Datasheet
0.3A 100KHz 100V Buck DC to DC Converter
XL7045
Features
General Description

Maximum Input Voltage 100V
The XL7045 is a 100KHz fixed frequency

Output Adjustable from 1.25V to 20V
PWM buck (step-down) DC/DC converter,

Maximum Duty Cycle 100%
capable of driving a 0.3A load with high

Minimum Drop Out 1V
efficiency, low ripple and excellent line and

Fixed 100KHz Switching Frequency
load

Max. IOUT=0.3A at VOUT=5V
number

Max. IOUT=0.2A at VOUT=12V or 15V
regulator is simple to use and include

Internal Optimize HV Power Transistor
internal frequency compensation and a

High efficiency up to 84%
fixed-frequency oscillator.

Excellent line and load regulation

Built in thermal shutdown function
The PWM control circuit is able to adjust the

Built in current limit function
duty ratio linearly from 0 to 100%. An enable

Built in output short Protection Function
function, an over current protection function

SOP8-EP (Exposed PAD) package
is built inside. When output short protection
regulation.
of
Requiring
external
a
minimum
components,
the
function happens, the operation frequency
will be reduced from 100KHz to 15KHz. An
internal compensation block is built in to
minimize external component count.
Applications

Ebike Controller Power Supply

Telecom / Networking Equipment
Figure1. Package Type of XL7045
Rev 1.5
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Datasheet
0.3A 100KHz 100V Buck DC to DC Converter
XL7045
Pin Configurations
VIN
1
SW
2
8
NC
7
NC
The Exposed PAD is GND
XL7045
FB
3
6
CSN
GND
4
5
CSP
Figure2. Pin Configuration of XL7045
Table 1 Pin Description
Pin Number
Pin Name
1
VIN
2
SW
Description
Supply Voltage Input Pin. Bypass Vin to GND with a suitably
large capacitor to eliminate noise on the input.
Power Switch Output Pin (SW). Output is the switch node that
supplies power to the output.
Feedback Pin (FB). Through an external resistor divider
3
FB
network, Feedback senses the output voltage and regulates it.
The feedback threshold voltage is 1.25V.
Ground Pin. Care must be taken in layout. This pin should be
4
GND
placed outside of the Schottky Diode to output capacitor
ground path to prevent switching current spikes from inducing
voltage noise into XL7045. The exposed PAD is GND.
5
CSP
Current Sense Positive Terminal Pin.
6
CSN
Current Sense Negative Terminal Pin.
7~8
NC
No Connected.
Rev 1.5
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Datasheet
0.3A 100KHz 100V Buck DC to DC Converter
XL7045
Function Block
VIN
100mV
100mV
1.25V
Start Up
UVLO
Bias current &
Voltage Reference
160mΩ
COMP
Current Limit
EA
EA
COMP
RS Latch and Driver
FB
Switch
CSN
SW
Oscillator
100/15KHz
OSC
CSP
GND
Figure3. Function Block Diagram of XL7045
Typical Application Circuit
CSN
VIN
1 6
CSP
5
2
SW
D1
S210
XL7045
VIN
CIN
33uF
/100V
C1
104
3
4
L1
100uH/0.5A
FB
R3
0.15Ω 1%
C2
105
COUT
100uF
/35V
GND
R2
30K
1%
CFF
33nF
VOUT
15V/0.2A
R1
2.7K
1%
OUTPUT 15V/0.2A
VOUT=1.25*(1+R2/R1)
Figure4. XL7045 Typical Application Circuit
Rev 1.5
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Datasheet
0.3A 100KHz 100V Buck DC to DC Converter
XL7045
Ordering Information
Order Information
Marking ID
Package Type
Packing Type Supplied As
XL7045E1
XL7045E1
SOP8-EP
2500/4000 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
Value
Unit
Input Voltage
Vin
-0.3 to 100
V
Feedback Pin Voltage
VFB
-0.3 to Vin
V
Output Switch Pin Voltage
VSW
-0.3 to Vin
V
CSP Pin Voltage
VCSP
-0.3 to 20
V
CSN Pin Voltage
VCSN
-0.3 to 20
V
PD
Internally limited
mW
RJA
60
TJ
-40 to 150
o
C
TJ
-40 to 125
o
C
TSTG
-65 to 150
o
C
260
o
C
Power Dissipation
Thermal Resistance (SOP8-EP)
(Junction to Ambient, No Heatsink, Free Air)
Maximum Junction Temperature
Operating Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10 sec)
TLEAD
o
C/W
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 1.5
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Datasheet
0.3A 100KHz 100V Buck DC to DC Converter
XL7045
XL7045 Electrical Characteristics
Ta = 25℃;unless otherwise specified.
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
1.225
1.25
1.275
V
-
84
-
%
-
81
-
%
-
77
-
%
System parameters test circuit figure4
VFB
FB Voltage
η
Efficiency
η
Efficiency
η
Efficiency
Vin =20V to 80V, Vout=15V
Iload=0.1A to 0.2A
Vin=36V ,Vout=15V
Iout=0.2A
