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PDF AS1363 Data sheet ( Hoja de datos )
| Número de pieza | AS1363 | |
| Descripción | Low-Dropout Linear Voltage Regulator | |
| Fabricantes | austriamicrosystems AG | |
| Logotipo |  |
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AS1363
500mA, Low-Dropout Linear Voltage Regulator
Datasheet
1 General Description
The AS1363 is a low-dropout linear regulator that oper-
ates from a +2.0V to +5.5V supply and delivers a guar-
anteed 500mA load current with low 150mV dropout.
The device is available in two versions (see Table 1).
One version has a high-accuracy output with a preset
voltage (1.2, 1.5, 1.8, 3.0, 3.3, or 4.5V). This voltage is
internally trimmed and also offers a Bypass pin. With a
capacitor connected to this Bypass pin, the PSRR and
the Noise performance is improved.
At the other version the output voltage is user-adjustable
(1.2V to 5.3V) and offers an SET pin for setting the out-
put voltage.
Table 1. Standard Products
Model Output Type
AS1363-AD Adjustable
AS1363-_ _ Fixed
BYP
No
Yes
SET
Yes
No
A low supply current (65µA typ.) at maximum load is
making the device ideal for portable battery-operated
equipment.
Other features are included such as an active-low open-
drain reset output that indicates when the output is out
of regulation, a low-current (30nA typ.) shutdown mode,
an integrated short-circuit and a thermal shutdown pro-
tection.
The AS1363 is available in a 6-pin SOT23 package.
2 Key Features
! Guaranteed Output Current: 500mA
! Low Dropout: 150mV @ 500mA
! 2.0V to 5.5V Input Voltage
! Fixed Output Voltage: 1.2V to 5.0V
! User-Adjustable Output Voltage: 1.2V to 5.3V
! Power OK Output
! Low Quiescent Current: 40µA
! Low Shutdown Current: 30nA
! Thermal Overload Protection
! Output Current Limit
! 6-pin SOT23 Package
3 Applications
The device is ideal for laptops, PDAs, portable audio
devices, mobile phones, cordless phones, and any other
battery-operated portable device.
Figure 1. Typical Application Circuit
VIN
2.0V to 5.5V
1
IN
CIN
1µF
6
OUT
AS1363-AD
On 3
5
Off EN
SET
To Controller
VOUT Logic
Supply Voltage
RPOK
100kΩ
2
POK
4
GND
COUT
2.2µF
R1
VOUT
1.2V to 5.3V
R2
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Revision 1.03
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1 page  
AS1363
Datasheet - Electrical Characteristics
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Table 4. Electrical Characteristics (Continued)
Symbol
POK Output
Parameter
Condition
VOL POK Output Low Voltage
POK sinking 1mA
Operating Voltage Range for
Valid POK Signal
POK sinking 100µA
POK Output High leakage
Current
POK = 5.5V, TAMB = +25ºC
TAMB = +85ºC
POK Threshold
Thermal Protection
Rising edge (referenced to VOUT(NOM))
TSHDNN
Thermal Shutdown
Temperature
ΔTSHDNN Thermal Shutdown Hysteresis
Min Typ Max
0.05 0.25
1.1 5.5
1
5
90 94
98
170
20
Unit
V
V
nA
%
ºC
ºC
1. Guaranteed by production test of load regulation and line regulation.
2. Dropout voltage is defined as VIN - VOUT, when VOUT is 100mV below the value of VOUT measured for VIN =
(VOUT(NOM) + 500mV). Since the minimum input voltage is 2.0V, this specification is only valid when VOUT(NOM)
> 2.0V.
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Revision 1.03
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5 Page 
AS1363
Datasheet - Application Information
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9 Application Information
Capacitor Selection and Regulator Stability
Input and output capacitors are required for stable operation of the AS1363 over the full temperature range and with
load currents up to 500mA. Connect CIN and COUT as close to the AS1363 as possible to minimize the impact of PC
board trace inductance.
For CIN, connect a 1µF capacitor between IN and ground. CIN lowers the source impedance of the input supply.
Reduce noise and improve load-transient response, stability, and power supply rejection by using larger output capac-
itors, such as 10µF.
For COUT connect a 2.2µF low-ESR capacitor between OUT and ground. The output capacitor’s ESR affects stability
and output noise. Use output capacitors with an ESR of 0.1Ω or less to ensure stability and optimum transient
response. Surface-mount ceramic capacitors have very-low ESR and are commonly available in values up to 10µF.
For output voltages less than 2V, use a 4.7µF low-ESR output capacitor for COUT.
Noise, Power Supply Rejection Ratio, and Transient Response
The AS1363 is designed to operate with low dropout voltages and low quiescent currents in battery-powered systems
while still maintaining good noise response, transient response, and AC rejection. See Typical Operating Characteris-
tics on page 6 for a plot of power-supply rejection ratio (PSRR) versus frequency. When operating from noisy sources,
improved supply-noise rejection and transient response can be achieved by increasing the values of the input and out-
put bypass capacitors and through passive filtering techniques.
Dropout Voltage
Because the AS1363 uses a P-channel MOSFET pass transistor, its dropout voltage is a function of drain-to-source
on-resistance (RDS(ON)) multiplied by the load current:
VDROPOUT = VIN – VOUT = RDS(ON) × IOUT
Note: The AS1363 ground current remains below 200µA in dropout.
(EQ 4)
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