AAT3221IGV-2.7-T1 [SKYWORKS]
Fixed Positive LDO Regulator, 2.7V, 0.24V Dropout, CMOS, PDSO5, GREEN, SOT-23, 5 PIN;
| 型号： | AAT3221IGV-2.7-T1 |
| 厂家： | 
SKYWORKS SOLUTIONS INC. |
| 描述： | Fixed Positive LDO Regulator, 2.7V, 0.24V Dropout, CMOS, PDSO5, GREEN, SOT-23, 5 PIN 光电二极管 |
| 文件： | 总18页 (文件大小：1087K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DATA SHEET
AAT3221/AAT3222: 150 mA NanopowerTM LDO Linear
Regulator
Applications
Description
The AAT3221 and AAT3222 NanoPower™ Low Drop Out (LDO)
linear regulators are ideal for portable applications where
extended battery life is critical. These devices feature extremely
low quiescent current, typically 1.1 µA. Dropout voltage is also
very low, typically less than 200 mV at the maximum output
current of 150 mA. The AAT3221/3222 have an enable pin which,
when asserted, places the LDO regulator into shutdown mode,
removing power from its load and offering extended power
conservation capabilities for portable battery-powered
applications.
• Cellular phones
• Digital cameras
• Handheld electronics
• Notebook computers
• PDAs
• Portable communication devices
• Remote controls
The AAT3221/3222 have output short-circuit and over-current
protection. In addition, the devices also have an over-temperature
protection circuit that shuts down the LDO regulator during
extended over-current events. Both devices are available with
active high or active low enable input.
Features
• Quiescent current: 1.1 µA
• Low dropout: 200 mV (typical)
• Guaranteed output: 150 mA
• High accuracy: ±2%
The AAT3221 and AAT3222 are available in Pb-free, space-saving
5-pin SOT23 packages. The AAT3221 is also available in a
Pb-free, 8-pin SC70JW package. Since only a small, 1 µF
ceramic output capacitor is recommended, often the only space
used is that occupied by the AAT3221 or AAT3222. The
AAT3221/3222 provide a compact and cost-effective voltage
conversion solution.
• Current limit protection
• Over-temperature protection
• Extremely low power shutdown mode
• Low temperature coefficient
• Factory-programmed output voltages: 1.5 V to 3.5 V
• Stable operation with virtually any output capacitor type
• Active high or low enable pin
Both devices are similar to the AAT3220, with the exception that
they offer further power savings with an enable pin.
A typical application circuit is shown in Figure 1. The pin
configuration is shown in Figures 2, 3, and 4. Signal pin
assignments and functional pin descriptions are provided in
Table 1.
• Small, 5-pin SOT23 or 8-pin SC70JW (AAT3221 only) package
(MSL1, 260 °C per JEDEC-J-STD-020)
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DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR
Figure 1. AAT3221/3222 Typical Application Circuit
Figure 4. AAT3222 Pinout
5-Pin SOT23-5 (Top View)
Figure 3. AAT3221 Pinout
8-Pin SC70JW-8 (Top View)
Figure 2. AAT3221 Pinout
5-Pin SOT23-5 (Top View)
Table 1. AAT3221/3222 Signal Descriptions
Pin #
AAT3221
AAT3222
Name
Description
SOT23-5
SC70JW-8
1
2
2
IN
Input pin.
2
5, 6, 7, 8
1
GND
Ground connection pin.
EN(EN)
Enable input. Logic compatible enable with active high or active low option
available; see Ordering Information and Applications Information for details.
3
4
5
4
3
1
4
3
NC
Not connected.
5
OUT
Output pin; should be decoupled with 1 µF or greater capacitor.
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DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR
Typical performance characteristics of the AAT3221/3222 are
illustrated in Figures 5 through 22.
Electrical and Mechanical Specifications
The absolute maximum ratings of the AAT3221/3222 are provided
in Table 2.
The recommended operating conditions are specified in Table 3,
and electrical specifications are provided in Table 4.
