NJU7630 PWM control Step-Down switching regulator IC GENERAL DESCRIPTION PACKAGE OUTLINE The NJU7630 is a low voltage operation high-speed switching regulator control IC for step-down converter, with PWM control. It incorporates a totem pole output, which can drive an external MOS-FET easily. The NJU7630 also has a soft-start function, dead time control and timer latch for short circuit protection and their times are all adjustable with external parts. It is available in 8-lead DMP and MSOP (TVSP) packages. It is suitable for battery powered applications. FEATURES PWM switching control Operating Voltage 2.2V to 8V Wide Oscillator Range 300kHz to 1MHz Maximum Duty Cycle 100% Quiescent Current 800A typ. Soft-Start Function Internal : 16ms typ. or adjustable Dead Time Control Timer Latch for Short Circuit Protection C-MOS Technology Package Outline NJU7630M : DMP8 NJU7630RB1 : MSOP8 (TVSP8)* NJU7630RB1 (MSOP8 (TVSP8)) NJU7630M (DMP8) PRODUCT VARIATION NJU7631 NJU7632 PWM/PFM Light Load to Efficiency Standby Function Over Current Protection NJU7630 NJU7640 PWM Control Constant Current Control NJU7650 *MEET JEDEC MO-187-DA / THIN TYPE PIN CONFIGURATION 1 8 2 7 3 6 4 5 NJU7630M NJU7630RB1 Ver.2012-08-03 PIN FUNCTION 1. OUT 2. V+ 3. FB 4. IN5. SCP 6. DTC 7. RT 8. GND -1- NJU7630 BLOCK DIAGRAM + V FB 0.8V ERAMP IN1V 0.2V Vref Soft Start UVLO Latch PWM Buffer 2A SCP OUT SCP OSC 2k 0.5V 0.5 1V RT A 1V DTC RT GND RT -2- Ver.2012-08-03 NJU7630 ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL Supply Voltage V+ Output Pin Current IO Power Dissipation PD Operating Temperature Range Storage Temperature Range TOPR TSTG MAXIMUM RATINGS +9 50 DMP8 :300 MSOP8 (TVSP8) :320 -40 to +85 -40 to +125 RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL MIN. Operating Voltage V+ 2.2 Oscillator Timing Resistor RT 30 Oscillation Frequency fOSC 300 TYP. - 47 700 Under Voltage Lockout Block ON Threshold Voltage OFF Threshold Voltage Hysteresis Voltage Soft Start Block Soft Start Time Short Circuit Protection Block Input Threshold Voltage Charge Current Latch Mode ON Threshold Voltage Latch Mode OFF Threshold Voltage Oscillator Block RT Pin Voltage Oscillation Frequency Oscillate Supply Voltage Fluctuations Oscillate Temperature Fluctuations Ver.2012-08-03 mW C C MAX. 8 120 1,000 (Ta=25C) UNIT V k kHz (V+=3.3V, RT=47k, Ta=25C) ELECTRICAL CHARACTERISTICS PARAMETER (Ta=25C) UNIT V mA SYMBOL VT_ON VT_OFF VHYS TSS TEST CONDITION V+= L H V+= H L VT_ON Duty=80% MIN. TYP. MAX. UNIT 1.9 1.8 60 2.0 1.9 100 2.1 2.0 - V V mV 8 16 24 ms VT_PC ICHG FB Pin VSCP=0V 0.95 1.5 1.00 2 1.05 2.5 V A VT_LA SCP Pin 0.95 1.00 1.05 V VT_LAOFF SCP Pin 0.2 0.45 0.7 V -5% 630 0.5 700 +5% 770 V kHz VRT fOSC fDV V+=2.2V to 8V - 1 - % fDT Ta=-40C to +85C - 3 - % -3- NJU7630 (V+=3.3V, RT=47k, Ta=25C) ELECTRICAL CHARACTERISTICS PARAMETER Error Amplifier Block Reference Voltage Input Bias Current Open Loop Gain Gain Bandwidth Product Output Source Current Output Sink Current SYMBOL TEST CONDITION VB IB AV GB IOM+_1 IOM+_2 IOM- VFB=1V, VIN-=0.9V VFB=1V, VIN-=0.9V, V+=2.2V VFB=1V, VIN-=1.1V MIN. TYP. MAX. UNIT -1.0% -0.1 - - 25 4 0.10 1.00 - 80 1 55 9 0.16 +1.0% 0.1 - - 95 16 0.22 V A dB MHz mA mA mA 0.16 0.44 100 40 0.22 0.5 - 50 0.28 0.56 - 60 V V % % PWM Comparate Block Input