3A 150KHz 40V Buck DC to DC Converter XL2596 Features n n n n n n n n n n n n n n n n n n n n n
Wide 4.5V to 40V Input Voltage Range 3.3V,5V,12V, and adjustable versions Output Adjustable from 1.23V to 37V Maximum Duty Cycle 100% Minimum Drop Out 1.5V Fixed 150KHz Switching Frequency 3A Constant Output Current Capability Internal Optimize Power Transistor High efficiency Excellent line and load regulation TTL shutdown capability ON/OFF pin with hysteresis function Built in thermal shutdown function Built in current limit function Built in second current limit function Available in TO-220,TO-263 packages General Description The XL2596 is a 150 KHz fixed frequency PWM buck (step-down) DC/DC converter, capable of driving a 3A 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 second current limit function happens, the operation frequency will be reduced from 150KHz to 50KHz. An internal compensation block is built in to minimize external component count.
Applications LCD Monitor and LCD TV Digital Photo Frame Set-up Box ADSL Modem
Telecom / Networking Equipment
Figure1. Package Type of XL2596
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Datasheet
3A 150KHz 40V Buck DC to DC Converter XL2596 Pin Configurations
Figure2. Pin Configuration of XL2596 (Top View)
Table 1 Pin Description
Pin Number
1 2 3
Description
Supply Voltage Input Pin. XL2596 operates from a 4.5V to 40V DC voltage. Bypass Vin to GND with a suitably large VIN
capacitor to eliminate noise on the input.
Power Switch Output Pin (SW). Output is the switch node that OUTPUT
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
GND
ground path to prevent switching current spikes from inducing voltage noise into XL2596.
Feedback Pin (FB). Through an external resistor divider
FEEDBACK network, Feedback senses the output voltage and regulates it.
The feedback threshold voltage is 1.23V.
Enable Pin. Drive ON/OFF pin low to turn on the device, drive
ON/OFF
it high to turn it off. Floating is default low. Pin Name
4 5
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Datasheet
3A 150KHz 40V Buck DC to DC Converter XL2596 Function Block
Figure3. Function Block Diagram of XL2596
Typical Application Circuit
Figure4. XL2596 Typical Application Circuit 12V-5V/3A
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Datasheet
3A 150KHz 40V Buck DC to DC Converter XL2596 Ordering Information
XL2596 E1 E1: Lead Free Circuit Type Package S: TO263-5L T: TO220-5L Version ADJ: Adjust 3.3: 3.3V 5.0: 5V 12: 12V Package Temperature Range -40oC ~ 85oC TO220-5L TO263-5L -40oC ~ 85oC Marking ID Lead Free XL2596T-ADJE1 XL2596T-3.3E1 XL2596T-5.0E1 XL2596T-12E1 XL2596S-ADJE1 XL2596S-3.3E1 XL2596S-5.0E1 XL2596S-12E1 Packing Type Supplied As Tube Tube Tube Tube 800 Units on Tape & Reel 800 Units on Tape & Reel 800 Units on Tape & Reel 800 Units on Tape & Reel
XLSEMI Pb-free products, as designated with “E1” suffix in the par number, are RoHS compliant.
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Datasheet
3A 150KHz 40V Buck DC to DC Converter XL2596 Absolute Maximum Ratings（Note1） Parameter Input Voltage Feedback Pin Voltage ON/OFF Pin Voltage Output Switch Pin Voltage Power Dissipation Thermal Resistance (TO220 & TO263) (Junction to Ambient, No Heatsink, Free Air) Operating Junction Temperature Storage Temperature Lead Temperature (Soldering, 10 sec) ESD (HBM) Symbol Vin VFB VON/OFF VOutput PD RJA TJ TSTG TLEAD Value -0.3 to 45 -0.3 to Vin -0.3 to Vin -0.3 to Vin Internally limited 30 -40 to 125 -65 to 150 260 2000 Unit V V V V mW ºC/W 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.
