NJU7600 PWM control Step-Up / Flyback switching regulator IC ■GENERAL DESCRIPTION ■PACKAGE OUTLINE The NJU7600 is a low voltage operation high-speed switching regulator control IC for PWM control step-up and fly-back converter. It incorporates a totem pole driver output, which can directly drive an external MOS-FET easily. The NJU7600 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, MSOP (TVSP) packages and 10-lead MSOP (TVSP) package. 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 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 : MSOP8 (TVSP8)* NJU7600RB2 : MSOP10 (TVSP10)* NJU7600M (DMP8) NJU7600RB1 (MSOP8 (TVSP8)) NJU7600RB2 (MSOP10(TVSP10)) ■PRODUCT VARIATION NJU7601 NJU7602 PWM/PFM Light Load to Efficiency Standby Function Over Current Protection NJU7600 NJU7610 PWM Control Constant Current Control NJU7620 *MEET JEDEC MO-187-DA / THIN TYPE ■PIN CONFIGURATION 1 8 2 7 3 6 4 5 NJU7600M NJU7600RB1 Ver.2012-08-03 PIN FUNCTION 1. V+ 2. FB 3. IN4. SCP 5. DTC 6. RT 7. GND 8. OUT 1 10 2 9 3 8 4 7 5 6 NJU7600RB2 PIN FUNCTION 1. V+ 2. N.C. 3. FB 4. IN5. SCP 6. DTC 7. RT 8. GND 9. GND 10. OUT -1- NJU7600 ■BLOCK DIAGRAM + V NJU7600M NJU7600RB1 FB 0.8V ER⋅AMP IN1V 0.2V Vref Soft Start UVLO Latch PWM 2µA SCP Buffer OUT SCP OSC 2kΩ 0.5V 0.5 A RT 1V 0.74V 1V DTC RT GND RT V NJU7600RB2 + 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 N.C. 1V DTC RT GND GND RT -2- Ver.2012-08-03 NJU7600 ■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 MSOP10 (TVSP10) : 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 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=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 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 to 8V – 1 – % fDT Ta=-40°C to +85°C – 3 – % -3- NJU7600 (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 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 CS RDTC Flyback Converter V T + 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.2012-08-03 R2 RDTC CS -5- NJU7600 ■TYPICAL CHARACTERISTICS Oscillation Frequency vs. Timing Resistance 1000 (V+=3.3V, Ta=25oC) 100 Maximum Duty Cycle (%) M D Oscillation Frequency fOSC (kHz) Maximum Duty Cycle vs. Oscillator Frequency (V+=3.3V, Ta=25oC) 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 (RT=47kΩ, Ta=25oC) 720 700 680 660 (V =3.3V, R =47kΩ, Ta=25 C) 100 Duty Cycle MAXDUTY (%) 740 T 80 60 40 20 0 10 0 20 40 60 80 100 Dead Time Control Resistance RDTC (kΩ) Reference Voltage vs. Operating Voltage Quiescent Current vs. Operating Voltage 0 2 4 6 8 + Operating Voltage V (V) o (Ta=25 C) Quiescent Current IDD (µA) 1.002 1 0.998 -6- 0 2 4 6 8 Operating Voltage V+ (V) (R =47kΩ, R =Non Load, Ta=25oC) T 1400 B Reference Voltage V (V) 1.004 0.996 o + 10 L 1200 1000 800 600 400 200 0 0 2 4 6 8 Operating Voltage V+ (V) 10 Ver.2012-08-03 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 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 (Ω) 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 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- NJU7600 ■TYPICAL CHARACTERISTICS Reference Voltage vs. Temperature Soft Start Time vs. Temperature (V+=3.3V) + (V =3.3V) 24 Reference Voltage VB (V) Soft Start Time Tss (ms) 22 1.005 20 18 16 14 1 0.995 12 10 8 -50 1.01 0.99 -50 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) Oscillator Frequency vs. Temperature -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) Muximum Duty Cycle vs. Temperature + 80 700 60 660 -8- 40 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) 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 Under Voltage Lockout Block vs. Temperature 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) 1000 Quiescent Current IDD (µA) Oscillator Frequency fOSC (kHz) 760 (V+=3.3V, RT=47kΩ) 800 600 400 200 0 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) Ver.2012-08-03 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.2012-08-03 -9-