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PDF AX3301 Data sheet ( Hoja de datos )
| Número de pieza | AX3301 | |
| Descripción | PWM Step-Down Controller | |
| Fabricantes | AXElite | |
| Logotipo |  |
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AX3301
PWM Step-Down Controller
GENERAL DESCRIPTION
The AX3301 integrates Pulse-Width-Modulation (PWM) control circuit into a single
chip. These devise include a reference voltage source, oscillation circuit, error amplifier
and etc.
AX3301 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%.
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.
With the addition of an external P-channel Power MOS, a coil, capacitors, and a
diode connected externally, these components can function as step-down switching
regulators. They serve as ideal power supply units for portable devices when coupled with
the SOP-8L and MSOP-8L mini-package, providing such outstanding features as low
current consumption. Since this converter can accommodate an input voltage up to 24V, it
is also suitable for the operation via an AC adapter.
FEATURES
- Input voltage：4V to 24V
- Output voltage：0.8V to VCC
- Duty ratio：0% to 100% PWM control
- Oscillation frequency：330KHz typ.
- Current Limit (CL), Enable function.
- Thermal Shutdown function.
- Short Circuit Protect (SCP).
- External SW P-channel MOS.
- MSOP-8L and SOP-8L Pb-Free packages.
1/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.5 Aug.23, 2010
1 page  
AX3301
Setting the Output Voltage
Application circuit item shows the basic application circuit with AX3301 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
R2
R1
5V
1.3K 6.8K
5.6K 30K
3.3V
1.5K
5.6K
4.7K
18K
2.5V
2.2K
5.6K
4.7K
12K
1.8V 1.2K 1.5K
1.5V 2.2K 2.0K
Inductor Selection
For most designs, Low inductance values are physically smaller but require faster
switching, which results in some efficiency loss. The inductor value can be derived from
the following equation:
V V V
OUT
IN OUT
L V I f
IN L LX
Where is inductor Ripple Current. Large value inductors lower ripple current and
small value inductors result in high ripple currents. Choose inductor ripple current
approximately 15% of the maximum input current 3A, ΔIL=0.45A.
Table 2 Inductor select for output voltage setting (AX3301 at VIN=12V)
VOUT 2.5V(3A) 3.3V(3A) 5V(3A) 3.3V(5A) 5V(5A)
L1 Value 15uH 18uH 22uH 12uH 15uH
The DC current rating of the inductor should be at least equal to the maximum load
current plus half the ripple current to prevent core saturation (3A+0.25A).
5/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.5 Aug.23, 2010
5 Page 
PACKAGE OUTLINES
(1) SOP-8L
AX3301
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
11/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.5 Aug.23, 2010
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AX3301.PDF ] | |
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