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PDF AS1340 Data sheet ( Hoja de datos )
| Número de pieza | AS1340 | |
| Descripción | DC-DC Boost Converter | |
| Fabricantes | austriamicrosystems AG | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AS1340 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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AS1340
50V, Micropower, DC-DC Boost Converter
1 General Description
The AS1340 boost converter contains a 1.4A internal switch in a tiny
TDFN-8 3x3mm package. The device operates from a 2.7 to 5.5V
supply, and can boost voltages up to 50V output.
The output voltage can easily be adjusted by an external resistor
divider.
The AS1340 uses a unique control scheme providing the highest
efficiency over a wide range of load conditions. An internal 1.4A
MOSFET reduces external component count, and a fixed high
switching frequency (1MHz) allows for tiny surface-mount
components.
The AS1340 also features power-OK circuitry which monitors the
output voltage.
Additionally the AS1340 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 AS1340 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-8 3x3mm package.
Figure 1. AS1340 - Typical Application Diagram
2 Key Features
2.7V to 50V Adjustable Output Voltage
2.7V to 50V Input Voltage Range
2.7V to 5.5V Supply Voltage Range
High Output Currents:
- 100mA @ 12V from 3.3V VIN
- 50mA @ 24V from 3.3V VIN
- 30mA @ 36V from 3.3V VIN
Efficiency: Up to 93%
Switching Frequency: 1MHz
Output Disconnect
Power-OK Output
Operating Supply Current: 30µA
Shutdown Current: 0.1µA
TDFN-8 3x3mm Package
3 Applications
The device is ideal for OLED display power supply, LED power
supply, LCD bias generators, mobile/cordless phones, palmtop
computers, PDAs and organizers, handy terminals or any other
portable, battery-powered device.
VIN = 2.7V
to 5.5V
CIN
On
Off
2
VCC
4
POK
1
EN
L1
4.7µH
3
SWVIN
6
SWOUT
AS1340
5
LX
8
FB
7, 9
GND
VOUT = > VIN to 50V
R1 COUT
R2
VIN = 2.7V to
5.5V
VCC
VIN = 2.7V to
~VOUT
VIN = 2.7V to
5.5V
VCC
L1
36
L1
36
LX
LX
VOUT
VOUT
If not needed the output disconnect switch can be left unconnected which will also increase the efficiency.
Additionally the supply of the chip can be split to allow higher supply voltages for the coil. In this case the output disconnect switch must not be used.
www.ams.com/DC-DC_Step-Up/AS1340
Revision 1.20
1 - 17
1 page  
AS1340
Datasheet - Typical Operating Characteristics
7 Typical Operating Characteristics
Parts used for measurements: 4.7µH (LPS4018-472ML) Inductor, 10µF (GRM32DR71C106KA01) CIN and 1µF (GRM31MR71H105KA88)
COUT.
Figure 3. Efficiency vs. Output Current; VOUT = 36V
100
Figure 4. Efficiency vs. Output Current; VOUT = 24V
100
90 90
80 80
70 70
60 60
50 50
40 40
30 30
20
10
0
0.1
Vi n =2.7V
Vi n =3.3V
Vi n =5.5V
1 10
Output Current (mA)
100
20
10
0
0.1
Vi n =2.7V
Vi n =3.3V
Vi n =5.5V
1 10
Output Current (mA)
100
Figure 5. Efficiency vs. Output Current; VOUT = 12V
100
Figure 6. Efficiency vs. Output Current; VOUT = 6V
100
90 90
80 80
70 70
60 60
50 50
40 40
30 30
20 20Vin=2.7V
Vi n =2.7V
Vi n =3.3V
Vi n =3.3V
10 10Vin=5.5V
Vi n =5.5V
00
0.1 1 10 100
Output Current (mA)
0.1 1 10 100
Output Current (mA)
Figure 7. Efficiency vs. VIN; VOUT=18V, Split Supplies
100
Figure 8. Efficiency vs. VIN; IOUT = 10mA
100
90 90
80 80
70 70
60 60
50
40
2
Iout =1mA
Iout =10mA
Iout =50mA
Iout =5mA
Iout =20mA
4 6 8 10
Input Voltage (V)
12
50 Vout =6V
Vout =18V
Vout =12V
Vout =24V
Vout =30V
Vout =36V
Vout =48V
40
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
www.ams.com/DC-DC_Step-Up/AS1340
Revision 1.20
5 - 17
5 Page 
AS1340
Datasheet - Application Information
9.5 LED Power Supply Application
The AS1340 can also be used for driving LEDs. Just simply connect the LEDs between the pins LX and FB. (see Figure 29).
Figure 29. LED Supply Application
VIN = 2.7V
to 5.5V
C1
0.1µF
On
Off
2
VCC
3
SWVIN
6
SWOUT
L1
4.7µH
4 AS1340
POK
1
EN
D1
5
LX
COUT
1µF
8
FB ILED
R2
100
7,9
GND
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 Feedback Voltage VFB.
Calculate VOUT by:
VOUT = VFILED n + VFB
(EQ 3)
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 LED’s
ILED = V-----F---B--
R2
(EQ 4)
www.ams.com/DC-DC_Step-Up/AS1340
Revision 1.20
11 - 17
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AS1340.PDF ] | |
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