Table 2. AAT3221/3222 Absolute Maximum Ratings (Note 1)
Parameter
Input Voltage, <30 ms, 10% DC (continuous max. = 6.0 V)
EN(EN) to GND Voltage
Symbol
Minimum
–0.3
Typical
Maximum
Units
V
VIN
+7
VEN
–0.3
+6
V
Maximum EN(EN) to Input Voltage
Maximum DC Output Current
VENIN(MAX)
IOUT
0.3
V
PD/(VIN – VO)
mA
ºC
Operating Junction Temperature Range
Thermal Resistance (Note 2)
TJ
–40
+150
θJA
SOT23-5
SC70JW-8
SOT23-5
150
160
667
625
ºC/W
ºC/W
mW
mW
V
Power Dissipation (Note 2)
PD
SC70JW-8
Electrostatic Discharge:
ESD
4000
Human Body Model, Class 3A
Note 1: Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other
parameters set at or below their nominal value. Exceeding any of the limits listed may result in permanent damage to the device.
Note 2: Support IN high voltage pulse up to 7 V lasting 8 µs.
CAUTION: Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) can damage this device. This device
must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body
or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times.
Table 3. AAT3221/3222 Recommended Operating Conditions
Parameter
Input voltage (Note 1)
Ambient temperature range
Symbol
VIN
Minimum
(VOUT + VDO)
–40
Typical
Maximum
5.5
Units
V
TA
+85
°C
Note 1: To calculate minimum input voltage, use the following equation: VIN(MIN) = VOUT(MAX) + VDO(MAX) as long as VIN ≥ 2.5 V.
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DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR
Table 4. AAT3221/3222 Electrical Specifications (1 of 2) (Note 1)
(VIN = VOUT(NOM) + 1 V, IOUT = 1 mA, COUT = 1 µF, TA = 25 °C, Unless Otherwise Noted)
Parameter
DC output voltage tolerance
Output current
Symbol
Test Condition
Min
–2.0
150
Typical
Max
Units
%
VOUT
IOUT
ISC
+2.0
VOUT > 1.2 V
mA
mA
µA
Short-circuit current
Ground current
VOUT < 0.4 V
350
1.1
20
IQ
VIN = 5 V, no load
EN = inactive
2.5
Shutdown current
Line regulation
ISD
nA
∆Vout/Vout Х ∆Vin
VIN = 4.0 V to 5.5 V
0.15
1.3
1.2
1.1
1.0
1.0
0.9
0.8
0.8
0.8
0.8
0.7
0.7
0.7
0.7
0.6
0.6
0.5
0.5
230
220
210
205
200
190
190
190
190
188
180
180
0.4
1.72
1.69
1.67
1.65
1.62
1.58
1.45
1.40
1.35
1.30
1.25
1.20
1.20
1.18
1.15
1.06
1.00
1.00
275
265
255
247
240
235
230
228
225
222
220
220
%/V
VOUT = 1.5
VOUT = 1.6
VOUT = 1.7
VOUT = 1.8
VOUT = 1.9
VOUT = 2.0
VOUT = 2.3
VOUT = 2.4
VOUT = 2.5
VOUT = 2.6
VOUT = 2.7
VOUT = 2.8
VOUT = 2.85
VOUT = 2.9
VOUT = 3.0
VOUT = 3.1
VOUT = 3.3
VOUT = 3.5
VOUT = 2.3
VOUT = 2.4
VOUT = 2.5
VOUT = 2.6
VOUT = 2.7
VOUT = 2.8
VOUT = 2.85
VOUT = 2.9
VOUT = 3.0
VOUT = 3.1
VOUT = 3.3
VOUT = 3.5
Load regulation
∆VOUT/VOUT
IOUT = 1 to 100 mA
%
Dropout voltage (Note 2, 3)
VDO
IOUT = 100 mA
mV
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DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR
Table 4. AAT3221/3222 Electrical Specifications (2 of 2) (Note 1)
(VIN = VOUT(NOM) + 1 V, IOUT = 1 mA, COUT = 1 µF, TA = 25 °C, Unless Otherwise Noted)
Parameter Symbol Test Condition
EN Input low voltage
Min
Typical
Max
Units
VEN(L)
VEN(H)
0.8
V
VIN = 2.7 V to 3.6 V
2.0
2.4
EN Input high voltage
V
VIN = 5 V
EN Input leakage
IEN(SINK)
PSRR
TSD
VON = 5.5 V
@ 100 HZ
0.01
50
1
µA
dB
Power supply rejection ratio
Over-temperature shutdown threshold
Over-temperature shutdown hysteresis
Output noise
140
20
ºC
THYS
eN
ºC
f = 10 Hz to 10 kHz
350
80
µVRMS
PPM/°C
Output voltage temperature coefficient
TC
Note 1: Performance is guaranteed only under the conditions listed in this Table.
