NJU7600 PWM control Step-Up / Flyback switching regulator IC ■GENERAL DESCRIPTION ■PACKAGE OUTLINE NJU7600 is a high speed low voltage operation switching regulator control IC. It features a totem pole driver that can directly drive an external MOS-FET. Internal soft-start function, Dead time control and timer latch function are included, requiring no external components. All parameters can be optimized by additional external components for design flexibility. ■FEATURES ● PWM switching control ● Operating Voltage 2.2V to 8V ● Wide Oscillator Range 300kHz to 1MHz ● Maximum Duty Cycle 90% typ. ● Quiescent Current 800µA typ. ● Soft-Start Function Internal : 16ms typ. or adjustable ● Dead Time Control ● Timer Latch for Short Circuit Protection ● C-MOS Technology ● Package Outline NJU7600M : DMP8 NJU7600RB1 : TVSP8 NJU7600M NJU7600RB1 ■PRODUCT VARIATION NJU7601* NJU7602* PWM/PFM Light Load to Efficiency Standby Function Over Current Protection NJU7600 NJU7610* PWM Control * Under Development ■PIN CONFIGURATION 1 8 2 7 3 6 4 5 NJU7600M NJU7600RB1 Ver.2005-03-01 PIN FUNCTION 1. V+ 2. FB 3. IN4. SCP 5. DTC 6. RT 7. GND 8. OUT -1- NJU7600 ■BLOCK DIAGRAM + V FB 0.8V ER⋅AMP IN1V 0.2V Vref Soft Start UVLO Latch PWM Buffer 2uA SCP OUT SCP OSC 2kΩ 0.5V 1V 0.74V 0.5 A RT 1V DTC -2- RT GND Ver.2005-03-01 NJU7600 ■ABSOLUTE MAXIMUM RATINGS (Ta=25°C) 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 TVSP8 :320 -40 ~ +85 -40 ~ +125 ■RECOMMENDED OPERATING CONDITIONS (Ta=25°C) PARAMETER SYMBOL MIN. Operating Voltage V+ 2.2 Oscillator Timing Resistor RT 30 Oscillation Frequency fOSC 300 TYP. – 47 700 UNIT V mA mW °C °C MAX. 8 120 1,000 UNIT V kΩ kHz ■ELECTRICAL CHARACTERISTICS (V+=3.3V, RT=47kΩ, Ta=25°C) PARAMETER 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.2005-03-01 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 µA 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 ~ 8V – 1 – % fDT Ta=-40°C ~ +85°C – 3 – % -3- NJU7600 ■ELECTRICAL CHARACTERISTICS (V+=3.3V, RT=47kΩ, Ta=25°C) 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 -1.5% -0.1 – – 25 4 0.10 1.00 – 80 1 55 9 0.16 +1.5% 0.1 – – 95 16 0.22 V µA dB MHz mA mA mA 0.16 0.44 85 40 0.22 0.5 90 50 0.28 0.56 95 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=47kΩ ROH IO=-20mA – 10 20 Ω ROL IO=+20mA – 5 10 Ω RL=Non Load – 800 1200 µA IDD Ver.2005-03-01 NJU7600 ■ TYPICAL APPLICATIONS Step-Up Converter SBD L V + VOUT CIN R2 NJU7600 C + 1 V OUT 8 2 FB GND 7 3 IN- RT 6 4 SCP DTC 5 CNF COUT FET R1 RT RNF CSCP RDTC CS Flyback Converter T + V SBD VOUT CIN NJU7600 C CNF RNF 1 V 2 + FET OUT 8 FB GND 7 3 IN- RT 6 4 SCP DTC 5 COUT R1 RT CSCP Ver.2005-03-01 R2 RDTC CS -5- NJU7600 ■TYPICAL CHARACTERISTICS Oscillation Frequency vs. Timing Resistance + 90 AX UTY_1 95 100 10 85 80 100 100 Timing Resistance RT (kΩ) 1000 Oscillator Frequency fOSC (kHz) Duty Cycle vs. R DTC Oscillation Frequency fosc (kHz) Oscillation Frequency vs. Operating Voltage Duty Cycle MAXDUTY (%) 720 700 680 660 80 60 40 20 0 0 20 40 60 80 100 Dead Time Control Resistance RDTC (kΩ) Reference Voltage vs. Operating Voltage Quiescent Current vs. Operating Voltage 2 4 6 8 + Operating Voltage V (V) o o (V =3.3V, Ta=25 C) Quiescent Current IDD (uA) 1 0.998 0 2 4 6 8 + Operating Voltage V (V) (R =47kΩ, R =Non Load, Ta=25 C) T 1400 1.002 -6- T 10 0 1.004 0.996 (V =3.3V, R =47kΩ, Ta=25 C) 100 T 740 o + (R =47kΩ, Ta=25oC) + Reference Voltage VB (V) o (V =3.3V, Ta=25 C) 100 Maximum Duty Cycle M D (%) 1000 Oscillation Frequency fOSC (kHz) Maximum Duty Cycle vs. Oscillator Frequency (V+=3.3V, Ta=25oC) 10 L 1200 1000 800 600 400 200 0 0 2 4 6 8 + Operating Voltage V (V) 10 Ver.2005-03-01 NJU7600 ■TYPICAL CHARACTERISTICS Error Amplifier Block Voltage Gain, Phase vs. Frequency + o (V =3.3V, Gain=40dB, Ta=25 C) Gain 30 90 15 45 + V =1.95V 14 V+=3.3V 6 4 V+=8V 2 0 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) 100 V+=3.3V 10 V+=1.95V 1 -50 Ver.2005-03-01 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) Output Sink Current IOM- (mA) Error Amplifier Block Output Source Current vs. Temperature (VFB=1V, VIN-=0.9V) V+=8V 0 10000 Output Block Output Low Level ON Resistance vs. Temperature (Io=+20mA) 12 10 8 OH Output High Level ON Resistance R (Ω) 10 100 1000 Frequency f (kHz) 10 1000 Output Source Current IOM+ (mA) 1 Output Block Output High Level ON Resistance vs. Temperature (Io=-20mA) 12 135 Phase 0 0.1 14 180 Phase Φ (deg) 45 Output Low Level ON Resistance ROL (Ω) 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 o Ambient Temperature Ta ( C) 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 o Ambient Temperature Ta ( C) -7- NJU7600 ■TYPICAL CHARACTERISTICS Soft Start Time vs. Temperature Reference Voltage vs. Temperature + (V =3.3V) 24 Reference Voltage VB (V) Soft Start Time Tss (ms) 22 20 1.005 18 16 14 12 1 0.995 10 8 -50 (V+=3.3V) 1.01 0.99 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) Oscillator Frequency vs. Temperature -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) Muximum Duty Cycle vs. Temperature + Muximum Duty Cycle M D (%) 680 660 -8- MAX DUTY_1 70 VT_ON V T_OFF -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) 60 MAX DUTY_2 50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) Quiescent Current vs. Temperature Under Voltage Lockout Block vs. Temperature 1.94 1.86 -50 80 40 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) 2.02 1.9 90 AX 700 1.98 (V+=3.3V) UTY 720 640 -50 100 T 740 2.06 Threshold Voltage (V) (V =3.3V, R =47kΩ) 1000 Quiescent Current IDD (uA) Oscillator Frequency fOSC (kHz) 760 (V+=3.3V, R =47kΩ) T 800 600 400 200 0 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) Ver.2005-03-01 NJU7600 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.2005-03-01 -9-