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PDF AAT3221 Data sheet ( Hoja de datos )
| Número de pieza | AAT3221 | |
| Descripción | 150 mA Nanopower LDO Linear Regulator | |
| Fabricantes | Skyworks | |
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DATA SHEET
AAT3221/AAT3222: 150 mA NanopowerTM LDO Linear
Regulator
Applications
• Cellular phones
• Digital cameras
• Handheld electronics
• Notebook computers
• PDAs
• Portable communication devices
• Remote controls
Features
• Quiescent current: 1.1 µA
• Low dropout: 200 mV (typical)
• Guaranteed output: 150 mA
• High accuracy: ±2%
• 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
• Small, 5-pin SOT23 or 8-pin SC70JW (AAT3221 only) package
(MSL1, 260 °C per JEDEC-J-STD-020)
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.
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.
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.
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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202251B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 17, 2013
1
1 page  
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
VEN(L)
EN Input high voltage
VEN(H)
VIN = 2.7 V to 3.6 V
VIN = 5 V
EN Input leakage
IEN(SINK)
VON = 5.5 V
Power supply rejection ratio
PSRR
@ 100 HZ
Over-temperature shutdown threshold TSD
Over-temperature shutdown hysteresis THYS
Output noise
eN f = 10 Hz to 10 kHz
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.
Min Typical Max Units
0.8 V
2.0
V
2.4
0.01 1 µA
50 dB
140 ºC
20 ºC
350 µVRMS
80 PPM/°C
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202251B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 17, 2013
5
5 Page 
DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR
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.
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.
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.
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
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.
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.
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
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:
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
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.
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:
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.
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.
This formula can be solved for VIN to determine the maximum
input voltage.
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
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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202251B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 17, 2013
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AAT3221.PDF ] | |
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