Note 2: VDO is defined as VIN - VOUT when VOUT is 98% of nominal.
Note 3: For VOUT < 2.3 V, VDO = 2.5 V – VOUT.
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DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR
Typical Performance Characteristics
(VIN = VOUT + 1 V, TA = 25 °C, COUT = 5.6 µF Ceramic, IOUT = 1 mA, Unless Otherwise Noted)
Figure 6. Output Voltage vs Input Voltage
Figure 5. Output Voltage vs Output Current
Figure 7. Output Voltage vs Input Voltage
Figure 9. Supply Current vs Input Voltage
Figure 8. Dropout Voltage vs Output Current
Figure 10. PSRR with 10 mA Load
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DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR
Typical Performance Characteristics
(VIN = VOUT + 1 V, TA = 25 °C, COUT = 5.6 µF Ceramic, IOUT = 1 mA, Unless Otherwise Noted)
Figure 12. Line Response with 1 mA Load
Figure 11. Noise Spectrum
Figure 14. Line Response with 100 mA Load
Figure 13. Line Response with 10 mA Load
Figure 16. Load Transient – 1 mA/80 mA
Figure 15. Load Transient – 1 mA/40 mA
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DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR
Typical Performance Characteristics
(VIN = VOUT + 1 V, TA = 25 °C, COUT = 5.6 µF Ceramic, IOUT = 1 mA, Unless Otherwise Noted)
Figure 18. Turn-On with 1 mA Load
Figure 20. Turn-On with 10 mA Load
Figure 22. Turn-On with 100 mA Load
Figure 17. Power-Up with 1 mA Load
Figure 19. Power-Up with 10 mA Load
Figure 21. Power-Up with 100 mA Load
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DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR
Figure 23. AAT3221/3222 Functional Block Diagram
thermal dissipation properties. Refer to the Thermal
Considerations and High Output Current Applications section of
this document for details on device operation at maximum output
load levels.
Functional Description
The AAT3221 and AAT3222 are intended for LDO regulator
applications where output current load requirements range from
no load to 150 mA. The advanced circuit design of the
AAT3221/3222 has been optimized for very low quiescent or
ground current consumption, making these devices ideal for use
in power management systems for small battery-operated
devices.
Application Information
To ensure that the maximum possible performance is obtained
from the AAT3221 or AAT3222, please refer to the following
application recommendations.
The typical quiescent current level is just 1.1 µA. Both devices
also contain an enable circuit that has been provided to shut
down the LDO regulator for additional power conservation in
portable products. In the shutdown state, the LDO draws less than
1 µA from the input supply.
Input Capacitor
A 1 µF or larger capacitor is typically recommended for CIN in
most applications. A CIN capacitor is not required for basic LDO
regulator operation. However, if the AAT3221/3222 are physically
located more than one or two centimeters from the input power
source, a CIN capacitor is needed for stable operation. CIN should
be located as closely to the device VIN pin as practically possible.
CIN values greater than 1 µF offer superior input line transient
response and helps to maximize the power supply ripple
rejection.
The LDO also demonstrates excellent Power Supply Ripple
Rejection (PSRR), and load and line transient response
characteristics. The AAT3221/3222 high performance LDO
regulators are especially well suited for circuit applications that
are sensitive to load circuit power consumption and extended
battery life.
The LDO regulator output has been specifically optimized to
function with low-cost, low Equivalent Series Resistance (ESR)
ceramic capacitors. However, the design allows for operation with
a wide range of capacitor types.
