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AS1364-BTDT-45 Datasheet(PDF) 10 Page - ams AG

Part # AS1364-BTDT-45
Description  1A, Low-Dropout Linear Voltage Regulator
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS1364-BTDT-45 Datasheet(HTML) 10 Page - ams AG

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Revision 1.05
10 - 15
AS1364
Datasheet - D e t a i l e d D e s c r i p t i o n
Output Voltage Selection
At the factory trimmed versions of the AS1364 offering the bypass pin (see Figure 1 on page 1), the output voltage is
then set to an internally trimmed voltage (see Ordering Information on page 14).
For the adjustable AS1364-AD, an output voltage between +1.2V and +5V can be set by using two external resistors
(see Figure 17). In this mode, VOUT is determined by:
Where:
VSET/BYP = +1.20V.
A simplification of R1 and R2 selection is:
Since the input bias current at SET is less than 100nA, large resistance values can be used for R1 and R2 to minimize
power consumption and therefore increasing efficiency.
Note: Up to 125k
Ω is acceptable for R2. If the SET pin is connected to GND without a resistor, 3.3V will be set as out-
put voltage.
In preset voltage mode, the impedance from SET to GND should be less than 10k
Ω or spurious conditions may cause
the voltage at SET to exceed the 50mV threshold.
Figure 17. Adjustable Output Voltage Typical Application
Shutdown
If pin EN is connected to GND the AS1364 is disabled. In shutdown mode all internal circuits are turned off, reducing
supply current to 10nA (typ). For normal device operation pin EN must be connected to IN. During shutdown, POK
goes low.
Power-OK
The AS1364 features a power-ok indicator that asserts when the output voltage falls out of regulation. The open-drain
POK output goes low when output voltage at OUT falls 6% below its nominal value. A 100k
Ω pull-up resistor from POK
to a (typically OUT) provides a logic control signal.
POK can be used as a power-on-reset (POR) signal to a microcontroller or can drive an external LED to indicate a
power failure condition.
Note: POK is low during shutdown.
(EQ 1)
V
OUT
V
SETBYP
1
R
1
R
2
------
+
⎝⎠
⎛⎞
×
=
(EQ 2)
R
1
R
2
V
OUT
V
SETBYP
---------------------
1
⎝⎠
⎛⎞
×
=
AS1364
COUT
4.7µF
3
IN
5
OUT
2
EN
7
SET/BYP
CIN
4.7µF
Reset Output
On
Off
4
IN
1
POK
6
OUT
VOUT
VIN
R1
R2
8
GND


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