NJU7601 Step-Up/Flyback Switching Regulator IC with Power Saving PWM/PFM control GENERAL DESCRIPTION The NJU7601 is a low voltage operation high-speed switching regulator control IC for step-up and fly-back converter, with PWM/PFM switching control. It can improve a switching efficiency on light load with automatically changing between PWM and PFM controls, and incorporates a totem pole output, which can drive an external MOS-FET easily. The NJU7601 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 and MSOP (TVSP) packages. It is suitable for battery powered applications. PACKAGE OUTLINE FEATURES Automatic PWM/PFM Control Operating Voltage 2.2V to 8V Wide Oscillator Range 300kHz to 1MHz Maximum Duty Cycle 90% typ. Quiescent Current 800A 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)* NJU7601M (DMP8) NJU7601RB1 (MSOP8(TVSP8)) PRODUCT VARIATION NJU760x** Standby Function PWM/PFM NJU7601 PWM/PFM Light Load to Efficiency NJU7600 PWM Control ** Planning *MEET JEDEC MO-187-DA / THIN TYPE PIN CONFIGURATION 1 8 2 7 3 6 4 5 NJU7601M NJU7601RB1 Ver.2012-08-03 PIN FUNCTION 1. V+ 2. FB 3. IN4. SCP 5. DTC 6. RT 7. GND 8. OUT -1- NJU7601 BLOCK DIAGRAM + V FB 0.8V ERAMP IN- 0.2V 1V Vref PWM/PFM Control Soft Start UVLO Latch PWM 2A SCP Buffer OUT SCP OSC 2k 0.5V 1V 0.74V 0.5 A RT 1V DTC RT GND RT -2- Ver.2012-08-03 NJU7601 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 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=25C) UNIT V k kHz (V+=3.3V, RT=47k, Ta=25C) ELECTRICAL CHARACTERISTICS PARAMETER (Ta=25C) 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 A 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=-40C to +85C - 3 - % -3- NJU7601 (V+=3.3V, RT=47k, Ta=25C) 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 A dB MHz mA mA mA 0.29 0.44 85 40 17 0.35 0.5 90 50 25 0.41 0.56 95 60 33 V V % % % PWM Complete Block Input Threshold Voltage Maximum Duty Cycle PWM/PFM Change 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 PFMDUTY Duty=PFMDUTY Duty=50% VFB=0.9V VFB=0.9V, RDTC=47k ROH IO=-20mA - 10 20 ROL IO=+20mA - 5 10 RL=Non Load - 800 1200 A IDD Ver.2012-08-03 NJU7601 TYPICAL APPLICATIONS Step-Up Converter SBD L V + VOUT CIN R2 NJU7601 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 NJU7601 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- NJU7601 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 (k) 1000 Oscillator Frequency fOSC (kHz) Duty Cycle vs. R DTC Oscillation Frequency fosc (kHz) Oscillation Frequency vs. Operating Voltage (RT=47k, Ta=25oC) 60 AX Duty Cycle M D T 80 UTY 720 700 680 660 (V =3.3V, R =47k, Ta=25 C) 100 (%) 740 40 20 0 10 0 20 40 60 80 100 Dead Time Control Resistance RDTC (k) 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 (A) 1.002 1 0.998 -6- 0 2 4 6 8 Operating Voltage V+ (V) (R =47k, 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 NJU7601 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 () 1 Output Block Output High Level ON Resistance vs. Temperature (Io=-20mA) 12 135 Phase 0 0.1 14 180 Phase (deg) 45 Output Low Level ON Resistance ROL () 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- NJU7601 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 + 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=47k) 1000 Quiescent Current IDD (A) Oscillator Frequency fOSC (kHz) 760 (V+=3.3V, RT=47k) 800 600 400 200 0 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) Ver.2012-08-03 NJU7601 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- Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: NJR: NJU7601RB1-TE1 NJU7601M