Datasheet
4A 180KHz 36V Buck DC to DC Converter
Features
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Wide 8V to 36V Input Voltage Range
Output Adjustable from 1.25V to 32V
Maximum Duty Cycle 100%
Minimum Drop Out 0.3V
Fixed 180KHz Switching Frequency
4A Constant Output Current Capability
Internal Optimize Power MOSFET
High efficiency
Excellent line and load regulation
Built in thermal shutdown function
Built in current limit function
Built in output short protection function
Available in TO-252 package
XL4013
General Description
The XL4013 is a 180 KHz fixed frequency
PWM buck (step-down) DC/DC converter,
capable of driving a 4A load with high
efficiency, low ripple and excellent line and
load regulation. Requiring a minimum
number of external components, the regulator
is simple to use and include internal
frequency
compensation
and
a
fixed-frequency oscillator.
The PWM control circuit is able to adjust the
duty ratio linearly from 0 to 100%. An over
current protection function is built inside.
When short protection function happens, the
operation frequency will be reduced from
180KHz to 48KHz. An internal compensation
block is built in to minimize external
component count.
Applications
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LCD Monitor and LCD TV
Portable instrument power supply
Telecom / Networking Equipment
Figure1. Package Type of XL4013
Rev 1.3
1
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Datasheet
4A 180KHz 36V Buck DC to DC Converter
Pin Configurations
XL4013
Figure2. Pin Configuration of XL4013 (Top View)
Table 1 Pin Description
Pin Number
1
Pin Name
GND
Description
Ground Pin. Care must be taken in layout. This pin should be
placed outside of the Schottky Diode to output capacitor
ground path to prevent switching current spikes from inducing
voltage noise into XL4013.
Feedback Pin (FB). Through an external resistor divider
network, FB senses the output voltage and regulates it. The
feedback threshold voltage is 1.25V.
Power Switch Output Pin (SW). SW is the switch node that
supplies power to the output.
Internal Voltage Regulator Bypass Capacity. In typical system
application, The VC pin connect a 1uf capacity to VIN.
Supply Voltage Input Pin. XL4013 operates from a 8V to 36V
DC voltage. Bypass Vin to GND with a suitably large
capacitor to eliminate noise on the input.
2
3
4
5
FB
SW
VC
VIN
Rev 1.3
2
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Datasheet
4A 180KHz 36V Buck DC to DC Converter
Function Block
XL4013
Figure3. Function Block Diagram of XL4013
Typical Application Circuit
Figure4. XL4013 Typical Application Circuit (VIN=8V~36V, VOUT=5V/4A)
Rev 1.3
3
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Datasheet
4A 180KHz 36V Buck DC to DC Converter
Ordering Information
Order Information
XL4013E1
Marking ID
XL4013E1
Package Type
TO252-5L
Packing Type Supplied As
2500 Units on Tape & Reel
XL4013
XLSEMI Pb-free products, as designated with
“E1”
suffix in the par number, are RoHS compliant.
Absolute Maximum Ratings（Note1）
Parameter
Input Voltage
Feedback Pin Voltage
Output Switch Pin Voltage
Power Dissipation
Thermal Resistance (TO252)
(Junction to Ambient, No Heatsink, Free Air)
Operating Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10 sec)
ESD (HBM)
Symbol
Vin
V
FB
V
Output
P
D
R
JA
T
J
T
STG
T
LEAD
Value
-0.3 to 40
-0.3 to Vin
-0.3 to Vin
Internally limited
50
-40 to 125
-65 to 150
260
>2000
Unit
V
V
V
mW
ºC/W
ºC
ºC
ºC
V
Note1:
Stresses greater than those listed under Maximum Ratings may cause permanent damage
to the device. This is a stress rating only and functional operation of the device at these or any
other conditions above those indicated in the operation is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect reliability.
Rev 1.3
4
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Datasheet
4A 180KHz 36V Buck DC to DC Converter
XL4013 Electrical Characteristics
T
a
= 25℃;unless otherwise specified.
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
XL4013
System parameters test circuit figure4
VFB
Efficiency
Efficiency
Feedback
Voltage
Vin = 8V to 36V, Vout=5V
Iload=0.5A to 4A
Vin=12V ,Vout=5V
Iout=4A
Vin=24V ,Vout=12V
Iout=3A
1.225
-
-
1.25
86
94
1.275
-
-
V
%
%
ŋ
ŋ
Electrical Characteristics (DC Parameters)
Vin = 12V, GND=0V, Vin & GND parallel connect a 100uf/50V capacitor; Iout=500mA, T
a
=
25℃; the others floating unless otherwise specified.
Parameters
Input operation voltage
Quiescent Supply Current
Oscillator Frequency
Output Short Frequency
Switch Current Limit
Max. Duty Cycle
Output Power PMOS
Symbol
Vin
I
q
Fosc
Fosp
I
L
D
MAX
Rdson
V
FB
=0
V
FB
=0V
V
FB
=0V, Vin=12V,
I
SW
=4A
V
FB
=Vin
144
Test Condition
Min.
8
2.1
180
48
7
100
60
80
Typ.
Max.
36
5
216
Unit
V
mA
KHz
KHz
A
%
mohm
Rev 1.3
5
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