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AX2003A の電気的特性と機能

AX2003AのメーカーはAXEliteです、この部品の機能は「0.25V Feedback Voltage Step-Down Switching Regulators」です。


製品の詳細 ( Datasheet PDF )

部品番号 AX2003A
部品説明 0.25V Feedback Voltage Step-Down Switching Regulators
メーカ AXElite
ロゴ AXElite ロゴ 




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AX2003A Datasheet, AX2003A PDF,ピン配置, 機能
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

1 Page





AX2003A pdf, ピン配列
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


3Pages


AX2003A 電子部品, 半導体
LED Driver (3A, 0.25V FB Voltage) AX2003
I LED
=
⎜⎛
0.25V
R2
⎟⎞
Table 1 Resistor select for LED output current setting
ILED R2
350mA
0.71587.5mW
750mA
0.333189mW
1000mA
0.250
250mW
RDS(ON) Current Limiting
The current limit threshold is setting by the internal circuit.
Compensation
Please refer the table of application circuit. For DC input, the option circuit for
compensation is connecting R4 and a 4148 diode to Vout. In order to protect short
circuit and thermal shutdown release for LED.
PCB layout guide
If you need low Tc & Tj or large PD (Power Dissipation), the dual SW pins (5&6) on the
SOP-8L package are internally connected to die pad, The PCB layout should allow for
maximum possible copper area at the SW pins of the AX2003/A.
6/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Feb.16, 2009
www.DataSheet.in

6 Page



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