Ordering number : ENA0852A Monolithic Linear IC LA5797M For Variable Capacitance Diodes Charge Pump Step-up Power Supply Overview The LA5797M is a charge pump step-up power supply for Variable capacitance diodes. Features • By using charge pump, no coils are necessary. • Time-base generator (140kHz) incorporated. • Thermal shutdown circuit incorporated. Specifications Maximum Ratings at Ta = 25°C Parameter Input voltage Symbol Conditions Ratings VIN Allowable power dissipation Pd max Mounted on the specified board. * Unit 30 V 0.91 W Operating temperature Topr -25 to +90 °C Storage temperature Tstg -40 to +150 °C * Specified board: 114.3mm × 76.1mm × 1.6mm, glass epoxy board. Recommended Operating Conditions at Ta = 25°C Parameter Input voltage range Symbol VIN Conditions Ratings Unit 7.5 to 28 V 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. 82207 MS 20070727-S00003 / 62707 MS PC No.A0852-1/4 LA5797M Electrical Characteristics at Ta = 25°C Parameter Symbol Ratings Conditions min Reference voltage VFB Switching frequency f Thermal shutdown operating VIN = 15V, IO = 5mA VIN = 7.5V to 28V Unit typ max 1.189 1.225 1.261 112 140 168 V kHz TSD Designed target value. * 165 °C ∆TSD Designed target value. * 15 °C temperature Thermal shutdown Hysteresis width * Design target value : No measurement made. Package Dimensions unit : mm (typ) 3032D Pd max -- Ta Allowable power dissipation, Pd max -- W 1.0 5.0 5 0.63 4.4 6.4 8 4 1.27 0.15 (1.5) 0.35 1.7max 1 (0.65) Specified board: 114.3×76.1×1.6mm3 glass epoxy board. 0.8 0.6 0.44 0.4 0.2 0 -25 0 25 50 75 90 100 125 0.1 Ambient temperature, Ta -- °C SANYO : MFP8(225mil) Pin Assignment VIN 1 8 VRET EN 2 7 CPOUT NC 3 6 GND NC 4 5 FB Top view No.A0852-2/4 LA5797M Block Diagram VRET VIN Reg. DRIVE ON/OFF OSC EN CPOUT VREF Amp. DRIVE ON/OFF FB TSD GND Application Circuit Example External circuit diagram (VCC = 24V) VRET VCC 24V CPOUT LA5797M 31-32V EN FB GND External circuit diagram (VCC = 15V) VRET VCC 15V CPOUT LA5797M 31-32V EN FB GND Note : The IC is made active when the EN pin is pulled down to GND. The charge pump operation is stopped when the EN pin is pulled up to VIN. No.A0852-3/4 LA5797M 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 August, 2007. Specifications and information herein are subject to change without notice. PS No.A0852-4/4