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PDF AX3302 Data sheet ( Hoja de datos )
| Número de pieza | AX3302 | |
| Descripción | PWM Step-Down Controller | |
| Fabricantes | AXElite | |
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AX3302
PWM Step-Down Controller
GENERAL DESCRIPTION
The AX3302 integrates Pulse-Width-Modulation (PWM) control circuit into a single
chip. These devise include a reference voltage source, oscillation circuit, error amplifier
and etc.
AX3302 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 SOT-23-6L mini-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：1.222V to VCC
- Duty ratio：0% to 100% PWM control
- Oscillation frequency：380KHz typ.
- Current Limit (CL), Enable function.
- Thermal Shutdown function.
- Short Circuit Protect (SCP).
- External SW P-channel MOS.
- SOT-23-6L Pb-Free package.
1/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Aug.23, 2010
1 page  
AX3302
Setting the Output Voltage
Application circuit item shows the basic application circuit with AX3302 adjustable
output version. The external resistor sets the output voltage according to the following
equation:
V OUT
1.222V
1
R1
R2
Table 1 Resistor select for output voltage setting
VOUT
R2
R1
5V 1.8K 5.6K
3.3V 3.3K 5.6K
2.5V 1.2K 1.25K
1.8V 4.7K 2.2K
1.5V 4.7K 1.1K
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 output current 3A, ΔIL=0.45A.
Table 2 Inductor select for output voltage setting (AX3302 at VCC=12V)
VOUT 2.5V 3.3V 5V 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+0.3A).
5/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Aug.23, 2010
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AX3302.PDF ] | |
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