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AX3011 Datasheet Preview

AX3011 Datasheet

2A PWM Buck DC/DC Converter

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AX3011
50KHz, 2A PWM Buck DC/DC Converter
GENERAL DESCRIPTION
The AX3011 series are monolithic IC designed for a step-down DC/DC converter, and
own the ability of driving a 2.5A load without additional transistor. It saves board space. The
external shutdown function can be controlled by logic level and then come into standby
mode. The internal compensation makes feedback control having good line and load
regulation without external design. Regarding protected function, thermal shutdown is to
prevent over temperature operating from damage; current limit is against over current
operating of the output switch that set by outside resistance. If current limit function occurs
and VFB is down below 0.3V, the switching frequency will be reduced to 10 KHz; and over
voltage protection (OVP) that can avoid high VOUT voltage to damage circuit and capacitor.
The chip is available in SOP-8L-EP package which features small size as SOP-8L with an
Exposed Pad to reduce the junction-to-case resistance.
FEATURES
- Operating voltage can be up to 40V.
- Maximum adjustable output voltage up to 38V.
- Typical switching frequency is 50K Hz.
- Voltage mode non-synchronous PWM converter.
- Thermal-shutdown and current-limit protection.
- Short Circuit Protect (SCP).
- External current limit setting.
- Over Voltage Protect (OVP) Sense and Output.
- Output load current: 2A.
- Low power standby mode.
- Built-in switching transistor on chip.
- SOP-8L-EP Pb-Free packages.
1/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 Aug.04, 2010




AXElite

AX3011 Datasheet Preview

AX3011 Datasheet

2A PWM Buck DC/DC Converter

No Preview Available !

AX3011
BLOCK DIAGRAM
V CC
OVP
SENSE
CURRENT
SOURCE
BIAS
1.25V
REFERENCE
+
COMP_.
1.155V
2.5V
REGULATOR
50kHz
OSC.
START-UP
+
COMP_.
Current
limit
COMP.
+
+
_AMP
COMP.
+
COMP.
CONTROL
+
DRIVER
Thermal
Shutdown
OCSET
2.0A
SWITCH
SW
Vss
FB COMP
PIN ASSIGNMENT
The package of AX3011 is SOP-8L-EP; the pin assignment is given by:
SW 1
OVP 2
SENSE 3
FB 4
( Top View )
Vss
SOP-8L-EP
8 Vcc
7 OCSET
6 Vss
5 COMP
Name
VCC
OCSET
VSS
FB
SW
OVP
COMP
SENSE
Description
Operating voltage input
Add an external resistor to set
max switch output current
GND pin
Output voltage feedback control
Switch pin. Connect external
inductor and diode here.
OVP Output pin.
Compensation pin
Over Voltage Sense Input
ORDER/MARKING INFORMATION
Order Information
AX3011 XX X
Package Type Packing
ES: EP-SOP-8L Blank : Tube
A : Taping
Top Marking
Logo
AX 3 0 1 1
YYWWX
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.1.4 Aug.04, 2010


Part Number AX3011
Description 2A PWM Buck DC/DC Converter
Maker AXElite
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