NJU7680 2ch switching regulator IC ■GENERAL DESCRIPTION The NJU7680 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. Each channel has an on/off switch. Therefore, the power sequence can be activated externally. Internal soft-start function, dead time control and timer latch function are included, and those functions can be easily controlled by external component. ■PACKAGE OUTLINE NJU7680V NJU7680SED ■FEATURES ● Step-Down, Step-Up/SEPIC circuit ● PWM switching control ● Operating Voltage 2.3V to 7V ● Wide Oscillator Range 300kHz to 1MHz ● Soft-Start Function Internal: 4ms typ. or adjustable ● Channel ON/OFF Function ● Standby Quiescent Current 1 A max. ● Dead Time Control ● Timer Latch for Short Circuit Protection ● C-MOS Technology ● Package Outline NJU7680V : SSOP16 NJU7680SED : PCSP24-ED Ver.2013-10-16 -1- NJU7680 ■PIN CONFIGURATION <SSOP16 package> 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 PIN FUNCTION 1. SCP 2. CE1 3. CE2 4. FB2 5. IN-2 6. V+ 7. DTC2 8. OUT2 9. OUT1 10. DTC1 11. GND 12. GND 13. RT 14. VREG 15. IN-1 16. FB1 (Top View) NJU7680V <PCSP24-ED package> 18 17 16 15 14 13 13 19 12 12 20 11 11 14 15 10 10 22 9 9 17 18 19 20 PAD (*1) 21 16 PAD (*1) 21 22 PAD (*1) PAD (*1) 23 8 8 23 24 7 7 24 1 2 3 4 5 6 6 (Top View) 5 4 3 2 1 PIN FUNCTION 1. N.C. 2. FB2 3. IN-2 4. N.C. 5. V+ 6. N.C. 7. DTC2 8. N.C. 9. OUT2 10. N.C. 11. OUT1 12. N.C. 13. DTC1 14. GND 15. GND 16. RT 17. VREG 18. N.C. 19. IN-1 20. FB1 21. N.C. 22. SCP 23. CE1 24. CE2 (Bottom View) NJU7680SED (*1) The PAD is not connected to an IC chip electrically. -2- Ver.2013-10-16 NJU7680 ■BLOCK DIAGRAM V Vref 1V + VREG V Regulator 2V UVLO + 2 A SCP RT_ON 2k CE1 1V ON/OFF 1V SCP CE2 FB1 IN-1 ER AMP1 DTC1 PWM1 SST1 Buffer1 OUT1 DTC_COMP1 CH1 FB2 IN-2 ER AMP2 DTC2 PWM2 SST2 Buffer2 OUT2 DTC_COMP2 CH2 0.8V 0.2V GND OSC RT_ON 0.5V + RT V RT RP SW On/Off Function The On/Off switch for each channel is controlled by CE pin. Setting the CE low will turn off all applicable channels’ circuit. Turning off both channels will turn off all circuit. Opening the RT pin will turn off all circuit regardless of input signals from CE pin. RT H H H H L L L L Ver.2013-10-16 Input Signal CE1 H H L L H H L L CE2 H L H L H L H L Operating State CH1 CH2 ON ON ON OFF OFF ON OFF Standby Mode -3- NJU7680 Soft Start Feature (Soft Start) The soft-start is internally set for 4ms typ. To adjust the time, insert resistance or connect capacitor to the DTC pin. Max Duty Max Duty is set 90% for CH1 (Step-up) and 100% for CH2 (Step-down). Max Duty can be adjusted by connecting the VERG pin to the DTC pin. When not limiting Max Duty, connect DTC pin to VREG pin by resistor more than 2k . Short Circuit Protection The short circuit protection block employs time latch, and protection delay time can be adjusted by a capacitor connected to SCP pin. The program of timer latch