NJU7680V

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 (U.D.) ■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 1µA max. ● Dead Time Control ● Timer Latch for Short Circuit Protection ● C-MOS Technology ● Package Outline NJU7680V : SSOP16 NJU7680SED : PCSP24-ED (U.D.) Ver.2010-03-31 -1- NJU7680 ■PIN CONFIGURATION 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 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 18 17 16 15 14 13 13 14 15 16 17 18 19 20 21 22 23 24 12 11 10 9 8 7 12 11 PAD (*1) 10 9 PAD (*1) 8 7 PAD (*1) PAD (*1) 19 20 21 22 23 24 1 2 3 4 5 6 6 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 (Top View) NJU7680SED (U.D.) (Bottom View) (*1) The PAD is not connected to an IC chip electrically. -2- Ver.2010-03-31 NJU7680 ■BLOCK DIAGRAM VREG V + Vref 1V V+ 2µA Regulator 2V UVLO SCP 2kΩ 1V RT_ON CE1 ON/OFF 1V SCP CE2 FB1 IN-1 ER⋅AMP1 SST1 DTC_COMP1 PWM1 Buffer1 OUT1 DTC1 CH1 FB2 IN-2 ER⋅AMP2 SST2 DTC_COMP2 PWM2 Buffer2 OUT2 DTC2 CH2 0.8V 0.2V OSC 0.5V RT_ON GND RT RT V + 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. Input Signal CE1 H H L L H H L L Operating State CH1 CH2 ON ON ON OFF OFF ON OFF Standby Mode RT H H H H L L L L CE2 H L H L H L H L Ver.2010-03-31 -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, short the DTC pin to the VREG terminal. •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 °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) MAXIMUM RATINGS +8 ±50 +8 (*2) +8 (*2) SSOP16 : 300 PCSP24-ED : 475 (*3) -40 ~ +85 -40 ~ +125 UNIT V mA V V mW ■RECOMMENDED OPERATING CONDITIONS (Ta=25°C) PARAMETER SYMBOL MIN. + Operating Voltage V 2.3 Oscillator Timing Resistor 30 RT Oscillation Frequency fOSC 300 TYP. – 47 700 MAX. 7 120 1,000 UNIT V kΩ kHz -4- Ver.2010-03-31 NJU7680 ■ELECTRICAL CHARACTERISTICS (V+=VCE1=VCE2=3.3V, RT=47kΩ, 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 SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT VREG VREG_LINE VREG_LOAD IREG_MAX VREG_TC1 V =2.2 ∼ 7V IREG=0 ∼ 2mA VREG=1.9V Ta=-40 ∼ +85°C + 1.97 – -10 4 – 2.0 ±5 -1 – ±0.5 2.03 ±15 – – – V mV mV mA % VT_ON VT_OFF VHYS VT_ON_REG V+= L → H V+= H → L VREG = L → H 2.1 2.0 60 1.6 1.5 60 2.2 2.1 100 1.7 1.6 100 2.3 2.2 – 1.8 1.7 – V V mV V V mV VT_OFF_REG VREG = H → L VHYS_REG VT_PC1 VT_PC2 ICHG VT_LA VT_LAOFF FB1 Pin FB2 Pin VSCP=0V SCP Pin SCP Pin 0.95 0.95 1.5 0.90 0.35 1.00 1.00 2 1.00 0.6 1.05 1.05 2.5 1.10 0.85 V V µA V V TSS1 TSS2 VT_ON → Duty1=80% VT_ON → Duty2=80% 3 3 4 4 6 6 ms ms VRT fOSC fDV fDT RT_STB V+=2.2 ~ 7V Ta=-40°C ~ +85°C -5% 630 – – – 0.5 700 1 3 2 +5% 770 – – – V kHz % % MΩ Ver.2010-03-31 -5- NJU7680 ■ELECTRICAL CHARACTERISTICS (V+=VCE1=VCE2=3.3V, RT=47kΩ, 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 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 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 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 % % % % SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT VB1 VB2 IB1 IB2 AV GB IOM+1 IOM+2 IOM-1 IOM-2 VFB1=1V, VIN-1=0.9V VFB2=1V, VIN-2=0.9V VFB1=1V, VIN-1=1.1V VFB2=1V, VIN-2=1.1V -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 µA µA dB MHz µA µA mA mA ROH1 ROH2 ROL1 ROL2 IOUT1=-20mA IOUT2=-20mA IOUT1=+20mA IOUT2=+20mA – – – – 5 5 5 5 10 10 10 10 Ω Ω Ω Ω 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 IDD1 IDD2 IDD STB1 IDD STB2 RL=Non Load Per channel ON VCE1=VCE2=0V RT=OPEN – – – – 1 0.7 – – 1.6 1.2 3.0 1.0 mA mA µA µA -6- Ver.2010-03-31 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 IN-1 CREG=0.1µF VREG RT RT=47kΩ CE1 CE2 FB2 NJU7680 IN-2 V+ DTC2 OUT2 0.1µF GND GND DTC1 OUT1 VOUT2 CSCP= 0.1µF Ver.2010-03-31 -7- NJU7680 ■TYPICAL CHARACTERISTICS Oscillation Frequency vs. Timing Resistance (V+=3.3V, Ta=25oC) Oscillation Frequency vs. Operating Voltage Oscillation Frequency fosc (kHz) 740 720 700 680 660 (R =47kΩ, Ta=25oC) T Oscillation Frequency f OSC (kHz) 1000 100 10 100 Timing Resistance RT (kΩ) 0 2 4 6 + Operating Voltage V (V) 8 Reference Voltage vs. Operating Voltage Voltage Regulator Block Load Regulation 10 (V) 0 -10 V+=2.3V -20 -30 (Ta=25oC) 1.02 (V) B (Ta=25oC) Reference Voltage V 1.01 1.005 1 0.995 0.99 0 Output Voltage ∆V VB1 REG 1.015 V =7.0V + V =3.3V + VB2 2 4 6 + Operating Voltage V (V) 8 0 2 4 6 Output Current I REG (mA) 8 Quiescent Current vs. Operating Voltage ( µA) 2000 ( µA) 1500 1000 500 0 (R =47kΩ, R =Non Load, Ta=25 C) T L o Standby Current vs. Operating Voltage 3 2.5 2 1.5 1 0.5 0 0 IDD_STB2 2 4 6 + Operating Voltage V (V) 8 IDD_STB1 (Ta=25oC) Quiescent Current I IDD1 IDD2 0 2 4 6 + Operating Voltage V (V) 8 Standby Current I DD_STB DD -8- Ver.2010-03-31 NJU7680 ■TYPICAL CHARACTERISTICS Duty Cycle1 vs. DTC1 pin Voltage (%) 100 80 60 40 20 for f OSC Duty Cycle1 vs. Oscillator Frequency (%) 100 80 60 0.05V step (CH1, V =3.3V, Ta=25 C) + o (CH1, V+=3.3V, Ta=25oC) V DTC1 =1.0V DTC1 V =0.8V UTY_1 Duty Cycle1 M D = Duty Cycle1 M D AX AX UTY_1 40 20 V DTC1 300kHz, 500kHz, 700kHz, 1MHz =0.3V 0 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 DTC1 pin Voltage VDTC1 (V) 1 0 200 400 600 800 1000 Oscillator Frequency f OSC (kHz) Duty Cycle2 vs. DTC2 pin Voltage (%) 100 80 60 40 20 for f OSC Duty Cycle2 vs. Oscillator Frequency (%) 100 80 60 0.05V step (CH2, V =3.3V, Ta=25 C) + o (CH2, V+=3.3V, Ta=25oC) V DTC2 =0.85V UTY_2 Duty Cycle2 M D = Duty Cycle2 M D AX AX UTY_2 40 20 V DTC2 300kHz, 500kHz, 700kHz, 1MHz =0.3V 0 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 DTC2 pin Voltage VDTC2 (V) 1 0 200 400 600 800 1000 Oscillator Frequency f OSC (kHz) 60 Voltage Gain Av (dB) 45 Error Amplifier Block Voltage Gain, Phase vs. Frequency + o (V =3.3V, Gain=40dB, Ta=25 C) 180 135 90 45 Gain 30 15 0 0.1 1 10 100 1000 Frequency f (kHz) 0 10000 Ver.2010-03-31 Phase Φ (deg) Phase -9- NJU7680 ■TYPICAL CHARACTERISTICS Output Block Output High Level ON Resistance vs. Temperature (Io=-20mA) Output Low Level ON Resistance R ( Ω) Output Block Output Low Level ON Resistance vs. Temperature (Io=+20mA) Output High Level ON Resistance R ( Ω) 20 15 10 5 0 -50 20 15 V+=2.3V V =3.3V V =7V + + V+=2.3V 10 5 0 -50 V =3.3V V =7V + + OH OL -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) Soft Start Time vs. Temperature (kHz) 6 Soft Start Time Tss (ms) 5.5 5 4.5 4 3.5 3 2.5 2 -50 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) (V =3.3V) + Oscillator Frequency vs. Temperature 760 740 720 700 680 660 640 -50 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) (V+=3.3V, R =47kΩ) T Oscillator Frequency f OSC Reference Voltage vs. Temperature Voltage Regulator Block Output Voltage vs. Temperature (V) 2.04 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) (V+=3.3V, IREG =0mA) 1.015 (V) 1.01 1.005 1 0.995 0.99 0.985 -50 (V+=3.3V) -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) Regulator Output Voltage V Reference Voltage V B REG - 10 - Ver.2010-03-31 NJU7680 ■TYPICAL CHARACTERISTICS Quiescent Current vs. Temperature (mA) ( µA) 2 1.5 1 0.5 0 -50 IDD1 (V+=3.3V, R =47kΩ) T Standby Current vs. Temperature 3 2.5 2 1.5 1 0.5 0 -50 IDD_STB1 (V+=3.3V, R =47kΩ) T I DD_STB1 :V CE1 =V CE2 =0V Quiescent Current I IDD2 Standby Current I DD_STB DD IDD_STB2: RT=OPEN I DD_STB2 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) 2.4 Threshold Voltage (V) 2.2 2 1.8 1.6 1.4 -50 Under Voltage Lockout Block vs. Temperature VT_ON V V 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.2010-03-31 - 11 -