AX3002 Datasheet PDF - AXElite

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AX3002
AXElite

Part Number AX3002
Description 3A PWM Buck DC/DC Converter
Page 13 Pages


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AX3002
150KHz, 3A PWM Buck DC/DC Converter
™ GENERAL DESCRIPTION
The AX3002 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 AX3002 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 chips are available in a 5-Lead TO-263 and 5-Lead TO-220
packages.
™ FEATURES
- Output voltage: 3.3V, 5V, 12V and adjustable output version.
- Adjustable version output voltage range, 1.23V to 19.5V.
- 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 22V.
- Output load current: 3A.
- 5-Lead TO-263 & 5-Lead TO-220 Pb-Free packages.
- Low power standby mode.
- Built-in switching transistor on chip.
1/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.6 Mar.12, 2008
Free Datasheet http://www.nDatasheet.com



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150KHz, 3A PWM Buck DC/DC Converter AX3002
™ BLOCK DIAGRAM
EN
CURRENT
SOURCE
BIAS
1.235V
REFERENCE
2.5V
REGULATOR
START
UP
220mV
FB
R2
R1
+
_AMP
COMP.
ADJ : R2=0Ω, 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 AX3002 are TO263-5L and TO220-5L(R); the pin assignment is given by:
TO263-5L ( Side View )
Metal
Tab
GND
( Top View )
5 EN
4 FB
3 VSS
2 SW
1 VCC
Name
VCC
SW
VSS
FB
EN
Description
Operating voltage input
Switching output
GND pin
Output voltage feedback control
ON/OFF Shutdown
TO220-5L ( Side View )
TO220-5LR ( Side View )
Metal
Tab
GND
( Top View )
5 EN
4 FB
3 VSS
2 SW
1 VCC
Metal
Tab
GND
( Top View )
2/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.6 Mar.12, 2008
5 EN
4 FB
3 VSS
2 SW
1 VCC
Free Datasheet http://www.nDatasheet.com



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150KHz, 3A PWM Buck DC/DC Converter AX3002
™ ORDER INFORMATION
Order Information
AX3002 - XX X X
Output Voltage Package Type Packing
33:3.3V M5: TO263-5L Blank : Tube
50:5.0V T5 :TO220-5L A : Taping
12: 12V T5R:TO220-5L-R
Blank:ADJ
™ MARKING INFORMATION
Top Marking
ADJ Version
AXLogo
3002
XXXXX
Part number
ID code: internal
WW: 01~52
Year : 07 = 2007
FIXED Version (VOUT=5.0V)
AXLogo
3002
-50
XXXXX
Part number
Output Voltage
ID code: internal
WW: 01~52
Year : 07 = 2007
3/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.6 Mar.12, 2008
Free Datasheet http://www.nDatasheet.com



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150KHz, 3A PWM Buck DC/DC Converter AX3002
™ Absolute Maximum Ratings
Characteristics
Symbol
Rating
Unit
Maximum Supply Voltage
VCC +24
V
ON/OFF Pin Input Voltage
VEN -0.3 to VCC
V
Feedback Pin Voltage
VFB -0.3 to VCC
V
Output Voltage to Ground
VOUT -0.8
V
Power Dissipation Internally limited
PD ( TJ-TA ) / θJA W
Storage Temperature Range
TST -65 to +150
Operating Junction Temperature Range
TJ
-40 to +125
Operating Supply Voltage
VOP +4.5 to +22
V
Thermal Resistance from Junction to case
θJC TO263=3.5,TO220=3.5 /W
Thermal Resistance from Junction to ambient
θJA TO263=25,TO220=25 /W
Note : θJA is measured with the PCB copper area(need connect to Metal tab) of approximately 3 in2 (Multi-layer).
™ Electrical Characteristics (Unless otherwise specified, Ta=25°C, VCC=12V for 3.3V, 5V,
adjustable version and VCC=18V for the 12V version. ILOAD = 0.2A)
Characteristics
Symbol
Conditions
Min Typ Max Units
Quiescent Current
Feedback bias current
Shutdown supply Current
Oscillator frequency
Oscillator frequency of short
circuit protect
Max. Duty Cycle (ON)
Min. Duty Cycle (OFF)
Current limit
Saturation voltage
SW pin=0V
SW pin=-0.8V
SW pin
leakage
current
ICCQ VFB=12V force driver off
4 8 mA
IFB
VFB=1.3V
(Adjustable version only)
-10 -50 nA
ISD
EN pin=5V
VCC=22V
35 100 uA
FOSC 127 150 173 KHz
FSCP
(Adjustable) When VFB<0.5V
(Fixed)When < VOUT*40%
50 KHz
50 KHz
DC VFB=0V force driver on
VFB=12V force driver off
100
0%
ICL
Pear current, No outside circuit
V FB=0V force driver on
3.3
A
VSA T
IOUT=3A, No outside circuit
VFB=0V force driver on
1.3 1.5 V
No outside circuit
ISW L VFB=12V force driver off
VCC=22V force driver off
-200 uA
-5 mA
EN pin logic input threshold
voltage
EN pin logic input current
EN pin input current
Thermal shutdown Temp
VIL Low (regulator ON)
VIH High (regulator OFF)
IH VEN=2.5V (OFF)
IL VEN=0.5V (ON)
TSD
-
2.0
1.3
0.6
-
V
-0.1 -0.5
-0.01 uA
135
4/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.6 Mar.12, 2008
Free Datasheet http://www.nDatasheet.com



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