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AX4101 Datasheet

PWM Control 2.5A Step-Down Converter

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AX4101
PWM Control 2.5A Step-Down Converter
GENERAL DESCRIPTION
AX4101 consists of step-down switching regulator with PWM control. These devise
include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and
etc.
AX4101 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. Also,
an internal compensation block is built in to minimum external component count.
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 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 voltage3.6V to 23V
- Output voltage0.8V to VCC
- Duty ratio0% to 100% PWM control
- Oscillation frequency330KHz typ.
- Current Limit (CL), Enable function.
- Thermal Shutdown function.
- Short Circuit Protect (SCP).
- Built-in internal SW P-channel MOS.
- SOP-8L Pb-Free package.
1/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.6 Aug.06, 2010




AXElite

AX4101 Datasheet Preview

AX4101 Datasheet

PWM Control 2.5A Step-Down Converter

No Preview Available !

AX4101
BLOCK DIAGRAM
SW
Vcc
Thermal
Shutdown
Oscillation
Circuit
Reference Voltage
PWM - Switched
Control Circuit
+
-
110uA
VEN
FB
Vss
EN OCSET
PIN ASSIGNMENT
The package of AX4101 is SOP-8L; the pin assignment is given by:
Name
Description
FB Feedback pin
EN
OCSET
Power-off pin
Hnormal operation(Step-down)
LStep-down operation stopped
(All circuits deactivated)
Add an external resistor to set
max switch output current.
VCC IC power supply pin
SW
Switch pin. Connect external
inductor and diode here.
VSS GND pin
ORDER/MARKING INFORMATION
Order Information
Top Marking
AX4101 X X X
AXLogo
4 1 0 1 Part number
Y Y W W X ID code:internal
Frequency Package Type Packing
WW: 01~52
Blank : 330Khz S: SOP-8L
Blank : Tube
A : Taping
Year: 10=2010
11=2011
2/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.6 Aug.06, 2010


Part Number AX4101
Description PWM Control 2.5A Step-Down Converter
Maker AXElite
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