Vin=48V ,Vout=15V
Iout=0.2A
Vin=60V ,Vout=15V
Iout=0.2A
Electrical Characteristics (DC Parameters)
Vin = 48V, GND=0V, Vin & GND parallel connect a 33uf/100V capacitor; Iout=0.2A, Ta = 25℃;
the others floating unless otherwise specified.
Parameters
Input operation voltage
VIN UVLO
Quiescent Supply Current
Symbol
Test Condition
Vin
Min.
Iq
Fosc
Switch Current Limit
IL
Output Saturation Voltage
VCE
Max. Duty Cycle
DMAX
Max.
Unit
80
V
8
9
V
2.8
5
mA
100
125
KHz
10
Vin_uvlo
Oscillator Frequency
Typ.
VFB=2V
75
VFB=0V
R3=0.15Ω
VFB=0V
ISW=0.3A
VFB=0V
Rev 1.5
0.35
A
0.84
V
100
%
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Datasheet
0.3A 100KHz 100V Buck DC to DC Converter
XL7045
Typical Performance Characteristics
Quiescent Supply Current VS Temperature
Quiescent Supply Current(mA)
5
4
VIN=48V
3
2
1
0
-50
-25
0
25
50
75
100
125
Temperature(℃)
Figure5. Quiescent Current Curve
Feedback Voltage Change VS Temperature
3.0
Feedback Voltage Change(%)
2.5
2.0
VIN=48V,VOUT=5V,IOUT=0.1A
Normalized at TA=25℃
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
-50
-25
0
25
50
75
100
125
Temperature(℃)
Figure6. Feedback Voltage Curve
Rev 1.5
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Datasheet
0.3A 100KHz 100V Buck DC to DC Converter
XL7045
Typical System Application(VOUT=15V/0.2A)
CSN
VIN
1 6
CSP
5
2
SW
CIN
33uF
/100V
R3
0.15Ω 1%
D1
S210
XL7045
VIN
20V~80V
L1
100uH/0.5A
C1
104
3
4
C2
105
FB
COUT
100uF/35V
GND
R2
30K
1%
CFF
33nF
VOUT
15V/0.2A
R1
2.7K
1%
INPUT 20V~80V
OUTPUT 15V/0.2A
VOUT=1.25*(1+R2/R1)
Figure7. XL7045 System Application (VIN=20V~80V, VOUT=15V/0.2A)
Efficiency VS Output current
90
85
80
75
70
Efficiency(%)
65
60
55
50
45
40
35
30
VIN=24V,VOUT=15V,IOUT=0.05A~0.2A
VIN=36V,VOUT=15V,IOUT=0.05A~0.2A
VIN=48V,VOUT=15V,IOUT=0.05A~0.2A
VIN=60V,VOUT=15V,IOUT=0.05A~0.2A
VIN=72V,VOUT=15V,IOUT=0.05A~0.2A
25
20
0.05
0.10
0.15
0.20
Output current(A)
Figure8. XL7045 System Application (Efficiency VS Output Current)
Rev 1.5
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Datasheet
0.3A 100KHz 100V Buck DC to DC Converter
XL7045
Typical System Application(VOUT=5V/0.3A)
CSN
VIN
CSP
1 6
5
2
SW
D1
S210
XL7045
CIN
33uF
/100V
VIN
10V~80V
L1
100uH/0.5A
C1
104
3
4
R3
0.15Ω 1%
C2
105
FB
COUT
100uF
/35V
GND
R2
10K
1%
CFF
33nF
VOUT
5V/0.3A
R1
3.3K
1%
INPUT 10V~80V
OUTPUT 5V/0.3A
VOUT=1.25*(1+R2/R1)
Figure9. XL7045 System Application (VIN=10V~80V, VOUT=5V/0.3A)
Efficiency VS Output current
90
85
80
75
70
Efficiency(%)
65
60
55
50
VIN=12V,VOUT=5V,IOUT=0.05A~0.25A
VIN=24V,VOUT=5V,IOUT=0.05A~0.25A
VIN=36V,VOUT=5V,IOUT=0.05A~0.25A
VIN=48V,VOUT=5V,IOUT=0.05A~0.3A
VIN=60V,VOUT=5V,IOUT=0.05A~0.3A
VIN=72V,VOUT=5V,IOUT=0.05A~0.3A
45
40
35
30
25
20
0.05
0.10
0.15
0.20
0.25
0.30
Output current(A)
Figure10. XL7045 System Application (Efficiency VS Output Current)
Rev 1.5
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Datasheet
0.3A 100KHz 100V Buck DC to DC Converter
XL7045
Package Information
SOP8-EP Mechanical Dimensions
Rev 1.5
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Datasheet
0.3A 100KHz 100V Buck DC to DC Converter
XL7045
Important Notice
XLSEMI reserve the right to make modifications, enhancements, improvements, corrections
or other changes without notice at any time. XLSEMI does not assume any liability arising out
of the application or use of any product described herein; neither does it convey any license
under its patent rights, nor the rights of others. XLSEMI assumes no liability for applications
assistance or the design of Buyers’ products. Buyers are responsible for their products and
applications using XLSEMI components. To minimize the risks associated with Buyers’
products and applications, Buyers should provide adequate design and operating safeguards.
XLSEMI warrants performance of its products to the specifications applicable at the time of
sale, in accordance with the warranty in XLSEMI’s terms and conditions of sale of
semiconductor products. Testing and other quality control techniques are used to the extent
XLSEMI deems necessary to support this warranty. Except where mandated by applicable
law, testing of all parameters of each component is not necessarily performed.
For the latest product information, go to www.xlsemi.com.
Rev 1.5
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