LV5818M

Ordering number : ENA1900 Bi-CMOS IC LV5818M Overview Step-down Switching Regulator LV5818M is a 1ch step-down switching regulator. 0.3Ω FET is incorporated on the upper side to achieve high-efficiency operation for large output current. Low-heat resistance and compact-package MFP12 employed. Current mode control type, with superior load current response and easy phase compensation EN pin, allowing the standby mode with the current drain of 70μA or less Pulse-by-pulse over-current protection and overheat protection available for protection of load devices Soft start pin to be provided with a capacitance for soft start. Functions • 2A 1ch step-down switching regulator • Wide input dynamic range ( to 28V) • High efficiency (90% IOUT = 1A, VIN = 12V, VO = 5V) • Standby mode • Over-current protection • External synchronous driving • Thermal shutdown • Reference voltage: 0.8V • The frequency is changeable in external resistance. • Soft start • Compact package: MFP12 Specifications Parameter Maximum Ratings at Ta = 25°C Symbol VIN max VBT max VSW max VBS-SW max Vfs max Pd max Tj max Topr Tstg Mount on a specified board * Conditions Ratings 32 37 VIN max 7 7 1.65 150 -20 to 80 -40 to 150 Unit 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 FB, EN, COMP, SS, SYNC, RT pin maximum voltage Allowable power dissipation Junction temperature Operating temperature Storage temperature * Specified board: 46.4mm × 31.8mm ×1.7mm, glass epoxy both side. 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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D0810 SY 20101130-S00002 No.A1900-1/6 LV5818M Recommended Operating Conditions at Ta = 25°C Parameter VIN pin voltage BOOT pin voltage SW pin voltage BOOT pin-SW pin maximum voltage FB, EN, COMP, SS, SYNC, RT pin voltage Operating frequency FOSC 60k to 1M Hz VFSO 6 V VIN VBT VSW VBS-SW Symbol Conditions Ratings 8 to 28 -0.3 to 34 -0.4 to VIN 6.5 Unit V V V V Electrical Characteristics at Ta = 25°C, VIN = 12V, unless otherwise specified. Parameter IC current drain at standby IC current drain in operation Efficiency Reference voltage FB pin bias current High-side ON resistance Low-side ON resistance Oscillation frequency Oscillation frequency during short-circuit protection EN high-threshold voltage EN low-threshold voltage EN pull up current SYNC pin threshold High-voltage SYNC pin threshold Low-voltage Maximum ON DUTY Current limit peak value Thermal shutdown temperature Thermal shutdown temperature hysteresis Soft start current VsyncL D max Icl1 Ttsd Dtsd ISS VIN=12V, VOUT=5V, L=10μH *Design guarantee *2 *Design guarantee *2 SS=0V 6 3 160 40 10 14 0.8 80 V % A °C °C μA Symbol ICC1 ICC2 Effcy Vref Iref RonH RonL fOSC fOSCS Venh Venl Ien VsyncH EN = 0V 0.8 16 2.6 RT=100kΩ RT=100kΩ 290 48 EN=0V EN=OPEN VIN=12V, IOUT=1A, Vo=5V, RT=100kΩ Design target *1 VIN=8V to 28V (±2%) FB=0.8V application BOOT=5V -2% Conditions Ratings min typ 70 5 90 0.8 10 0.3 6 325 60 360 72 1.9 +2% 100 max Unit μA mA % V nA Ω Ω kHz kHz V V μA V *1: Reference value (not tested before shipment) *2: Design guarantee (value guaranteed by design and not tested before shipment) Pin Assignment BOOT 1 VIN 2 VIN 3 SW 4 SW 5 GND 6 Top view 12 SYNC 11 RT 10 SS 9 EN 8 COMP 7 FB No.A1900-2/6 LV5818M Package Dimensions unit : mm (typ) 3384 Allowable power dissipation, Pd max -- W TOP VIEW 5.0 12 SIDE VIEW BOTTOM VIEW (3.4) 2.0 Pd max -- Ta Mounted on a specified board: 46.4×31.8×1.7mm3 glass epoxy both side 1.65 (2.6) 4.4 6.4 1.0 0.92 1 2 0.8 0.3 0.15 (0.5) 1.7 MAX 0.63 0 -20 0 20 40 60 80 100 SIDE VIEW (1.5) Ambient temperature, Ta -- C 0.05 SANYO : MFP12S(225mil) Block Diagram and Sample Application Circuit (3.3V output) BOOT (SW + Vreg.) BOOT UVLO SYNC RT Pre-Drive 1:N + Error Amp. + PWM comparator Pre-Drive SW D1=SBM30-03 VIN=12V + Current Sense Amp. VOUT=3.3V OSC FB COMP C4=OPEN + Current Limit Comparator GND C3= 6800pF SS EN H : ON or OPEN L : OFF Internal Stable supply Vref 0.8V VIN TSD Internal Regulator Internal Regulator (5V) C1,C8,C5,C9 = Ceramic capacitor L1 = CDRH105RNP-100NC (sumida) No.A1900-3/6 LV5818M Pin Function Pin No. 1 Pin name BOOT Function Upper MOS transistor boot strap capacitance connection pin. Connect the boot capacitance of about 0.01μF 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 10Ω) Rb proves effective. Input voltage pin. Connect substantially large (20μF 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 VIN BOOT 2,3 VIN Hi side MOS 4,5 SW SW Low side MOS GND 6 7 GND FB Ground pin. Feedback pin. Sets 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 VIN Vref = 0.8V Example: 3.3V output voltage (See Block Diagram and Sample Application Circuit) VOUT = 0.8 × { 1 + 10 SS (27k + 4.3k) } 10k internal regulation line =3.304V Soft start pin. Sets the soft start time by means of the built-in 10μA source voltage and external soft start capacity. The soft start capacity C6 can be set as follows: Tss C6 = 10μA × Vref Where, Tss is the soft start time and Vref is the reference voltage. Example: 1.2ms soft start time achieved 1.2ms C6 = 10μA × 0.8 V = 0.015μF SS VREF 0.8V FB 8 COMP Phase compensation pin. Connects with the phase compensation external capacitance and resistance of DC/DC converter close loop. VIN internal reguration line COMP Clamp circuit 7 EN Enable pin. Converter enabled when set to the HIGH voltage and disabled when LOW voltage or OPEN state. VIN EN 2pF Q117 Continued on next page. No.A1900-4/6 LV5818M Continued from preceding page. Pin No. 11 Pin name RT Function RT pin. To set the frequency, resistance is connected. Equivalent circuit VIN RT 12 SYNC SYNC pin. The external cycle clock is impressed. VIN SYNC Considerations for the design 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. Please set the internal frequency decided by the terminal RT about 50kHz lower than an external input frequency when you use the external cycle function. PS No.A1900-5/6 LV5818M Reference data 1000 900 RT - Freq Oscllatory frequency , Freq - kHz 800 700 600 500 400 300 200 100 0 10 100 1000 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. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written consent of SANYO Semiconductor Co.,Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO Semiconductor Co.,Ltd. product that you intend to use. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. Upon using the technical information or products described herein, neither warranty nor license shall be granted with regard to intellectual property rights or any other rights of SANYO Semiconductor Co.,Ltd. or any third party. 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 December, 2010. Specifications and information herein are subject to change without notice. PS No.A1900-6/6