Ceramic, tantalum, or aluminum electrolytic capacitors may be
selected for CIN, as there is no specific capacitor ESR
requirement. For 150 mA 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.
The AAT3221/3222 have complete short-circuit and thermal
protection. The integral combination of these two internal
protection circuits gives each device a comprehensive safety
system to guard against extreme adverse operating conditions.
Device power dissipation is limited to the package type and
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DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR
Output Capacitor
Equivalent Series Resistance (ESR)
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.
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 AAT3221/3222 have been specifically designed to function
with very low ESR ceramic capacitors. Although the devices are
intended to operate with these low ESR capacitors, they are
stable over a wide range of capacitor ESRs. Therefore, they can
also work with some higher ESR tantalum or aluminum
electrolytic capacitors. However, for best performance, ceramic
capacitors are recommended.
Ceramic Capacitor Materials
Ceramic capacitors less than 0.1 µF are typically made from NPO
or C0G materials. NPO and C0G materials have a typically tight
tolerance and are very stable over temperature ranges. Larger
capacitor values are typically composed of X7R, X5R, Z5U, and
Y5V dielectric materials. Large ceramic capacitors, typically
greater than 2.2 µF, are often available in low-cost Y5V and Z5U
dielectrics. These two material types are not recommended for
use with LDO regulators since the capacitor tolerance can vary
more than ±50% over the operating temperature range of the
device.
The value of COUT typically ranges from 0.47 µF to 10 µF;
however, 1 µF is sufficient for most operating conditions.
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.
A 2.2 µF, Y5V capacitor could be reduced to 1 µF 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 total output capacitance required can be calculated using the
following formula:
Capacitor area is another contributor to ESR. Capacitors that are
physically large in size have a lower ESR when compared to a
smaller sized capacitor of equivalent material and capacitance
value. These larger devices can also improve circuit transient
response when compared to an equal value capacitor in a smaller
package size.
Where:
∆I = maximum step of output current
∆V = maximum excursion 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
AAT3221 or AAT3222 at room temperature. The increased
capacitor value is recommended if tight output tolerances must
be maintained over extreme operating conditions and maximum
operational temperature excursions. If tantalum or aluminum
electrolytic capacitors are used, the capacitor value should be
increased to compensate for the substantial ESR inherent to these
capacitor types.
Consult capacitor vendor Data Sheets carefully when selecting
capacitors for use with LDO regulators.
Enable Function
The AAT3221/3222 devices feature an LDO regulator
enable/disable function. This pin (EN) is compatible with CMOS
logic. Active high or active low options are available (see Ordering
Information).
Capacitor Characteristics
For a logic high signal, the EN control level must be greater than
2.4 V. A logic low signal is asserted when the voltage on the EN
pin falls below 0.8 V. For example, the active high versions of the
AAT3221 and AAT3222 turns on when a logic high is applied to
the EN pin. If the enable function is not needed in a specific
application, it may be tied to the respective voltage level to keep
the LDO regulator in a continuously “on” state (e.g., the active
high version AAT3221/3222 can tie VIN to EN to remain on).
Ceramic composition capacitors are highly recommended over all
other types of capacitors for use with the AAT3221/3222.
Ceramic capacitors offer many advantages over their tantalum
and aluminum electrolytic counterparts. A ceramic capacitor
typically has a very low ESR, a lower cost, a smaller PCB
footprint, and is non-polarized. Line and load transient 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.
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DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR
Constants for the AAT3221/3222 are TJ(MAX), the maximum
junction temperature for the device, which is 125 °C, and
QJA = 150 °C/W, the package thermal resistance. Typically, the
Short-Circuit Protection and Thermal Protection
The AAT3221/2 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 maximum rated output.
maximum package power is calculated at the maximum operating
temperature where TA = 85 °C, and under normal ambient
conditions TA = 25 °C. Given TA = 85 °C, the maximum package
power dissipation is 267 mW. At TA = 25 °C, the maximum
package power dissipation is 667 mW.