circuit can be reset by restarting the power (supply voltage must be lower than UVLO sensing voltage), setting IC to standby status, or lowering SCP pin to GND level. ■ABSOLUTE MAXIMUM RATINGS (Ta=25°C) PARAMETER SYMBOL Supply Voltage V+ Output Pin Current IO CE1 Pin Voltage VCE1 CE2 Pin Voltage VCE2 Power Dissipation Operating Temperature Range Storage Temperature Range PD TOPR TSTG MAXIMUM RATINGS +8 50 +8 (*2) +8 (*2) SSOP16 : 300 PCSP24-ED : 475 (*3) -40 ~ +85 -40 ~ +125 UNIT V mA V V mW C C (*2): When input voltage is less than 8V, the absolute maximum control voltage is equal to the input voltage. (*3): Mounted on glass epoxy board based on EIA/JEDEC. (114.3 × 76.2 × 1.6mm: 2Layers) ■RECOMMENDED OPERATING CONDITIONS (Ta=25°C) PARAMETER SYMBOL MIN. + Operating Voltage V 2.3 Oscillator Timing Resistor RT 30 Oscillation Frequency fOSC 300 -4- TYP. – 47 700 MAX. 7 120 1,000 UNIT V k kHz Ver.2013-10-16 NJU7680 ■ELECTRICAL CHARACTERISTICS (V+=VCE1=VCE2=3.3V, RT=47k , Ta=25°C) PARAMETER Voltage Regulator Block Regulator Output Voltage Line Regulation Load Regulation Maximum Output Current Temp Fluctuations Under Voltage Lockout Block ON Threshold Voltage OFF Threshold Voltage Hysteresis Voltage Regulator Output Detection ON Threshold Voltage Regulator Output Detection OFF Threshold Voltage Regulator Output Detection Hysteresis Voltage Short Circuit Protection Block Input Threshold Voltage 1 Input Threshold Voltage 2 Charge Current Latch Mode ON Threshold Voltage Latch Mode OFF Threshold Voltage Soft Start Block Soft Start Time 1 Soft Start Time 2 Oscillator Block RT Pin Voltage Oscillation Frequency Oscillate Supply Voltage Fluctuations Oscillate Temperature Fluctuations Standby RT Terminal Resistance Ver.2013-10-16 SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT 1.97 – -10 4 – 2.0 5 -1 – 0.5 2.03 15 – – – V mV mV mA % V+= L → H V+= H → L 2.1 2.0 60 2.2 2.1 100 2.3 2.2 – V V mV VREG = L → H 1.6 1.7 1.8 V VT_OFF_REG VREG = H → L 1.5 1.6 1.7 V VHYS_REG 60 100 – mV VREG VREG_LINE VREG_LOAD IREG_MAX VREG_TC1 VT_ON VT_OFF VHYS VT_ON_REG + V =2.2 7V IREG=0 2mA VREG=1.9V Ta=-40 +85 C VT_PC1 VT_PC2 ICHG FB1 Pin FB2 Pin VSCP=0V 0.95 0.95 1.5 1.00 1.00 2 1.05 1.05 2.5 V V A VT_LA SCP Pin 0.90 1.00 1.10 V VT_LAOFF SCP Pin 0.35 0.6 0.85 V 3 3 4 4 6 6 ms ms -5% 630 0.5 700 +5% 770 V kHz TSS1 TSS2 VT_ON → Duty1=80% VT_ON → Duty2=80% VRT fOSC fDV V+=2.2 ~ 7V – 1 – % fDT Ta=-40 C ~ +85 C – 3 – % – 2 – RT_STB M -5- NJU7680 ■ELECTRICAL CHARACTERISTICS (V+=VCE1=VCE2=3.3V, RT=47k , Ta=25°C) PARAMETER Error Amplifier Block Reference Voltage 1 Reference Voltage 2 Input Bias Current 1 Input Bias Current 2 Open Loop Gain Gain Bandwidth Product Output Source Current 1 Output Source Current 2 Output Sink Current 1 Output Sink Current 2 SYMBOL VB1 VB2 IB1 IB2 AV GB IOM+1 IOM+2 IOM-1 IOM-2 TEST CONDITION VFB1=1V, VIN-1=0.9V