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Datasheet
3A 380KHz 18V Buck DC to DC Converter XL1530
Features General Description
n Wide 3.6V to 18V Input Voltage Range The XL1530 is a 380KHz fixed frequency
n Output Adjustable from 0.8V to 16V PWM buck (step-down) DC/DC converter,
n Maximum Duty Cycle 100% capable of driving a 3A load with high
n Minimum Drop Out 0.6V efficiency, low ripple and excellent line and
n Fixed 380KHz Switching Frequency load regulation. Requiring a minimum
n 3A Constant Output Current Capability number of external components, the regulator
n Internal Optimize Power MOSFET is simple to use and include internal
n High efficiency frequency compensation and a
n Excellent line and load regulation
fixed-frequency oscillator.
n TTL shutdown capability
n EN pin with hysteresis function
The PWM control circuit is able to adjust the
n Built in thermal shutdown function
duty ratio linearly from 0 to 100%. An enable
n Built in current limit function
function, an over current protection function
n Built in output short protection function
is built inside. When short protection function
n Available in SOP8 package
happens, the operation frequency will be
reduced from 380KHz to 80KHz. An internal
compensation block is built in to minimize
Applications
external component count.
n LCD Monitor and LCD TV
n Digital Photo Frame
n Set-up Box
n ADSL Modem
n Telecom / Networking Equipment
Figure1. Package Type of XL1530
Rev 1.0 www.xlsemi.com
1
Datasheet
3A 380KHz 18V Buck DC to DC Converter XL1530
Pin Configurations
FB 1 8 GND
EN 2 7 GND
XL1530
NC 3 6 SW
VIN 4 5 SW
Figure2. Pin Configuration of XL1530 (Top View)
Table 1 Pin Description
Pin Number Pin Name Description
3 NC No Connected.
Supply Voltage Input Pin. XL1530 operates from a 3.6V to 18V
4 VIN 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
5,6 SW
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
7,8 GND
path to prevent switching current spikes from inducing voltage
noise into XL1530.
Feedback Pin (FB). Through an external resistor divider
1 FB network, Feedback senses the output voltage and regulates it.
The feedback threshold voltage is 0.8V.
Enable Pin. Drive EN pin low to turn off the device, drive it
2 EN
high to turn it on. Floating is default high.
Rev 1.0 www.xlsemi.com
2
Datasheet
3A 380KHz 18V Buck DC to DC Converter XL1530
Function Block
Figure3. Function Block Diagram of XL1530
Typical Application Circuit
CFF 33n
R1
2K R2
FB L 33uh/3A
1
VIN VIN SW VOUT
4 XL1530
5,6
7,8 2
GND EN D1 1N5821
CIN C1
ON COUT
220uf/35V 105
OFF 220uf/35V
VOUT=0.8*(1+R2/R1)
Figure4. XL1530 Typical Application Circuit
Rev 1.0 www.xlsemi.com
3
Datasheet
3A 380KHz 18V Buck DC to DC Converter XL1530
Ordering Information
Order Information Marking ID Package Type Packing Type Supplied As
XL1530E1 XL1530E1 SOP-8L 2500 Units on Tape & Reel
XLSEMI Pb-free products, as designated with "E1" suffix in the par number, are RoHS compliant.
Absolute Maximum RatingsNote1
Parameter Symbol Value Unit
Input Voltage Vin -0.3 to 20 V
Feedback Pin Voltage VFB -0.3 to Vin V
EN Pin Voltage VEN -0.3 to Vin V
Output Switch Pin Voltage VOutput -0.3 to Vin V
Power Dissipation PD Internally limited mW
Thermal Resistance (SOP8)
RJA 100