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Datasheet
3A 150KHz 40V Buck DC to DC Converter XL2596 XL2596-3.3 Electrical Characteristics Ta = 25℃;unless otherwise specified. Symbol
Parameter
Test Condition Min. Typ. Max. Unit
System parameters test circuit figure6 VOUT Efficiency
Output Voltage
Vin = 4.75V to 40V Iload=0.2A to 3A Vin=12V ,Vout=3.3V Iout=3A 3.168 - 3.3 73 3.432 -
V %
ŋ
XL2596-5.0 Electrical Characteristics
Ta = 25℃;unless otherwise specified. Symbol
Parameter Test Condition Min. Typ. Max. Unit
System parameters test circuit figure7 VOUT Efficiency Output Voltage
Vin = 7V to 40V Iload=0.2A to 3A Vin=12V ,Vout=5V
Iout=3A
4.8 - 5 80
5.2 -
V %
ŋ
XL2596-12 Electrical Characteristics Ta = 25℃;unless otherwise specified. Symbol Parameter Test Condition Min. Typ. Max. Unit
System parameters test circuit figure8 VOUT Efficiency Output Voltage
Vin = 15V to 40V Iload=0.2A to 3A Vin=25V ,Vout=12V
Iout=3A
11.52 - 12 90 12.48 -
V %
ŋ
XL2596-ADJ Electrical Characteristics Ta = 25℃;unless otherwise specified. Symbol Parameter Test Condition Min. Typ. Max. Unit
System parameters test circuit figure9 VOUT Efficiency Rev 2.4
6
Output Voltage
ŋ
Vin = 4.5V to 40V Iload=0.2A to 3A Vin=12V ,Vout=3V Iout=3A
1.193 1.23 1.267 -
73
-
V %
Datasheet
3A 150KHz 40V Buck DC to DC Converter XL2596 Electrical Characteristics (DC Parameters) Vin = 12V for the 3.3V,5V,and Adjustable versions and Vin=24V for the 12V version, GND=0V, Vin & GND parallel connect a 220uf/50V capacitor; Iout=500mA, Ta = 25℃; the others floating unless otherwise specified. Parameters Input operation voltage Shutdown Supply Current Quiescent Supply Current Oscillator Frequency Switch Current Limit ON/OFF Pin Threshold ON/OFF Pin Leakage Current
Input Symbol Vin ISTBY Iq Fosc IL VON/OFF IH IL VCE DMAX
Test Condition VON/OFF=5V VON/OFF =0V, VFB =Vin VFB =0
High (Regulator OFF) Low (Regulator ON) VON/OFF =2.5V (OFF) VON/OFF =0.5V (ON) VFB=0V Iout=3A VFB=0V
Min. Typ. Max. Unit 4.5 127 3.6
80 2 150 4.8 1.4 0.8 5 0.2 1.3 100
40 200 10 173 6.9 15 5 1.5
V uA mA Khz A V uA uA V %
Output Saturation Voltage Max. Duty Cycle
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Datasheet
3A 150KHz 40V Buck DC to DC Converter XL2596
Test Circuit and Layout guidelines
Figure5. Standard Test Circuits and Layout Guides Select R1 to be approximately 1K, 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 PIN1 and PIN3; 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.)
