LV58761MX

Ordering number : ENA1964 Bi-CMOS IC LV58761MX Overview Step-down Switching Regulator LV58761MX is a 1ch step-down switching regulator. With built-in 0.25Ω power MOSFET switch, it achieves high output current and high efficiency. With low-heat resistance, miniature package MFP8J (200mil) with heat-sink is adopted. Since it is Current mode control type, it has good load current response, and phase compensation is easy. With ON/OFF pin, operating can be less than 60μA at stand-by mode. It has cycle-by-cycle over current protection for load devices. With external capacitor, it achieves soft start. Functions • 1.5A 1ch step-down regulator • Small package: MFP8J (200mil) with heat sink • High efficiency (88% IOUT = 1A, VIN = 12V, VO = 5V) • Standby mode • Over-current protection • Thermal shutdown protection • Reference voltage: 0.8V • Inside frequency: 950kHz • Soft start • Wide input dynamic range (4.75 to 18V) Specifications Parameter Maximum Ratings at Ta = 25°C Symbol VIN max VBT max VSW max VBS-SW max VEN max Vfs max Pd max Tj max Topr Tstg Mount on a specified board *1 Conditions Ratings 20 25 VIN max 7 20 7 1.25 150 -20 to 80 -40 to 150 Unit V V V V V V W °C °C °C Maximum input VIN voltage BOOT pin maximum voltage SW pin maximum voltage BOOT pin-SW pin maximum voltage EN Maximum Voltage FB, COMP, SS pin maximum voltage Allowable power dissipation Junction temperature Operating temperature Storage temperature *1: 46.4mm х 31.8mm х 1.7mm Four layers glass epoxy substrate. Note: Plan the maximum voltage while including coil and surge voltages, so that the maximum voltage is not exceeded even for an instant. Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment (home appliances, AV equipment, communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. 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To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer' s products or equipment. 70611 SY 20110606-S00003 No.A1964-1/7 LV58761MX Recommended Operating Conditions at Ta = 25°C Parameter VIN pin voltage BOOT pin voltage SW pin voltage BOOT pin-SW pin voltage EN voltage FB, COMP, SS pin voltage VIN VBT VSW VBS-SW VEN VFSO Symbol Conditions Ratings 4.75 to 18 -0.3 to 23 -0.4 to VIN 6.5 18 6 Unit V V V V V V Electrical Characteristics at Ta = 25°C, VIN = 12V Parameter IC current drain at standby IC current drain in operation Efficiency Reference voltage FB pin bias current High-side ON resistance Oscillation frequency Oscillatory frequency when short-circuit is protected EN high-threshold voltage EN low-threshold voltage Maximum ON DUTY SW Peak Current limit 1 SW Peak Current limit 2 SW Peak Current limit 3 Thermal shutdown temperature Thermal shutdown temperature hysteresis Soft start current UVLO threshold voltage UVLO hysteresis ISS VUVLO VHYS SS=0V VIN Rising 3 3.9 5 4.2 0.2 7 4.5 μA V V VENH VENL D max Icl1 Icl2 Icl3 Ttsd Dtsd VIN=12V, VOUT=1.2V, L=2.2μH VIN=12V, VOUT=3.3V, L=2.2μH VIN=12V, VOUT=5V, L=2.2μH *Design guarantee *3 *Design guarantee *3 3.1 2.8 2.5 160 40 0.9 0.7 1.8 1.35 80 5.7 5.4 5.1 2.7 2.0 V V % A A A °C °C Symbol ICC1 ICC2 Effcy Vref Iref RonH fOSC fOSCS EN=0V EN=5v, FB=1V VIN=12V, IOUT=1A, Vo=5V, Design target *2 VIN=4.75V to 28V FB=0.8V BOOT=5V, IOUT=1A : *4 760 255 -2% Conditions Ratings min typ 60 2.3 