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PDF AX3103 Data sheet ( Hoja de datos )
| Número de pieza | AX3103 | |
| Descripción | PWM Control 3A Step-Down Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AX3103 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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AX3103
PWM Control 3A Step-Down Converter
GENERAL DESCRIPTION
AX3103 consists of step-down switching regulator with PWM control. These devise
include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and
etc.
AX3103 provides low-ripple power, high efficiency, and excellent transient characteristics.
The PWM control circuit is able to the duty ratio linearly form 0 up to 100%. This converter
also contains an error amplifier circuit as well as a soft-start circuit that prevents overshoot
at startup. An enable function, an over current protect function and short circuit protect
function are built inside, and when OCP or SCP happens, the operation frequency will be
reduced. Also, an internal compensation block is built in to minimum external component
count.
With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode
connected externally, these ICs can function as step-down switching regulators. They
serve as ideal power supply units for portable devices when coupled with the SOP-8L
package, providing such outstanding features as low current consumption. Since this
converter can accommodate an input voltage up to 23V, it is also suitable for the operation
via an AC adapter.
FEATURES
- Input voltage：3.6V to 23V
- Output voltage：0.8V to VCC
- Duty ratio：0% to 100% PWM control
- Oscillation frequency：330KHz typ.
- Soft-start (SS), Current Limit (CL), Enable function.
- Thermal Shutdown function.
- Short Circuit Protect (SCP).
- Built-in internal SW P-channel MOS.
- Low ESR output capacitor (Multi-layer chip capacitor (MLCC)) application.
- SOP-8L Pb-Free package.
Axelite Confidential Materials, do not copy or distribute without written consent.
1/11
1 page  
AX3103
FUNCTION DESCRIPTIONS
PWM Control
The AX3103 consists of DC/DC converters that employ a pulse-width modulation
(PWM) system. In converters of the AX3103, the pulse width varies in a range from 0 to
100%, according to the load current. The ripple voltage produced by the switching can
easily be removed through a filter because the switching frequency remains constant.
Therefore, these converters provide a low-ripple power over broad ranges of input voltage
and load current.
Setting the Output Voltage
Application circuit item shows the basic application circuit with adjustable output
version. The external resistor sets the output voltage according to the following equation:
V OUT
0.8V
1
R1
R2
Table 1 Resistor select for output voltage setting
VOUT
COUT
R2
5V
EL
MLCC
1.3K
7.5K
3.3V
EL
MLCC
1.5K
15K
2.5V
EL
MLCC
2.2K
22K
1.8V EL
2K
R1
6.8K
39K
4.7K
47K
4.7K
47K
2.5K
1.5V EL 2.2K 2.0K
1.2V EL
3K 1.5K
Inductor Selection
For most designs, the operates with inductors of 12µH to 33µH. The inductor value
can be derived from the following equation:
V V V
OUT
IN OUT
L V I f
IN L OSC
5/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.2.3 Mar.29, 2011
5 Page 
PACKAGE OUTLINES
AX3103
b
D
7 (4X)
L
DETAIL A
θ
e
y
Symbol
A
A1
A2
C
D
E
H
L
b
e
y
θ
Dimensions in Millimeters
Min. Nom.
Max.
- - 1.75
0.1 - 0.25
1.25 -
-
0.1 0.2 0.25
4.7 4.9
5.1
3.7 3.9
4.1
5.8 6
6.2
0.4 - 1.27
0.31 0.41
0.51
1.27 BSC
- - 0.1
0O -
8O
Mold flash shall not exceed 0.25mm per side
JEDEC outline: MS-012 AA
DETAIL A
Dimensions in Inches
Min. Nom. Max.
- - 0.069
0.04 - 0.1
0.049
-
-
0.0075 0.008 0.01
0.185
0.193
0.2
0.146
0.154 0.161
0.228
0.236 0.244
0.015
- 0.05
0.012
0.016 0.02
0.050 BSC
- - 0.004
0O - 8O
11/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.2.3 Mar.29, 2011
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet AX3103.PDF ] | |
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