전자부품 데이터시트 검색엔진 |
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BD3951F 데이터시트(PDF) 4 Page - Rohm |
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BD3951F 데이터시트(HTML) 4 Page - Rohm |
4 / 10 page BD3951F Technical Note 4/9 www.rohm.com 2009.07 - Rev.A © 2009 ROHM Co., Ltd. All rights reserved. ● Block Diagram, Application Circuit, Pin Description PIN External Component Value Vcc Capacitor :Cin 0.33μF~ 10mF OUT Capacitor :Co 3.3μF~ 2200μF CT Capacitor :Cct 0.01μF~10μF SIN Resistor :R1,R2 0Ω~100kΩ RADJ Resistor :R3,R4 0Ω~100kΩ ・ ESR range of the output capacitor Co is 0 (ceramic capacitor) to 100Ω. ・ VCC must be more than 5V under the condition SIN is used for VCC voltage drop detection. Ex. Vcc=5.8V detection, Since 1.26V*(R1+R2)/R1=5.8V, R1=10kΩ,R2=36kΩ ・ Reset detection voltage must be more than 4V under the condition RADJ is used for OUT voltage drop detection. Ex. OUT=4.5V detection, Since 1.26V*(R3+R4)/R3=4.5V, R3=10kΩ,R4=26kΩ RESET function can be discarded while RADJ terminal pulls up to OUT terminal, which in case RES terminal output “H”. Battery detection function can be discarded while SIN terminal pulls up to OUT terminal, which in case SOUT terminal output “H”. 0~47KΩ pull up resistors are recommended in both condition. Set application board test is necessary to select the right pull up resistor value. ● Terminal Description Pin. No Pin Name Function 1 Vcc Battery power supply 2 SIN Battery voltage detection input terminal. Must be connected to OUT terminal while this function is not employed. 3 RADJ RESET voltage adjustment terminal. Connect to GND in case internal detect voltage is employed 4 CT RESET delay time control terminal 5 GND IC GND terminal 6 RES RESET output terminal. Built in 20KΩ pull up. 7 SOUT Battery voltage detection output terminal. Built in 20KΩ pull up. 8 OUT 5.0V output terminal OUT SOUT RES GND Vcc SIN RADJ CT Fig.13 Fig.14 Vref OUT GND CT RES PreReg SOUT SIN 20kΩ 20kΩ VCC RADJ VCC 1 2 3 4 5 6 7 8 0.33μF 3.3μF 0.1μF R2:36kΩ R1:10kΩ Vcc OUT (8PIN) 3.3μF R4=26kΩ R3=10kΩ RADJ (3PIN) |
유사한 부품 번호 - BD3951F |
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유사한 설명 - BD3951F |
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