Threshold Voltage Maximum Duty Cycle Output Block Output High Level ON Resistance Output Low Level ON Resistance General Characteristics Quiescent Current -4- VT_0 VT_50 MAXDUTY_1 MAXDUTY_2 Duty=0% Duty=50% VFB=0.9V VFB=0.9V, RDTC=47k ROH IO=-20mA - 10 20 ROL IO=+20mA - 5 10 RL=Non Load - 800 1200 A IDD Ver.2012-08-03 NJU7630 TYPICAL APPLICATIONS Step-Down Converter FET L VIN VOUT SBD CIN COUT NJU7630 1 OUT 2 V 3 C R1 GND 8 RT 7 FB DTC 6 IN- SCP 5 + Ver.2012-08-03 4 RT RDTC CS CNF RNF R2 CSCP -5- NJU7630 TYPICAL CHARACTERISTICS Oscillation Frequency vs. Timing Resistance Oscillation Frequency fosc (kHz) Oscillation Frequency fOSC (kHz) 1000 100 10 Oscillation Frequency vs. Operating Voltage (V+=3.3V, Ta=25oC) 720 700 680 660 100 Timing Resistance RT (k) Duty Cycle vs. R DTC T 10 (Ta=25oC) Reference Voltage V (V) 1.004 B 80 60 40 20 0 2 4 6 8 + Operating Voltage V (V) (V =3.3V, R =47k, Ta=25 C) AX Duty Cycle M D UTY (%) 100 0 Reference Voltage vs. Operating Voltage o + (RT=47k, Ta=25oC) 740 1.002 1 0.998 0.996 0 20 40 60 80 100 Dead Time Control Resistance RDTC (k) 0 2 4 6 8 Operating Voltage V+ (V) 10 Quiescent Current vs. Operating Voltage (R =47k, R =Non Load, Ta=25oC) T Quiescent Current IDD (A) 1400 1200 1000 800 600 400 200 0 -6- L 0 2 4 6 8 Operating Voltage V+ (V) 10 Ver.2012-08-03 NJU7630 TYPICAL CHARACTERISTICS Error Amplifier Block Voltage Gain, Phase vs. Frequency + o (V =3.3V, Gain=40dB, Ta=25 C) Gain 30 90 15 45 10 100 1000 Frequency f (kHz) + V =1.95V 8 Output Source Current IOM+ (mA) V+=3.3V 6 4 V+=8V 2 0 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) Error Amplifier Block Output Source Current vs. Temperature (VFB=1V, VIN-=0.9V) V+=8V 100 V+=3.3V 10 V+=1.95V 1 -50 Ver.2012-08-03 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) 0 10000 Output Block Output Low Level ON Resistance vs. Temperature (Io=+20mA) 12 10 10 1000 14 Output Sink Current IOM- (mA) Output High Level ON Resistance ROH () 1 Output Block Output High Level ON Resistance vs. Temperature (Io=-20mA) 12 135 Phase 0 0.1 14 180 Phase (deg) 45 Output Low Level ON Resistance ROL () Voltage Gain Av (dB) 60 V+=1.95V 8 6 V+=3.3V 4 2 0 -50 0.2 0.15 V+=8V -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) Error Amplifier Block Output Sink Current vs. Temperature (VFB=1V, VIN- =1.1V) V+=1.95V, 3.3V, 8V 0.1 0.05 0 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) -7- NJU7630 TYPICAL CHARACTERISTICS Soft Start Time vs. Temperature Reference Voltage vs. Temperature + (V =3.3V) 22 20 1.005 18 16 14 12 1 0.995 10 8 -50 0.99 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) (V+=3.3V, RT=47k) 2.06 740 Threshold Voltage (V) Oscillator Frequency fOSC (kHz) Oscillator Frequency vs. Temperature 760 720 700 680 660 640 -50 (V+=3.3V) 1.01 Reference Voltage VB (V) Soft Start Time Tss (ms) 24 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) Under Voltage Lockout Block vs. Temperature 2.02 VT_ON 1.98 1.94 VT_OFF 1.9 1.86 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) Quiescent Current vs. Temperature Quiescent Current IDD (A) 1000 800 600 400 200 0 -50 -8- (V+=3.3V, RT=47k) -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) Ver.2012-08-03 NJU7630 MEMO [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. Ver.2012-08-03 -9-