If a short-circuit condition was to continually draw more than the
current limit threshold, the LDO regulator output voltage drops to
a level necessary to supply the current demanded by the load.
Under short-circuit or other over-current operating conditions, the
output voltage drops and the device die temperature rapidly
increases.
The maximum continuous output current for the AAT3221/3222 is
a function of the package power dissipation and the input-to-
output voltage drop across the LDO regulator. Refer to the
following simple equation:
Once the regulator’s power dissipation capacity is exceeded and
the internal die temperature reaches approximately 140 °C, the
system thermal protection circuit becomes active. The internal
thermal protection circuit actively turns off the LDO regulator
output pass device to prevent the possibility of over-temperature
damage. The LDO regulator output remains in a shutdown state
until the internal die temperature falls back below the 140 °C trip
point.
For example, if VIN = 5 V, VOUT = 2.5 V and TA = 25 °C,
IOUT(MAX) < 267 mA. The output short-circuit protection threshold
is set between 150 mA and 300 mA. If the output load current
were to exceed 267 mA or if the ambient temperature were to
increase, the internal 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 protection circuit would only
activate after a short-circuit event occurred on the LDO regulator
output.
The 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
To determine the maximum input voltage for a given load current,
refer to the following equation. This calculation accounts for the
total power dissipation of the LDO regulator, including that caused
by ground current.
The AAT3221 and AAT3222 are designed to maintain output
voltage 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
document for recommended typical output capacitor values.
This formula can be solved for VIN to determine the maximum
input voltage.
Thermal Considerations and High Output Current
Applications
The AAT3221/3222 are designed to deliver a continuous output
load current of 150 mA under normal operating conditions. The
limiting characteristic for the maximum output load safe operating
area is essentially package power dissipation and the internal
preset thermal limit of the device.
The following is an example of the AAT3221 or AAT3222 set for a
2.5 V output:
VOUT = 2.5 V
IOUT = 150 mA
IGND = 1.1 µA
To obtain high operating currents, careful device layout and
circuit operating conditions need to be taken into account. The
following discussion assumes that the LDO regulator is mounted
on a printed circuit board using the minimum recommended
footprint, and the printed circuit board is
From the discussion above, PD(MAX) was determined to equal
667 mW at TA = 25 °C. Therefore, the AAT3221/3222 can sustain
a constant 2.5 V output at a 150 mA load current as long as VIN ≤
6.95 V at an ambient temperature of 25 °C. The maximum input
operating voltage is 5.5 V for the AAT3221/3222. Therefore, at
25 °C, the device would not have any thermal concerns or
operational VIN(MAX) limits.
0.062-inch thick FR4 material with one ounce copper.
At any given ambient temperature (TA), the maximum package
power dissipation can be determined by the following equation:
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DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR
This situation can be different at 85 °C. The following is an
example for an AAT3221/3222 set for a 2.5 V output at 85 °C:
VOUT = 2.5 V
IOUT = 150 mA
IGND = 1.1 µA
Figure 24: Device Duty Cycle vs Voltage Drop
(VOUT = 2.5 V @ 25 °C)
From the discussion above, PD(MAX) was determined to equal
267 mW at TA = 85 °C.
Higher input-to-output voltage differentials can be obtained with
the AAT3221/3222, 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.
For example, an application requires VIN = 5.0 V while
VOUT = 2.5 V at a 150 mA load and TA = 85 °C. VIN is greater than
4.28 V, which is the maximum safe continuous input level for
VOUT = 2.5 V at 150 mA 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:
Figure 25: Device Duty Cycle vs Voltage Drop
(VOUT = 2.5 V @ 50 °C)
IGND = 1.1 µA
IOUT = 150 mA
VIN = 5.0 V
VOUT = 2.5 V
Figure 26: Device Duty Cycle vs Voltage Drop
(VOUT = 2.5 V @ 85 °C)
PD(MAX) is assumed to be 267 mW.
For a 150 mA output current and a 2.5 V drop across the
AAT3221/3222 at an ambient temperature of 85 °C, the
maximum on-time duty cycle for the device is 71.2%.
