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AX3120 Datasheet Preview

AX3120 Datasheet

2.5A Synchronous buck Converter

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AX3120
2.5A Synchronous buck Converter
GENERAL DESCRIPTION
AX3120 consists of step-down switching regulator with synchronous PWM converter.
These devise include a reference voltage source, oscillation circuit, error amplifier, internal
PMOS and NMOS etc.
AX3120 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 an enable/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 external compensation is easily to system stable.
With the addition of internal PMOS and NMOS, a coil and capacitors 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-EP package, providing such
outstanding features as low current consumption. Since this converter can accommodate
an input voltage up to 23V.
FEATURES
- Input voltage4.5V to 23V
- Output voltageVFB to VCC
- Duty ratio0% to 100% PWM control
- Oscillation frequency250KHz typ.
- Enable/Soft-Start and Current Limit (CL).
- Thermal Shutdown function.
- Short Circuit Protect (SCP).
- Built-in internal SW P-channel and N-channel MOS.
- SOP-8L with Exposed Pad Pb-Free package.
1/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.5 Aug.31, 2010




AXElite

AX3120 Datasheet Preview

AX3120 Datasheet

2.5A Synchronous buck Converter

No Preview Available !

AX3120
BLOCK DIAGRAM
SVcc
6uA
Soft-Start
EN/SS
PVcc
3.5V VEN CLM
FB
SGND
0.62V
PWM - Switched
Control Circuit
Oscillation
Circuit
Thermal
Shutdown
PMOS
SW
NMOS
PGND
COMP
PIN ASSIGNMENT
The package of AX3120 is SOP-8L-EP; the pin assignment is given by:
EN/SS 1
SGND 2
SVcc 3
PVcc 4
( Top View )
Exposed
Pad
(SW)
SOP-8L-EP
Name
Description
EN/SS
ON/OFF Shutdown and Soft-start
pin
8 COMP
7 FB
6 PGND
5 SW
SGND
SVcc
PVCC
SW
PGND
Signal ground pin
IC power supply pin
Driver power supply pin
Switch pin. Connect
inductor here.
Power ground pin
external
FB Feedback pin
COMP Compensation pin
2/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.5 Aug.31, 2010


Part Number AX3120
Description 2.5A Synchronous buck Converter
Maker AXElite
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