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AX3101 Datasheet

PWM Control 2A Step-Down Converter

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AX3101
PWM Control 2A Step-Down Converter
GENERAL DESCRIPTION
AX3101 consists of step-down switching regulator with PWM control. These devise
include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and
etc.
AX3101 provides low-ripple power, high efficiency, and excellent transient
characteristics. The PWM control circuit is able to every the duty ratio linearly form 0 up to
100%. This converter also contains an error amplifier circuit as well as a soft-start circuit
that prevents overshoot at startup. 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 20V, it is also suitable for the operation
via an AC adapter.
FEATURES
- Input voltage3.6V to 20V
- Output voltage0.8V to VCC
- Duty ratio0% to 100% PWM control
- Oscillation frequency330KHz typ.
- Soft-Start (SS), 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.1.9 Aug.05, 2010




AXElite

AX3101 Datasheet Preview

AX3101 Datasheet

PWM Control 2A Step-Down Converter

No Preview Available !

AX3101
BLOCK DIAGRAM
SW
Vcc
Thermal
Shutdown
Oscillation
Circuit
Reference Voltage
Source with Soft Start
PWM - Switched
Control Circuit
+
-
VEN 110uA
FB
Vss
EN OCSET
PIN ASSIGNMENT
The package of AX3101 is SOP-8L; the pin assignment is given by:
Name
Description
FB Feedback pin
Power-off pin
EN
Hnormal operation(Step-down)
LStep-down operation stopped
(All circuits deactivated)
OCSE Add an external resistor to set max
T switch output current.
VCC IC power supply pin
VSS GND pin
SW
Switch pin. Connect external
inductor and diode here.
ORDER/MARKING INFORMATION
Order Information
AX3101 X X X
Frequency
Package Type Packing
Blank : 330Khz S: SOP-8L
Blank : Tube
A : Taping
Top Marking
AXLogo
3 1 0 1 Part number
Y Y W W X ID code:internal
WW: 01~52
Year: 10=2010
11=2011
2/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.9 Aug.05, 2010


Part Number AX3101
Description PWM Control 2A Step-Down Converter
Maker AXElite
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