Datasheet
5A 300KHz 32V Buck DC to DC Converter
XL4005
Features
General Description
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Wide 5V to 32V Input Voltage Range
Output Adjustable from 0.8V to 30V
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Maximum Duty Cycle 100%
Minimum Drop Out 0.6V
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Fixed 300KHz Switching Frequency
5A Constant Output Current Capability
Internal Optimize Power MOSFET
High efficiency
The XL4005 is a 300KHz fixed frequency
PWM buck (step-down) DC/DC converter,
capable of driving a 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.
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Excellent line and load regulation
TTL shutdown capability
EN pin with hysteresis function
The PWM control circuit is able to adjust the
duty ratio linearly from 0 to 100%. An enable
function, an over current protection function
is built inside. When short protection function
happens, the operation frequency will be
reduced from 300KHz to 60KHz. An internal
compensation block is built in to minimize
external component count.
Built in thermal shutdown function
Built in current limit function
Built in output short protection function
Available in TO-263 package
Applications
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LCD Monitor and LCD TV
Digital Photo Frame
Set-up Box
ADSL Modem
Telecom / Networking Equipment
Figure1. Package Type of XL4005
Rev 2.1
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1
Datasheet
5A 300KHz 32V Buck DC to DC Converter
XL4005
Pin Configurations
Figure2. Pin Configuration of XL4005 (Top View)
Table 1 Pin Description
Pin Number
Pin Name
1
GND
2
FB
3
SW
4
EN
5
VIN
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 XL4005.
Feedback Pin (FB). Through an external resistor divider
network, FB senses the output voltage and regulates it. The
feedback threshold voltage is 0.8V.
Power Switch Output Pin (SW). SW is the switch node that
supplies power to the output.
Enable Pin. Drive EN pin high to turn on the device, drive it
low to turn it off.
Supply Voltage Input Pin. XL4005 operates from a 5V to 32V
DC voltage. Bypass Vin to GND with a suitably large
capacitor to eliminate noise on the input.
Rev 2.1
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2
Datasheet
5A 300KHz 32V Buck DC to DC Converter
XL4005
Function Block
Figure3. Function Block Diagram of XL4005
Typical Application Circuit
CFF 33n
R1
2K
VIN
R2
10.5K
FB
2
5
XL4005
4
EN
3
L 33uh/5A
SW
VOUT 5V/5A
1
GND
+24V
D1 1N5824
CIN
C1
470uf/50V 105
COUT
LOAD
470uf/50V
24V ~ 5V/5A
VOUT=0.8*(1+R2/R1)
Figure4. XL4005 Typical Application Circuit 24V~5V/5A
Rev 2.1
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Datasheet
5A 300KHz 32V Buck DC to DC Converter
XL4005
Ordering Information
Order Information
XL4005E1
Marking ID
XL4005E1
Package Type
TO263-5L
Packing Type Supplied As
800 Units on Tape & Reel
XLSEMI Pb-free products, as designated with “E1” suffix in the par number, are RoHS compliant.
Absolute Maximum Ratings(Note1)
Parameter
Symbol
Vin
VFB
VEN
VOutput
PD
Value
-0.3 to 35
-0.3 to Vin
-0.3 to Vin
-0.3 to Vin
Internally limited
Unit
V
V
V
V
mW
Input Voltage
Feedback Pin Voltage
EN Pin Voltage
Output Switch Pin Voltage
Power Dissipation
Thermal Resistance (TO263)
(Junction to Ambient, No Heatsink, Free Air)
Operating Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10 sec)
ESD (HBM)
RJA
30
ºC/W
TJ
TSTG
TLEAD
-40 to 125
-65 to 150
260
2000
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 2.1
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Datasheet
5A 300KHz 32V Buck DC to DC Converter
XL4005
XL4005 Electrical Characteristics
Ta = 25℃;unless otherwise specified.
