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AX3133 Datasheet Preview

AX3133 Datasheet

PWM Control 3A Step-Down Converter

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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 voltage8V to 33V
- Output voltage3.3V to 26V
- Duty ratio0% 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




AXElite

AX3133 Datasheet Preview

AX3133 Datasheet

PWM Control 3A Step-Down Converter

No Preview Available !

AX3133
BLOCK DIAGRAM
EN / SS
CURRENT
SOURCE
BIAS
1. 23V
REFERENCE
2.5 V
REGULATOR
START - UP
5uA
V CC
0.815 V
Oscillator
Current
limit
+
_AMP
FB
COMP.
+
COMP.
PWM - Switched
Control Circuit
COMP
OSC
Thermal
Shutdown
SW
VGATE
Vss
PIN ASSIGNMENT
The package of AX3133 is SOP-8L-EP; the pin assignment is given by:
EN/SS 1
VSS 2
VGATE 3
VCC 4
( Top View )
SW
SOP-8L-EP
8 OSC
7 COMP
6 FB
5 SW
Name
EN/SS
VSS
VGATE
VCC
SW
FB
COMP
OSC
Description
ON/OFF Shutdown and Soft-start
pin
GND pin
Driver GATE clamping pin. The
pin must connect a 1uF capacitor
to VCC
IC power supply pin
Switch pin. Connect external
inductor and diode here.
Feedback pin
Compensation pin
Frequency Set Pin. The pin
connect a resistance to GND.
2/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.0 Oct.15, 2010


Part Number AX3133
Description PWM Control 3A Step-Down Converter
Maker AXElite
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AX3133 Datasheet PDF






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