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Datasheet
3A 150KHz 40V Buck DC to DC Converter XL2596
XL2596 Series Buck Regulator Design Procedure (Fixed Output)
Conditions Inductor (L1)
Output Load Max Input Inductance Voltage Current Voltage (V) (uh) (V) (A) 3.3 3 5 22
7 22 10 22 40 33
2 6 22
10 33 40 47
5 3 8 22
10 22 15 33 40 47
2 9 22
20 68 40 68
12 3 15 22
18 33 30 68 40 68
2 15 33 20 68 40 150 Output Capacitor (COUT) Through Hole Electrolytic Panasonic Nichicon HFQ Series PL Series (uf/V) (uf/V) 470/25 560/16 560/35 560/35 680/35 680/35 560/35 470/35 470/25 470/35 330/35 330/35 330/35 270/50 470/25 560/16 560/25 560/25 330/35 330/35 330/35 270/35 470/25 560/16 180/35 180/35 180/35 180/35 470/25 470/25 330/25 330/25 180/25 180/25 180/35 180/25 330/25 330/25 180/25 180/25 82/25 82/25 Surface Mount Tantalum AVX TPS Sprague Series 595D Series
(uf/V) (uf/V)
330/6.3 390/6.3 330/6.3 390/6.3 330/6.3 390/6.3 330/6.3 390/6.3 330/6.3 390/6.3 330/6.3 390/6.3 220/10 330/10 220/10 330/10 220/10 330/10 220/10 330/10 220/10 330/10 220/10 330/10 100/10 270/10 100/10 270/10 100/16 180/16 100/16 180/16 100/16 120/20 100/16 120/20 100/16 180/16 100/16 120/20 68/20 68/25
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Datasheet
3A 150KHz 40V Buck DC to DC Converter XL2596
XL2596 Series Buck Regulator Design Procedure (Adjustable Output)
Output Voltage (V) 2 4 6 9 12 15 24 28
Through Hole Output Electrolytic Panasonic Nichicon Feedforward Capacitor HFQ Series PL Series (uf/V) (uf/V) 820/35 820/35 33nf 560/35 470/35 10nf 470/25 470/35 3.3nf 330/25 330/25 1.5nf 330/25 330/25 1nf 220/25 220/35 680pf 220/35 150/35 560pf 100/50 100/50 390pf Surface Mount Output Capacitor AVX TPS Sprague Feedforward Series 595D Series Capacitor (uf/V) (uf/V) 330/6.3 470/4 33nf 330/6.3 390/6.3 10nf 220/10 330/10 3.3nf 100/16 180/16 1.5nf 100/16 180/16 1nf 68/20 120/20 680pf 33/25 33/25 220pf 10/35 15/50 220pf
Schottky Diode Selection Table
Current Surface Mount
1A 3A
√ √ 5A
√
√ √ √
1N5823 SR502 SB520
1N5824 SR503 SB530 50WQ03
1N5825 SR504 SB540
SR505 SB550
SR506 SB560
√ √ √ √
1N5820 MBR320 SK32 SR302 1N5821 MBR330 SK33 30WQ03 31DQ03 SR303 1N5822 SK34 SK35 MBR360 SK36 SR306
MBR340 MBR350 30WQ04 30WQ05 31DQ04 31DQ05 SR304 SR305 Through VR (The same as system maximum input voltage) Hole 20V 30V 40V 50V 60V 1N5817 1N5818 1N5819 √
50WQ04 50WQ05
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Datasheet
3A 150KHz 40V Buck DC to DC Converter XL2596
Typical System Application for 3.3V Version
Figure6. XL2596-3.3 System Parameters Test Circuit
Typical System Application for 5V Version
Figure7. XL2596-5.0 System Parameters Test Circuit
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Datasheet
3A 150KHz 40V Buck DC to DC Converter XL2596
Typical System Application for 12V Version
Figure8. XL2596-12 System Parameters Test Circuit
Typical System Application for ADJ Version
CFF 10nR1 1KR2 3.1KFEEDBACK4VINOUTPUT1XL2596-ADJ235GNDON/OFF+24VCIN470uf 50VC1 105OFFONL1 47uh/3A5V/3ACOUTD1 470uf 35V1N5821LOADVOUT=1.23*(1+R2/R1)
Figure9. XL2596-ADJ System Parameters Test Circuit
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Datasheet
3A 150KHz 40V Buck DC to DC Converter XL2596 Package Information
(1) TO220-5L
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Datasheet
3A 150KHz 40V Buck DC to DC Converter XL2596 Package Information
(2) TO263-5L
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