88 0.8 20 0.25 950 340 1140 425 +2% 200 max 80 3.1 Unit μA mA % V nA Ω kHz kHz *2: Reference value (not tested IC unit) *3: Design guarantee (value guaranteed by design and not tested IC unit) *4: Value in state of substrate mounting. Pin Assignment BOOT 1 VIN 2 SW 3 GND 4 Top view 8 SS 7 EN 6 COMP 5 FB No.A1964-2/7 LV58761MX Package Dimensions unit : mm (typ) 3411 5.0 8 1.5 Pd max -- Ta 1.25 Allowable power dissipation, Pd max -- W 1.2 4.4 6.0 0.9 0.43 1 (0.6) 2 0.35 1.27 SIDE VIEW 0.15 0.7 0.6 0.3 (1.5) 1.7 MAX 0 -20 0 20 40 60 80 100 Ambient temperature, Ta -- C 0.05 SANYO : MFP8J(200mil) Specified Board [IC，Small signal part side] Specified Board [coil，Schottky part side] Block Diagram and Sample Application Circuit BOOT VIN EN High : ON Low or OPEN : OFF 1 2 VIN VIN=12V 7 Internal Regulator UVLO + OSC 1MHz Internal Regulator PreDrive PWM comparator 0.25 Slope comp + Error Amp +D1 + - Output logic 3 SW VOUT=3.3V FB 5 COMP C3=560pF 6 4 GND SS 8 Vref 0.8V TSD Pin-Short protection L1:NR5040T 2R2N[TAIYO YUDEN] C2:GRM31CB31E106KA75[MURATA] C5,C9:C2012JBOJ106M[TDK] C :Ceramic Capacitor No.A1964-3/7 LV58761MX Pin Function Pin No. 1 Pin name BOOT Function Upper MOS transistor boot strap capacitance connection pin. Connect the boot capacitance of about 0.022uF between SW pins. To protect the SW pin’s absolute maximum rating , to ensure stable operation, and to eliminate noise , the boot capacitance serial resistance (about 100Ω) Rb proves effective. Input Voltage Pin. Connect substantially large (10uF more) capacitance between this pin and GND. Power Switch pin. Connect the output LC filter. Connect the above capacitance between this pin and BOOT pin. Equivalent circuit Short protection circuit VIN BOOT 2 3 VIN SW Output MOS SW 4 5 GND FB Ground pin. Feedback pin. Set the output voltage by means of split resistor in the section of the output voltage VOUT-FB-GND. VOUT setting is made as calculated below. VOUT = Vref × { 1 + (R1 + R10) } R3 Vref = 0.8V Example: 3.3V output voltage (See, Block Diagram and Application example) VOUT = 0.8 × { 1 + (27k + 4.3k) } 10k VIN Internal Regulation line 8 SS =3.304V Soft start pin. Sets the soft start time by means of the built-in 5μA source voltage and external soft start capacity. The soft start capacity CSS can be set as follows: Tss CSS = 5μA × Vref Where, Tss is the soft start time and Vref is the reference voltage. Example:2.4ms soft start time achieved 2.4ms CSS = 5μA × 0.8V = 0.015μF SS VREF 0.8V FB 6 COMP Phase compensation pin. Connects with the phase compensation external capacitance and resistance of DC/DC converter close loop. VIN Internal Reguretion line Short protection circuit COMP 7 EN Enable pin. Converter enabled when set to the HIGH voltage and disabled when GND or OPEN state. VIN EN No.A1964-4/7 LV58761MX Reference data (1) 80 ICC1 -- Ta IC current drain in operation, ICC2 -- mA VIN = 12V EN = 0V 2.5 ICC2 -- Ta VIN = 12V EN = 3V FB = 1V 70 2.4 60 2.3 50 2.2 40 2.1 30 --40 --20 0 20 40 60 80 100 2.0 --40 --20 0 20 40 60 80 100 Ambient temperature, Ta -- C 820 815 Vref -- Ta VIN = 12V FB pin bias current, Iref -- nA Ambient temperature, Ta -- C 50 45 40 35 30 25 20 15 10 5 Iref -- Ta VIN = 12V FB = 0.8V Reference voltage, Vref -- mV 810 805 800 795 790 785 780 --40 --20 0 20 40 60 80 100 