Datasheet
0.4A 150KHz 80V Buck DC to DC Converter
Features
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Wide 5V to 80V Operation Voltage
Output Adjustable from 1.25V to 20V
Maximum Duty Cycle 100%
Minimum Drop Out 1V
Fixed 150KHz Switching Frequency
Maximum 0.4A Output Current
Recommend output power less than 5W
Internal Optimize HV Power Transistor
High efficiency up to 85%
Excellent line and load regulation
TTL shutdown capability
Built in thermal shutdown function
Built in output short Protection Function
Built in current limit function
SOP8-EP (Exposed PAD) package
XL7005A
General Description
The XL7005A is a 150KHz fixed frequency
PWM buck (step-down) DC/DC converter,
capable of driving a 0.4A 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 enable
function, an over current protection function
is built inside. When output short protection
function happens, the operation frequency
will be reduced from 150KHz to 45KHz. An
internal compensation block is built in to
minimize external component count.
Applications
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Ebike Controller Power Supply
Telecom / Networking Equipment
Figure1. Package Type of XL7005A
Rev 1.0
1
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Datasheet
0.4A 150KHz 80V Buck DC to DC Converter
Pin Configurations
XL7005A
VIN
SW
FB
EN
1
2
XL7005A
3
4
8
7
6
5
GND
GND
GND
GND
The Exposed PAD is GND
Figure2. Pin Configuration of XL7005 A(Top View)
Table 1 Pin Description
Pin Number
1
2
3
4
5~8
Pin Name
VIN
SW
FB
EN
GND
Description
Supply Voltage Input Pin. XL7005A operates from a 5V to 80V
DC voltage. 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
network, Feedback senses the output voltage and regulates it.
The feedback threshold voltage is 1.25V.
Enable Pin. Drive EN pin low to turn on the device, drive it high
to turn it off. Floating is default low.
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 XL7005A. The exposed PAD is GND.
Rev 1.0
2
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Datasheet
0.4A 150KHz 80V Buck DC to DC Converter
Function Block
XL7005A
Figure3. Function Block Diagram of XL7005A
Typical Application Circuit
Figure4. XL7005A Typical Application Circuit
Rev 1.0
3
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Datasheet
0.4A 150KHz 80V Buck DC to DC Converter
Ordering Information
Order Information
XL7005A
Marking ID
XL7005A
Package Type
SOP8-EP
Packing Type Supplied As
2500 Units on Tape & Reel
XL7005A
Absolute Maximum Ratings（Note1）
Parameter
Input Voltage
Feedback Pin Voltage
EN Pin Voltage
Output Switch Pin Voltage
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)
ESD (HBM)
Symbol
Vin
V
FB
V
EN
V
SW
P
D
R
JA
T
J
T
J
T
STG
T
LEAD
Value
-0.3 to 85
-0.3 to Vin
-0.3 to Vin
-0.3 to Vin
Internally limited
60
-40 to 150
-40 to 125
-65 to 150
260
>3000
Unit
V
V
V
V
mW
ºC/W
ºC
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 1.0
4
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Datasheet
0.4A 150KHz 80V Buck DC to DC Converter
XL7005A Electrical Characteristics
T
a
= 25℃;unless otherwise specified.
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
XL7005A
System parameters test circuit figure4
VFB
FB Voltage
Efficiency
Efficiency
Efficiency
Vin =20V to 80V
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
1.225
-
-
-
1.25
85
81
75
1.275
-
-
-
V
%
%
%
ŋ
ŋ
ŋ
Electrical Characteristics (DC Parameters)
Vin = 48V, GND=0V, Vin & GND parallel connect a 33uf/100V capacitor; Iout=0.2A, 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
EN Pin Input Leakage
Current
Output Saturation Voltage
Max. Duty Cycle
Symbol
Vin
I
STBY
I
q
Fosc
I
L
V
EN
I
H
I
L
V
CE
D
MAX
V
FB
=0
High (Regulator OFF)
Low (Regulator ON)
V
EN
=2.5V (OFF)
V
EN
=0.5V (ON)
V
FB
=0V
I
out
=0.4A
V
FB
=0V
V
EN
=2V
V
EN
=0V,
V
FB
=Vin
120
Test Condition
Min.
5
85
2.5
150
0.5
1.6
0.8
6
1
0.87
100
20
10
Typ.
Max.
80
200
5
180
Unit
V
uA
mA
KHz
A
V
uA
uA
V
%
Rev 1.0
5
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