Ordering number : ENA1768 Bi-CMOS IC LV5762LF Step-down Switching Regulator Overview LV5762LF is a 1ch step-down voltage switching regulator. Functions • Load-independent soft start circuit • 1ch step-down switching regulator controller • Frequency fold back function • ON/OFF function • Built-in pulse-by-pulse OCP circuit. It is detected by using ON resistance of an external MOS. Specifications Maximum Ratings at Ta = 25°C Parameter Supply voltage Symbol Conditions Ratings VIN max Unit 45 *) V Allowable power dissipation Pd max 0.65 W Operating temperature Topr -40 to 85 °C Storage temperature Tstg -55 to 150 °C * Specified board: 24.0mm × 15.0mm ×1.6mm, glass epoxy board (2-layer). Recommended Operating Conditions at Ta = 25°C Parameter Symbol Conditions Ratings Unit Supply voltage range 1 VIN 8 to 42 V Error amplifier input coltage VFB 0 to 1.6 V Electrical Characteristics at Ta = 25°C, VIN = 12V Parameter Symbol Conditions Ratings max Unit min typ 0.695 0.705 0.715 V 4.7 5.2 5.7 V Reference voltage block Internal reference voltage Vref Including offset of E/A 5V power supply VDD IOUT=0 to 5mA Continued on next page. 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 20100524-S00001 No.A1768-1/5 LV5762LF Continued from preceding page. Parameter Symbol Conditions Ratings min typ max Unit Triangular waveform oscillator block 870 Oscillation frequency fOSC Frequency variation fOSC_DV VIN=8 to 42V Oscillatory frequency fold back detection voltage VOSC_FB Detect IN voltage after the end of SS Oscillatory frequency after fold back fOSC_FB 1000 1130 1 kHz % 0.5 V 100 150 200 kHz 3.4 4.3 V ON/OFF circuit block IC start-up voltage VEN_on VIN=8 to 42V IC off voltage VEN_off VIN=8 to 42V 1.1 1.3 Soft start source current ISS_SC EN › 5V, SS=0V 3.4 4.3 Soft start sink current ISS_SK EN › 1V, VDD=5V, SS=1V Voltage to end the soft start function VSS_END 0.7 0.9 1.1 V UVLO lock release voltage VUVLO 7.0 7.4 7.8 V UVLO hysteresis VUVLO_H V Soft start circuit block 5.2 2 μA mA UVLO circuit block 0.6 V Error amplifier Input bias current IEA_IN Error amplifier transconductance GEA 1000 Common mode input voltage range VEA_R VIN=8 to 42V Sink output current IEA_OSK FB=1.0V Source output current IEA_OSC FB=0V Current detection amplifier gain 1400 0.0 100 μA 1800 μA/V 1.6 V -100 μA 100 μA 1.3 GISNS Over current limiter circuit block Reference current Over current detection comparator offset voltage +10% μA -5 +5 mV VIN-0.45 VIN V -10% ILIM VLIM_OFS Over current detection comparator common 20 mode input range PWM comparator Input threshold voltage Maximum ON duty Vtmax Duty cycle=DMAX 0.95 1.1 1.25 V Vt0 Duty cycle=0% 0.35 0.45 0.55 V 75 80 % 5 Ω DMAX Output block Output stage ON resistance(the upper side) RONH Output stage ON resistance(the under side) RONL Output stage ON current(the upper side) IONH 240 mA Output stage ON current(the under side) IONL 240 mA Ω 5 The whole device Standby current ICCS EN ‹ 1V Mean consumption current ICCA EN › 5V 60 3.6 μA mA No.A1768-2/5 LV5762LF FB NC NC SS/ HICCUP Pin Assignment 16 15 14 13 COMP 1 12 11 VIN EN 2 LV5762LF SW 3 10 GND CBOOT 4 6 7 NC NC 8 LDRV 5 HDRV 9 VDD Top view Pin Function Pin No. Pin name Function 1 COMP Error amplifier output pin. 2 EN ON/OFF pin. 3 SW Pin to connect with switching node. The source of Nch MOSFET connects to this pin. 4 CBOOT Bootstrap capacity connection pin. This pin becomes a GATE drive power supply of an external Nch MOSFET. 5 HDRV An external the upper MOSFET gate drive pin. NC No connection 8 LDRV An external the lower MOSFET gate drive pin. 9 VDD Power supply pin for an external the MOS-FET gate drive. 10 GND Ground pin. Each reference voltage is based on the voltage of the ground pin. 11 VIN Power supply pin. Connect a phase compensation circuit between this pin and GND. Connect a bypath capacitor between CBOOT and SW. 6, 7 14, 15 This pin is monitored by UVLO function. When the voltage of this pin becomes 7.8V or more by UVLO function, The IC starts and the soft start function operates. 12 ILIM Reference current pin for current detection. The sink current of about 20μA flows to this pin. 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 Nch MOSFET is off by operating the current limiter comparator. This operation is reset with respect to each PWN pulse. 13 SS/HICCUP Pin to connect a capacitor for soft start. A capacitor for soft start is charged by using the voltage of about 4.3μA. This pin ends the soft start period by using the voltage of about 0.9V and the frequency fold back function becomes active. 16 FB Error amplifier reverse input pin. By operating the converter, the voltage of this pin becomes 0.7V. The voltage in which the output voltage is divided by an external resistance is applied to this pin. Also, the oscillation frequency become one-eighth when the voltage of this pin becomes 0.4V or less after soft start function. No.A1768-3/5 LV5762LF Package Dimensions unit : mm (typ) 3394 SIDE VIEW 1.0 BOTTOM VIEW Allowable power dissipation, Pd max -- W TOP VIEW Exposed Die-Pad Do Not Connect 3.0 0.4 (1.5) 3.0 (1.5) 16 2 1 1 2 0.5 0.85 MAX 0.25 (0.8) SIDE VIEW (0.75) Pd max -- Ta Mounted on a specified board: 24.0×15.0×1.6mm3 2 laery glass epoxy board (2-layer) 0.8 0.65 0.6 0.4 0.34 0.2 0 -40 0 -20 20 40 60 80 100 0.0 NOM Ambient temperature, Ta -- C SANYO : VQFN16(3.0X3.0) Block Diagram VIN 5V REGULATOR REFERENCE VOLTAGE TSD UVLO S ILIM + OCP Comp VIN + + 1.3V - Q R Current Amp HICCUP Comp CBOOT + OCP 0.9V SD SS/ HICCUP FB 0.7V + + - - SS Comp SD HDRV S Q SW R SAW WAVE OSCILLATOR HICCUP Comp COMP fOSC forced 1/8 CONTROL Logic D-max=90% 1.1V 0.45V + - VDD + LDRV - GND + Shutdown(SD) 0.5V EN No.A1768-4/5 LV5762LF Sample Application Circuit VIN=8V to 42V C7 R5 VIN C6 ILIM CBOOT ON/OFF C1 C2 Q1 HDRV EN LV5762LF L OUT SW Q2 SS/HICCUP R4 LDRV C4 D1 FB C5 R1 COMP GND R2 C3 C31 C9 VDD D2 C10 R3 C8 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.A1768-5/5