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NJU7602 Dataheets PDF



Part Number NJU7602
Manufacturers JRC
Logo JRC
Description Step-Up / Flyback switching regulator IC
Datasheet NJU7602 DatasheetNJU7602 Datasheet (PDF)

NJU7602 Step-Up / Flyback switching regulator IC with standby function ■GENERAL DESCRIPTION The NJU7602 is a low voltage operation high-speed switching regulator control IC for step-up and flyback converter, with a standby function. It incorporates a totem pole output, which can drive an external MOS-FET easily. The NJU7602 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. Further the internal .

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NJU7602 Step-Up / Flyback switching regulator IC with standby function ■GENERAL DESCRIPTION The NJU7602 is a low voltage operation high-speed switching regulator control IC for step-up and flyback converter, with a standby function. It incorporates a totem pole output, which can drive an external MOS-FET easily. The NJU7602 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. Further the internal standby function minimize the current during non-active condition. It is available in 8-lead DMP and MSOP (TVSP) packages, and it is suitable for battery powered applications. ■PACKAGE OUTLINE NJU7602M (DMP8) NJU7602RB1 (MSOP8(TVSP8)) ■FEATURES ■PRODUCT VARIATION ● PWM switching control ● Standby Function NJU760x** ● Operating Voltage ● Wide Oscillator Range 2.2V to 8V 300kHz to 1MHz Standby Terminal ● Maximum Duty Cycle 90% typ. NJU7602 ● Quiescent Current ● Soft-Start Function Operating :800µA typ. Standby :1µA max. Internal :16ms typ. or adjustable Standby Function NJU7600 ● Dead Time Control ● Timer Latch for Short Circuit Protection PWM Control ● C-MOS Technology ** Planning ● Package Outline NJU7602M : DMP8 NJU7602RB1 : MSOP8 (TVSP8)* *MEET JEDEC MO-187-DA / THIN TYPE ■PIN CONFIGURATION 1 2 3 4 NJU7602M NJU7602RB1 8 7 6 5 PIN FUNCTION 1. V+ 2. FB 3. IN 4. SCP 5. DTC 6. RT 7. GND 8. OUT Ver.2012-08-03 -1- NJU7602 ■BLOCK DIAGRAM FB IN- 1V Vref V+ ER⋅AMP Soft Start Latch UVLO SCP 1V 2µA SCP 2kΩ 1V 0.5 RT A DTC 0.8V 0.2V OSC 0.5V PW M Buffer OUT 0.74V Standby ON/OFF RT RT V+ GND RP ON/OFF High: ON Low : OFF (Standby) -2- Ver.2012-08-03 NJU7602 ■ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Output Pin Current Power Dissipation SYMBOL V+ IO PD Operating Temperature Range Storage Temperature Range TOPR TSTG MAXIMUM RATINGS +9 ±50 DMP8 :300 MSOP8 (TVSP8) :320 -40 to +85 -40 to +125 (Ta=25°C) UNIT V mA mW °C °C ■RECOMMENDED OPERATING CONDITIONS PARAMETER Operating Voltage Oscillator Timing Resistor Oscillation Frequency SYMBOL V+ RT fOSC MIN. 2.2 30 300 (Ta=25°C) TYP. MAX. UNIT –8V 47 120 kΩ 700 1,000 kHz ■ELECTRICAL CHARACTERISTICS PARAMETER SYMBOL TEST CONDITION 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 Standby RT Terminal Resistance VT_ON VT_OFF VHYS V+= L → H V+= H → L TSS VT_ON → Duty=80% VT_PC ICHG VT_LA FB Pin VSCP=0V SCP Pin VT_LAOFF SCP Pin VRT fOSC fDV fDT RT_STB V+=2.2V to 8V Ta=-40°C to +85°C (V+=3.3V, RT=47kΩ, Ta=25°C) MIN. TYP. MAX. UNIT 1.9 2.0 2.1 V 1.8 1.9 2.0 V 60 100 – mV 8 16 24 ms 0.95 1.00 1.05 V 1.5 2 2.5 µA 0.95 1.00 1.05 V 0.2 0.45 0.7 V -5% 0.5 +5% V 630 700 770 kHz – 1 –% – 3 –% – 2 – MΩ Ver.2012-08-03 -3- NJU7602 ■ELECTRICAL CHARACTERISTICS PARAMETER SYMBOL TEST CONDITION Error Amplifier Block Reference Voltage Input Bias Current Open Loop Gain Gain Bandwidth Product Output Source Current Output Sink Current PWM Complete Block Input Threshold Voltage Maximum Duty Cycle Output Block Output High Level ON Resistance Output Low Level ON Resistance 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 VT_0 VT_50 MAXDUTY_1 MAXDUTY_2 Duty=0% Duty=50% VFB=0.9V VFB=0.9V, RDTC=47kΩ ROH IO=-20mA ROL IO=+20mA General Characteristics Quiescent Current Standby Quiescent Current IDD IDD_STB RL=Non Load RT=Open (V+=3.3V, RT=47kΩ, Ta=25°C) MIN. TYP. MAX. UNIT -1.5% 1.00 +1.5% V -0.1 – 0.1 µA – 80 – dB – 1 – MHz 20 45 70 mA 4 9 16 mA 0.10 0.16 0.22 mA 0.16 0.22 0.28 V 0.44 0.5 0.56 V 85 90 95 % 40 50 60 % – 10 20 Ω – 5 10 Ω – 800 1200 µA – – 1.0 µA -4- Ver.2012-08-03 ■ TYPICAL APPLICATIONS Step-Up Converter V+ L CIN SBD C CNF RNF NJU7602 1 V+ OUT 8 2 FB GND 7 3 IN- RT 6 4 SCP DTC 5 CSCP RDTC FET COUT RP RT ON/OFF High : ON CS Low : OFF (Standby) NJU7602 VOUT R2 R1 Flyback Converter V+ C CNF RNF NJU7602 1 V+ OUT 8 2 FB GND 7 3 IN- RT 6 4 SCP DTC 5 CSCP RDTC T CIN FET RP RT SBD COUT ON/OFF High : ON CS Low : OFF (Standby) VOUT R2 R1 Ver.2012-08-03 -5- NJU7602 ■TYPICAL CHARACTERISTICS Oscillation Frequency vs. Timing Resistance 1000 (V+=3.3V, Ta=25oC) Oscillation Frequency f (kHz) OSC Oscillation Frequency fosc (kHz) 100 10 100 Timing Resistance RT (kΩ) Oscillation Frequency vs. Operating Voltage 740 (RT=47kΩ, Ta=25oC) 720 700 680 660 0 2468 Operating Voltage V+ (V) 10 Reference Voltage vs. Operating Voltage 1.004 (Ta=25oC) 1.002 1 0.998 0.996.


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