LM2594M-12

UMW R UMW LM2594(HV) Features General Description 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 (57 V for the HV Version) The LM2594(HV) is a 150 KHz fixed fre- n n Maximum Duty Cycle 100% Minimum Drop Out 1.5V n n n Fixed 150KHz Switching Frequency 1.5A Constant Output Current Capability Internal Optimize Power Transistor High efficiency n n n n n n n n quency PWM buck (step-down)DC/DC converter, capable of driving a 1.5A 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. Excellent line and load regulation TTL shutdown capability ON/OFF pin with hysteresis function 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. Built in thermal shutdown function Built in current limit function Built in second current limit function Available in SOP-8 package Applications n n n n n LCD Monitor and LCD TV Digital Photo Frame Set-up Box ADSL Modem Telecom / Networking Equipment Figure1. Package Type of LM2594(HV) www.umw-ic.com 1 友台半导体有限公司 UMW R UMW LM2594(HV) Pin Configurations NC 1 NC 2 8 Output 7 VIN LM2594(HV) NC Feedback 3 6 GND 4 5 ON/OFF Figure2. Pin Configuration of LM2594(HV) (Top View) Table 1 Pin Description Pin Number Pin Name 1,2,3 NC NO connection 7 VIN Supply Voltage Input Pin. LM2594(HV) operates from a 4.5V to 40V DC voltage. Bypass Vin to GND with a suitably large capacitor to eliminate noise on the input. 8 OUTPUT 6 4 5 www.umw-ic.com GND Description Power Switch Output Pin (SW). Output is the switch node that 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 path to prevent switching current spikes from inducing voltage noise into LM2594(HV). 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. ON/OFF Enable Pin. Drive ON/OFF pin low to turn on the device, drive it high to turn it off. Floating is default low. 2 友台半导体有限公司 UMW R UMW LM2594(HV) Function Block Figure3. Function Block Diagram of LM2594(HV) Typical Application Circuit FEEDBACK VIN LM2594-5.0 GND +12V CIN 470uf 35V C1 105 L1 68uh/3A OUTPUT ON/OFF 5V/1.5A COUT D1 180uf 35V 1N5820 OFF ON LOAD Figure4. LM2594(HV) Typical Application Circuit 12V-5V/1.5A www.umw-ic.com 3 友台半导体有限公司 UMW R UMW LM2594(HV) LM2594(HV) Absolute Maximum Ratings（Note1） Parameter Input Voltage Symbol Vin Value LM2594 -0.3 to 45 LM2594(HV) -0.3 to 60 Unit V Feedback Pin Voltage VFB -0.3 to Vin V ON/OFF Pin Voltage VON/OFF -0.3 to Vin V Output Switch Pin Voltage VOutput -0.3 to Vin V Power Dissipation PD Internally limited mW Thermal Resistance (SOP-8) (Junction to Ambient, No Heatsink, Free Air) RJA 100 ºC/W TJ -40 to 125 ºC TSTG -65 to 150 ºC TLEAD 260 ºC 2000 V Operating Junction Temperature Storage Temperature Lead Temperature (Soldering, 10 sec) ESD (HBM) 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. www.umw-ic.com 4 友台半导体有限公司 UMW R UMW LM2594(HV) LM2594(HV)-3.3 Electrical Characteristics Ta = 25℃;unless otherwise specified. Symbol Parameter Test Condition Min. Typ. Max. Unit 3.168 3.3 3.432 V - 75 - % Min. Typ. Max. Unit 4.8 5 5.2 V - 82 - % Min. Typ. Max. Unit 11.52 12 12.48 V - 90 - % Min. Typ. Max. Unit 1.193 1.23 1.267 V - 74 - % System parameters test circuit figure5 Output Voltage VOUT ŋ Efficiency Vin = 4.75V to 40V(60v) Iload=0.2A to 1.5A Vin=12V ,Vout=3.3V Iout=1.5A LM2594(HV)-5.0 Electrical Characteristics Ta = 25℃;unless otherwise specified. Symbol Parameter Test Condition System parameters test circuit figure5 Output Voltage VOUT ŋ Efficiency Vin = 7V to 40V(60V) Iload=0.2A to 1.5A Vin=12V ,Vout=5V Iout=1.5A LM2594(HV)-12 Electrical Characteristics Ta = 25℃;unless otherwise specified. Symbol Parameter Test Condition System parameters test circuit figure5 Output Voltage VOUT ŋ Efficiency Vin = 15V to 40V(60V) Iload=0.2A to 1.5A Vin=25V ,Vout=12V Iout=1.5A LM2594(HV)-ADJ Electrical Characteristics Ta = 25℃;unless otherwise specified. Symbol Parameter