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PDF LA8522A Data sheet ( Hoja de datos )
| Número de pieza | LA8522A | |
| Descripción | Step Down DC-DC Converter | |
| Fabricantes | INNO-TECH | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LA8522A (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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General Description
LA8522A
300KHz, 2A/23V Step-Down DC-DC Converter
Features
LA8522A is a voltage mode, step-down DC-DC
converter that is designed to meet 2A output
current, and utilizes PWM control scheme that
switches with 300KHz fixed frequency.
The input voltage range of LA8522A is from
3.6V to 23V, and available in adjustable output
voltage from 0.8V to VIN. The supply current is
only 3mA during operation and under 1uA in
shutdown.
This device provides an enable function that
can be controlled by external logic signal. It
also provides excellent regulation during line
or load transient. Other features of current
limit, thermal shutdown protection, and short
circuit protection are also included. Due to the
low RDS(ON) of the internal power MOSFET, this
device provides high efficiency step-down
applications. It can also operate with a
maximum duty cycle of 100% for use in low
drop-out conditions. The package is available
in standard SOP-8.
l Adjustable Output Voltage from 0.8V to VIN
l 3.6V to 23V Input Voltage Range
l Continuous 2A Output Capability
l 300KHz Oscillation Frequency
l 0.8V Reference Voltage
l 1uA Low Shutdown Current
l 3mA Low Supply Current
l 100% Duty Cycle
l Built-in Low RDS(ON) Power MOSFET
l No External Compensation Required
l Support Low ESR Output Ceramic Capacitors
l Adjustable Current Limit
l Short Circuit and Thermal Protection
l SOP-8 Package
l Meet RoHS Standard
Applications
l Broadband Communication Device
l LCD TV / Monitor
l Storage Device
l Wireless Application
Ordering Information
LA8522A 1 2 3 4
1 (Package Type) => J: SOP
2 (Number of Pins) => G: 8 pin
3 (Output Voltage) => Blank: Adjustable
4 (Special Feature) => Blank: N/A
Available Part Number
LA8522AJG
Marking Information
LA8522AJG
1234
1 2 (Date Code)
For date code rule, please contact our sales
representative directly.
3 4 (Internal Code)
Rev01
-1-
Mar. 07, 2013
www.inno.com.tw
FreeDatasheethttp://www.0PDF.com
1 page  
Functional Block Diagram
SW
IN
Thermal
Shutdown
LA8522A
300KHz
OSC
0.8V Reference Voltage
PWM-Switched
Control Circuit
+
-
FB
VON/OFF
90uA
GND
Pin Configurations
EN
OCSET
FB
EN
OCSET
IN
SOP-8
GND
GND
SW
SW
Pin No.
1
2
3
4
5,6
7,8
Name
FB
EN
OCSET
Description
This pin senses the feedback voltage to regulate the output voltage.
Connect this pin to a voltage divider to set the output voltage.
This pin allows an external control signal to turn-on/off this device. Float this
pin or force it below 0.8V to turn-off this device, force it above 2V to turn-on
this device. If this feature is not needed, connect this pin to IN directly.
Add an external resistor from this pin to IN to set current Limit.
IN
SW
GND
The input pin of the step-down converter.
A suitably large capacitor must be connected from this pin to ground to
bypass noise on the input of the IC.
The output pin of the step-down converter.
This pin is the switching node that supplies power to the output. Connect a
LC filter from this pin to the output load and a rectifier diode to the ground.
The ground pin of the step-down converter.
Connect this pin to the circuit ground.
Rev01
-5-
Mar. 07, 2013
www.inno.com.tw
FreeDatasheethttp://www.0PDF.com
5 Page 
LA8522A
There are many factors affect the thermal resistance. Some of these factors include trace width,
copper thickness, total PCB copper area, and etc. For the best thermal performance, wide copper
traces and generous amounts of PCB copper should be used in the board layout. If further improve
thermal characteristics are needed, double sided and multi-layer PCB with large copper areas and
airflow will be recommended.
Layout Considerations
PC board layout is very important, especially for switching regulators of high frequencies and large
peak currents. A good layout minimizes EMI on the feedback path and provides best efficiency.
The following layout guides should be used to ensure proper operation of this device.
(1) The power charge path that consists of the IN trace, the SW trace, the external inductor and
the GND trace should be kept wide and as short as possible.
(2) The power discharge path that consists of the SW trace, the external inductor, the rectifier
diode and the GND trace should be kept wide and as short as possible.
(3) The feedback path of voltage divider should be close to the FB pin and keep noisy traces away;
also keep them separate using grounded copper.
(4) The input capacitors should be close to the regulator and rectifier diode.
(5) The output capacitors should be close to the load.
Rev01
- 11 -
Mar. 07, 2013
www.inno.com.tw
FreeDatasheethttp://www.0PDF.com
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet LA8522A.PDF ] | |
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