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
0.776
0.8
0.824
V
-
90
-
%
System parameters test circuit figure4
Feedback
Voltage
VFB
Efficiency
ŋ
Vin = 5V to 32V, Vout=5V
Iload=0.5A to 5A
Vin=12V ,Vout=5V
Iout=5A
Electrical Characteristics (DC Parameters)
Vin = 12V, GND=0V, Vin & GND parallel connect a 220uf/50V capacitor; Iout=500mA, Ta =
25℃; the others floating unless otherwise specified.
Parameters
Symbol
Test Condition
Min.
Typ.
5
Max.
Unit
32
V
Input operation voltage
Vin
Shutdown Supply Current
ISTBY
VEN=0V
60
200
uA
Quiescent Supply Current
Iq
VEN =2V,
VFB =Vin
3
5
mA
300
360
Khz
Oscillator Frequency
Fosc
Switch Current Limit
IL
VFB =0
8
A
VEN
High (Regulator ON)
Low (Regulator OFF)
1.4
0.8
V
IH
VEN =2V (ON)
1
15
uA
IL
VEN =0V (OFF)
1
15
uA
DMAX
VFB=0V
100
EN Pin Threshold
EN Pin Input Leakage
Current
Max. Duty Cycle
240
Rev 2.1
%
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Datasheet
5A 300KHz 32V Buck DC to DC Converter
XL4005
Test Circuit and Layout guidelines
Figure5. Standard Test Circuits and Layout Guides
Select R1 to be approximately 2K, use a 1% resistor for best stability.
C1 and CFF are optional; in order to increase stability and reduce the input power line noise, CIN
and C1 must be placed near to VIN and GND;
For output voltages greater than approximately 10V, an additional capacitor CFF is required. The
compensation capacitor is typically between 100 pf and 33 nf, and is wired in parallel with the
output voltage setting resistor, R2. It provides additional stability for high output voltage, low
input-output voltages, and/or very low ESR output capacitors, such as solid tantalum capacitors.
CFF=1/(31*1000*R2); This capacitor type can be ceramic, plastic, silver mica, etc. (Because of
the unstable characteristics of ceramic capacitors made with Z5U material, they are not
recommended.)
Rev 2.1
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Datasheet
5A 300KHz 32V Buck DC to DC Converter
XL4005
Schottky Diode Selection Table
Current
1A
3A
Surface Through VR (The same as system maximum input voltage)
Mount Hole
20V
30V
40V
50V
1N5817
1N5818
1N5819
√
√
1N5820
1N5821
1N5822
√
MBR320
MBR330
MBR340 MBR350
MBR360
SK32
SK33
SK34
SK36
30WQ03
30WQ04 30WQ05
31DQ03
31DQ04
31DQ05
SR305
SR306
√
√
√
5A
√
60V
SK35
√
SR302
SR303
SR304
√
1N5823
1N5824
1N5825
√
SR502
SR503
SR504
SR505
SR506
√
SB520
SB530
SB540
SB550
SB560
50WQ03
50WQ04 50WQ05
Rev 2.1
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Datasheet
5A 300KHz 32V Buck DC to DC Converter
XL4005
Typical System Application for 24V ~ 12V/4A Version
CFF 33n
R1
2K
VIN
R2
28K
FB
2
XL4005
5
4
3
1
EN
+24V
CIN
470uf/50V
L 33uh/4A
SW
VOUT 12V/4A
GND
C1
105
D1 1N5824
COUT
LOAD
470uf/50V
24V ~ 12V/4A
VOUT=0.8*(1+R2/R1)
Figure6. XL4005 System Parameters Test Circuit (24V ~ 12V/4A)
Typical System Application for 24V ~ 5V/5A
CFF 33n
R1
2K
VIN
R2
10.5K
FB
2
5
XL4005
4
EN
3
L 33uh/5A
SW
VOUT 5V/5A
1
GND
+24V
D1 1N5824
CIN
C1
470uf/50V 105
COUT
LOAD
470uf/50V
24V ~ 5V/5A
VOUT=0.8*(1+R2/R1)
Figure7. XL4005 System Parameters Test Circuit (24V ~ 5V/5A)
Rev 2.1
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Datasheet
5A 300KHz 32V Buck DC to DC Converter
XL4005
Package Information
TO263-5L
Rev 2.1
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