NJU7602

NJU7600 PWM control Step-Up / Flyback switching regulator IC ■GENERAL DESCRIPTION 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. ■PACKAGE OUTLINE NJU7600M NJU7600RB1 ■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 ■PRODUCT VARIATION NJU7601* PWM/PFM Light Load to Efficiency NJU7602* Standby Function Over Current Protection NJU7600 PWM Control NJU7610* * Under Development ■PIN CONFIGURATION 1 2 3 4 8 7 6 5 NJU7600M NJU7600RB1 PIN FUNCTION 1. V+ 2. FB 3. IN4. SCP 5. DTC 6. RT 7. GND 8. OUT Ver.2005-03-01 -1- NJU7600 ■BLOCK DIAGRAM V FB + ER⋅AMP 0.8V IN1V Vref 0.2V Soft Start UVLO Latch PWM SCP 2uA SCP OSC 2kΩ 0.5 A RT 0.5V 0.74V Buffer OUT 1V 1V DTC RT GND -2- 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 UNIT V mA mW °C °C ■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 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 SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT VT_ON VT_OFF VHYS V+= L → H V+= H → L 1.9 1.8 60 2.0 1.9 100 2.1 2.0 – V V mV TSS VT_ON → Duty=80% 8 16 24 ms VT_PC ICHG VT_LA VT_LAOFF FB Pin VSCP=0V SCP Pin SCP Pin 0.95 1.5 0.95 0.2 1.00 2 1.00 0.45 1.05 2.5 1.05 0.7 V µA V V VRT fOSC fDV fDT V+=2.2V ~ 8V Ta=-40°C ~ +85°C -5% 630 – – 0.5 700 1 3 +5% 770 – – V kHz % % Ver.2005-03-01 -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 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 VT_0 VT_50 MAXDUTY_1 MAXDUTY_2 Duty=0% Duty=50% VFB=0.9V VFB=0.9V, RDTC=47kΩ 0.16 0.44 85 40 0.22 0.5 90 50 0.28 0.56 95 60 V V % % SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT VB IB AV GB IOM+_1 IOM+_2 IOMVFB=1V, VIN-=0.9V VFB=1V, VIN-=0.9V, V+=2.2V VFB=1V, VIN-=1.1V -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 ROH ROL IO=-20mA IO=+20mA – – 10 5 20 10 Ω Ω IDD RL=Non Load – 800 1200 µA -4- Ver.2005-03-01 NJU7600 ■ TYPICAL APPLICATIONS Step-Up Converter L V + SBD VOUT CIN R2 FET COUT R1 C 1 NJU7600 V + OUT GND RT DTC 8 2 CNF RNF 3 FB INSCP 7 RT 6 4 5 CSCP RDTC CS Flyback Converter V + T CIN SBD VOUT R2 C 1 NJU7600 V + FET OUT GND RT DTC 8 COUT R1 CNF RNF 2 FB INSCP 7 RT 3 6 4 5 CSCP RDTC CS Ver.2005-03-01 -5- NJU7600 ■TYPICAL CHARACTERISTICS Oscillation Frequency vs. Timing Resistance Oscillation Frequency fOSC (kHz) 1000 (V+=3.3V, Ta=25oC) Maximum Duty Cycle MD (%) Maximum Duty Cycle vs. Oscillator Frequency 100 95 90 85 80 100 Oscillator Frequency f (kHz) OSC Duty Cycle vs. R + (V =3.3V, Ta=25 C) + o 100 10 AX UTY_1 100 Timing Resistance R (kΩ) T 1000 Oscillation Frequency vs. Operating Voltage Oscillation Frequency fosc (kHz) 740 720 700 680 660 (R =47kΩ, Ta=25oC) T DTC o 100 Duty Cycle MAXDUTY (%) 80 60 40 20 0 (V =3.3V, R =47kΩ, Ta=25 C) T 0 2 4 6 8 + Operating Voltage V (V) 10 0 20 40 60 80 100 Dead Time Control Resistance R (kΩ) DTC Quiescent Current vs. Operating Voltage Reference Voltage vs. Operating Voltage 1.004 Reference Voltage VB (V) 1.002 1 0.998 0.996 (V =3.3V, Ta=25 C) Quiescent Current IDD (uA) + o 1400 1200 1000 800 600 400 200 0 0 (R =47kΩ, R =Non Load, Ta=25 C) T L o 0 2 4 6 8 + Operating Voltage V (V) 10 2 4 6 8 + Operating Voltage V (V) 10 -6- Ver.2005-03-01 NJU7600 ■TYPICAL CHARACTERISTICS Error Amplifier Block Voltage Gain, Phase vs. Frequency + o (V =3.3V, Gain=40dB, Ta=25 C) 60 Voltage Gain Av (dB) 45 180 135 90 45 Gain 30 15 0 0.1 1 10 100 1000 Frequency f (kHz) 0 10000 Output High Level ON Resistance R (Ω) 12 10 8 6 4 2 0 -50 V =1.95V + Output Low Level ON Resistance ROL (Ω) 14 Output Block Output High Level ON Resistance vs. Temperature (Io=-20mA) 14 12 10 8 6 4 2 0 -50 Output Block Output Low Level ON Resistance vs. Temperature (Io=+20mA) Phase Φ (deg) Phase V+=1.95V V+=3.3V V+=3.3V OH V+=8V -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) V+=8V -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) Output Source Current IOM+ (mA) V+=8V 100 V+=3.3V 10 V+=1.95V 1 -50 Output Sink Current IOM- (mA) 1000 Error Amplifier Block Output Source Current vs. Temperature (VFB=1V, VIN-=0.9V) 0.2 0.15 0.1 0.05 0 -50 Error Amplifier Block Output Sink Current vs. Temperature (VFB=1V, VIN-=1.1V) V+=1.95V, 3.3V, 8V -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) Ver.2005-03-01 -7- NJU7600 ■TYPICAL CHARACTERISTICS Soft Start Time vs. Temperature 24 Soft Start Time Tss (ms) 22 20 18 16 14 12 10 8 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) (V =3.3V) Reference Voltage VB (V) + Reference Voltage vs. Temperature 1.01 1.005 1 (V+=3.3V) 0.995 0.99 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) Oscillator Frequency vs. Temperature Oscillator Frequency fOSC (kHz) 760 740 720 700 680 660 640 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) (V =3.3V, R =47kΩ) T + Muximum Duty Cycle vs. Temperature 100 Muximum Duty Cycle MD (%) 90 80 70 60 50 40 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) MAX DUTY_2 MAX DUTY_1 (V+=3.3V) AX UTY 2.06 Threshold Voltage (V) 2.02 1.98 1.94 1.9 1.86 -50 Under Voltage Lockout Block vs. Temperature Quiescent Current IDD (uA) Quiescent Current vs. Temperature 1000 800 600 400 200 0 -50 (V+=3.3V, R =47kΩ) T VT_ON V T_OFF -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) -8- 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-