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PDF AAT3200 Data sheet ( Hoja de datos )
| Número de pieza | AAT3200 | |
| Descripción | LDO Linear Regulator | |
| Fabricantes | AAT | |
| Logotipo |  |
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AAT3200
OmniPower™ LDO Linear Regulator
General Description
Features
PowerLinear™
The AAT3200 PowerLinear OmniPower low
dropout (LDO) linear regulator is ideal for systems
where a low-cost solution is required. This device
features extremely low quiescent current, typically
20µA. Dropout voltage is also very low, typically
200mV. The AAT3200 has output short-circuit and
over-current protection. In addition, the device has
an over-temperature protection circuit which will
shut down the LDO regulator during extended
over-current events.
The AAT3200 is available in a space-saving, Pb-
free SC59 or SOT-89 package (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, the AAT3200 is a truly cost-effective volt-
age conversion solution.
• 250mA Output for SOT-89 Package
• 150mA Output for SC59 Package
• 20µA Quiescent Current
• Low Dropout: 200mV (typical)
• 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 SC59 Packages
Applications
The AAT3201 is a similar product for this applica-
tion, especially when a shutdown mode is required
for further power savings.
• CD-ROM Drives
• Consumer Electronics
www.DataSheet4U.com
Typical Application
INPUT
IN OUT
AAT3200
GND
GND
3200.2006.02.1.4
OUTPUT
GND
1
1 page  
AAT3200
OmniPower™ LDO Linear Regulator
Typical Characteristics
Unless otherwise noted, VIN = VOUT + 1V, TA = 25°C; output capacitor is 1µF ceramic, IOUT = 40mA.
Output Voltage vs. Output Current
Output Voltage vs. Input Voltage
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
Output Current (mA)
100
3 .1
3
2 .9
2 .8
2.7
2 .6
2.5
2.7
1mA
40mA
10mA
2.9 3.1 3.3
Input Voltage (V)
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 Voltage (V)
5.5
Dropout Voltage vs. Output Current
400
300
80°C
200
-30°C
25°C
100
0
0 25 50 75 100 125 150
Output Current (mA)
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
3200.2006.02.1.4
AAT3200 Noise Spectrum
30
20
10
0
-10
-20
-30
1.E+0 1
1.E+0 2
1.E+03
1.E+0 4
Frequency (Hz)
1.E+0 5
1.E+0 6
5
5 Page 
AAT3200
OmniPower™ LDO Linear Regulator
At any given ambient temperature (TA), the maxi-
mum package power dissipation can be deter-
mined by the following equation:
PD(MAX)
=
TJ(MAX) -
θJA
TA
Constants for the AAT3200 are TJ(MAX), the maxi-
mum junction temperature for the device (125°C)
and ΘJA = 200°C/W, the SC59 thermal resistance.
Typically, maximum conditions are calculated at the
maximum operating temperature where TA = 85°C,
under normal ambient conditions TA = 25°C. Given
TA = 85°C, the maximum package power dissipa-
tion is 200mW. At TA = 25°C, the maximum pack-
age power dissipation is 500mW.
The maximum continuous output current for the
AAT3200 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 = 3V, and TA = 25°C,
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 determine the maximum input voltage for a
given load current, refer to the following equation.
This calculation accounts for the total power dissi-
pation of the LDO regulator, including that caused
by ground current.
PD(MAX) = (VIN - VOUT)IOUT + (VIN × IGND)
This formula can be solved for VIN to determine the
maximum input voltage.
VIN(MAX)
=
PD(MAX) + (VOUT × IOUT)
IOUT + IGND
The following is an example for an AAT3200 set for
a 3.0V output:
From the discussion above, PD(MAX) was deter-
mined to equal 417mW at TA = 25°C.
VOUT = 3.0V
IOUT = 150mA
IGND = 20µA
VIN(MAX)
=
500mW + (3.0V × 150mA)
150mA + 20µA
VIN(MAX) > 5.5V
Thus, the AAT3200 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
AAT3200, 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 AAT3200 set for a 3.0V
output at 85°C:
From the discussion above, PD(MAX) was deter-
mined to equal 200mW at TA = 85°C.
VOUT = 3.0V
IOUT = 150mA
IGND = 20µA
VIN(MAX)
=
200mW + (3.0V × 150mA)
150mA + 20µA
VIN(MAX) = 4.33V
3200.2006.02.1.4
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AAT3200.PDF ] | |
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