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AX2003 PDF даташит

Спецификация AX2003 изготовлена ​​​​«AXElite» и имеет функцию, называемую «0.25V Feedback Voltage Step-Down Switching Regulators».

Детали детали

Номер произв AX2003
Описание 0.25V Feedback Voltage Step-Down Switching Regulators
Производители AXElite
логотип AXElite логотип 

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AX2003 Даташит, Описание, Даташиты
AX2003/A
3A, 0.25V Feedback Voltage Step-Down
Switching Regulators for LED Driver
™ GENERAL DESCRIPTION
AX2003/A consists of step-down switching regulator with PWM control. These
devise include a reference voltage source, oscillation circuit, error amplifier, internal
PMOS and etc.
AX2003/A provides low-ripple power, high efficiency, and excellent transient
characteristics. The PWM control circuit is able to the duty ratio linearly from 0 up to
100%. 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 voltage0.25V to Vcc
- LED Backlight and High Power LED Application
- Duty ratio0% to 100% PWM control
- Oscillation frequency
AX2003 : 330KHz typ.
AX2003A: 500KHz typ.
- Enable/Disable function.
- Current Limit (CL), Thermal Shutdown and Short Circuit Protections (SCP).
- Built-in internal SW P-channel MOS.
- Low ESR output capacitor (Multi-layer chip capacitor (MLCC)) application.
- SOP-8L Pb-Free package.
1/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Feb.16, 2009
www.DataSheet.in









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AX2003 Даташит, Описание, Даташиты
LED Driver (3A, 0.25V FB Voltage) AX2003
™ Block Diagram
SW
Vcc
Thermal
Shutdown
Oscillator
Circuit
Reference Voltage
PWM Switched
Control Circuit
+
-
Current
VEN Limit
FB
Vss
EN Comp
™ PIN ASSIGNMET
The package of AX2003/A is SOP-8L; the pin assignment is given by:
( Top View )
FB 1
EN
Comp
2
3
Vcc 4
AX2003/A
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
AX2003 X X X
Frequecny
Package Type Packing
Blank : 330KHz S: SOP-8L Blank : Tube
A : 500KHz
A : Taping
Top Marking
Logo AX 2003
AXXXXX
AX2003A
Part number
ID code: internal
WW: 01~52
Year : 08 = 2008
2/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Feb.16, 2009
www.DataSheet.in









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AX2003 Даташит, Описание, Даташиты
LED Driver (3A, 0.25V FB Voltage) AX2003
™ Absolute Maximum Ratings (at Ta=25)
Characteristics
Symbol
Rating
Unit
VCC Pin Voltage
VCC VSS - 0.3 to VSS + 25
V
Feedback Pin Voltage
VFB VSS - 0.3 to VCC
V
ON/OFF Pin Voltage
VEN VSS - 0.3 to VCC + 0.3
V
Switch Pin Voltage
VSW VSS - 0.3 to VCC + 0.3
V
Power Dissipation
PD Internally limited mW
Storage Temperature Range
TST -40 to +150
Operating Temperature Range
TOP -40 to +125
Operating Supply Voltage
VOP +3.6 to +23
V
Thermal Resistance from Junction to case
θJC
25 /W
Thermal Resistance from Junction to ambient θJA
70 /W
Note : θJA is measured with the PCB copper area(need connect to SW pins) of approximately 1 in2(Multi-layer).
™ Electrical Characteristics (VIN = 12V, Ta=25°C, unless otherwise specified)
Characteristics
Symbol
Conditions
Min Typ
Feedback Voltage
Quiescent Current
Feedback Bias Current
Shutdown Supply Current
VFB IOUT=0.2A
0.24 0.25
ICCQ VFB=1.2V force driver off
-
3
IFB IOUT=0.1A
- 0.1
ISD VEN =0V
-2
Switch Current
ISW
4.0 -
Line Regulation
VOUT/VOUT VCC = 5V~23V, IOUT=0.2A
-
1
Load Regulation
VOUT/VOUT IOUT = 0.1 to 3A
- 0.2
Oscillation Frequency
FOSC AX2003
AX2003A
260 330
400 500
EN Pin Logic input
VSH High (regulator ON)
2.0 -
threshold voltage
VSL Low (regulator OFF)
--
EN Pin Input Current
ISH VEN=2.5V (ON)
ISL VEN=0.3V (OFF)
- 20
- -10
Internal MOSFET RDSON
RDSON
VCC=5V, VFB=0V
VCC=12V, VFB=0V
- 90
- 70
Efficiency
EFFI
VOUT = 5V
IOUT = 2A
IOUT = 3A
- 92
- 91
Max Units
0.26 V
5 mA
0.5 uA
10 uA
-A
2%
0.5 %
400 KHz
600 KHz
-
0.8 V
- uA
- uA
140 m
90
-
%
-
Thermal shutdown Temp
TSD
- 140 -
3/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Feb.16, 2009
www.DataSheet.in










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