Test Condition System parameters test circuit figure5 VOUT Efficiency www.umw-ic.com Output Voltage ŋ Vin = 4.5V to 40V(57V) Iload=0.2A to 1.5A Vin=12V ,Vout=3V Iout=1.5A 5 友台半导体有限公司 UMW R UMW LM2594(HV) LM2594(HV) 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 Symbol Test Condition LM2594 Input operation voltage Min. Typ. 4.5 Max. Unit 40 Vin V LM2594(HV) 4.5 Shutdown Supply Current 60 VON/OFF=5V 80 200 uA VON/OFF=0V, VFB =Vin 2 10 mA 150 173 Khz Quiescent Supply Current ISTBY Oscillator Frequency Fosc Switch Current Limit IL VFB =0 2 A VON/OFF High (Regulator OFF) Low (Regulator ON) 1.4 0.8 V IH VON/OFF =2.5V (OFF) 5 15 uA IL VON/OFF =0.5V (ON) 0.2 5 uA VCE VFB=0V Iout=1.5A 1.2 1.4 V DMAX VFB=0V 100 ON/OFF Pin Threshold ON/OFF Pin Input Leakage Current Output Saturation Voltage Max. Duty Cycle www.umw-ic.com 127 6 % 友台半导体有限公司 UMW R UMW LM2594(HV) Test Circuit and Layout guidelines LM2594 LM2594 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 PIN5~8; 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.) www.umw-ic.com 7 友台半导体有限公司 UMW R UMW LM2594(HV) LM2594(HV) Series Buck Regulator Design Procedure (Fixed Output) Conditions Output Voltage (V) 3.3 Load Current (A) 1.5 5 1.5 12 1.5 www.umw-ic.com Max Input Voltage (V) Inductor (L1) Inductance (uh) 6 10 40 9 20 40 15 20 40 22 33 47 22 68 68 33 68 150 Output Capacitor (COUT) Through Hole Electrolytic Panasonic Nichicon HFQ Series PL Series (uf/V) (uf/V) 470/25 470/35 330/35 330/35 330/35 270/50 470/25 560/16 180/35 180/35 180/35 180/35 330/25 330/25 180/25 180/25 82/25 82/25 8 Surface Mount Tantalum AVX TPS Sprague Series 595D Series (uf/V) (uf/V) 330/6.3 390/6.3 330/6.3 390/6.3 220/10 330/10 220/10 330/10 100/10 270/10 100/10 270/10 100/16 180/16 100/16 120/20 68/20 68/25 友台半导体有限公司 UMW R UMW LM2594(HV) LM2594(HV) 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 1A 3A Surface Through VR (The same as system maximum input voltage) Mount Hole 20V 30V 40V 50V 1N5817 1N5818 1N5819 √ √ 1N5820 1N5821 1N5822 √ MBR320 MBR330 MBR340 MBR350 MBR360 SK32 SK33 SK34 SK36 30WQ03 30WQ04 30WQ05 31DQ03 31DQ04 31DQ05 SR303 SR304 SR305 √ √ √ √ www.umw-ic.com 60V SR302 9 SK35 SR306 友台半导体有限公司 UMW R UMW LM2594(HV) Typical System Application for 3.3V Version FEEDBACK VIN +12V CIN 470uf 35V C1 105 OUTPUT LM2594-3.3 GND L1 47uh/3A 3.3V/1.5A COUT ON/OFF D1 330uf 35V 1N5820 OFF ON LOAD Figure6. LM2594(HV)-3.3 System Parameters Test Circuit Typical System Application for 5V Version FEEDBACK VIN +12V CIN 470uf 35V C1 105 OUTPUT LM2594-5.0 GND L1 68uh/3A ON/OFF 5V/1.5A COUT D1 180uf 35V 1N5820 OFF ON LOAD Figure7. LM2594(HV)-5.0 System Parameters Test Circuit www.umw-ic.com 10 友台半导体有限公司 UMW R UMW LM2594(HV) Typical System Application for 12V Version FEEDBACK VIN OUTPUT LM2594-12 GND +24V CIN 470uf 50V C1 105 L1 68uh/3A 12V/1.5A COUT ON/OFF D1 180uf 25V 1N5821 OFF ON LOAD Figure8. LN2594(HV)-12 System Parameters Test Circuit Typical System Application for ADJ Version CFF 3.3n R2 3.1K R1 1K FEEDBACK VIN +24V CIN 470uf 50V OUTPUT LM2594-ADJ GND C1 105 L1 47uh/3A ON/OFF 5V/1.5A COUT D1 470uf 35V 1N5821 OFF ON LOAD VOUT=1.23*(1+R2/R1) Figure9. LM2594(HV)-ADJ System Parameters Test Circuit www.umw-ic.com 11 友台半导体有限公司 UMW R UMW LM2594(HV) Package Information SOP8 Package Mechanical Dimensions www.umw-ic.com 12 友台半导体有限公司 UMW R UMW LM2594(HV) Ordering information Order code UMW LM2594M-3.3 UMW LM2594M-5.0 UMW LM2594M-12 UMW LM2594M-ADJ UMW LM2594HVM-3.3 UMW LM2594HVM-5.0 UMW LM2594HVM-12 UMW LM2594HVM-ADJ www.umw-ic.com Package SOP-8 SOP-8 SOP-8 SOP-8 SOP-8 SOP-8 SOP-8 SOP-8 Baseqty 2500 2500 2500 2500 2500 2500 2500 2500 Delivery mode Tape and reel Tape and reel Tape and reel Tape and reel Tape and reel Tape and reel Tape and reel Tape and reel 13 Operating temperature range -20°- +85° -40°- +85° 友台半导体有限公司