Ordering number : ENA1759A Bi-CMOS LSI LV5747NTT 1-channel Step-down Switching Regulator Overview The LV5747NTT is a 1-channel step-down switching regulator. Functions • 1 channel step-down switching regulator controller. • Frequency decrease function at pendent. • Load-independent soft start circuit. • ON/OFF function. • Built-in pulse-by-pulse OCP circuit. It is detected by using ON resistance of an external MOS. Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Allowable pin voltage Supply voltage Symbol Conditions VIN max Ratings Unit 45 V VIN, SW 45 V HDRV, CBOOT 52 V LDRV 6.0 V Between CBOOT to SW 6.0 V Between CBOOT to HDRV EN, ILIM Between VIN to ILIM VDD SS, FB, COMP Mounted on a specified board. * VIN+0.3 V 1.0 V 6.0 V VDD+0.3 V 0.75 W Allowable Power dissipation Pd max Operating temperature Topr -40 to +85 °C Storage temperature Tstg -55 to +150 °C * Specified board : 35mm × 32mm × 1.6mm, glass epoxy 2-layer board. 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. If you should intend to use our products for applications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer' s products or equipment. 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. 60910 SY/60210 SY PC 20100517-S00001 No.A1759-1/5 LV5747NTT Recommended Operating Range at Ta = 25°C Parameter Symbol Conditions Ratings Unit Supply voltage range VIN 8.0 to 42 V Error amplifier input voltage VFB 0 to 1.6 V Electrical Characteristics at Ta = 25°C, VIN = 24V Parameter Symbol Conditions Ratings min typ Unit max Reference voltage block Internal reference voltage Vref Including offset of E/A 5V power supply VDD IOUT = 0 to 5mA 0.698 0.708 0.718 V 4.7 5.2 5.7 V 260 300 340 kHz Triangular waveform oscillator block Oscillation frequency FOSC Frequency variation FOSC DV VIN = 8 to 42V Oscillation frequency fold back VOSC FB FB voltage detection after SS ends FOSC FB VFB = 0V IC start-up EN voltage VEN on VIN = 8 to 42V IC off EN voltage VEN off 1 % 0.5 V detection voltage Oscillation frequency after fold back 25 45 60 kHz 3.4 4.3 V ON/OFF circuit block 1.1 1.3 4 5 V Soft start circuit block ISS SC EN > 4.3V Soft start sink current ISS SK EN < 1V, VDD = 5V Soft start end voltage VSS END 0.9 1.1 1.3 UVLO lock release voltage VUVLO 7.0 7.4 7.8 UVLO hysteresis VUVLO H Soft start source current 6 2 μA mA V UVLO circuit block 0.6 V V Error amplifier Input bias current IEA IN Error amplifier gain GEA Common mode input range VEA R 1000 VIN = 8 to 42V Sink output current IEA OSK FB = 1.0V Source output current IEA OSC FB = 0V Current detection amplifier gain GISNS 1400 0.0 100 nA 1800 μA/V 1.6 V -100 μA 100 μA 1.3 over current limiter circuit block Reference current ILIM Over current detection comparator VLIM OFS +10% μA -5 +5 mV VIN-0.45 VIN V -10% 20 offset voltage Over current detection comparator common mode input range PWM comparator Input threshold voltage Maximum ON duty Vt max Duty cycle = DMAX, SW = VIN 1.0 1.1 1.2 V Vt0 Duty cycle = 0%, SW = VIN 0.4 0.5 0.6 V DMAX 92 % Output block Output stage ON resistance RONH 5 Ω RONL 5 Ω (the upper side) Output stage ON resistance (the under side) Output stage ON current IONH 240 mA IONL 240 mA (the upper side) Output stage ON current (the under side) The whole device Standby current ICCS EN < 1V Mean consumption current ICCA EN > 4.3V 60 3.3 μA mA No.A1759-2/5 LV5747NTT Package Dimensions unit : mm (typ) 3375 Allowable power dissipation, Pd max -- W 3.0 0.5 3.0 4.9 12 1 2 (0.25) Pd max -- Ta 1.0 0.125 0.5 1.1 MAX 0.8 0.75 0.6 0.4 0.36 0.2 0 --40 --20 0 20 40 60 8085 100 Ambient temperature, Ta -- °C 0.08 (0.85) 0.2 Specified board : 35 × 32 × 1.6mm3 glass epoxy 2-layer board. SANYO : MSOP12(150mil) Pin Assignment 12 SS FB 1 11 ILIM COMP 2 EN 3 SW 4 LV5747NTT 10 VIN 9 GND 8 VDD CBOOT 5 7 LDRV HDRV 6 Top view No.A1759-3/5 LV5747NTT Block Diagram VIN 10 5V REGULATOR + OCP Comp ILIM 11 20μA REFERENCE VOLTAGE SS 12 FB 1 0.7V COMP 2 + + - + - SD VIN + Current Amp 5 CBOOT 6 HDRV S Q R DMAX = 90% SAW WAVE OSCILLATOR fosc forcec 1/8 Err Amp 0.5V + - UVLO S Q R 5μA 1.1V SD TSD 1.1V 0.5V + PWM Comp CONTROL Logic 4 SW 5V 7 LDRV shut down(SD) FFOLD Amp 8 VDD 9 GND 3 EN Pin Function Pin No. 1 Pin name FB Description Error amplifier reverse input pin. By operating the converter, the voltage of this pin becomes 0.708V. The voltage in which the output voltage is divided by an external resistance is applied to this pin. Moreover, when this pin voltage becomes 0.5V or less after a soft start ends, the frequency fold back function operations, and the oscillating frequency is falling with the FB voltage. 2 COMP Error amplifier output pin. Connect a phase compensation circuit between this pin and FB. 3 EN ON/OFF pin. 4 SW Pin to connect with switching node. The source of NchMOSFET connects to this pin. 5 CBOOT Bootstrap capacity connection pin. This pin becomes a GATE drive power supply of an external NchMOSFET. Connect a bypath capacitor between CBOOT and SW. 6 HDRV An external the upper MOSFET gate drive pin. 7 LDRV An external the lower MOSFET gate drive pin. 8 VDD Power supply pin for an external the lower MOS-FET gate drive. 9 GND Ground pin. Each reference voltage is based on the voltage of the ground pin. 10 VIN Power supply pin. This pin is monitored by UVLO function. When the voltage of this pin becomes 7.8V or more by UVLO 11 ILIM Reference current pin for current detection. The sink current of about 20μA flows to this pin. function, The IC starts and the soft start function operates. When a resistance is connected between this pin and VIN outside and the voltage applied to the SW pin is lower than the voltage of the terminal side of the resistance, the upper NchMOSFET is off by operating the current limiter comparator. This operation is reset with respect to each PWM pulse. 12 SS Pin to connect a capacitor for soft start. A capacitor for soft start is charged by using the voltage of about 5μA. This pin ends the soft start period by using the voltage of about 1.1V and the frequency fold back function becomes active. No.A1759-4/5 LV5747NTT Sample Application Circuit VIN = 8.0 to 42V C1 C7 R5 10 VIN C6 11 ILIM CBOOT 5 C2 Q1 HDRV 6 3 EN ON/OFF L OUT SW 4 Q2 12 SS 2 COMP C5 R1 C4 C9 FB 1 C10 D1 R2 C3 D2 R4 LDRV 7 C11 GND 9 VDD 8 C8 R3 GND 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 June, 2010. Specifications and information herein are subject to change without notice. PS No.A1759-5/5