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, one would first need to calculate the
power dissipation at the nominal continuous level, then factor in
the additional power dissipation due to the short duration, high-
current peaks.
The following family of curves shows the safe operating area for
duty-cycled operation from ambient room temperature to the
maximum operating level.
For example, a 2.5 V system using an AAT3221/2IGV-2.5-T1
operates at a continuous 100 mA load current level and has short
150 mA current peaks. The current peak occurs for
378 µs out of a 4.61 ms period. It will be assumed the input
voltage is 5.0 V.
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DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR
First, the current duty cycle percentage must be calculated:
The maximum power dissipation for the AAT3221/3222 operating
at an ambient temperature of 85 °C is 267 mW. The device in this
example has a total power dissipation of 260.25 mW. This is
within the thermal limits for safe operation of the device.
% Peak duty cycle: x/100 = 378 µs/4.61 ms
% Peak duty cycle = 8.2%
The LDO regulator is under the 100 mA load for 91.8% of the
4.61 ms period and have 150 mA peaks occurring for 8.2% of the
time. Next, the continuous nominal power dissipation for the
100 mA load should be determined then multiplied by the duty
cycle to conclude the actual power dissipation over time.
Printed Circuit Board Layout Recommendations
To obtain the maximum performance from the AAT3221/3222
LDO regulator, very careful attention must be considered in
regard to the printed circuit board layout. If grounding
connections are not properly made, power supply ripple rejection
and LDO regulator transient response can be compromised.
PD(MAX) = (VIN – VOUT) IOUT + (VIN × IGND)
PD(100mA) = (5.0 V – 2.5 V) Х 100 mA + (5.0 V × 1.1 μA)
PD(100mA) = 250 mW
The LDO regulator external capacitors CIN and COUT should be
connected as directly as possible to the ground pin of the LDO
regulator. For maximum performance with the AAT3221/3222,
the ground pin connection should then be made directly back to
the ground or common of the source power supply. 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.
PD(91.8%D/C) = %DC · PD(100mA)
PD(91.8%D/C) = 0.918 × 250 mW
PD(91.8%D/C) = 229.5 mW
The power dissipation for a 100 mA load occurring for 91.8% of
the duty cycle is 229.5 mW. Now, the power dissipation for the
remaining 8.2% of the duty cycle at the 150 mA load can be
calculated:
PD(MAX) = (VIN – VOUT) IOUT + (VIN × IGND)
PD(150MA) = (5.0 V – 2.5 V) × 150 mA + (5.0 V × 1.1 μA)
PD(150mA) = 375 mW
Evaluation Board Description
The AAT3221 Evaluation Board schematic diagrams are provided
in Figures 27 and 28. The PCB layout is illustrated in Figures 29
and 30. Component values for the AAT3221 Evaluation Boards are
listed in Tables 5 and 6.
PD(8.2%D/C) = %DC × PD(150mA)
PD(8.2%D/C) = 0.082 × 375 mW
PD(8.2%D/C) = 30.75 mW
The power dissipation for a 150 mA load occurring for 8.2% of the
duty cycle will be 30.75 mW. Finally, the two power dissipation
levels can be summed to determine the total true power
dissipation under the varied load:
Package Information
Package dimensions are shown in Figures 31 (SOT23-5) and 33
(SC70JW-8), and tape and reel dimensions are provided in
Figures 32 (SOT23-5) and 34 (SC70JW-8).
