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PDF AAT3220 Data sheet ( Hoja de datos )
| Número de pieza | AAT3220 | |
| Descripción | 150mA NanoPower LDO Linear Regulator | |
| Fabricantes | Advanced Analogic Technologies | |
| Logotipo |  |
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AAT3220
150mA NanoPower™ LDO Linear Regulator
General Description
Features
PowerLinear™
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.
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.
The AAT3221/2 is a similar product for this appli-
cation, especially when a shutdown mode is
required for further power savings.
• 1.1 µA Quiescent Current
• Low Dropout: 200 mV (typ)
• Guaranteed 150mA Output
• High accuracy: ±2.0%
• 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
Applications
• Cellular Phones
• Notebook Computers
• Portable Communication Devices
• Handheld Electronics
• Remote Controls
• Digital Cameras
• PDAs
Typical Application
INPUT
IN OUT
AAT3220
GND
OUTPUT
GND
GND
3220.2001.09.1.0
1
1 page  
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
3 .0 3
3 .0 2
3 .0 1
3
2 .9 9
2 .9 8
2 .9 7
0
80”C
30”C
25”C
20 40 60 80 100
Output (mA)
Output Voltage v. Input Voltage
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 v. 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 v. Output Current
400
300
80”C
200
-30”C
25”C
100
0
0 25 50 75 100 125 150
Output (mA)
Supply Current v. Input Voltage
2.0
1.6
25”C
80”C
1.2
0.8
-30”C
0.4
0
0 12 3 45
Input ( V)
6
3220.2001.09.1.0
PSRR with 10mA Load
60
40
20
0
1.E+01
1.E+0 2
1.E+0 3
1.E+04
Frequency ( Hz )
1.E+0 5
5
5 Page 
AAT3220
150mA NanoPower™ LDO Linear Regulator
For example, if VIN = 5V, VOUT = 3V and TA = 25°,
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.
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.
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 AAT3220 set for
a 3.0 volt output:
From the discussion above, PD(MAX) was deter-
mined to equal 417mW at TA = 25°C.
VOUT = 3.0 volts
IOUT = 150mA
IGND = 1.1µA
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.
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:
From the discussion above, PD(MAX) was deter-
mined to equal 200mW at TA = 85°C.
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.
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:
PD(MAX) is assumed to be 200mW
IGND = 1.1µA
IOUT = 150mA
VIN = 5.0 volts
VOUT = 3.0 volts
%DC = 100(PD(MAX / ((VIN - VOUT)IOUT + (VIN x IGND))
%DC=100(200mW/((5.0V-3.0V)150mA+(5.0Vx1.1µA))
%DC = 66.67%
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 66.67%.
The following family of curves shows the safe oper-
ating area for duty cycled operation from ambient
room temperature to the maximum operating level.
3220.2001.09.1.0
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AAT3220.PDF ] | |
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