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AX3103A Datasheet Preview

AX3103A Datasheet

PWM Control 3A Step-Down Converter

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AX3103A
PWM Control 3A Step-Down Converter
GENERAL DESCRIPTION
AX3103A consists of step-down switching regulator with PWM control. These devise
include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and
etc.
AX3103A 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 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 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 frequency500KHz typ.
- Soft-start (SS), Current Limit (CL), Enable function.
- Thermal Shutdown function.
- Short Circuit Protect (SCP).
- Built-in internal SW P-channel MOS.
- Low ESR output capacitor (Multi-layer chip capacitor (MLCC) application.
- SOP-8L Pb-Free package.
1/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.5 Aug.10, 2010




AXElite

AX3103A Datasheet Preview

AX3103A Datasheet

PWM Control 3A Step-Down Converter

No Preview Available !

AX3103A
BLOCK DIAGRAM
SW
Vcc
Thermal
Shutdown
Oscillator Reference Voltage
Circuit
with Soft Start
PWM Switched
Control Circuit
+
-
Current
VEN Limit
FB
Vss
EN Comp
PIN ASSIGNMET
The package of AX3103A is SOP-8L; the pin assignment is given by:
( Top View )
FB 1
EN 2
Comp 3
Vcc 4
SOP-8L
8 Vss
7 Vss
6 SW
5 SW
Name
FB
EN
Comp
VCC
SW
VSS
Description
Feedback pin
Power-off pin
Hnormal operation(Step-down)
LStep-down operation stopped
(All circuits deactivated)
Compensation pin
IC power supply pin
Switch pin. Connect external
inductor/diode here.
GND pin
ORDER/MARKING INFORMATION
Order Information
AX3103 X X X
Frequency
A : 500Khz
Package Type Packing
S: SOP-8L
Blank : Tube
A : Taping
Top Marking
AXLogo 3 1 0 3
A YYWWX
AX3103A
Part number
ID code:internal
WW: 01~52
Year: 10=2010
11=2011
2/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.5 Aug.10, 2010


Part Number AX3103A
Description PWM Control 3A Step-Down Converter
Maker AXElite
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