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PDF APL5317 Data sheet ( Hoja de datos )
| Número de pieza | APL5317 | |
| Descripción | Selectable Adjustable/Fixed Low Dropout 300mA Linear Regulator | |
| Fabricantes | ANPEC | |
| Logotipo |  |
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APL5317
Selectable Adjustable/Fixed Low Dropout 300mA Linear Regulator
Features
• Wide Operating Voltage: 2.8~6V
• Low Dropout Voltage:
230mV(Typical) @ 300mA
• Guaranteed 300mA Output Current
• Two Modes for Setting Output Voltage
- Fixed Output Voltage: 1~5V
- Adjustable Output Voltage: 0.8~5.5V
• Current-Limit Protection with Foldback Current
• Internal Soft-Start
• Over-Temperature Protection
• Stable with Low ESR Ceramic Capacitor
• SOT-23-5 Package
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• Cellular Phones
• Portable and Battery-Powered Equipment
• Notebook and Personal Computers
Simplified Application Circuit
General Description
The APL5317 is a low dropout linear regulator which only
needs a single input voltage supply from 2.8 to 6V, and it
can deliver current up to 300mA to a set output voltage. It
can work with low ESR ceramic capacitors that make it
ideal for using in the battery-powered applications, such
as notebook computers and cellular phones. Its typical
dropout voltage is only 230mV at 300mA loading. The
APL5317 provides two output voltage operation modes,
the fixed output voltage mode and the adjustable output
voltage, controlled by the SET pin for setting the output
voltage. The fixed output voltage mode sets the output to
a preset voltage (only 1.2V available now) in the chip by
connecting SET pin to the ground, and the adjustable
output voltage mode needs two resistors as a voltage
divider connected to SET pin to define the output. The
current-limit with current foldback and thermal shutdown
functions protect the device against current over-loads
and over temperature. The APL5317 is available in a SOT-
23-5 package.
Pin Configuration
VIN 1
GND 2
SHDN 3
5 VOUT
4 SET
SOT-23-5
1. Fixed Output Voltage Mode
VIN
CIN
APL5317
1
VIN
5
VOUT
3 SHDN
4
SET
GND
2
VOUT
COUT
2. Adjustable Output Voltage Mode
VIN
CIN
APL5317
1
VIN
5
VOUT
3 SHDN
4
SET
GND
2
VOUT
COUT
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Mar., 2009
1
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
1 page  
APL5317
Typical Operating Characteristics (Cont.)
Loop Gain vs. Frequency
50
40 VIN=3.3V, VOUT=1.2V, CIN=1µF, COUT=2.2µF
30 IOUT=100mA
20
10
0
-10
-20 IOUT=300mA
-30
-40
1000
10000
100000
Frequency (Hz)
1000000
Current Limit vs. Junction Temperature
650
VIN=5V
600
Phase vs. Frequency
160
140 VIN=3.3V, VOUT=1.2V, CIN=1µF, COUT=2.2µF
120 IOUT=300mA
100
80
60
40 IOUT=100mA
20
0
1000
10000
100000
Frequency (Hz)
1000000
550
500
450
-50
-25 0 25 50 75
Junction Temperature, TJ ( C)
100 125
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Mar., 2009
5
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
5 Page 
APL5317
Application Information
Input Capacitor
The APL5317 requires proper input capacitors to supply
surge current during stepping load transients to prevent
the input rail from dropping. Because the parasitic induc-
tor from the voltage sources or other bulk capacitors to
the VIN limit the slew rate of the surge current, place the
Input capacitors near VIN as close as possible. Input ca-
pacitors should be larger than 1µF and a minimum ce-
ramic capacitor of 1µF is necessary.
Output Capacitor
The APL5317 needs a proper output capacitor to main-
tain circuit stability and improve transient response over
temperature and current. In order to insure the circuit
stability, the proper output capacitor value should be larger
than 2.2µF With X5R and X7R dielectrics, 2.2µF is suffi-
cient at all operating temperatures. Large output capaci-
tor value can reduce noise and improve load-transient
response and PSRR, however, it also affects power on
issue. Equation (1) shows the relationship between the
maximum COUT value and VOUT.
COUT(max) = 31- 6 ...............................(1)
VOUT
Where
the
unit
of
C
OUT
is
µF
and
V
OUT
is
V,
Figure 1 shows
the curve of maximum output capacitor over the output
voltage. The output voltage range is from 0.8 to 5.5V and
the output capacitor value should be under the line. Out-
put capacitors must be placed at the load and the ground
pin as close as possible and the impedance of the layout
must be minimized.
31
28
Operation Region and Power Dissipation
The APL5317 maximum power dissipation depends on
the thermal resistance and temperature difference be-
tween the die junction and ambient air. The power dissi-
pation PD across the device is:
P
D
=
(T
J
-
T)
A
/
θJA
where (TJ-TA) is the temperature difference between the
junction and ambient air. θJA is the thermal resistance
between junction and ambient air. Assuming the T =25oC
A
and maximum TJ=160oC (typical thermal limit threshold),
the maximum power dissipation is calculated as:
P =(160-25)/240
D(max)
= 0.56(W)
For normal operation, do not exceed the maximum junc-
tion temperature rating of TJ = 125 oC. The calculated
power dissipation should less than:
P =(125-25)/240
D
= 0.41(W)
The GND provides an electrical connection to ground and
channels heat away. Connect the GND to the ground by
using a large pad or a ground plane.
Layout Consideration
Figure 2 illustrates the layout. Below is a checklist for
your layout:
1. Please place the input capacitors close to the VIN.
2. Ceramic capacitors for load must be placed near
the load as close as possible.
3. To place APL5317 and output capacitors near the
load is good for performance.
4. Large current paths, the bold lines in figure 2,
must have wide tracks.
5. Divider resistor R1 and R2 must be placed near
the SET as close as possible.
25
22
012345 6
Output voltage (V)
Figure 1
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Mar., 2009
11
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet APL5317.PDF ] | |
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