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AX3005 Datasheet Preview

AX3005 Datasheet

3A PWM Buck DC/DC Converter

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AX3005
150KHz, 3A PWM Buck DC/DC Converter
GENERAL DESCRIPTION
The AX3005 series are monolithic IC designed for a step-down DC/DC converter, and
own the ability of driving a 3A 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, and current limit is against over current
operating of the output switch. If current limit function occurs and VFB is down below 0.5V,
the switching frequency will be reduced. The AX3005 series operates at a switching
frequency of 150KHz thus allow smaller sized filter components than what would be
needed with lower frequency switching regulators. The output version included fixed 3.3V,
5V, 12V, and an adjustable type. The chip is available in a 5-Lead TO263 package.
FEATURES
- Output voltage: 3.3V, 5V, 12V and adjustable output version.
- Adjustable version output voltage range, 1.23V to 38.5V.
- 150KHz fixed switching frequency.
- Voltage mode non-synchronous PWM control.
- Thermal-shutdown and current-limit protection.
- ON/OFF shutdown control input.
- Short Circuit Protect (SCP).
- Operating voltage can be up to 40V.
- Output load current: 3A.
- 5-Lead TO263 Pb-Free packages.
- Low power standby mode.
- Built-in switching transistor on chip.
1/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.8 Nov.18, 2016




AXElite

AX3005 Datasheet Preview

AX3005 Datasheet

3A PWM Buck DC/DC Converter

No Preview Available !

AX3005
BLOCK DIAGRAM
EN
CURRENT
SOURCE
BIAS
1.235V
REFERENCE
2.5V
REGULATOR
START
UP
220mV
FB
R2
R1
+
_AMP
COMP.
ΩADJ : R2=0 , R1=OPEN
150kHz
OSC.
+
COMP_.
Current
limit
COMP.
+
+
COMP.
CONTROL
+
DRIVER
Thermal
Shutdown
200mV
V CC
3A
SWITCH
SW
Vss
PIN ASSIGNMENT
The package of AX3005 is TO263-5L; the pin assignment is given by:
TO263-5L ( Side View )
Name
Description
VCC Operating voltage input
Metal
Tab
GND
( Top View )
5 EN
4 FB
3 VSS
2 SW
1 VCC
SW Switching output
VSS GND pin
FB Output voltage feedback control
EN ON/OFF Shutdown
2/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.8 Nov.18, 2016


Part Number AX3005
Description 3A PWM Buck DC/DC Converter
Maker AXElite
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AX3005 Datasheet PDF






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