VFB2=1V, VIN-2=0.9V VFB1=1V, VIN-1=1.1V VFB2=1V, VIN-2=1.1V MIN. TYP. MAX. UNIT -1.5% -1.5% -0.1 -0.1 – – 17 17 0.5 0.5 1.00 1.00 – – 80 1 32 32 2.5 2.5 +1.5% +1.5% 0.1 0.1 – – 47 47 5.0 5.0 V V A A dB MHz A A mA mA 0.15 0.46 0.15 0.46 85 40 100 40 0.22 0.53 0.22 0.53 90 50 – 50 0.29 0.60 0.29 0.60 95 60 – 60 V V V V % % % % PWM Comparate Block Input Threshold Voltage 1 Input Threshold Voltage 2 Maximum Duty Cycle 1 (*4) Maximum Duty Cycle 2 (*4) Output Block Output High Level ON Resistance 1 Output High Level ON Resistance 2 Output Low Level ON Resistance 1 Output Low Level ON Resistance 2 ON/OFF Block ON Control Voltage 1 OFF Control Voltage 1 ON Control Voltage 2 OFF Control Voltage 2 General Characteristics Quiescent Current 1 Quiescent Current 2 Standby Current 1 Standby Current 2 -6- VT_0_1 VT_50_1 VT_0_2 VT_50_2 MAXDUTY11 MAXDUTY12 MAXDUTY21 MAXDUTY22 Duty1=0% Duty1=50% Duty2=0% Duty2=50% VFB1=0.9V VFB1=0.9V, VDTC1=0.53V VFB2=0.9V VFB2=0.9V, VDTC2=0.53V ROH1 IOUT1=-20mA – 5 10 ROH2 IOUT2=-20mA – 5 10 ROL1 IOUT1=+20mA – 5 10 ROL2 IOUT2=+20mA – 5 10 VON1 VOFF1 VON2 VOFF2 CE1= L → H CE1= H → L CE2= L → H CE2= H → L 1.2 – 1.2 – – – – – V+ 0.6 V+ 0.6 V V V V – – – – 1 0.7 – – 1.6 1.2 3.0 1.0 mA mA A A IDD1 IDD2 IDD STB1 IDD STB2 RL=Non Load Per channel ON VCE1=VCE2=0V RT=OPEN Ver.2013-10-16 NJU7680 (*4) : CH1 is a step-up converter that is intended to drive Nch MOSFET. OUT1 terminal output as High levels is defined as the maximum duty cycle. CH2 is a step-down converter that is intended to drive Pch MOSFET. OUT2 terminal output as Low level is defined as the maximum duty cycle. ■TYPICAL APPLICATIONS VOUT1 + V GND SCP FB1 CE1 IN-1 CE2 VREG FB2 RT CREG=0.1 F RT=47k NJU7680 IN-2 GND + GND V VOUT2 RDTC1=10k 0.1 F DTC2 DTC1 OUT2 OUT1 RDTC2=10k CSCP= 0.1 F Ver.2013-10-16 -7- NJU7680 ■TYPICAL CHARACTERISTICS Oscillation Frequency vs. Operating Voltage 1000 Oscillation Frequency fosc (kHz) (V+=3.3V, Ta=25oC) Oscillation Frequency f OSC (kHz) Oscillation Frequency vs. Timing Resistance 100 10 100 Timing Resistance RT (k ) (R =47k , Ta=25oC) T 740 720 700 680 660 0 (Ta=25oC) (Ta=25oC) REG (V) 10 1.01 1.005 VB2 1 0.995 V =7.0V -10 V =3.3V 2 4 6 + Operating Voltage V (V) 8 + V+=2.3V -20 -30 0 + 0 V VB1 Output Voltage (V) Reference Voltage V B 1.015 0.99 0 Quiescent Current vs. Operating Voltage 2 4 6 Output Current I REG (mA) (R =47k , R =Non Load, Ta=25 C) L -8- DD_STB IDD1 1500 1000 Standby Current I Quiescent Current I DD ( A) ( A) T 2000 IDD2 500 0 2 4 6 + Operating Voltage V (V) 8 8 Standby Current vs. Operating Voltage o 0 8 Voltage Regulator Block Load Regulation Reference Voltage vs. Operating Voltage 1.02 2 4 6 + Operating Voltage V (V) (Ta=25oC) 3 2.5 2 1.5 IDD_STB1 1 0.5 0 IDD_STB2 0 2 4 6 + Operating Voltage V (V) 8 Ver.2013-10-16 NJU7680 ■TYPICAL CHARACTERISTICS Duty Cycle1 vs. Oscillator Frequency Duty Cycle1 