 1.1µA)
%DC = 100
%DC = 66.67%
Device Duty Cycle vs. VDROP
(VOUT = 2.5V @ 85°C)
PD(MAX) is assumed to be 200mW
3.5
3
100mA
For a 150mA output current and a 2.0V drop across
the AAT3220 at an ambient temperature of 85°C,
the maximum on-time duty cycle for the device
would be 66.67%.
2.5
2
1.5
1
200mA
150mA
0.5
0
The following family of curves shows the safe oper-
ating area for duty-cycled operation from ambient
room temperature to the maximum operating level.
0
10
20
30
40
50
60
70
80
90
100
Duty Cycle (%)
12
3220.2006.01.1.4
AAT3220
150mA NanoPower™ LDO Linear Regulator
PD(MAX) = (VIN - VOUT)IOUT + (VIN x IGND
PD(150mA) = (4.2V - 3.0V)150mA + (4.2V x 1.1µA)
PD(150mA) = 180mW
)
High Peak Output Current Applications
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, first calculate the power dissi-
pation at the nominal continuous level, then factor
in the addition power dissipation due to the short
duration, high-current peaks.
PD(8.2%D/C) = %DC x PD(150mA)
PD(8.2%D/C) = 0.082 x 180mW
PD(8.2%D/C) = 14.8mW
The power dissipation for a 150mA load occurring
for 8.2% 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.
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.
PD(total) = PD(100mA) + PD(150mA)
PD(total) = 110.2mW + 14.8mW
PD(total) = 125.0mW
First, the current duty cycle percentage must be
calculated:
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
within the thermal limits for safe operation of the
device.
% Peak Duty Cycle: X/100 = 378µs/4.61ms
% Peak Duty Cycle = 8.2%
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 dissipation over time.
Printed Circuit Board Layout
Recommendations
In order to obtain the maximum performance from
the AAT3220 LDO regulator, very careful attention
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(MAX) = (VIN - VOUT)IOUT + (VIN x IGND
PD(100mA) = (4.2V - 3.0V)100mA + (4.2V x 1.1µA)
PD(100mA) = 120mW
)
PD(91.8%D/C) = %DC x PD(100mA)
PD(91.8%D/C) = 0.918 x 120mW
PD(91.8%D/C) = 110.2mW
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.
The power dissipation for 100mA load occurring for
91.8% of the duty cycle will be 110.2mW. Now the
power dissipation for the remaining 8.2% of the
duty cycle at the 150mA load can be calculated:
3220.2006.01.1.4
13
AAT3220
150mA NanoPower™ LDO Linear Regulator
Ordering Information
Output Voltage
Package
Marking1
Part Number (Tape and Reel)2
1.8V
2.0V
2.3V
2.4V
2.5V
2.7V
2.8V
2.85V
2.9V
3.0V
3.1V
3.3V
3.5V
1.8V
2.0V
2.3V
2.4V
2.5V
2.7V
2.8V
2.85V
2.9V
3.0V
3.3V
3.5V
SC59
SC59
BAXYY
EZXYY
AYXYY
AXXYY
ADXYY
AEXYY
AFXYY
FZXYY
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-2.9-T1
AAT3220IGY-3.0-T1
AAT3220IGY-3.1-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-2.9-T1
AAT3220IQY-3.0-T1
AAT3220IQY-3.3-T1
AAT3220IQY-3.5-T1
SC59
SC59
SC59
SC59
SC59
SC59
SC59
SC59
AIXYY
IZXYY
SC59
SC59
AJXYY
IJXYY
SC59
SOT-89
SOT-89
SOT-89
SOT-89
SOT-89
SOT-89
SOT-89
SOT-89
SOT-89
SOT-89
SOT-89
SOT-89
322018
322020
322023
322024
320025
320027
320028
322285
322030
322033
322035
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 all part numbers listed in BOLD.
14
3220.2006.01.1.4
AAT3220
150mA NanoPower™ LDO Linear Regulator
Package Information
SC59
2.85 0.15
0.95 BSC
1.90 BSC
0.45 0.15
0.40 0.10 × 3
SOT-89
4.50 0.10
1.615 0.215
3.00 BSC
MATTED FINISH
1.00 0.20
0.42 0.06
0.42 0.06
POLISH
0.48 0.08
Dimensions shown in millimeters.
3220.2006.01.1.4
15
AAT3220
150mA NanoPower™ LDO Linear Regulator
© 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.
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trol 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
16
3220.2006.01.1.4
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