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PDF AAT3221 Data sheet ( Hoja de datos )
| Número de pieza | AAT3221 | |
| Descripción | 150mA NanoPower LDO Linear Regulator | |
| Fabricantes | Advanced Analogic Technologies | |
| Logotipo |  |
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AAT3221/2
150mA NanoPower™ LDO Linear Regulator
General Description
Features
PowerLinear™
The AAT3221 and AAT3222 PowerLinear™
NanoPower Low Dropout Linear Regulators are
ideal for portable applications where extended bat-
tery life is critical. This device features extremely
low quiescent current which is typically 1.1µA.
Dropout voltage is also very low, typically less than
200mV at the maximum output current of 150mA.
The AAT3221/2 has an Enable pin feature, which
when asserted will enter the LDO regulator into a
shutdown mode removing power from its load and
offering extended power conservation capabilities
for portable battery powered applications.
The AAT3221/2 has output short circuit and over
current protection. In addition, the device also has
an over temperature protection circuit, which will
shutdown the LDO regulator during extended over-
current events. It is available with active high or
active low enable input.
The AAT3221 and AAT3222 are available in space
saving 5-pin SOT23 packages. The AAT3221 is
also available in the 8-pin SC70JW package. The
device is rated over a -40°C to 85°C temperature
range. Since only a small, 1µF ceramic output
capacitor is recommended, often the only space
used is that occupied by the AAT3221/2 itself. The
AAT3221/2 is truly a compact and cost effective volt-
age conversion solution.
The AAT3221/2 is similar to the AAT3220 with the
exception that it offers further power savings with
its enable pin.
• 1.1 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
• Active high or low Enable pin
• 5-pin SOT23 or 8-pin SC70JW packages
• 4kV ESD
Applications
• Cellular Phones
• Notebook Computers
• Portable Communication Devices
• Handheld Electronics
• Remote Controls
• Digital Cameras
• PDAs
Typical Application
INPUT
CIN
1µF
GND
ENABLE
(ENABLE)
IN OUT
AAT3221/2
EN
(EN)
GND
OUTPUT
COUT
1µF
GND
3221.2002.03.0.94
1
1 page  
AAT3221/2
150mA NanoPower LDO Linear Regulator
Typical Characteristics
(Unless otherwise noted, VIN = VOUT + 1V, TA = 25 C, COUT = 5.6 F ceramic, IOUT = 100mA)
Output Voltage vs. Output Current
Output Voltage v. Input Voltage
3.03
3.02
3.01
3
2.99
2.98
2.9 7
0
80°C
25°C
-30°C
20 40 60 80 100
Output (mA)
3.1
3
2.9
2.8
2.7
2.6
2.5
2.7
1mA
40mA
10mA
2.9 3.1
Input (V)
3 .3
3.5
Output Voltage vs. Input Voltage
3.03
1mA
3.02
10mA
3.01
40mA
3
2.99
3 .5
4 4.5 5
Input ( V )
5.5
Drop-out Voltage vs. Output Current
40 0
300
80°C
200 25°C
-30°C
100
0
0 25 50 75 100 125 150
Output (mA)
Supply Current vs. Input Voltage
5
4 25°C
80°C
3
2
-30°C
1
0
0123 456
Input ( V )
3221.2002.03.0.94
PSRR with 10mA Load
60
40
20
0
1.E+01
1.E+02
1.E+03
1.E+04
Frequency (Hz)
1.E+05
5
5 Page 
AAT3221/2
150mA NanoPower™ LDO Linear Regulator
TA = 25°C. Given TA = 85°, the maximum package
power dissipation is 267mW. At TA = 25°C°, the
maximum package power dissipation is 667mW.
The maximum continuous output current for the
AAT3221/2 is a function of the package power dis-
sipation and the input to output voltage drop across
the LDO regulator. Refer to the following simple
equation:
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.
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.
PD(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 AAT3221/2 set
for a 2.5 volt output:
From the discussion above, PD(MAX) was deter-
mined to equal 667mW at TA = 25°C.
VOUT = 2.5 volts
IOUT = 150mA
IGND = 1.1µA
VIN(MAX)=(667mW+(2.5Vx150mA))/(150mA +1.1µA)
VIN(MAX) = 6.95V
Thus, the AAT3221/2 can sustain a constant 2.5V
output at a 150mA load current as long as VIN is ≤
6.95V at an ambient temperature of 25°C. 5.5V is
the maximum input operating voltage for the
AAT3221/2, thus at 25°C, the device would not have
any thermal concerns or operational VIN(MAX) limits.
This situation can be different at 85°C. The follow-
ing is an example for an AAT3221/2 set for a 2.5
volt output at 85°C:
From the discussion above, PD(MAX) was deter-
mined to equal 267mW at TA = 85°C.
VOUT = 2.5 volts
IOUT = 150mA
IGND = 1.1µA
VIN(MAX)=(267mW+(2.5Vx150mA))/(150mA +1.1µA)
VIN(MAX) = 4.28V
Higher input to output voltage differentials can be
obtained with the AAT3221/2, 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 = 5.0V
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:
PD(MAX) is assumed to be 267mW
IGND = 1.1µA
IOUT = 150mA
VIN = 5.0 volts
VOUT = 2.5 volts
%DC = 100(PD(MAX) / ((VIN - VOUT)IOUT + (VIN x IGND))
%DC=100(267mW/((5.0V-2.5V)150mA+(5.0Vx1.1µA))
%DC = 71.2%
For a 150mA output current and a 2.5 volt drop
across the AAT3221/2 at an ambient temperature
of 85°C, the maximum on time duty cycle for the
device would be 71.2%.
The following family of curves shows the safe oper-
ating area for duty cycled operation from ambient
room temperature to the maximum operating level.
3221.2002.03.0.94
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AAT3221.PDF ] | |
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