NJU7631 JRC, NJU7631 Datasheet
NJU7631
Available stocks
Related parts for NJU7631
NJU7631 Summary of contents
Page 1
... Step-Down Switching Regulator IC with Power Saving PWM/PFM control ■GENERAL DESCRIPTION NJU7631 is a high speed low voltage operation switching regulator control IC with power saving PWM/PFM control. Automatic PWM/PFM control improves power efficiency at light load. It features a totem pole driver that can directly drive an external MOS-FET ...
Page 2
... NJU7631 www.DataSheet4U.com ■BLOCK DIAGRAM FB ER⋅AMP IN- 1V Vref Soft Start Latch SCP UVLO 2µA SCP OSC 2kΩ 0 DTC RT 0.8V 0.2V PWM/PFM Control PWM Buffer 0.5V GND R T OUT Ver.2006-07-12 ...
Page 3
... T V → Duty=80% SS T_ON V FB Pin T_PC I V =0V CHG SCP V SCP Pin T_LA V SCP Pin T_LAOFF OSC + f V =2. Ta=-40°C ~ +85°C DT NJU7631 UNIT °C °C MAX. UNIT 8 V 120 kΩ 1,000 kHz MIN. TYP. MAX. UNIT 1.9 2.0 2.1 1.8 1.9 2.0 60 100 – ...
Page 4
... NJU7631 www.DataSheet4U.com ■ELECTRICAL CHARACTERISTICS (V PARAMETER Error Amplifier Block Reference Voltage Input Bias Current Open Loop Gain Gain Bandwidth Product Output Source Current Output Sink Current PWM Comparate Block Input Threshold Voltage Maximum Duty Cycle PWM/PFM Change Duty Cycle Output Block Output High Level ...
Page 5
... TYPICAL APPLICATIONS Step-Down Converter Ver.2006-07-12 FET L C SBD IN NJU7631 OUT GND DTC IN- SCP 5 NF NJU7631 OUT DTC SCP OUT - 5 - ...
Page 6
... NJU7631 www.DataSheet4U.com ■TYPICAL CHARACTERISTICS Oscillation Frequency vs. Timing Resistance + (V =3.3V, Ta=25 1000 100 10 Timing Resistance R Duty Cycle vs =3.3V, R =47kΩ, Ta=25 100 Dead Time Control Resistance 100 (kΩ) T DTC o C) 1.004 1.002 0.998 0.996 60 80 100 (kΩ) DTC Quiescent Current vs ...
Page 7
... V =1.95V + V =3. = 100 125 o C) =0.9V =3. =1.95V 50 75 100 125 o C) NJU7631 o C) 180 135 1000 10000 Output Block Output Low Level ON Resistance vs. Temperature (Io=+20mA -50 - Ambient Temperature Ta ( Error Amplifier Block Output Sink Current vs. Temperature ...
Page 8
... NJU7631 www.DataSheet4U.com ■TYPICAL CHARACTERISTICS Soft Start Time vs. Temperature + (V =3.3V -50 - Ambient Temperature Ta ( Oscillator Frequency vs. Temperature + (V =3.3V, R 760 740 720 700 680 660 640 -50 - Ambient Temperature 1.005 0.995 50 75 100 125 o C) =47kΩ) ...
Page 9
... MEMO Ver.2006-07-12 NJU7631 [CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights ...