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| CAT. No. TU83 Synchronous Rectification DC to DC Converter Power IC MD1421N IC igh wn Converter t Power and H ol Stepping Do M Contr es High Outpu od realiz fu n c ti o n in 3.3V/5V PW tification Meth n c e a n d h ig h Rec rm a Synchronous n g h ig h p e rf o 5 % ) in te g ra ti .9 E ff ic ie n c y (t y p age compact pack Summary MD1421N is a non-isolated, PWM control stepping down DC to DC converter power IC including main MOSFET switch and synchronous rectification MOSFET inside. It has maximum 15W ( 5V, 3A ) output power and high efficiency in wide range. It also has wide input voltage range ( 8 - 40V ) and it is possible to get 3.3V or 5V output voltage by selecting terminal. Its package is new compact surface mount type (SSOP-32) and it is possible to design DC to DC converter with fewer external components and smaller mounting area. Feature Input Voltage range 8-40V Maximum Output Current 3A Included main MOSFET switch and synchronous rectification MOSFET Output 3.3V / 5V (Selective with output switching terminal) High Efficiency typ. 95% (at:Vin=8V, Vout=5V, Iout=1A) Fixed Frequency 250kHz PWM Control Over Current Protection Function Low Input Voltage Protection Function (UVLO) Thermal Shut Down Function Remote control On / Off function Block Diagram Vref 28 Vcc 6 Vboot 8 VB 25 VGH 23 VDD 18~21 R/C 5 ON/OFF circuit BOOT Reference Vref=6.5V High side Vref=Vont+5.8V Higt side Driver TSD 3.3V F/B High-Low MOS synchro-OFF Error amp PWM Comp High-Low MOS synchro-ON Prevention 5.0V F/B 3V 1V Q R S Low side Driver Low side Vref=6.5V 2.5V VOUT 11~14 CLM Vth= 0.1~0.2V P.GND 16 27 32 30 1 2 3 4,26 9 3.3V/5V amp- ampOUT S/S F/B OCL- OCL+ GND VGL Application Example Pin Layout INPUT 8~40V Vboot VCC VDD amp OUT VB VOUT OUTPUT 3.3V or 5V MD1421N OCL+ F/B OCL- + ampVref 3.3V/5V GND 3.3V/5V SELECT S/S R/C P.GND + S/S : F/B OCL- : OCL+ : GND : R/C : Vcc : N/C : Vboot : VGL : N/C : VOUT : VOUT : VOUT : VOUT : N/C : P.GND : 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 : : : : : : : : : : : : : : : : ampN /C ampOUT N/C Vref 3.3V/5V GND VB N/C VGH N/C VDD VDD VDD VDD N/C ON GND GND Absolute Maximum Ratings ( Ta = 25 Item Line voltage Output MOS input voltage Output current ( A V E ) Output current ( P E A K ) Remote control voltage Storage temperature Junction temperature ) Symbol VIN VDD IOUTave IOUTpeak VRC Tstg Tj Rating 42 42 3 4 5.5 -40~150 150 Unit V V A A Recommended Operation Conditions Item Input voltage Operation temperature Recommerded Value 8~40 -10~80 ) Unit V Electrical Characteristics ( Ta = 25 Item HighsideMOS Drain-source breakdown voltage HighsideMOS Drain interruption current HighsideMOS Drain-source ON resistance HighsideMOS Source-drain Di forward voltage LowSideMOS Drain-source breakdown voltage LowSideMOS Drain interruption current LowSideMOS Drain-source ON resistance LowSideMOS Source-drain breakdown voltage Start voltage Stop voltage Start-stop voltage hysteresis Current consumption Current consumption with remote control OFF Voltage with remote control terminal ON Voltage with remote control terminal OFF Current with remote control terminals shorted BOOT terminal voltage Internal reference voltage Internal oscillation frequency Overcurrent threshold voltage SoftStart terminal current "H" CHG terminal input voltage "L" CHG terminal input voltage Overcurrent protection operating temperature Symbol Vdss Idss Ron VSD Vdss Idss Ron VSD Vcc_start Vcc_stop Vcc_hys Icc Icc_off VRC_on