Ordering number : ENA1475 Bi-CMOS IC LV5809MX Step-down Switching Regulator Overview LV5809MX 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 (200mil) 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 40µA 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 • 2.5A 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 (200mil) with Exposed Pad 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 BOOT pin-SW pin maximum voltage VBS-SW max EN pin maximum voltage VEN max FB, COMP, SS pin maximum voltage Vfs max Allowable power dissipation Pd max VIN max V 7 V 20 V Mount on a specified board * 7 V 2.05 W Junction temperature Tj max 150 °C Operating temperature Topr -20 to 80 °C Storage temperature Tstg -40 to 150 °C * Specified board: 46.4mm × 31.8mm ×1.7mm, glass epoxy both side. 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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. 52009 MS 20090507-S00003 No.A1475-1/5 LV5809MX Recommended Operating Conditions at Ta = 25°C Parameter Symbol Conditions Ratings Unit VIN pin voltage VIN 4.5 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 maximum VBS-SW 6.5 V EN pin maximum voltage VEN 18 V FB, COMP, SS pin voltage VFSO 6 V voltage Electrical Characteristics at Ta = 25°C, VIN = 12V, unless otherwise specified. Parameter Symbol Conditions Ratings min typ Unit max 40 µA 2 mA 90 % IC current drain at standby ICC1 EN=0V IC current drain in operation ICC2 EN=open Efficiency Effcy VIN=12V, IOUT=1A, Vo=5V, Design target *1 Reference voltage Vref VIN=4.5V to 18V (±2%) 0.8 +2% V FB pin bias current Iref FB=0.8V application 10 100 nA High-side ON resistance RonH BOOT=5V 0.2 Oscillation frequency fOSC Oscillation frequency during fOSCS -2% Ω 265 330 395 kHz 26 33 40 kHz 2.1 V short-circuit protection EN high-threshold voltage Venh EN low-threshold voltage Venl Maximum ON DUTY D max Current limit peak value 1 Ic1 VIN=12V, VOUT=5V, L=10µH 2.7 5.3 A Current limit peak value 2 Ic2 VIN=12V, VOUT=3.3V, L=10µH 3.0 5.6 A Current limit peak value 3 Ic3 VIN=12V, VOUT=1.2V, L=10µH 3.3 5.9 Thermal shutdown temperature Ttsd *Design guarantee *2 160 °C Thermal shutdown temperature Dtsd *Design guarantee *2 40 °C ISS SS=0V 0.8 V 80 % A hysteresis Soft start current 6 10 14 µA *1: Reference value (not tested before shipment) *2: Design guarantee (value guaranteed by design and not tested before shipment) No.A1475-2/5 LV5809MX Package Dimensions unit : mm (typ) 3372 TOP VIEW SIDE VIEW Allowable power dissipation, Pd max -- W 1.4 BOTTOM VIEW 5.0 (3.4) (2.6) 0.43 6.0 4.4 8 1 2 0.35 (0.65) 0.15 1.27 1.2 1.15 1.0 0.8 1.15 0.6 0.4 0.2 1.7 MAX 0 -20 0 20 40 60 80 100 Ambient temperature, Ta -- °C 0.05 (1.5) SIDE VIEW Pd max -- Ta Mounted on a specified board: 46.4×31.8×1.7mm3 glass epoxy both side 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 (3.3V output) BOOT (SW + Vreg.) BOOT VIN=12V + Current Sense Amp. Rb C2 C8 C1 Pre-Drive UVLO 1:N VOUT=3.3V SW L1 R10 OSC 330kHz R1 FB R3 + Error Amp. + PWM comparator D1 C4=OPEN R2 C9 GND COMP C3 C5 BOOT Short protect circuit SW COMP SS Internal Stable supply Short protect circuit VIN C6 EN H : ON Vref 0.8V TSD Internal Regulator Internal Regulator (5V) L or open : OFF • C1,C8,C5,C9 = ceramic capacitor used. No.A1475-3/5 LV5809MX Pin Function Pin No. 1 Pin name BOOT Function Equivalent circuit Upper MOS transistor boot strap capacitance connection pin. VIN Connect the boot capacitance of about 0.022µF between SW pins. To protect the SW pin’s absolute maximum rating, to ensure Short protection circuit stable operation, and to eliminate noise, the boot capacitance BOOT serial resistance (about 100Ω) Rb proves effective. 2 VIN Input voltage pin. Connect substantially large (10µF 2 parallel or more) Output MOS capacitance between this pin and GND. 3 SW Power switch pin. Connect the output LC filter. Connect the above capacitance SW between this pin and BOOT pin. 4 GND Ground pin. 5 FB 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 VIN Internal regulation line Example: 3.3V output voltage (See Block Diagram and Sample Application Circuit) VOUT = Vref × { 1 + (27k + 4.3k) } 10k 10µA =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 SS FB C6 can be set as follows: VREF 0.8V 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. Internal regulation line VIN Short protection circuit COMP 7 EN Enable pin. Converter enabled when set to the HIGH voltage and disabled VIN when LOW voltage or OPEN state. 5µA 1kΩ EN 183kΩ 2pF Q117 183kΩ No.A1475-4/5 LV5809MX 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. 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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 May, 2009. Specifications and information herein are subject to change without notice. PS No.A1475-5/5