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AX5104 Datasheet Preview

AX5104 Datasheet

Step-up PWM DC/DC Converter

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AX5104
Step-up PWM DC/DC Converter
GENERAL DESCRIPTION
The AX5104 is high efficient step-up DC/DC converter. Large output current is
possible having a built in internal transistor, and using an external coil and diode. The
converter can be operated at switching frequencies of 800KHz 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 AX5104 is external soft-start function that prevents inrush-current and
overshooting at startup, soft-start time is be set up by outside capacitance. An enable
function, current limit, over voltage protection (OVP) and thermal shutdown functions are
built inside.
FEATURES
- Input voltage: 4V to 23V
- Output voltage: 4.5V to 25V
- Duty ratio: 0% to 83% PWM control
- Maximum switch current is 1.8A
- Oscillation frequency: 800 KHz (typ.)
- Current limit and thermal shutdown functions
- External soft-start function
- Over voltage protection (OVP)
- Built-in internal Transistor
- SOP-8L with Expose-Pad (EP) Pb-Free Package.
1/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Aug.09, 2010




AXElite

AX5104 Datasheet Preview

AX5104 Datasheet

Step-up PWM DC/DC Converter

No Preview Available !

AX5104
BLOCK DIAGRAM
Vcc
FB
EN
SGND
Phase
Compensation
Regulator
+
-
Vref=1.0V
SCP
Comparator
VEN
PWM
Controller
Thermal
Shutdown
4uA
+
-
Oscillator
OVP
Comparator
Buffer
Driver
Current
Limit
SW
PGND
SS SENSE
PIN ASSIGNMENT
The package of AX5104 is SOP-8L-EP; the pin assignment is given by:
SW
VCC
EN
SGND
( Top View )
1 8 PGND
2
Exposed
7 SENSE
3
Pad (EP)
6 SS
4 5 FB
SOP-EP-8L
EP is connect to SGND
Name
SW
VCC
EN
FB
SS
SENSE
SGND
PGND
Description
Switch pin. Connect external
inductor & diode here.
IC power supply pin
Power-off pin
Hnormal operation(Step-up)
LStep-up operation stopped
Feedback pin
Soft-start pin, programming by
external capacitance
OVP detection pin, The OVP
voltage set by outside two
resistances.
Signal ground pin
Power ground pin
2/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Aug.09, 2010


Part Number AX5104
Description Step-up PWM DC/DC Converter
Maker AXElite
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AX5104 Datasheet PDF






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