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PDF AS1367 Data sheet ( Hoja de datos )
| Número de pieza | AS1367 | |
| Descripción | Adaptive Low Drop-Out Linear Regulator | |
| Fabricantes | austriamicrosystems AG | |
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Datasheet
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AS1367
150mA, Adaptive Low Drop-Out Linear Regulator
1 General Description
The AS1367 is a precise, low noise, high speed, low
dropout regulator with adaptive operation. Features
included are high ripple rejection and low dropout volt-
age, a reference voltage source, an error amplifier and a
current limiter.
The AS1367 provides high speed operation, low power
consumption and high efficiency by automatically
switching between a light load and a heavy load mode
depending upon the output current level.
The EN function enables the output to be turned off,
while the electric charge at the output capacitor is
discharged via the internal auto-discharge resistance,
and as a result the VOUT pin quickly returns to the GND
level.
Furthermore a Bypass Pin is included to reduce noise.
The device features integrate short-circuit and over
current protection. Under-Voltage lockout prevents
erratic operation when the input voltage is slowly
decaying. Thermal Protection shuts down the device
when die temperature reaches 160°C. This is a useful
protection when the device is under sustained short
circuit conditions.
The device is available in a 8-pin TDFN 2x2 package.
2 Key Features
! Low Dropout Voltage: 110mV @ 150mA load
! Operating Input Voltage Range: 2.0V to 5.5V
! Output Voltage Range: 1.2V to 5.0V (50mV steps)
! Max. Output Current: 150mA
! Low Shutdown Current: 100nA
! High PSRR: 60dB @ 10kHz
! Integrated Overtemperature/Overcurrent Protection
! Under-Voltage Lockout Feature
! Chip Enable Input
! Power-OK
! Low Quiescent Current: 10µA
! Low Output Noise: 15µV @ 100kHz Bandwidth
! Operating Temperature Range: -40°C to +85°C
! 8-pin TDFN 2x2 Package
3 Applications
The AS1367 is ideal for cellular phones, cordless
phones, wireless communication equipment, portable
games, cameras, video recorders, portable audio-video
equipment and personal digital assistants.
Figure 1. AS1367 - Typical Application Diagram
Input
2V to 5.5V
CIN
1µF
ON /
OFF
IN OUT
AS1367
IN POK
EN BYP
RPU
100kΩ
Output
1.2V to 5.0V
COUT
3.3µF
CBYP
10nF
GND
SET
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1 page  
AS1367
Datasheet - Electrical Characteristics
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Table 3. Electrical Characteristics (Continued)
Symbol
Parameter
Thermal Protection
TSHDN
Thermal Shutdown
Temperature
ΔTSHDN
Thermal Shutdown
Hysteresis
Conditions
Min Typ Max Unit
160 ºC
20 ºC
1. Dropout voltage = VIN - VOUT when VOUT is 100mV < VOUT for VIN = VOUT(NOM) + 0.5V (applies only to nominal
output voltages ≥ 2.5V).
2. Guaranteed by design.
3. The rise and fall time of the shutdown signal must not exceed 1ms.
4. The delay time is defined as time required to set VOUT to 95% of its final nominal value.
Note: All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or
SQC (Statistical Quality Control) methods.
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AS1367
Datasheet - Application Information
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9 Application Information
Capacitor Selection and Regulator Stability
Ceramic capacitors are highly recommended as they offer distinct advantages over their tantalum and aluminum
electrolytic components. For stable operation with load currents up to the maximum over the entire device temperature
range, use a 3.3µF (min) ceramic output capacitor with an ESR <0.2Ω. Use large output capacitor values (10µF max)
to reduce noise and improve load transient-response, stability and power-supply rejection.
Note: Some ceramic capacitors exhibit large capacitance and ESR variations with variations in temperature. Z5U
and Y5V capacitors may be required to ensure stability at temperatures below TAMB = -10ºC. With X7R or X5R
capacitors, a 3.3µF capacitor should be sufficient at all operating temperatures.
Power Supply Rejection Ratio
The AS1367 are designed to deliver low dropout voltages and low quiescent currents. Power-supply rejection is
typically 60dB at 10kHz. To improve power supply-noise rejection and transient response, increase the values of the
input and output bypass capacitors.
The Electrical Characteristics on page 4 show also the device line- and load-transient responses. For further details
see the Power-Supply Rejection Ratio vs. Frequency graph in the Figure 9 on page 7.
Dropout Voltage
For standard products with output voltage greater than the minimum VIN (1.2V), the minimum input-output voltage
differential (dropout voltage) determines the lowest usable supply voltage. This determines the useful end-of-life
battery voltage in battery-powered systems. The dropout voltage is a function of the P-MOSFET drain-to-source on-
resistance multiplied by the load current, and it is calculated by:
VDROPOUT = VIN – VOUT = RDS(ON) × IOUT
(EQ 3)
Where:
RDS(ON) is the drain-to-source on-resistance.
IOUT is the output current.
Figure 17. Application Diagrams
Input
2V to 5.5V
CIN
1µF
External Voltage Level Detection
(Input Monitoring)
IN OUT
AS1367
IN POK
Output
1.2V to 5.0V
RPU
100kΩ
COUT
3.3µF
ON /
OFF
EN BYP
CBYP
10nF
Internal Voltage Level Detection
(Output Monitoring)
Input
2V to 5.5V
CIN
1µF
ON /
OFF
IN OUT
AS1367
IN POK
EN BYP
Output
1.2V to 5.0V
RPU
100kΩ
COUT
3.3µF
CBYP
10nF
RADJ
GND
SET
GND
SET
270kΩ
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