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PDF AX3121 Data sheet ( Hoja de datos )
| Número de pieza | AX3121 | |
| Descripción | 3.5A Synchronous buck Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AX3121 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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AX3121
3.5A Synchronous buck Converter
GENERAL DESCRIPTION
AX3121 consists of step-down switching regulator with synchronous PWM converter.
These devise include a reference voltage source, oscillation circuit, error amplifier, internal
PMOS and NMOS etc.
AX3121 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 an enable/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 external compensation is easily to system stable.
With the addition of internal PMOS and NMOS, a coil and capacitors 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-EP package, providing such
outstanding features as low current consumption. Since this converter can accommodate
an input voltage up to 23V.
FEATURES
- Input voltage：4.5V to 23V
- Output voltage：VFB to VCC
- Duty ratio：0% to 100% PWM control
- Oscillation frequency：250KHz typ.
- Enable/Soft-Start and Current Limit (CL).
- Thermal Shutdown function.
- Short Circuit Protect (SCP).
- Built-in internal SW P-channel and N-channel MOS.
- SOP-8L with Exposed Pad Pb-Free package.
1/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 Aug.31, 2010
1 page  
AX3121
FUNCTION DESCRIPTIONS
PWM Control
The AX3121 consists of DC/DC converters that employ a synchronous pulse-width
modulation (PWM) system. In converters of the AX3121, 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
0.62V
1
R2
R5
Table 1 Resistor select for output voltage setting
VOUT
R5
R2
5.0V 4.7K 33K
3.3V 3K 13K
2.5V 3.3K 10K
1.8V 6.8K 13K
1.5V 3.3K 4.7K
1.184V
3.3K
3.0K
1.0V 3.3K 2.0K
COMP
Compensation pin. For EL output capacitor application, the COMP pin connects R4
and C9 to GND for all condition and for MLCC output capacitor application, the COMP
connects R4 and C8 to FB, please refer the application circuit table.
5/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 Aug.31, 2010
5 Page 
PACKAGE OUTLINES
X
AX3121
Expose Pad
b
D
7 (4X)
L
DETAIL A
θ
e
y
Symbol
Dimensions in Millimeters
Min. Nom. Max.
A - - 1.75
A1 0
- 0.15
A2 1.25
-
-
C 0.1 0.2 0.25
D 4.7 4.9 5.1
E 3.7 3.9 4.1
H 5.8 6 6.2
L 0.4 - 1.27
b 0.31 0.41 0.51
e 1.27 BSC
y - - 0.1
X - 2.34 -
Y - 2.34 -
θ 0O - 8O
Mold flash shall not exceed 0.25mm per side
JEDEC outline: MS-012 BA
DETAIL A
Dimensions in Inches
Min. Nom. Max.
- - 0.069
0 - 0.06
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
- 0.092 -
- 0.092 -
0O - 8O
11/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 Aug.31, 2010
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet AX3121.PDF ] | |
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