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PDF AX3133 Data sheet ( Hoja de datos )
| Número de pieza | AX3133 | |
| Descripción | PWM Control 3A Step-Down Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AX3133 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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AX3133
PWM Control 3A Step-Down Converter
GENERAL DESCRIPTION
AX3133 consists of step-down switching regulator with PWM control. These devise
include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and
etc.
AX3133 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 is build out soft start function that prevents overshoot and inrush current at
startup. 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. The operating
frequency is decided by outside resistance. An external compensation is easily to system
stable; the low ESR output capacitor can be used.
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 with
exposed pad package, providing such outstanding features as low current consumption.
Since this converter can accommodate an input voltage up to 32V, it is also suitable for the
operation via an AC adapter.
FEATURES
- Input voltage：8V to 33V
- Output voltage：3.3V to 26V
- Duty ratio：0% to 100% PWM control
- Oscillation frequency range is 50K~350KHz by outside resistance setting
- Enable with Soft-Start function
- Current Limit, Short Circuit Protect (SCP) and Thermal Shutdown protection
- Built-in internal SW P-channel MOS.
- SOP-8L-EP Pb-Free package.
1/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.0 Oct.15, 2010
1 page  
AX3133
APPLICATION CIRCUIT
EL cap
VIN+8~32V
C5
470uF
C1
1uF
C6
0.1uF
R5 C10 C7
(Option) 0.1uF 0.1uF
AX3133ES
VCC
SW
VGATE
FB
EN/SS COMP
GND
OSC
R3
R2
C9
L1
1
2
D1
B340
R1
5.6K
R4
1.1K
VOUT = 5V/3A
C2
C3
0.1uF
C4
470uF
R1
VOUT = VFB x (1 +
)
R4
VFB = 0.815V ; R4 suggest 0.8K ~ 3k
COUT ESR Range
30m~80mΩ
80m~300mΩ
Compensation Table
Frequency(Hz) VIN RANGE
50K
150K
250K
350K
50K
8~30V
150K
250K
350K
R2 C9 C2 L1
100R 4n7 3300p 100u
100R 4n7 1500p 68u
470R 10n 1500p 33u
470R 1n 680p 22u
100R 4n7 3300p 100u
100R 4n7 820p 68u
470R 10n 1500p 33u
100R 4n7 180p 22u
FUNCTION DESCRIPTIONS
EN/SS
This pin can be supplied shutdown or soft start function. It is inside pull high function.
For normal application, the pin must be connected a capacitor to ground. There is a 5uA
current to charge this capacitor, vary the different capacitor value to control soft start time.
Allow the switching regulator circuit to be shutdown pulling this pin below a 0.8V threshold
voltage.
5/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.0 Oct.15, 2010
5 Page 
PACKAGE OUTLINES
X
AX3133
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.1.0 Oct.15, 2010
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet AX3133.PDF ] | |
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