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PDF AAT3218IGV-3.5-T1 Data sheet ( Hoja de datos )
| Número de pieza | AAT3218IGV-3.5-T1 | |
| Descripción | 150mA MicroPower High Performance LDO | |
| Fabricantes | ETC | |
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AAT3218
150mA MicroPower™ High Performance LDO
General Description
The AAT3218 MicroPower™ Low Dropout Linear
Regulator is ideally suited for portable applications
where very fast transient response, extended battery
life and small size are critical. The AAT3218 has
been specifically designed for high speed turn on and
turn off performance, fast transient response, good
power supply ripple rejection (PSRR) and is reason-
ably low noise, making it ideal for powering sensitive
circuits with fast switching requirements.
Other features include low quiescent current, typical-
ly 70µA, and low dropout voltage which is typically
less than 200mV at the maximum output current level
of 150mA. The device is output short circuit protect-
ed and has a thermal shutdown circuit for additional
protection under extreme operating conditions.
The AAT3218 also features a low-power shutdown
mode for extended battery life. A reference bypass
pin has been provided to improve PSRR perform-
ance and output noise, by connecting a small
external capacitor from the AAT3218's reference
output to ground.
The AAT3218 is available in a space saving 5-pin
SOT23 or 8-pin SC70JW package in 16 factory
programmed voltages of 1.2V, 1.4V, 1.5V, 1.8V,
1.9V, 2.0V, 2.3V, 2.5V, 2.6V, 2.7V, 2.8V, 2.85V,
2.9V, 3.0V, 3.3V or 3.5V.
Features
PowerLinear™
• Low Dropout - 200mV at 150mA
• Guaranteed 150mA Output
• High accuracy ±1.5%
• 70µA Quiescent Current
• Fast line and load transient response
• High speed device turn-on and shutdown
• High Power Supply Ripple Rejection
• Low self noise
• Short circuit protection
• Over-Temperature protection
• Uses Low ESR ceramic capacitors
• Output noise reduction bypass capacitor
• Shutdown mode for longer battery life
• Low temperature coefficient
• 16 Factory programmed output voltages
• SOT23 5-pin or SC70JW 8-pin package
Applications
• Cellular Phones
• Notebook Computers
• Portable Communication Devices
• Personal Portable Electronics
• Digital Cameras
Typical Application
VIN
IN OUT
AAT3218
VOUT
ON/OFF
EN
BYP
GND
1µF
10nF
2.2µF
GND
GND
3218.2004.02.1.0
1
1 page  
AAT3218
150mA MicroPower™ High Performance LDO
Typical Characteristics
(Unless otherwise noted, VIN = 5V, TA = 25°C)
Dropout Voltage vs. Temperature
260
240
220
200
IL = 150mA
180
160
140
IL = 100mA
120
100
80
60
40 IL = 50mA
20
0
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120
Temperature (°C)
Dropout Characteristics
3.20
3.00
IOUT = 0mA
2.80
2.60 IOUT = 10mA
IOUT = 50mA
2.40 IOUT = 100mA
2.20 IOUT = 150mA
2.00
2.70 2.80 2.90 3.00 3.10
VIN (V)
3.20
Dropout Voltage vs. Output Current
300
250
200
150
100
50
0
0
85°C
-40°C
25°C
25 50 75 100 125 150
Output Current (mA)
Quiescent Current vs. Temperature
100
90
80
70
60
50
40
30
20
10
0
-40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90 100 110 120
Temperature (°C)
3218.2004.02.1.0
Ground Current vs. Input Voltage
90.00
80.00
70.00
60.00
50.00
40.00
30.00
IOUT=0mA
IOUT=150mA
IOUT=50mA
20.00
10.00
IOUT=10mA
0.00
2
2.5 3
3.5
VIN (V)
4
4.5
Output Voltage vs. Temperature
1.203
1.202
1.201
1.200
1.199
1.198
1.197
1.196
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100
Temperature (°C)
5
5 Page 
AAT3218
150mA MicroPower™ High Performance LDO
Applications Information
In applications where there is a possibility of VOUT
exceeding VIN for brief amounts of time during nor-
mal operation, the use of a larger value CIN capaci-
tor is highly recommended. A larger value of CIN
with respect to COUT will effect a slower CIN decay
rate during shutdown, thus preventing VOUT from
exceeding VIN. In applications where there is a
greater danger of VOUT exceeding VIN for extended
periods of time, it is recommended to place a schot-
tky diode across VIN to VOUT (connecting the cath-
ode to VIN and anode to VOUT). The Schottky diode
forward voltage should be less than 0.45 volts.
Thermal Considerations and High
Output Current Applications
The AAT3218 is designed to deliver a continuous
output load current of 150mA under normal operat-
ing conditions.
The limiting characteristic for the maximum output
load current safe operating area is essentially
package power dissipation and the internal preset
thermal limit of the device. In order to obtain high
operating currents, careful device layout and circuit
operating conditions need to be taken into account.
The following discussions will assume the LDO reg-
ulator is mounted on a printed circuit board utilizing
the minimum recommended footprint as stated in
the layout considerations section of the document.
At any given ambient temperature (TA) the maxi-
mum package power dissipation can be deter-
mined by the following equation:
PD(MAX) = [TJ(MAX) - TA] / ΘJA
Constants for the AAT3218 are TJ(MAX), the maxi-
mum junction temperature for the device which is
125°C and ΘJA = 190°C/W, the package thermal
resistance. Typically, maximum conditions are cal-
culated at the maximum operating temperature
where TA = 85°C, under normal ambient conditions
TA = 25°C. Given TA = 85°, the maximum package
power dissipation is 211mW. At TA = 25°C°, the
maximum package power dissipation is 526mW.
The maximum continuous output current for the
AAT3218 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°,
IOUT(MAX) < 264mA. If the output load current were to
exceed 264mA or if the ambient temperature were to
increase, the internal die temperature will increase.
If the condition remained constant, the LDO regula-
tor thermal protection circuit will activate.
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 AAT3218 set for
a 2.5 volt output:
From the discussion above, PD(MAX) was deter-
mined to equal 526mW at TA = 25°C.
VOUT = 2.5 volts
IOUT = 150mA
IGND = 150µA
VIN(MAX)=(526mW+(2.5Vx150mA))/(150mA +150µA)
VIN(MAX) = 6.00V
Thus, the AAT3218 can sustain a constant 2.5V
output at a 150mA load current as long as VIN is ≤
6.00V at an ambient temperature of 25°C. 6.0V is
the absolute maximum voltage where an AAT3218
would never be operated, thus at 25°C, the device
would not have any thermal concerns or opera-
tional VIN(MAX) limits.
This situation can be different at 85°C. The follow-
ing is an example for an AAT3218 set for a 2.5 volt
output at 85°C:
From the discussion above, PD(MAX) was deter-
mined to equal 211mW at TA = 85°C.
3218.2004.02.1.0
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AAT3218IGV-3.5-T1.PDF ] | |
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