PD(total) = PD(100 mA) + PD(150 mA)
PD(total) = 229.5 mW + 30.75 mW
PD(total) = 260.25 mW
Figure 27: AAT3221 (SOT23-5) Evaluation Board Schematic
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DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR
Figure 28: AAT3221 (SC70JW-8) Evaluation Board Schematic
Figure 29: AAT3221 (SOT23-5) Evaluation Board
Figure 30: AAT3221 (SC70JW-8) Evaluation Board
Table 5. AAT3221 (SOT23-5) Evaluation Board Bill of Materials (BOM)
Component
U1
Part Number
AAT3221IGV-XX-T1
Description
150 mA, NanoPower low dropout linear regulator
Resistor, 100 kΩ, 1/10W, 1%, 0603 SMD
Cap Ceramic, 1µF, 1206 X7R, 25V, 10%
Manufacturer
Skyworks
Yageo
R1
RC0603FR-07100KL
GRM31MR71E105K
C1, C2
Murata
Table 6. AAT3221 (SC70JW-8) Evaluation Board Bill of Materials (BOM)
Component
U1
Part Number
AAT3221IJS-XX-T1
Description
150 mA, NanoPower low dropout linear regulator
Resistor, 100 kΩ, 1/10W, 1%, 0603 SMD
Cap Ceramic, 1µF, 1206 X7R, 25V, 10%
Manufacturer
Skyworks
Yageo
R1,R2
RC0603FR-07100KL
GRM31MR71E105K
C1,C2
Murata
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DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR
Figure 31. AAT3221/3222 5-Pin SOT23-5 Package Dimensions
Figure 32. AAT3221/3222 Tape and Reel Dimensions (SOT23-5)
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DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR
Figure 33. AAT3221 8-Pin SC70JW-8 Package Dimensions
Figure 34. AAT3221/3222 Tape and Reel Dimensions (SC70JW-8)
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DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR
Ordering Information
Output Voltage
Enable
Package
Marking (Note 1)
GYXYY
Part Number (Tape and Reel) (Note 2)
AAT3221IGV-1.6-T1
AAT3221IGV-1.7-T1
AAT3221IGV-1.8-T1
AAT3221IGV-1.9-T1
AAT3221IGV-2.0-T1
AAT3221IGV-2.3-T1
AAT3221IGV-2.4-T1
AAT3221IGV-2.5-T1
AAT3221IGV-2.6-T1
AAT3221IGV-2.7-T1
AAT3221IGV-2.8-T1
AAT3221IGV-2.85-T1
AAT3221IGV-2.9-T1
AAT3221IGV-3.0-T1
AAT3221IGV-3.1-T1
AAT3221IGV-3.3-T1
AAT3221IJS-1.5-T1
AAT3221IJS-1.6-T1
AAT3221IJS-1.7-T1
AAT3221IJS-1.8-T1
AAT3221IJS-1.9-T1
AAT3221IJS-2.0-T1
AAT3221IJS-2.3-T1
AAT3221IJS-2.4-T1
AAT3221IJS-2.5-T1
AAT3221IJS-2.6-T1
AAT3221IJS-2.7-T1
AAT3221IJS-2.8-T1
AAT3221IJS-2.85-T1
AAT3221IJS-2.9-T1
AAT3221IJS-3.0-T1
AAT3221IJS-3.1-T1
AAT3221IJS-3.2-T1
AAT3221IJS-3.3-T1
AAT3221IJS-3.5-T1
AAT3222IGV-2.8-T1
AAT3222IGV-2.9-T1
AAT3221IGV-2.8-2 T1
1.6V
1.7V
GBXYY
BBXYY
CGXYY
BLXYY
1.8V
1.9V
2.0V
2.3V
FLXYY
2.4V
FMXYY
AKXYY
2.5V
SOT23-5
2.6V
GPXYY
2.7V
GDXYY
AQXYY
BYXYY
2.8V
2.85V
2.9V
JCXYY
3.0V
ALXYY
3.1V
GVXYY
3.3V
AMXYY
CFXYY
1.5V
1.6V
1.7V
Active high
1.8V
BBXYY
CGXYY
BLXYY
FLXYY
FMXYY
AKXYY
GPXYY
GDXYY
AQXYY
BYXYY
JCXYY
ALXYY
GVXYY
LEXYY
AMXYY
BMXYY
BIXYY
1.9V
2.0V
2.3V
2.4V
2.5V
2.6V
SC70JW-8
2.7V
2.8V
2.85V
2.9V
3.0V
3.1V
3.2V
3.3V
3.5V
2.8V
2.9V
SOT23-5
2.8V
Active low
CXXYY
Note 1: XYY = assembly and date code.
Note 2: Sample stock is generally held on part numbers listed in BOLD.
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DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR
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相关型号：
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