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AX5203 Datasheet Preview

AX5203 Datasheet

Step-up PWM DC/DC Converter

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AX5203
Step-up PWM DC/DC Converter
GENERAL DESCRIPTION
The AX5203 is high efficient step-up DC/DC converter. Large output current is
possible having a built in internal N channel MOSFET, and using an external coil and
diode.
The AX5203 can be operated at switching frequencies of 500 kHz allowing for easy
filtering and low noise, the size of the external components can be reduced.
Output voltage is programmable with 1.0V of standard voltage supply internal, and
using externally connected components, output voltage (FB) can be set up at will. The
soft-start time can be programmed by outside capacitor; the function prevents overshoot at
startup. Build inside Current limit, Thermal Shutdown and enable functions.
FEATURES
- Input voltage4.5V to 23V
- Output voltage5 V to 68V
- Duty ratio0% to 85% PWM control
- Oscillation frequency500KHz.
- Enable and Thermal Shutdown function.
- Internal Current limit.
- Built-in N-channel MOSFET
- SOP-8L with Exposed pad Pb-Free package.
BLOCK DIAGRAM
Vcc
Phase
FB
Compensation
Regulator
+
-
Vref=1.0V
PWM
Controller
+
-
Oscillator
Buffer
Driver
EN
VEN
8uA
Thermal
Shutdown
0.06V
SW
SS
SGND
PGND
1/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Jan.25, 2011




AXElite

AX5203 Datasheet Preview

AX5203 Datasheet

Step-up PWM DC/DC Converter

No Preview Available !

AX5203
PIN ASSIGNMET
The package of AX5203 is SOP-8L-EP; the pin assignment is given by:
Name
Description
( Top View )
SGND Signal Ground pin.
EN 1
VCC 2
FB 3
SS 4
Exposed
pad
8 SGND
7 PGND
6 SW
5 SW
PGND
EN
VCC
FB
Power Ground pin
Power-off pin
Hnormal operation(Step-up)
LStep-up operation stopped
IC power supply pin
Feedback pin
SOP-8L-EP
(EP is connect to SW)
SW
Switch pin. Connect external
inductor & diode here.
SS Soft-Start Pin.
ORDER/MARKING INFORMATION
Order Information
AX5203 XX X
Package Type Packing
ES: SOP-8L-EP Blank : Tube
A : Taping
Top Marking
Logo
AX 5 2 0 3
YYWWX
Part number
ID code:internal
WW: 01~52
Year: 10=2010
11=2011
ABSOLUTE MAXIMUM RATINGS (at TA=25°C)
Characteristics
Symbol
Rating
Unit
VCC Pin Voltage
VCC GND - 0.3 to GND + 25 V
Feedback Pin Voltage
VFB
GND - 0.3 to 6
V
ON/OFF Pin Voltage
VEN
GND - 0.3 to VCC
V
Switch Pin Voltage
VSW GND - 0.3 to 70 V
SS Pin Voltage
VSS
GND - 0.3 to 6
V
Power Dissipation
PD Internally limited mW
Storage Temperature Range
TST
-40 to +150
°C
Operating Junction Temperature
TOPJ
-20 to +125
°C
Thermal Resistance from Junction to case
θJC
15 °C/W
Thermal Resistance from Junction to ambient
θJA
40 °C/W
Note: θJA is measured with the PCB copper area of approximately 1 in2(Multi-layer).
2/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Jan.25, 2011


Part Number AX5203
Description Step-up PWM DC/DC Converter
Maker AXElite
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