vs. DTC1 pin Voltage 40 for f 20 300kHz, 500kHz, 700kHz, 1MHz OSC = 0 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 DTC1 pin Voltage VDTC1 (V) UTY_1 60 (%) UTY_2 AX 40 for f 20 300kHz, 500kHz, 700kHz, 1MHz = 0 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 DTC2 pin Voltage VDTC2 (V) V DTC1 100 (CH2, V+=3.3V, Ta=25oC) V DTC2 80 60 0.05V step 40 20 V DTC2 0 200 =0.3V 400 600 800 1000 Oscillator Frequency f OSC (kHz) Phase 180 135 Gain 30 90 15 45 1 =0.85V (deg) Voltage Gain Av (dB) Ver.2013-10-16 1 45 0 0.1 =0.3V 400 600 800 1000 Oscillator Frequency f OSC (kHz) Error Amplifier Block Voltage Gain, Phase vs. Frequency + o (V =3.3V, Gain=40dB, Ta=25 C) 60 =0.8V Duty Cycle2 vs. Oscillator Frequency (CH2, V =3.3V, Ta=25 C) OSC DTC1 20 o Duty Cycle2 M D UTY_2 60 Duty Cycle2 M D 80 AX (%) 100 =1.0V 40 Duty Cycle2 vs. DTC2 pin Voltage + DTC1 0.05V step 0 200 1 V V AX 60 100 80 Duty Cycle1 M D AX (%) (%) UTY_1 80 Duty Cycle1 M D (CH1, V =3.3V, Ta=25 C) 100 (CH1, V+=3.3V, Ta=25oC) o 10 100 1000 Frequency f (kHz) Phase + 0 10000 -9- NJU7680 15 Output Low Level ON Resistance R ( ) Output Block Output High Level ON Resistance vs. Temperature (Io=-20mA) 20 V+=2.3V + V =3.3V + V =7V 5 0 -50 Output Block Output Low Level ON Resistance vs. Temperature (Io=+20mA) 20 15 V+=2.3V + V =3.3V 10 OL 10 OH Output High Level ON Resistance R ( ) ■TYPICAL CHARACTERISTICS -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) + V =7V 5 0 -50 Soft Start Time vs. Temperature Oscillator Frequency vs. Temperature + (V =3.3V) (kHz) 760 5.5 4.5 4 3.5 3 2.5 2 -50 700 680 660 640 -50 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) Reference Voltage V 1.005 1 0.995 0.99 0.985 -50 - 10 - (V) REG B 1.01 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) Voltage Regulator Block Output Voltage vs. Temperature Regulator Output Voltage V (V) (V+=3.3V) T 720 Reference Voltage vs. Temperature 1.015 (V+=3.3V, R =47k ) 740 OSC 5 Oscillator Frequency f Soft Start Time Tss (ms) 6 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) 2.04 (V+=3.3V, IREG =0mA) 2.03 2.02 2.01 2 1.99 1.98 1.97 1.96 -50 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) Ver.2013-10-16 NJU7680 ■TYPICAL CHARACTERISTICS ( A) T DD_STB 2 Standby Current vs. Temperature (V+=3.3V, R =47k ) 1.5 1 0.5 0 -50 IDD1 Standby Current I Quiescent Current I DD (mA) Quiescent Current vs. Temperature IDD2 Threshold Voltage (V) 2.2 :V CE1 =V CE2 =0V IDD_STB2: RT=OPEN 1.5 IDD_STB1 1 0.5 I DD_STB2 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) Under Voltage Lockout Block vs. Temperature VT_ON V 1.8 V 1.4 -50 DD_STB1 2 0 -50 2 1.6 T I 2.5 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) 2.4 (V+=3.3V, R =47k ) 3 T_OFF T_ON_REG VT_OFF_REG -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) [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.2013-10-16 - 11 -