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PDF AS1343 Data sheet ( Hoja de datos )
| Número de pieza | AS1343 | |
| Descripción | DC-DC Boost Converter | |
| Fabricantes | austriamicrosystems AG | |
| Logotipo |  |
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Datasheet
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AS1343
42V, 1-2 Cells, Micropower, DC-DC Boost Converter
1 General Description
The AS1343 boost converter contains a 1.4A internal
switch in a tiny TDFN-10 3x3mm package. The device
operates from a 0.9V to 3.6V supply, and can boost volt-
ages up to 42V output.
The output voltage can easily be adjusted by an external
resistor divider.
The AS1343 uses a unique control scheme providing
the highest efficiency over a wide range of load condi-
tions. An internal 1.4A MOSFET reduces external com-
ponent count, and a fixed high switching frequency
(1MHz) allows for tiny surface-mount components.
The AS1343 also features power-OK circuitry which
monitors the output voltage.
Additionally the AS1343 features a low quiescent supply
current and a shutdown mode to save power. During
shutdown an output disconnect switch separates the
input from the output.
The AS1343 is ideal for LCD or OLED panels with low
current requirements and can also be used in a wide
range of other applications.
The device is available in a low-profile TDFN-10 3x3mm
package.
2 Key Features
! 5.5V to 42V Adjustable Output Voltage
! 0.9V to 3.6V Supply Voltage Range
! High Output Currents:
- 30mA @ 12V VOUT, from 1.5V VCC
- 40mA @ 24V VOUT, from 2.5V VCC
! Efficiency: Up to 85%
! Switching Frequency: 1MHz
! Output Disconnect Function
! Output Discharge Function
! Power-OK Output
! Quiescent Current: 22µA
! Shutdown Current: 0.1µA
! TDFN-10 3x3mm Package
Figure 1. AS1343 - Typical Application Diagram
3 Applications
The device is ideal for OLED display power supply, LCD
bias generators, mobile/cordless phones, palmtop com-
puters, PDAs and organizers, handy terminals, driving
LEDs or any other portable, battery-powered device.
VCC = 0.9V
to 3.6V
CIN R3
On
Off
VCC
POK
EN
L1
SWOUT
AS1343
VOUT
D1
LX R1
VOUT = 5.5V to 42V
COUT
FB
R2
PGND
GND
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Revision 1.04
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1 page  
AS1343
Datasheet - Typical Operating Characteristics
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7 Typical Operating Characteristics
Parts used for measurments: 6.8µH (MOS6020-682) Inductor, 10µF (GRM21BR60J106KE19) CIN and 4.7µF
(GRM32ER71H475KA88) COUT, (PMEG4010BEA) D1;
Figure 3. Efficiency vs. Output Current; VOUT = 6V
90
80
70
60
50
40
30
20
10
0
0.1
Vi n =1.5V
Vi n =2V
Vi n =3V
Vi n =3.6V
1 10
Output Voltage (mA)
100
Figure 5. Efficiency vs. Output Current; VOUT = 18V
90
80
70
60
50
40
30
20
10
0
0.1
Vi n =1.5V
Vi n =2V
Vi n =3V
Vi n =3.6V
1 10
Output Current (mA)
100
Figure 4. Efficiency vs. Output Current; VOUT = 12V
90
80
70
60
50
40
30
20
10
0
0.1
Vi n =1.5V
Vi n =2V
Vi n =3V
Vi n =3.6V
1 10
Output Current (mA)
100
Figure 6. Efficiency vs. Output Current; VOUT = 24V
90
80
70
60
50
40
30
20
10
0
0.1
Vi n =2V
Vi n =3V
Vi n =3.6V
1 10
Output Current (mA)
100
Figure 7. Efficiency vs. Input Voltage; VOUT = 12V
90
80
70
60
50
40
30
20
10
0
0.9 1.2 1.5 1.8 2.1 2.4 2.7
Input Voltage (V)
Iout =1mA
Iout =10mA
Iout =50mA
Iout =100mA
3 3.3 3.6
Figure 8. Efficiency vs. Input Voltage; IOUT = 10mA
90
80
70
60
50
40
30
20
10
0
0.9 1.2 1.5 1.8 2.1 2.4 2.7
Input Voltage (V)
Vout =5.5V
Vout =10V
Vout =12V
Vout =15V
3 3.3 3.6
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Revision 1.04
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5 Page 
AS1343
Datasheet - Application Information
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LED Power Supply Application
The AS1343 can also be used for driving LEDs. Just simply connect the LEDs between the pins VOUT and FB. (see
Figure 29).
Figure 29. LED Supply Application
VCC = 0.9V
to 3.6V
C1
10µF
R3
100kΩ
4
VCC
2
POK
On 1
Off EN
5
PGND
L1
6.8µH
7
SWOUT
AS1343
D1
6
LX
9
VOUT
COUT
4.7µF
10
FB
R2
100Ω
3, 8
GND
ILED
The output voltage is adjusted automatically to the required voltage of the LEDs. This voltage depends on the forward
voltage (VF) of the used LEDs and the Feeback Voltage VFB.
Calculate VOUT by:
VOUT = VF(ILED) × n + VFB
(EQ 4)
Note: The brightness of the LEDs can directly be adjusted by setting the current ILED via the corresponding R2.
Calculate R2 by:
Where:
VFB = 1.25V
n .... number of LEDs
ILED = V-----F---B--
R2
(EQ 5)
Thermal Protection
To protect the device from short circuit or excessive power dissipation of the auxiliary NPNs, the integrated thermal
protection switches off the device when the junction temperature (TJ) reaches 140ºC (typ). When TJ decreases to
approximately 135ºC, the device will resume normal operation. If the thermal overload condition is not corrected, the
device will switch on and off while maintaining TJ within the range between 135 and 140ºC.
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| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AS1343.PDF ] | |
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