LM2674M-5.0

UMW R LM2674 DC-DC switching buck converter ■ Product Introduction Top View SOP-8 LM2674 series is a DC/DC switching buck converter controlled by a fixed frequency of 260kHz PWM.It is mainly composed of internal frequency compensation, fixed frequency oscillator, built-in overcurrent protection, power switch control and other circuits. It can drive 500MA load with high efficiency, low ripple, good linearity and load adjustment ability.Only a few external components are needed to realize the function of DC/DC voltage reduction and stabilization, which is very simple and practical.PWM control circuit can adjust the duty cycle from 0 according to the load To 100% to achieve high work efficiency.It has an external enabling control opening function, which can realize the controllable switch between standby and work, making the application more flexible. ■ ■ Product features Pinserial number ● Built in overtemperature shutdown function ● Built in overcurrent protection function ● Internal integrated efficient power switch ● Good linearity and load adjustment capability ■ Packaging form and pin function definition Pin definition Function description SOP- 8 1 CB 2 NC Empty port 3 NC Empty port 4 FB Feedback control terminal 5 ON/OFF 6 GND Enable terminal High=ON and low=OFF Power supply ground terminal Fixed output voltage: 3.3V, 5V, 12V, 7 VIN Adjustable output voltage range: 1.21V~37V (adjustable) 8 VSW ● ● ● ● ON/OFF pin with hysteresis function ● ● ● Wide input voltage range: 7V~40V ● ● ● ● ● High precision output: ± 2% TTL shutdown capability high efficiency Simple periphery Boost capacitance terminal Positive terminal of power supply Power switch output terminal (SW) Fixed switching frequency: 260 kHz Maximum output current capacity: 500mA Minimum linear drop voltage drop: 1.5V Package form: SOP-8 Product use ● ● ● LCD and LCD TV ● Digital photo frame ● Telecommunication/network equipment ADSL modem LED lights, LED backlight www.umw-ic.com 1 UTD Semiconductor Co.,Limited UMW R LM2674 DC-DC switching buck converter ■ Application circuit VOUT= VREF (1+R2/R1) CB : 103/50V www.umw-ic.com 2 UTD Semiconductor Co.,Limited UMW R LM2674 DC-DC switching buck converter ■ Limit parameter project Symbol explain Limit value Company VIN Input terminal voltage -0.3~42 V VFB FB feedback terminal voltage -0.3~VIN V VVSW Switch output terminal -1~VIN V Voltage VON-OFF Maximum power consumption thermal resistance temperature voltage -0.3~6 Enable enabling terminal voltage V PD SOP8 package 500 mW RJA Put in air without external heat sink 30 ℃/W Tj Operating temperature range -40—125 Tc Storage temperature range -40—150 Th welding temperature ℃ ℃,10s 260 Note: Limit parameter refers to the limit value that cannot be exceeded under any conditions.Once the limit value is exceeded , it may cause physical damage such as product deterioration;At the same time, the chip can not be guaranteed to work normally under the limit parameters. ■ electrical properties ◆ LM2674-3.3V project ( Ta=25℃) Symbol Test conditions output voltage VOUT V =7V to 40V, IOUT =20MA to500MA Enable shutdown current Quiescent current ISTB Output peak current Output leakage current Enable enable terminal current Enable effective voltage of minimum value Typical value Maximum Company 3.234 3.3 3.366 V V =40V, VON-OFF=0V - 100 200 uA Iq V =12V, VFB =8V, VON-OFF =5V, - 3 7 mA ICL V =12V,VON-OFF=5V,VFB=0, no L1 and D1 - 1.2 - A 10 uA IOL IN IN IN IN V =40V,VON-OFF=0V, IN no L1 and D1 V VSW=0V - VVSW=-1V - 2.5 10 mA ION-OFFL V =12V,VON-OFF=0.5V - 4 15 uA ION-OFFH V =12V,VON-OFF=2.5V - 1.5 15 uA VON-OFFH V =12V(ON) 1.5 - - V VON-OFFL V =12V(OFF) - - 0.8 V V =12V,VFB=0V, IOUT=500MA - 1.0 1.5 V 225 260 275 kHz IN IN IN IN enable terminal Output saturation voltage VCE switching frequency fosc Duty cycle D V =12V,VFB=0V, 0 - 100 % efficiency η V =12V, VOUT =3.3V, IOUT=500MA - 80 - % input voltage V - 7 - 40 V www.umw-ic.com MAX IN IN V =12V IN IN IN 3 UTD Semiconductor