VRC_off IRC Vboot Vref fosc Vth_OCL IS/S VCHGH VCHGL T_TSD Condition ID= 1mA,VGS= 0V VDS= 40V,VGS= 0V ID= 1.2A,VGS= 4.5V IS= 1.2A,VDS= 0V ID= 1mA,VGS= 0V VDS= 40V,VGS= 0V ID= 1.2A,VGS= 4.5V IS= 1.2A,VDS= 0V - MIN 42 - TYP - MAX - Unit V - 10 70 1.5 - - 33 - - V V 42 - - - 10 70 1.5 8 7.5 - - 33 - - V V V V mA mA V V V V kHz V V V 7 6.5 -0.2 Vcc= 8~40V Vcc= 8V~40V Vcc= 8V~40V Vcc= 8V~40V Vcc= 8V~40V Vcc= 24V Vcc= 8V~40V Vcc= 24V Vcc= 24V Vcc= 24V - 7.5 7 0.5 10 1.2 - 2.5 - 6 4.75 212.5 0.162 -20 6.5 5 250 0.19 -12.5 - 12 1.5 0.5 5.3 250 7 5.25 287.5 0.218 -5 4.5 GND - Vref 0.5 - 150 Outline Dimensions The level of quality of our products shown in this catalog is intended for use in standard applications requiring ordinary reliability. In the case these products are to be used in equipment or devices for special or specific applications requiring extremely high levels of quality and reliability in which failure or malfunction of a product may directly affect human life or health, always make sure to obtain confirmation by contacting our firm in advance. The quality levels of our products are classified in the manner shown below, Standard Applications Computers, OA and other office equipment, communication terminal equipment, measuring instruments, AV equipment, amusement equipment, home appliances, machine tools, personal equipment, industrial robots, etc. Special Applications Transportation equipment (automotive, marine, etc.), trunk line communication equipment, traffic signal equipment, fire prevention/anti-theft equipment, various safety devices, health care equipment, etc. Specific Applications Nuclear power control systems, aeronautical equipment, aerospace equipment, submarine relay equipment, devices and systems for preserving life, etc. Although efforts are constantly made to improve quality and reliability, please select a product after careful examination so that personal injury, accidents and social damage can be prevented as a result of deploying measures such as a redundant design, designs that prevent the spreading of fire, designs that prevent malfunctions and so forth while taking safety into consideration as necessary. * All specifications are subject to change without notice. Please note that the information contained in this catalog may change for improvement or other purpose without notice. Issued: October 2000 Export regulations of strategic materials, etc. This product is classified as the integrated circuit specified in Item 7 in the Attached Table No. 1 to the Export Trade Control Order and in Article 6 of the Ordinance of the Ministry of International Trade and Industry. This product is subject to the KNOW regulation. October 2000 Shindengen America, Inc. Head Office 2985 E. Hillcrest Drive, Suite 140 Westlake Village, CA91362, U.S.A. Phone:(1)-805-373-1130 Fax:(1)-805-373-3710 Chicago Office 411 Business Center Drive, Suite 112 Mt. Prospect, IL 60056 U.S.A. Phone:(1)-847-827-7100 Fax:(1)-847-827-7122 SHINDENGEN ELECTRIC MFG. CO., LTD. Ikebukuro office: RECRUIT Ikebukuro Bldg., 1-13-23, Minami-Ikebukuro, Toshima-ku, Tokyo 171-0022, Japan Phone : ( 81)-03-5951-8106 Fax : ( 81)-03-5951-8099 Printed in japan 00O30 (NP) Shindengen UK Ltd. Howard Court, 12 Tewin Road, Welwyn Garden City, Hertfordshire. AL7 IBW Phone:(44)-1707-332-992 Fax:(44)-1707-332-955 German Representative Office Kaiser-Strasse 25, D-40479 Dusseldorf, Germany Phone:(49)-211-491968-0 Fax:(49)-211-4986499 |
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