AX3131 PDF даташит
Спецификация AX3131 изготовлена «Axelite» и имеет функцию, называемую «PWM Control 3A Step-Down Converter». |
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Детали детали
Номер произв | AX3131 |
Описание | PWM Control 3A Step-Down Converter |
Производители | Axelite |
логотип |
14 Pages
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AX3131
PWM Control 3A Step-Down Converter
GENERAL DESCRIPTION
AX3131 consists of step-down switching regulator with PWM control. These devise
include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and
etc.
AX3131 provides low-ripple power, high efficiency, and excellent transient
characteristics. The PWM control circuit is able to the duty ratio linearly form 0 up to 100%.
The converter frequency can be set by outside resistance. The wide range is from 200K to
1.3MHz. AX3131 is build out soft start function that prevent inrush current and overshooting.
A shutdown switch, over current protect and short circuit protect functions are built inside,
and when SCP happens, the operation frequency will be reduced to 150K. Also, an
external compensation block is built in to good stable system.
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 with
exposed pad 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 voltage 4.5V to 23V
- Output voltage VFB to VCC
- Duty ratio 0% to 100% PWM control
- Oscillation frequency 200K~1.3MHz (Outside resistance setting)
- Current Limit (CL), Short Current Protection (SCP)
- External Soft-Start function and Shutdown Function.
- Thermal Shutdown function.
- Built-in internal SW P-channel MOS.
- SOP-8L with exposed pad Pb-Free package.
1/14
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Aug.20, 2010
http://www.Datasheet4U.com
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AX3131
BLOCK DIAGRAM
VCC
EN
SW OSC
Current
Limit
Reference Voltage
6uA
PWM Switched
+
Control Circuit
-
VEN Thermal
Shutdown
COMP
FB
VSS
PIN ASSIGNMET
The package of AX3131 is SOP-8L-EP; the pin assignment is given by:
COMP 1
GND 2
EN/SS 3
VCC 4
( Top View )
Exposed
Pad
(SW)
SOP-8L-EP
8 FB
7 OSC
6 SW
5 SW
Name
FB
EN/SS
VCC
OSC
SW
GND
COMP
Description
Feedback pin
ON/OFF Shutdown and Soft-start
pin
IC power supply pin
Frequency Set Pin. The pin
connect a resistance to GND.
Switch pin. Connect external
inductor/diode here.
GND pin
Compensation pin
ORDER/MARKING INFORMATION
Order Information
AX3131 XX X
Package Type Packing
ES: SOP-8L-EP Blank : Tube
A : Taping
Top Marking
Logo
AX 3 1 3 1
YYWWX
Part number
ID code:internal
WW: 01~52
Year: 10=2010
11=2011
2/14
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Aug.20, 2010
http://www.Datasheet4U.com
No Preview Available ! |
AX3131
ABSOLUTE MAXIMUM RATINGS (at TA=25°C)
Characteristics
Symbol
Rating
VCC Pin Voltage
VCC VSS - 0.3 to VSS + 25
Feedback Pin Voltage
VFB VSS - 0.3 to 2.5
EN/SS Pin Voltage
VEN/SS
VSS - 0.3 to 6
Switch Pin Voltage
VSW VSS - 0.3 to VCC + 0.3
COMP Pin Voltage
VCOMP
VSS - 0.3 to 2.5
OSC Pin Voltage
VOSC VSS - 0.3 to 2.5
Power Dissipation
PD Internally limited
Storage Temperature Range
TST -65 to +165
Operating Junction Temperature
TOPJ -40 to +125
Junction Temperature Range
TJ -40 to +150
Thermal Resistance from Junction to case
θJC 15
Thermal Resistance from Junction to ambient
θJA
40
Note : JA is measured with the PCB copper area of approximately 1.5 in2(Multi-layer) to exposed pad.
Unit
V
V
V
V
V
V
mW
°C
°C
°C
°C/W
°C/W
ELECTRICAL CHARACTERISTICS (VIN = 12V, TA=25°C, unless otherwise specified)
Characteristics
Symbol
Conditions
Min Typ Max Units
Operating Supply Voltage
Feedback Voltage
Quiescent Current
Feedback Bias Current
Shutdown Supply Current
Line Regulation
Load Regulation
Current Limit
Adjustable Frequency Range
Short Circuit Frequency
EN/SS shutdown threshold
voltage
EN/SS pull high Current
Internal P-MOSFET RDSON
Thermal shutdown Temp
Thermal Shutdown Hysteresis
VCC 4.5 - 23 V
VFB IOUT=0.2A
0.588 0.600 0.612 V
ICCQ
VFB=1.2V force driver
off
-
3
5 mA
IFB IOUT=0.2A
- 0.1 0.5 uA
ISD VEN/SS =0V
VOUT/VOUT
VIN =4.5V~23V,
IOUT=0.1 A
VOUT/VOUT IOUT = 0.1 to 3A
- 150 200 uA
- 0.1 0.5 %
- 0.3 0.6 %
ILIM 3.5 - - A
FOSC-ADJ
200 - 1300 KHz
FOSC1 VFB=0V
- 150 - KHz
VSHL Regulator OFF
- - 0.4 V
IEN/SS
RDS-ON
TSD
TSH
VEN/SS=0V
VIN=5V, VFB=0V
VIN=12V, VFB=0V
- 6 - uA
-
-
90
60
-
-
mΩ
- 140 - °C
- 35 - °C
3/14
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Aug.20, 2010
http://www.Datasheet4U.com
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