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AX2001 の電気的特性と機能

AX2001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 AX2001
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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AX2001 Datasheet, AX2001 PDF,ピン配置, 機能
AX2001/A
1A, 0.25V Feedback Voltage Step-Down
Switching Regulators for LED Driver
GENERAL DESCRIPTION
AX2001/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.
AX2001/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 voltage4.5V to 23V
- Output voltage0.25V to VCC
- LED Backlight and High Power LED Application
- Duty ratio0% to 100% PWM control
- Oscillation frequency
AX2001: 330KHz typ.
AX2001A: 500KHz typ.
- Enable/Disable function.
- Current Limit (CL), Thermal Shutdown and Short Circuit Protections (SCP).
- Built-in internal SW P-channel MOS.
- No output capacitor is stable.
- SOP-8L Pb-Free package.
1/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Oct.21, 2011

1 Page





AX2001 pdf, ピン配列
AX2001/A
ABSOLUTE MAXIMUM RATINGS (at TA=25°C)
Characteristics
Symbol
VCC Pin Voltage
VCC
Feedback Pin Voltage
VFB
ON/OFF Pin Voltage
VEN
Switch Pin Voltage
VSW
Power Dissipation
PD
Storage Temperature Range
TST
Operating Temperature Range
Operating Supply Voltage
Thermal Resistance from Junction to case
TOP
VOP
θJC
Thermal Resistance from Junction to ambient
θJA
Rating
VSS - 0.3 to VSS + 25
VSS - 0.3 to VCC
VSS - 0.3 to VCC + 0.3
VSS - 0.3 to VCC + 0.3
Internally limited
-40 to +150
-40 to +125
+4.5 to +23
25
70
Unit
V
V
V
V
mW
°C
°C
V
°C/W
°C/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 Max Units
Feedback Voltage
Quiescent Current
Feedback Bias Current
Shutdown Supply Current
VFB IOUT=0.2A
0.24 0.25 0.26 V
ICCQ
VFB=1.2V force driver
off
3 5 mA
IFB IOUT=0.1A
- 0.1 0.5 uA
ISD VEN =0V
- 2 10 uA
Switch Current
Line Regulation
Load Regulation
ISW
VOUT/VOUT
VCC=5V~23V,
IOUT=0.2A
VOUT/VOUT IOUT = 0.1 to 1A
1.3 - -
- 12
- 0.2 0.5
A
%
%
Oscillation Frequency
FOSC
AX2001
AX2001A
260 330 400 KHz
400 500 600 KHz
EN Pin Logic input threshold
voltage
VSH
VSL
High (regulator ON)
Low (regulator OFF)
2.0
-
-
-
-
0.8
V
EN Pin Input Current
Internal MOSFET RDSON
ISH
ISL
RDSON
VEN=2.5V (ON)
VEN=0.3V (OFF)
VCC=5V, VFB=0V
VCC=12V, VFB=0V
- 20 - uA
- -10 - uA
-
-
160 220
120 180
m
Efficiency
EFFI
VOUT = 5V
IOUT = 0.5A
IOUT = 1A
-
-
91
91
-
-
%
Thermal shutdown Temp
TSD
- 140 - °C
3/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Oct.21, 2011


3Pages


AX2001 電子部品, 半導体
AX2001/A
Table 1 Resistor select for LED output current setting
ILED R2
350mA
0.715
87.5mW
750mA
0.333
189mW
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 and Tj or large PD (Power Dissipation), the dual SW pins (5 and 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 AX2001/A.
6/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Oct.21, 2011

6 Page



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