NJU7610 Step-Up / Flyback switching regulator IC with Over Current Protection ■GENERAL DESCRIPTION ■PACKAGE OUTLINE The NJU7610 is a low voltage operation high-speed switching regulator control IC for step-up and flyback converter, with a pulse-by-pulse over-current protection. The pulse-by-pulse over-current protection circuit can limit the over current in switching operation. It incorporates a totem pole output, which can drive an external MOS-FET easily. It also has a soft-start function and dead time control and their times are all adjustable with external parts. The NJU7610 is available in 8-lead DMP and MSOP (TVSP) packages. ■FEATURES ● PWM switching control ● Pulse-by-pulse over current protection ● 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 ● C-MOS Technology ● Package Outline NJU7610M : DMP8 NJU7610RB1 : MSOP8 (TVSP8)* NJU7610M (DMP8) NJU7610RB1 (MSOP8 (TVSP8)) ■PRODUCT VARIATION NJU7620 Constant Current Control NJU7610 Over Current Protection NJU7600 PWM Control *MEET JEDEC MO-187-DA / THIN TYPE ■PIN CONFIGURATION 1 8 2 7 3 6 4 5 NJU7610M NJU7610RB1 Ver.2012-08-03 PIN FUNCTION 1. V+ 2. FB 3. IN4. SENSE 5. DTC 6. RT 7. GND 8. OUT -1- NJU7610 ■BLOCK DIAGRAM + V 0.8V FB ER⋅AMP 0.2V IN1V Vref Soft Start UVLO PWM Buffer SENSE OUT OCP Blanking OSC 0.5V OUT 0.2V 0.5 RT 0.74V A DTC RT GND RT -2- Ver.2012-08-03 NJU7610 ■ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL Supply Voltage V+ Output Pin Current IO Power Dissipation PD Operating Temperature Range Storage Temperature Range MAXIMUM RATINGS +9 ±50 DMP8 : 300 MSOP8 (TVSP8) : 320 -40 to +85 -40 to +125 TOPR TSTG ■RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL Operating Voltage V+ Oscillator Timing Resistor RT Oscillation Frequency fOSC MIN. 2.2 30 300 TYP. – 47 700 Under Voltage Lockout Block ON Threshold Voltage OFF Threshold Voltage Hysteresis Voltage Soft Start Block Soft Start Time mW °C °C MAX. 8 120 1,000 (Ta=25°C) UNIT V kΩ kHz (V+=3.3V, RT=47kΩ, Ta=25°C) ■ELECTRICAL CHARACTERISTICS PARAMETER (Ta=25°C) 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 0.17 0.2 0.23 V – 140 – ns Over Current Protection Block Current Limit Sense Voltage Delay Time VSENSE Sense Blanking Time TBLANK – 90 – ns VRT fOSC -5% 630 0.5 700 +5% 770 V kHz Oscillator Block RT Pin Voltage Oscillation Frequency Oscillate Supply Voltage Fluctuations Oscillate Temperature Fluctuations Ver.2012-08-03 TDELAY VSENSE+0.1V Delay time to OUT fDV V+=2.2V to 8V – 1 – % fDT Ta=-40°C to +85°C – 3 – % -3- NJU7610 (V+=3.3V, RT=47kΩ, Ta=25°C) ■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 -1.5% -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.2012-08-03 NJU7610 ■ TYPICAL APPLICATIONS Step-Up Converter SBD L V + VOUT CIN R2 NJU7610 C + 1 V OUT 8 2 FB GND 7 CNF COUT FET R1 RSC RT RNF 3 IN- 4 SENCE DTC RT 6 5 CS RDTC Flyback Converter V T + SBD VOUT CIN NJU7610 C CNF RNF 1 V 2 + COUT FET OUT 8 FB GND 7 3 IN- RT 6 4 SENCE DTC R1 RT RSC 5 RDTC Ver.2012-08-03 R2 CS -5- NJU7610 ■TYPICAL CHARACTERISTICS Oscillation Frequency vs. Timing Resistance + + (V =3.3V, Ta=25 C) 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 vs. Operating Voltage (R =47kΩ, Ta=25oC) 740 720 700 680 660 2 4 6 8 + Operating Voltage V (V) 10 T 80 60 40 20 0 0 (V =3.3V, R =47kΩ, Ta=25 C) 100 T o + Duty Cycle MAXDUTY (%) Oscillation Frequency fosc (kHz) o (V =3.3V, Ta=25 C) 100 Maximum Duty Cycle M D (%) 1000 Oscillation Frequency fOSC (kHz) Maximum Duty Cycle vs. Oscillator Frequency o 0 20 40 60 80 100 Dead Time Control Resistance RDTC (kΩ) Duty Cycle vs. Current Limit Sense Voltage (V+=3.3V, RT=47kΩ, Ta=25oC) 75 Duty Cycle D UTY (%) 100 50 25 0 -6- 0 0.2 0.4 0.6 0.8 1 Current Limit Sense Voltage VSENSE (V) Ver.2012-08-03 NJU7610 ■TYPICAL CHARACTERISTICS (V =3.3V, Ta=25 C) Reference Voltage VB (V) 1.004 1.002 1 0.998 0.996 0 2 4 6 8 Operating Voltage V+ (V) 10 Current Limit Sense Voltage vs. Operating Voltage (V+=3.3V, Ta=25oC) 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0 T 60 L Voltage Gain Av (dB) Quiescent Current IDD (µA) 1400 1200 1000 800 600 400 10 Error Amplifier Block Voltage Gain, Phase vs. Frequency (V+=3.3V, Gain=40dB, Ta=25 oC) Quiescent Current vs. Operating Voltage (R =47kΩ, R =Non Load, Ta=25oC) 2 4 6 8 Operating Voltage V+ (V) Phase 45 180 135 Gain 30 90 15 45 Phase Φ (deg) o + Current Limit Sense Voltage VSENSE (V) Reference Voltage vs. Operating Voltage 200 0 Ver.2012-08-03 0 2 4 6 8 Operating Voltage V+ (V) 10 0 0.1 1 10 100 1000 Frequency f (kHz) 0 10000 -7- NJU7610 ■TYPICAL CHARACTERISTICS + V =1.95V 12 10 (ns) DELAY Delay Time T 12 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 -50 200 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) V+=1.95V V+=1.95V 100 V =3.3V V+=8V 50 0 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) 8 V+=3.3V 6 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) Soft Start Time vs. Temperature Delay Time vs. Temperature (VSENSE +0.1V Delay time to OUT) + 150 Output Sink Current IOM- (mA) Output Source Current IOM+ (mA) V+=3.3V 250 -8- Output Block Output Low Level ON Resistance vs. Temperature (Io=+20mA) 10 8 1000 14 24 Soft Start Time Tss (ms) Output High Level ON Resistance ROH (Ω) 14 Output Low Level ON Resistance ROL (Ω) Output Block Output High Level ON Resistance vs. Temperature (Io=-20mA) (V+=3.3V) 22 20 18 16 14 12 10 8 -50 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) Ver.2012-08-03 NJU7610 ■TYPICAL CHARACTERISTICS Reference Voltage vs. Temperature SENSE 1.005 1 0.995 0.99 -50 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) Current Limit Sense Voltage V Reference Voltage VB (V) 1.01 Current Limit Sense Voltage vs. Temperature (V) (V+=3.3V) (V+=3.3V) 0.21 0.205 0.2 0.195 0.19 -50 Oscillator Frequency vs. Temperature -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) Muximum Duty Cycle vs. Temperature 760 80 700 60 660 Ver.2012-08-03 40 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) Under Voltage Lockout Block vs. Temperature VT_ON VT_OFF -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) Quiescent Current vs. Temperature 1000 1.94 1.86 -50 MAX DUTY_2 50 2.02 1.9 MAX DUTY_1 70 680 1.98 (V+=3.3V) 90 720 640 -50 100 Muximum Duty Cycle MAX DUTY (%) 740 2.06 Threshold Voltage (V) (V =3.3V, RT=47kΩ) Quiescent Current IDD (µA) Oscillator Frequency fOSC (kHz) + (V+=3.3V, RT=47kΩ) 800 600 400 200 0 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) -9- NJU7610 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. - 10 - Ver.2012-08-03