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GA8522 Datasheet Preview

GA8522 Datasheet

2A Step-Down DC-DC Converter

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GA8522 pdf
Linear Artwork
GA8522
300KHz, 2A Step-Down DC-DC Converter
v General Description
The GA8522 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. This
device includes a reference voltage source, error
amplifier, oscillation circuit, P-channel MOSFET,
and etc.
The input voltage range of GA8522 is from
3.6V to 23V, and provides adjustable output
voltage range from 0.8V to VIN for customers in
application.
The GA8522 provides an enable function that
can be controlled by external logic signal and
excellent regulation during line or load transient
due to the internal compensation. Other features
of thermal protection, current limit and short
circuit protection are also included. Due to the
low Drain-Source resistance of internal power
MOSFET, the GA8522 provides a high efficiency
step-down application. It can also operate with a
maximum duty cycle of 100% for use in low
drop-out conditions.
The package is available in a standard
SOP-8L.
v Features
Adjustable Output Voltage from 0.8V to VIN
Operating Input Voltage up to 23V
Great Output Capability: 2A
Oscillation Frequency: 300KHz
Built-in P-channel MOSFET
External ON/OFF Control Function
Low Shutdown Current: 1uA
Current Limit and Thermal Protection
Short Circuit Protection
Stable With Low ESR Output Ceramic Capacitor
SOP-8L Package
All Products meet Rohs Standard
v Applications
Broadband Communication Device
LCD TV / Monitor
Storage Device
Wireless Application
v Typical Application
VIN
CIN
GA8522
IN SW
4
EN
2
FB
OCSET GND
ROCSET
3 7,8
5,6
1
L1
D1
VOUT
R1
COUT
R2
GA8522-B01
* VOUT = VFB x ( 1 + R1 / R2 )
© Linear Artwork, Inc.
www.linear-artwork.com
-1-
Apr. 01, 2008



Linear Artwork
Linear Artwork

GA8522 Datasheet Preview

GA8522 Datasheet

2A Step-Down DC-DC Converter

No Preview Available !

GA8522 pdf
Linear Artwork
GA8522
300KHz, 2A Step-Down DC-DC Converter
v Functional Block Diagram
SW
IN
Thermal
Shutdown
300KHz
OSC
0.8V Reference Voltage
PWM-Switched
Control Circuit
+
-
VON/OFF
90uA
FB
GND
EN
v Pin Configurations
OCSET
FB
EN
OCSET
IN
SOP-8L
GND
GND
SW
SW
Pin No.
1
2
3
4
5,6
7,8
Name Description
FB
This pin senses the feedback voltage to regulate the output voltage. Connect
this pin to a resistor divider to set the output voltage.
This pin allows an external logic control signal to turn-on/off this device. Float
EN
this pin or drive it to low level to turn-off this device, drive it to high level to
turn-on this device. If this feature is not needed, connect this pin to IN pin
directly.
OCSET Add an external resistor from this pin to IN pin to set peak current.
The input pin of the step-down converter.
IN 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.
SW 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.
GND
The ground pin of the step-down converter.
Connect this pin to the circuit ground.
GA8522-B01
© Linear Artwork, Inc.
www.linear-artwork.com
-2-
Apr. 01, 2008


Part Number GA8522
Description 2A Step-Down DC-DC Converter
Maker Linear Artwork
Total Page 20 Pages
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