Datasheet
3A 180KHz 36V Buck DC to DC Converter With CV/CC Loop
Features
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XL2009
General Description
The XL2009 is a 180 KHz fixed frequency
PWM buck (step-down) DC/DC converter,
capable of driving a 2.5A 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.
Wide 8V to 36V Input Voltage Range
Output Adjustable from 1.25V to 32V
Maximum Duty Cycle 100%
Minimum Drop Out 0.3V
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Fixed 180KHz Switching Frequency
Maximum 3A Switching Current
Internal Optimize Power MOSFET
High e
fficiency
Excellent line and load regulation
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With output constant current loop
Built in thermal shutdown function
Built in current limit function
Built in output short protection function
Available in SOP8L package
Applications
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Car Charger
Battery Charger
LCD Monitor and LCD TV
Portable instrument power supply
Telecom / Networking Equipment
Figure1. Package Type of XL2009
Rev 1.1
1
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Datasheet
3A 180KHz 36V Buck DC to DC Converter With CV/CC Loop
Pin Configurations
XL2009
Figure2. Pin Configuration of XL2009 (Top View)
Table 1 Pin Description
Pin Number
1
2
3
4
5,6
7,8
Pin Name
FB
OCSET
VC
VIN
SW
GND
Description
Feedback Pin (FB). Through an external resistor divider
network, FB senses the output voltage and regulates it. The
feedback threshold voltage is 1.25V.
Output Constant Current Set Pin;
Internal Voltage Regulator Bypass Capacity. In typical system
application, The VC pin connect a 1uf capacity to VIN.
Supply Voltage Input Pin. XL2009 operates from a 8V to 36V
DC voltage. Bypass Vin to GND with a suitably large
capacitor to eliminate noise on the input.
Power Switch Output Pin (SW). SW is the switch node that
supplies power to the output.
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 XL2009.
Rev 1.1
2
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Datasheet
3A 180KHz 36V Buck DC to DC Converter With CV/CC Loop
Function Block
XL2009
Figure3. Function Block Diagram of XL2009
Typical Application Circuit
Figure4. XL2009 Typical Application Circuit (VIN=8V~36V, VOUT=5V/2.1A)
Rev 1.1
3
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Datasheet
3A 180KHz 36V Buck DC to DC Converter With CV/CC Loop
Ordering Information
Temperature
Range
Part Number
Lead Free
XL2009E1
Marking ID
Lead Free
XL2009E1
Packing Type
2500 Units on Tape & Reel
XL2009
Package
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 (SOP8L)
(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
100
-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 1.1
4
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Datasheet
3A 180KHz 36V Buck DC to DC Converter With CV/CC Loop
XL2009 Electrical Characteristics
T
a
= 25℃;unless otherwise specified.
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
XL2009
System parameters test circuit figure4
VFB
Efficiency
Feedback
Voltage
Vin = 8V to 36V, Vout=5V
Iload=0.5A to 2.5A
Vin=12V ,Vout=5V
Iout=2.1A
1.225
-
1.25
89
1.275
-
V
%
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
=3A
V
FB
=Vin
144
Test Condition
Min.
8
2.1
180
48
4
100
60
80
Typ.
Max.
36
5
216
Unit
V
mA
KHz
KHz
A
%
mohm
Rev 1.1
5
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