LV5803M

Ordering number : ENA1047 Bi-CMOS IC LV5803M Overview Step-down Switching Regulator LV5803M is a 1ch step-down switching regulator. 0.2Ω FET is incorporated on the upper side to achieve high-efficiency operation for large output current. Low-heat resistance and compact-package MFP8 employed. Current mode control type, with superior load current response and easy phase compensation ON/OFF pin, allowing the standby mode with the current drain of 80µA 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 (4.5 to 18V) • High efficiency (90% IOUT = 1A, VIN = 12V, VO = 5V) • Standby mode • Over-current protection • Thermal shutdown • Reference voltage: 0.8V • Fixed frequency: 330kHz • Soft start • Compact package: MFP8 (225mil) 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 With specified substrate * Conditions Ratings 20 25 VIN max 7 20 7 1.15 150 -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 pin maximum voltage FB, COMP, SS pin maximum voltage Allowable power dissipation Junction temperature Operating temperature Storage temperature * Specified substrate: 46.4mm × 31.8mm ×1.7mm, 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. 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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. 13108 MS PC 20080124-S00006 No.A1047-1/5 LV5803M Recommended Operating Conditions at Ta = 25°C Parameter VIN pin voltage BOOT pin voltage SW pin voltage BOOT pin-SW pin maximum voltage EN pin maximum voltage FB, COMP, SS pin voltage VEN VFSO 18 6 V V Symbol VIN VBT VSW VBS-SW Conditions Ratings 4.5 to 18 -0.3 to 23 -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 Oscillation frequency Oscillation frequency during short-circuit protection EN high-threshold voltage EN low-threshold voltage EN pull-up current Maximum ON DUTY Current limit peak value 1 Current limit peak value 2 Current limit peak value 3 Thermal shutdown temperature Thermal shutdown temperature hysteresis Soft start current ISS SS=0V 6 10 14 µA *1: Reference value (not tested before shipment) *2: Design guarantee (value guaranteed by design and not tested before shipment) Venh Venl Ien D max Ic1 Ic2 Ic3 Ttsd Dtsd VIN=12V, VOUT=5V, L=10µH VIN=12V, VOUT=3.3V, L=10µH VIN=12V, VOUT=1.2V, L=10µH *Design guarantee *2 *Design guarantee *2 2.5 2.8 3.1 160 40 EN=0V 1.25 0.95 1.55 1.25 45 86 5.3 5.6 5.9 1.85 1.55 V V µA % A A A °C °C Symbol ICC1 ICC2 Effcy Vref Iref RonH fOSC fOSCS EN=0V EN=open VIN=12V, IOUT=1A, Vo=5V, Design target *1 VIN=4.5V to 18V (±2%) FB=0.8V application BOOT=5V 265 26 -2% Conditions Ratings min typ 80 2 90 0.8 10 0.20 330 33 395 40 +2% 100 max Unit µA mA % V nA Ω kHz kHz No.A1047-2/5 LV5803M Package Dimensions unit : mm (typ) 3032D 1.4 Pd max -- Ta Mounted on a specified board: 46.4×31.8×1.7mm3 glass epoxy board 5.0 8 5 Allowable power dissipation, Pd max -- W 1.2 1.15 1.0 4.4 6.4 0.8 0.64 0.63 0.6 1 (0.65) 1.27 4 0.35 0.15 0.4 (1.5) 1.7max 0.2 0 -20 0 20 40 60 80 100 0.1 Ambient temperature, Ta -- °C SANYO : MFP8(225mil) Pin Assignment BOOT 1 VIN 2 SW 3 GND 4 Top view 8 SS 7 EN 6 COMP 5 FB Block Diagram and Sample Application Circuit (3.3V output) BOOT (SW + Vreg.) BOOT VIN=12V C2=10µF/25V L1=10µH + UVLO R10=4.3kΩ R1=27kΩ Current Sense Amp. Pre-Drive 1:N Rb= 39Ω C1= 0.022µF SW D1=SBM30-03 VOUT=3.3V Ro=open OSC 330kHz FB + Error Amp. + PWM comparator C5=10µF/10V ×3 R3=10kΩ COMP C4=OPEN GND BOOT Short protect circuit COMP SW R2=10kΩ C3= 1500pF SS C6= 0.015µF open or H:ON L :OFF Internal Stable supply VIN Vref 0.8V TSD Internal Regulator Short protect circuit Internal Regulator (5V) EN • C1, C8, C5 = ceramic capacitor used. • L1 = CDRH105RPN-100NC (sumida made) No.A1047-3/5 C8=10µF/25V LV5803M Pin Function Pin No. 1 Pin name BOOT pin. Connect the boot capacitance of about 0.022µF 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. 2 VIN Input voltage pin. Connect substantially large (10µF 2 parameters or more) capacitance between this pin and GND. 3 SW Power switch pin. Connect the output LC filter. Connect the above capacitance between this pin and BOOT pin. 4 5 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 Vref = 0.8V Example: 3.3V output voltage (See Block Diagram and Sample Application Circuit) VOUT = Vref × { 1 + =3.304V 8 SS 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 × 0.8V = 0.015µF 6 COMP Phase compensation pin. Connects with the phase compensation external capacitance and resistance of DC/DC converter close loop. (27k + 4.3k) } 10k 10µA Short protection circuit Function Upper MOS transistor boot strap capacitance connection Equivalent circuit VIN BOOT Output MOS SW VIN Internal regulation line SS VREF 0.8V FB VIN Internal regulation line Short protection circuit COMP 7 EN Enable pin. Converter enabled when set to the HIGH voltage or OPEN state and disabled when connected to GND. VIN 5µA EN 1kΩ 93kΩ Q117 93kΩ 2pF No.A1047-4/5 LV5803M Considerations for the design • During use with VIN = 12V or less, the boot strap voltage may become deficient due to intermittent operation at no load, resulting in failure of normal operation. In this case, insert a resistance of about 500Ω between VOUT and GND and avoid the intermittent operation mode during use. • 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. 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 January, 2008. Specifications and information herein are subject to change without notice. PS No.A1047-5/5