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PDF AAT3201 Data sheet ( Hoja de datos )
| Número de pieza | AAT3201 | |
| Descripción | 150mA OmniPower LDO Linear Regulator | |
| Fabricantes | Advanced Analogic Technologies | |
| Logotipo |  |
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AAT3201
150mA OmniPower™ LDO Linear Regulator
General Description
The AAT3201 PowerLinear™ OmniPower Low
Dropout Linear Regulator is ideal for systems
where a low cost solution is critical. This device
features extremely low quiescent current which is
typically 20µA. Dropout voltage is also very low,
typically 200mV. The AAT3201 has an Enable pin
feature, which when pulled low will enter the LDO
regulator into a shutdown mode removing power
from its load and offering extended power conser-
vation capabilities for portable battery powered
applications.
The AAT3201 has output short circuit and over cur-
rent protection. In addition, the device also has an
over temperature protection circuit, which will shut-
down the LDO regulator during extended over-cur-
rent events.
The AAT3201 is available in the space saving 5-pin
SOT23 package. The device is rated over a -40°C
to 85°C temperature range. Since only a small, 1µF
ceramic output capacitor is recommended, the
AAT3201 is a truly cost effective voltage conversion
solution.
The AAT3201 is similar to the AAT3200 with the
exception that it offers further power savings with
its enable pin.
Features
PowerLinear™
• 20 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
• 5-pin SOT23 package
Applications
• Consumer Electronics
• Cellular Phones
Typical Application
INPUT
CIN
1µF
GND
ENABLE
IN OUT
AAT3201
EN
GND
OUTPUT
COUT
1µF
GND
3201.2002.3.0.91
1
1 page  
AAT3201
150mA OmniPower™ LDO Linear Regulator
Typical Characteristics
(Unless otherwise noted, VIN = VOUT + 1V, TA = 25°C, COUT = 5.6µF 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
25ºC
80ºC
-30ºC
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
3.02 1mA
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
80ºC
200 25ºC
-30ºC
100
0
0 25 50 75 100 125 150
Output (mA)
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
3201.2002.3.0.91
Noise Spectrum
30
20
10
0
-10
-20
-30
1.E+01
1.E+02
1.E+03
1.E+04
Freque ncy (Hz)
1.E+05
1.E+06
5
5 Page 
AAT3201
150mA OmniPower™ 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
AAT3201 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:
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 AAT3201 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 = 20µA
VIN(MAX)=(667mW+(2.5Vx150mA))/(150mA +20µA)
VIN(MAX) = 6.95V
Thus, the AAT3201 can sustain a constant 2.5V out-
put at a 150mA load current as long as VIN is ≤ 6.95V
at an ambient temperature of 25°C. 5.5V is the max-
imum input operating voltage for the AAT3201, thus
at 25°C, the device would not have any thermal con-
cerns or operational VIN(MAX) limits.
This situation can be different at 85°C. The follow-
ing is an example for an AAT3201 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 = 20µA
VIN(MAX)=(267mW+(2.5Vx150mA))/(150mA+20µA)
VIN(MAX) = 4.28V
Higher input to output voltage differentials can be
obtained with the AAT3201, 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 = 20µA
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+(5.0Vx20µA))
%DC = 71.2%
For a 150mA output current and a 2.5 volt drop
across the AAT3201 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.
3201.2002.3.0.91
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AAT3201.PDF ] | |
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