Co.,Limited UMW R LM2674 DC-DC switching buck converter ◆ LM2674-5.0V ( Ta=25℃) project Symbol output voltage VOUT V =7 to 40V, IOUT =20MA to500MA Enable shutdown current ISTB Quiescent current Output peak current V V =40V, VON-OFF=0V - 100 200 uA Iq V =12V, VFB =8V, VON-OFF =5V, - 3 7 mA ICL V =12V,VON-OFF=5V,VFB=0, no L1 and D1 - 1.2 - A 10 uA voltage of IN IN IN IN V VSW=0V - VVSW=-1V - 2.5 10 mA V =12V,VON-OFF=0.5V - 4 15 uA ION-OFFH V =12V,VON-OFF=2.5V - 1.5 15 uA VON-OFFH V =12V(ON) 1.5 - - V VON-OFFL V =12V(OFF) - - 0.8 V V =12V,VFB=0V, IOUT=500MA - 1.0 1.5 V 225 260 275 kHz - 100 % 80 - % 40 V ION-OFFL effective Maximum Company 5.10 Enable enable Enable Typical value 5 IOL current minimum value 4.90 Output leakage current terminal Test conditions V =40V,VON-OFF=0V, IN no L1 and D1 IN IN IN IN enable terminal Output saturation voltage VCE switching frequency fosc Duty cycle D V =12V,VFB=0V, 0 efficiency η V =12V, VOUT=5V,IOUT=500MA - input voltage V - 7 www.umw-ic.com MAX IN IN V =12V IN IN IN 4 - UTD Semiconductor Co.,Limited UMW R LM2674 DC-DC switching buck converter ◆ LM2674-12V ( Ta=25℃) project Symbol output voltage VOUT V =14 to 40V, IOUT =20MA to500MA Enable shutdown current ISTB Quiescent current Output peak current 12.24 V V =40V, VON-OFF=0V - 100 200 uA Iq V =15V, VFB =13V, VON-OFF =5V, - 3 7 mA ICL V =15V,VON-OFF=5V,VFB=0, no L1 and D1 - 1.2 - A 10 uA voltage of IN IN IN - VVSW=-1V - 2.5 10 mA V =15V,VON-OFF=0.5V - 4 15 uA ION-OFFH V =15V,VON-OFF=2.5V - 1.5 15 uA VON-OFFH V =15V(ON) 1.5 - - V VON-OFFL V =15V(OFF) - - 0.8 V V =15V,VFB=0V, IOUT=500MA - 1.0 1.5 V 225 260 275 kHz ION-OFFL effective IN V VSW=0V Enable enable Enable Maximum Company 12 IOL current minimum Typical value value 11.76 Output leakage current terminal Test conditions V =40V,VON-OFF=0V, IN no L1 and D1 IN IN IN IN enable terminal Output saturation voltage VCE switching frequency fosc Duty cycle D V =15V,VFB=0V, 0 - 100 % efficiency η V =15V, VOUT =12V, IOUT=500MA - 85 - % input voltage V - - 40 V www.umw-ic.com MAX IN IN V =15V IN IN IN 13.5 5 UTD Semiconductor Co.,Limited UMW R LM2674 DC-DC switching buck converter ◆ LM2674-ADJ ( Ta=25℃) project Symbol Test conditions minimum value Typical value Maximum Company 1.185 1.21 1.234 V Reference voltage V V =7V to 40V, IOUT =20MA to 500MA Enable shutdown current ISTB V =40V,VON-oOFF= VVSW - 100 200 uA Quiescent current Iq VON-oOFF =0V,VFB =V - 3 7 mA Output peak current ICL VON-OFF =VFB=0, no L1 and D1 - 1.2 - A 10 uA REF VVSW=-1V - 2.5 10 mA V =12V,VON-OFF=0.5V - 4 15 uA ION-OFFH V =12V,VON-OFF=2.5V - 1.5 15 uA VON-OFFH V =12V(OFF) 1.5 - - V VON-OFFL V =12V(ON) - - 0.8 V Enable enable ION-OFFL Enable effective voltage of IN - IOL current IN V VSW=0V Output leakage current terminal IN V =VFB ,VON-OFF=5V,no L1 IN and D1 IN IN IN IN enable terminal Feedback terminal current IFB V =12V, IFB=1.3V - 85 - nA Output saturation voltage VCE V =12V,VFB=0V, IOUT = 500MA - 1.0 1.5 V switching frequency fosc 225 260 275 kHz Duty cycle D V =12V,VFB=0V, 0 - 100 % efficiency η V =12V, VOUT =5V, IOUT =500MA - 80 - % input voltage V - 7 - 40 V www.umw-ic.com MAX IN IN IN V =12V IN IN IN 6 UTD Semiconductor Co.,Limited UMW R LM2674 DC-DC switching buck converter ■ Encapsulation information SOP-8 Symbol A A1 A2 b c D E E1 e L θ www.umw-ic.com Dimensions In Millimeters Min Max 1.350 1.750 0.100 0.250 1.350 1.550 0.330 0.510 0.170 0.250 4.700 5.100 3.800 4.000 5.800 6.200 1.270(BSC) 0.400 1.270 0° 8° 7 Dimensions In Inches Min Max 0.053 0.069 0.004 0.010 0.053 0.061 0.013 0.020 0.006 0.010 0.185 0.200 0.150 0.157 0.228 0.244 0.050(BSC) 0.016 0.050 0° 8° UTD Semiconductor Co.,Limited UMW R LM2674 DC-DC switching buck converter Ordering information Order code UMW LM2674M-3.3 UMW LM2674M-5.0 Package Baseqty Deliverymode SOP-8 SOP-8 2500 2500 Tape and reel Tape and reel UMW LM2674M-12 SOP-8 SOP-8 2500 Tape and reel 2500 Tape and reel UMW LM2674M-ADJ www.umw-ic.com 8 UTD Semiconductor Co.,Limited