Ordering number : ENA1639 Bi-CMOS IC LV5856MX Step-down Switching Regulator Overview LV5856MX is a 1ch step-down switching regulator. With built-in two 0.13Ω power MOSFET switch, it achieves high output current and high efficiency. With low-heat resistance, miniature package MFP8 (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 • 3A 1ch step-down • Small package: MFP8 (200mil) with heat sink • High efficiency (93% IOUT = 1A, VIN = 12V, VO = 5V) • Standby mode • Over-current protection(HICCUP) • Thermal shutdown protection • Reference voltage: 0.923V • Fixed frequency: 340kHz • Soft start / Soft stop Specifications Maximum Ratings at Ta = 25°C Parameter Symbol Conditions Ratings Unit Maximum input VIN voltage VIN max 20 V BOOT pin maximum voltage VBT max 25 V SW pin maximum voltage VSW max VIN max V BOOT pin-SW pin maximum voltage VBS-SW max EN Maximum Voltage VEN max 7 V 20 V FB, COMP, SS pin maximum voltage Vfs max Allowable power dissipation Pd max Junction temperature Tj max 150 °C Operating temperature Topr -20 to 80 °C Storage temperature Tstg -40 to 150 °C Mount on a specified board * 7 V 2.05 W Specified substrate : 46.0mm х 32.0mm х 1.6mm 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. 12910 SY 20091216-S00006 No.A1639-1/5 LV5856MX Recommended Operating Conditions at Ta = 25°C Parameter Symbol Conditions Ratings Unit VIN pin voltage VIN 8 to 18 BOOT pin voltage VBT -0.3 to 23 V V SW pin voltage VSW -0.4 to VIN V BOOT pin-SW pin voltage VBS-SW 6.5 V EN voltage VEN 18 V FB, COMP, SS pin voltage VFSO 6 V Electrical Characteristics at Ta = 25°C, VIN = 12V, unless otherwise specified. Parameter Symbol Conditions Ratings min typ Unit max IC current drain at standby ICC1 EN=0V 60 μA IC current drain in operation ICC2 EN=5v, FB=1V 2.5 mA Efficiency Effcy VIN=12V, IOUT=1A, Vo=5V, Design target *2 93 Reference voltage Vref VIN=8V to 28V (±2%) FB pin bias current Iref FB=0.923V High-side ON resistance RonH BOOT=5V, IOUT=1A Low-side ON resistance -2% % 0.923 +2% V 10 100 nA 0.13 Ω RonL 0.13 Ω Oscillation frequency fOSC 340 kHz Oscillation frequency during fOSCS 100 kHz short-circuit protection EN high-threshold voltage Venth Maximum ON DUTY D max 1.5 V Minimum ON DUTY D min SW Peak Current limit Icl1 VIN=12V, VOUT=5V, L=10μH Thermal shutdown temperature Ttsd *Design guarantee *3 160 °C Thermal shutdown temperature Dtsd *Design guarantee *3 40 °C Soft start current ISS SS=0V 6 μA Discharge On-Resistance VSWON 35 Ω VIN UVLO lock voltage VUVLOL 6.0 V VIN UVLO lock release voltage VUVLOH 6.9 V 80 % 8 4 % A hysteresis *2: Reference value (not tested before shipment) *2: Design guarantee (value guaranteed by design and not tested before shipment) No.A1639-2/5 LV5856MX Package Dimensions unit : mm (typ) 3372 Pd max -- Ta 2.5 SIDE VIEW BOTTOM VIEW 5.0 Allowable power dissipation, Pd max -- W TOP VIEW (3.4) (2.6) 0.43 6.0 4.4 8 1 2 0.35 (0.65) 0.15 1.5 1.15 1.0 0.5 0 -20 0 20 40 60 80 100 Ambient temperature, Ta -- ∞C 0.05 (1.5) SIDE VIEW 1.7 MAX 1.27 2.05 2.0 SANYO : MFP8(200mil) Pin Assignment BOOT 1 8 SS VIN 2 7 EN SW 3 6 COMP GND 4 5 FB Top view Block Diagram and Sample Application Circuit BOOT (SW + Vreg.) BOOT VIN Current Sense Amp. + Rb Pre-Drive UVLO FB 1:N OSC 340kHz + Error Amp. + PWM comparator GND C4=OPEN 117% EN H : ON EN UVLO TSD OVP SS VOUT Pre-Drive COMP C3 SW + - Internal Stable supply Vref 0.923V Current Limit VIN TSD Soft-Stop Internal Regulator Internal Regulator (5V) L : OFF C1,C2,C5,C8,C9=Ceramic capacitor No.A1639-3/5 LV5856MX Pin Function Pin No. 1 Pin name BOOT 2 VIN 3 SW Function Equivalent circuit Upper MOS transistor boot strap capacitance connection pin. Connect the boot capacitance of about 0.1uF 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 15Ω) Rb proves effective. Input Voltage Pin. Connect substantially large (10uF 2 parallel or 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. The discharge transistor for a Soft-Stop is connected with this terminal (typcal 35Ω). It turns it on by either EN=L, UVLO or a thermal shutdown. 4 GND Ground pin. 5 FB 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 = 0.923V VIN BOOT High side MOS SW Low side MOS Discharge VIN Example: 3.3V output voltage (See, Block Diagram and Application example) VOUT = 0.923 × { 1 + 8 SS (22k + 3.9k) } 10k =3.314V Soft start pin. Sets the soft start time by means of the built-in 6μA source voltage and external soft start capacity. The soft start capacity C6 can be set as follows: SS FB Tss C6 = 6μA × Vref VREF 0.923V Where, Tss is the soft start time and Vref is the reference voltage. Example:2.3ms soft start time achieved 2.3ms C6 = 6μA × 0.923V = 0.015μF 6 COMP Phase compensation pin. Connects with the phase compensation external capacitance and resistance of DC/DC converter close loop. VIN COMP 7 EN Enable pin. Converter enabled when set to the HIGH voltage and disabled when LOW voltage or OPEN state. VIN EN 2pF No.A1639-4/5 LV5856MX 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 January, 2010. Specifications and information herein are subject to change without notice. PS No.A1639-5/5