Datasheet
2A 150kHz 40V Buck DC/DC Converter With Constant Current Loop
Features
Wide 4.5V to 40V Input Voltage Range
Output Adjustable from 1.235V to 37V
Minimum Drop Out 1.5V
XL4001
General Description
The XL4001 is a 150KHz fixed frequency
PWM buck (step-down) DC/DC converter,
capable of driving a 2A 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 enable
function, an over current protection function
is built inside. An internal compensation
block is built in to minimize external
component count.
Fixed 150kHz Switching Frequency
2A Constant Output Current Capability
Internal Optimize Power Transistor
Excellent line and load regulation
TTL shutdown capability
ON/OFF pin with hysteresis function
With output constant current loop
Built in thermal shutdown function
Built in current limit function
Built in output over voltage protection
SOP8-EP (Exposed PAD) package
Applications
Car Charger
Battery Charger
LED Constant Current Driver
Figure1. Package Type of XL4001
Rev 1.2
1
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Datasheet
2A 150kHz 40V Buck DC/DC Converter With Constant Current Loop
Pin Configurations
XL4001
SW
SW
GND
FB
1
2
XL4001
3
4
8
7
6
5
VIN
VIN
EN
CS
Figure2. Pin Configuration of XL4001 (Top View)
Table 1 Pin Description
Pin Number
1,2
3
4
5
6
7,8
Pin Name
SW
GND
FB
CS
EN
VIN
Description
Power Switch Output Pin (SW). Output is the switch node that
supplies power to the output.
Ground Pin.(Note:
Connected the back exposed PAD to Pin3.)
Feedback Pin (FB). Through an external resistor divider
network, Feedback senses the output voltage and regulates it.
The feedback threshold voltage is 1.235V.
Output Current Sense Pin; (Iload=0.155V/Rcs)
Enable Pin. Drive EN pin low to turn on the device, drive it high
to turn it off. Floating is default low.
Supply Voltage Input Pin. XL4001 operates from a 4.5V to 40V
DC voltage. Bypass Vin to GND with a suitably large capacitor
to eliminate noise on the input.
Rev 1.2
2
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Datasheet
2A 150kHz 40V Buck DC/DC Converter With Constant Current Loop
Function Block
XL4001
Figure3. Function Block Diagram of XL4001
Typical Application Circuit (Car Charger)
Figure4. XL4001 Typical Application Circuit (Li Battery Charger)
Rev 1.2
3
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Datasheet
2A 150kHz 40V Buck DC/DC Converter With Constant Current Loop
Typical Application Circuit (Buck LED Constant Current Driver)
EN
FB
VIN
4
6
7,8
XL4001
1,2 SW
3
5
GND
CS
VOUT
R2
LED 1W~5W
L 33uh
XL4001
D1 1N5821
COUT
100uf/35V
+6V~36V
CIN
100uf/50V
C1
105
R1 1K
Rcs
Figure5. XL4001 Typical Application Circuit (LED Constant Current Driver)
Ordering Information
Order Information
XL4001E1
Marking ID
XL4001E1
Package Type
SOP8-EP
Packing Type Supplied As
2500 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
Input Voltage
Vin
FB Pin Voltage
V
FB
EN Pin Voltage
VEN
SW Pin Voltage
V
SW
Power Dissipation
P
D
Thermal Resistance
60
ºC/W
R
JA
(Junction to Ambient, No Heatsink, Free Air)
Operating Junction Temperature
-40 to 125
ºC
T
J
-65 to 150
ºC
Storage Temperature
T
STG
Lead Temperature (Soldering, 10 sec)
260
ºC
T
LEAD
ESD (HBM)
2000
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.
Value
-0.3 to 45
-0.3 to Vin
-0.3 to Vin
-0.3 to Vin
Internally limited
Unit
V
V
V
V
mW
Rev 1.2
4
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Datasheet
2A 150kHz 40V Buck DC/DC Converter With Constant Current Loop
XL4001 Electrical Characteristics
T
a
= 25℃;unless otherwise specified.
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
XL4001
System parameters test circuit figure4
VFB
Efficiency
Feedback
Voltage
Vin = 8V to 32V, Vout=5V
Iload=0.2A to 2A
Vin=12V ,Vout=5V
Iout=2A
1.21
-
1.235
83
1.26
-
V
%
ŋ
Electrical Characteristics (DC Parameters)
Vin = 12V, GND=0V, Vin & GND parallel connect a 220uf/50V capacitor; Iout=500mA, T
a
=
25℃; the others floating unless otherwise specified.
Parameters
Input operation voltage
Shutdown Supply Current
Quiescent Supply Current
Oscillator Frequency
Switch Current Limit
EN Pin Threshold
Output Saturation Voltage
Constant
Voltage
current
sense
Symbol
Vin
I
STBY
I
q
Fosc
I
L
V
EN
V
CE
V
CS
V
FB
=0
High (Regulator OFF)
Low (Regulator ON)
V
FB
=0V
I
SW
=2A
V
EN
=5V
V
EN
=0V,
V
FB
=Vin
127
Test Condition
Min.
4.5
80
2
150
3
1.4
0.8
1.1
1.4
Typ.
Max.
40
200
5
172
Unit
V
uA
mA
Khz
A
V
V
V
0.140 0.155 0.170
Rev 1.2
5
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