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PDF AAT3223IGU Data sheet ( Hoja de datos )
| Número de pieza | AAT3223IGU | |
| Descripción | 250mA NanoPower LDO Linear Regulator with Power -OK | |
| Fabricantes | Advanced Analogic Technologies | |
| Logotipo |  |
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AAT3223
250mA NanoPower™ LDO
Linear Regulator with Power-OK
General Description
The AAT3223 PowerLinear NanoPower low
dropout (LDO) linear regulator is ideal for portable
applications where extended battery life is critical.
This device features extremely low quiescent cur-
rent which is typically 1.1µA. Dropout voltage is
also very low, typically 190mV at 100mA. The
AAT3223 has an enable pin feature which, when
pulled low, will put the LDO regulator into shutdown
mode, removing power from its load and offering
extended power conservation capabilities for
portable battery-powered applications. The
AAT3223 also has a Power-OK (POK) feature.
The POK function monitors the LDO output voltage
and will alert the system if the output falls out of
regulation.
The AAT3223 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-cur-
rent events.
The AAT3223 is available in a space-saving 6-pin
SOT23 package and is rated over the -40°C to
+85°C temperature range.
The AAT3223 is similar to the AAT3221 with the
exception that it offers the additional Power-OK
function through the POK pin.
Features
PowerLinear™
• 1.1µA Quiescent Current
• 250mA Output Current
• Low Dropout: 190mV (typical)
• High Accuracy: ±2%
• Current Limit Protection
• Over-Temperature Protection
• Extremely Low Power Shutdown Mode
• Low Temperature Coefficient
• Stable Operation With Virtually Any Output
Capacitor Type
• Power-OK Signal Output
• Active High Enable Pin
• 4kV ESD
• Factory-Programmed Output Voltages
• 6-pin SOT23 Package
Applications
• Cellular Phones
• Digital Cameras
• Handheld Electronics
• Notebook Computers
• PDAs
• Portable Communication Devices
• Remote Controls
Typical Application
VIN
IN OUT
VOUT
1µF
ON/OFF
AAT3223
EN POK
GND
100k
1µF
POK
GND
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3223.2005.04.1.4
GND
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AAT3223
250mA NanoPower™ LDO
Linear Regulator with Power-OK
Typical Characteristics
Unless otherwise noted, VIN = VOUT + 1V, TA = 25°C, CIN = COUT = 1µF ceramic.
Output Voltage vs. Output Current
Output Voltage vs. 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
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
40 0
300
80°C
200 25°C
-30°C
100
0
0 25 50 75 100 125 150
Output Current (mA)
Supply Current vs. Input Voltage
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
12
80°C
25°C
-30°C
34
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5
6
3223.2005.04.1.4
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
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Ceramic Capacitor Materials: Ceramic capaci-
tors less than 0.1µF are typically made from NPO
or C0G materials. NPO and C0G materials are
typically tight tolerance and are very stable over
temperature. Larger capacitor values are typically
composed of X7R, X5R, Z5U, and Y5V dielectric
materials. Large ceramic capacitors, typically
greater than 2.2µF, are often available in the low-
cost Y5V and Z5U dielectrics. These two material
types are not recommended for use with LDO reg-
ulators since the capacitor tolerance can vary more
than ±50% over the operating temperature range of
the device. A 2.2µF Y5V capacitor could be
reduced to 1µF over the full operating temperature
range. This can cause problems for circuit opera-
tion and stability. X7R and X5R dielectrics are
much more desirable. The temperature tolerance
of X7R dielectric is better than ±15%.
Capacitor area is another contributor to ESR.
Capacitors that are physically large in size will have
a lower ESR when compared to a smaller sized
capacitor of equivalent material and capacitance
value. These larger devices can also improve cir-
cuit transient response when compared to an equal
value capacitor in a smaller package size.
Consult capacitor vendor data sheets carefully when
selecting capacitors for use with LDO regulators.
Enable Function
The AAT3223 features an LDO regulator enable /
disable function. This pin (EN) is compatible with
CMOS logic. For a logic high signal, the EN control
level must be greater than 2.0 volts. A logic low
signal is asserted when the voltage on the EN pin
falls below 0.5 volts. For example, the active high
version AAT3223 will turn on when a logic high is
applied to the EN pin. If the enable function is not
needed in a specific application, it may be tied to
the respective voltage level to keep the LDO regu-
lator in a continuously on state; e.g., the active high
version AAT3223 will tie VIN to EN to remain on.
Power-OK Function
The Power-OK (POK) function is a very useful
basic active low error flag. When the AAT3223
output voltage level is within regulation limits, the
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3223.2005.04.1.4
AAT3223
250mA NanoPower™ LDO
Linear Regulator with Power-OK
resistor (100kΩ is a good resistor value for this pur-
pose). An internal comparator has a reference
threshold set to trigger at 10% of the nominal
AAT3223 output voltage. If the output voltage level
drops below this preset threshold, the POK func-
tion will become active and turn on an open-drain
N-channel MOSFET to pull the POK output pin to
ground. There is a fixed 1ms delay circuit between
the POK comparator output and the N-channel
MOSFET gate. The purpose of the delay is to pre-
vent a false triggering of the POK output during
device turn-on or during very short duration load
transient events. If necessary, additional POK flag
delay can be added by placing a capacitor in paral-
lel with the POK pull-up resistor. The additional
delay time will be set by the RC time constant, the
pull-up resistor, and parallel capacitor values.
When the AAT3223 is in the shutdown state with
the EN pin low, the POK pin becomes low imped-
ance. The LDO output will be discharged through
the high value POK pull-up resistor. When entering
the shutdown state, there is no delay associated
with the POK output; the open-drain device turns
on immediately.
This offers the added advantage of having a hard
application turn-off when the LDO regulator is
turned off. This additional function has no adverse
effect on regulator turn-on time.
Short-Circuit and Thermal Protection
The AAT3223 is protected by both current limit and
over-temperature protection circuitry. The internal
short-circuit current limit is designed to activate
when the output load demand exceeds the maxi-
mum rated output. If a short-circuit condition were
to continually draw more than the current limit
threshold, the LDO regulator's output voltage will
drop to a level necessary to supply the current
demanded by the load. Under short-circuit or other
over-current operating conditions, the output volt-
age will drop and the AAT3223's die temperature
will rapidly increase. Once the regulator's power
dissipation capacity has been exceeded and the
internal die temperature reaches approximately
140°C, the system thermal protection circuit will
become active. The internal thermal protection cir-
cuit will actively turn off the LDO regulator output
pass device to prevent the possibility of over-tem-
perature damage. The LDO regulator output will
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