120 140 0 --40 --20 0 20 40 60 80 100 Ambient temperature, Ta -- C 1040 Ambient temperature, Ta -- C 90 FOSC -- Ta VIN = 12V Maximum ON DUTY, D max -- % D max -- Ta VIN = 12V Oscillation frequency, FOSC -- kHz 1020 1000 980 960 940 920 900 880 --40 85 80 --20 0 20 40 60 80 100 75 --40 --20 0 20 40 60 80 100 Ambient temperature, Ta -- C 360 Ambient temperature, Ta -- C 7.0 6.5 FOSCS -- Ta ISS -- Ta VIN = 12V SS = 0V VIN = 12V Oscillation frequency during short-circuit protection, FOSCS -- kHz 350 6.0 5.5 5.0 330 4.5 4.0 320 3.5 310 --40 3.0 --40 340 --20 0 20 40 60 80 100 --20 0 20 40 60 80 100 Ambient temperature, Ta -- C Ambient temperature, Ta -- C PS No.A1964-5/7 LV58761MX 2.8 Venh -- Ta VIN = 12V 2.6 Venl -- Ta VIN = 12V EN high-threshold voltage, Venh -- V EN low-threshold voltage, Venl -- V --20 0 20 40 60 80 100 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 --40 0.6 --40 --20 0 20 40 60 80 100 Ambient temperature, Ta -- C 5.5 Ambient temperature, Ta -- C 6.0 Icl -- Ta Current Limit 5.0 5.0 Current limit peak, Icl -- A 4.5 VOUT = 1.2V Output voltage, VOUT -- V 4.0 4.0 3.3V 5.0V 3.0 3.5 2.0 3.0 1.0 2.5 --40 --20 0 20 40 60 80 100 0.0 0.0 1.0 2.0 3.0 4.0 Ambient temperature, Ta -- C 95 Load current -- A 5.08 Efficiency -- Load current VIN = 12V VOUT = 5V Load Regulation VIN = 12V VOUT = 5V 5.04 90 Efficiency -- % -30 C Ta = 9 0 C 25 C Output voltage, VOUT -- V 5.00 4.96 Ta = 90 C 25 C -30 C 85 4.92 80 0.0 0.5 1.0 1.5 4.88 0.0 0.5 1.0 1.5 2.0 Load current -- A Load current -- A Reference data (2) (* measurement circuit is shown in “Block Diagram and Sample Application circuit”) •Output voltage lipple ILoad=0.5A [1.0usec/div] •Load transient response ILoad = 0.5A ⇔ 1.5A [100μsec/div] CH3:Vout [20mV/div] CH3:Vout [20mV/div] CH4:ILoad [0.5A/div] CH4:ILoad [1.0A/div] PS No.A1964-6/7 LV58761MX •VIN start up waveform Rload = 6Ω [1msec/div] CH1:VIN [10V/div] •VIN stop waveform Rload = 6Ω [1msec/div] CH1:VIN [10V/div] CH2:SS [1.0V/div] CH2:SS [1.0V/div] CH3:Vout [2.0V/div] CH3:Vout [2.0V/div] •EN start up waveform Rload = 6Ω [1msec/div] CH1:EN [5/div] CH2:SS [1.0V/div] CH3:Vout [2.0V/div] •EN stop waveform Rload = 6Ω [1msec/div] CH1:EN [5V/div] CH2:SS [1.0V/div] CH3:Vout [2.0V/div] Considerations for the design • When VIN=12V or less is used, boot strap voltage shortage because of intermittent operation at a no load might happen, and it not operate normally. The load of about 500Ω is put between VOUT-GND, and in that case, avoid and use an intermittent mode. • Insertion of serial beads in the Schottky diode for removal of noise may cause generation of the negative voltage deviating from the absolute maximum rating at the SW pin, resulting in failure of normal operation. In such an event, do not insert beads as above described and, instead, remove noise by means of the BOOT resistance Rb SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein. SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require the export license from the authorities concerned in accordance with the above law. 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SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. This catalog provides information as of July, 2011. Specifications and information herein are subject to change without notice. PS No.A1964-7/7