NJU7690 High Efficiency Synchronous Step-Down switching regulator IC ■ GENERAL DESCRIPTION ■ PACKAGE OUTLINE The NJU7690 is a high efficiency synchronous step-down switching regulator control IC. It offers high efficiency power supply circuits in applications by synchronous rectification. The NJU7690 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 a small and thin 10-lead MSOP (TVSP) package. It is suitable for battery powered applications. ■ FEATURES ● Synchronous Rectification ● PWM switching control ● Standby Function ● Operating Voltage 2.2V to 8V ● Wide Oscillator Range 300kHz to 1MHz ● Maximum Duty Cycle 100% ● Quiescent Current Operating :800µA typ. Standby :1µA max. ● Soft-Start Function Internal : 16ms typ. or adjustable ● Dead Time Control ● Timer Latch for Short Circuit Protection ● C-MOS Technology ● Package Outline NJU7690RB2 : TVSP10 NJU7690RB2 (MSOP10 (TVSP10)) ■ PRODUCT VARIATION NJU7690 Synchronous rectification NJU7631 PWM/PFM Light Load to Efficiency NJU7630 PWM Control ■ PIN CONFIGURATION 1 10 2 9 3 8 4 7 5 6 NJU7690RB2 Ver.2012-08-03 PIN FUNCTION 1. OUTP 2. V+ 3. FB 4. IN5. SCP 6. ON/OFF 7. DTC 8. RT 9. GND 10. OUTN -1- NJU7690 ■ BLOCK DIAGRAM + V FB 0.8V ER⋅AMP IN1V 0.2V Vref Soft Start UVLO Latch PWM 2µA SCP SCP Buffer OUTN 0.5V 1V 0.5 A RT Standby ON/OFF 1V GND DTC RT ON/OFF RT -2- OUTP Shoot Through Prevention OSC 2kΩ Buffer High: ON Low : OFF (Standby) Ver.2012-08-03 NJU7690 ■ ABSOLUTE MAXIMUM RATINGS (Ta=25°C) PARAMETER SYMBOL Supply Voltage V+ Output Pin Current IO Power Dissipation PD Operating Temperature Range TOPR Storage Temperature Range TSTG MAXIMUM RATINGS +9 ±50 MSOP8 (TVSP8) :320 -40 to +85 -40 to +125 ■ RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL MIN. Operating Voltage V+ 2.2 Oscillator Timing Resistor RT 30 Oscillation Frequency fOSC 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 MAX. 8 120 1,000 (Ta=25°C) UNIT V kΩ kHz (V+= VON/OFF=3.3V, RT=47kΩ, Ta=25°C) ■ ELECTRICAL CHARACTERISTICS PARAMETER UNIT V mA mW °C °C 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 0.20 0.45 0.70 V -10% 630 0.5 700 +10% 770 V kHz VRT fOSC fDV V+=2.2V to 8V – 1 – % fDT Ta=-40°C to +85°C – 3 – % -3- NJU7690 (V+= VON/OFF=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 -1.0% -0.1 – – 12 2.5 0.10 1.00 – 80 1 40 9 0.16 +1.0% 0.1 – – 70 16 0.22 V µA dB MHz mA mA mA 0.10 0.4 100 35 0.16 0.5 – 50 0.22 0.6 – 65 V V % % PWM Comparate Block Input Threshold Voltage Maximum Duty Cycle Output Block OUTP Output High Level ON Resistance OUTP Output Low Level ON Resistance OUTN Output High Level ON Resistance OUTN Output Low Level ON Resistance OUTP-OUTN Rise Dead Time OUTN-OUTP Fall Dead Time VT_0 VT_50 MAXDUTY_1 MAXDUTY_2 Duty=0% Duty=50% VFB=0.9V VFB=0.9V, RDTC=47kΩ ROPH IO=-20mA – 10 20 Ω ROPL IO=+20mA – 5 10 Ω RONH IO=-20mA – 10 20 Ω RONL IO=+20mA – 5 10 Ω tdr 55 85 120 ns tdf 45 75 110 ns 1.6 0 – – V+ 0.3 V V – – 800 – 1200 1.0 µA µA ON/OFF Block ON Control Voltage OFF Control Voltage VON VOFF VON/OFF= L → H VON/OFF= H → L General Characteristics Quiescent Current Standby Current IDD IDD_STB RL=Non Load VON/OFF=0V -4- Ver.2012-08-03 NJU7690 ■ TYPICAL APPLICATIONS Step-Down Converter VIN RNF 5 SCP CSCP CNF C 4 3 2 IN- FB V + 1 CIN GND Pch FET OUTP L VOUT NJU7690 ON/ OFF DTC 6 7 RT 8 SBD GND OUTN 9 10 COUT R2 Nch FET R1 ON/OFF High : ON Low : OFF (Standby) CS RDTC RT GND Ver.2012-08-03 -5- NJU7690 ■ TYPICAL CHARACTERISTICS Oscillation Frequency fosc (kHz) 1000 100 Timing Resistance RT (kΩ) 720 700 680 660 Duty Cycle vs. R DTC T Reference Voltage V (V) B 60 40 20 0 20 40 60 80 100 Dead Time Control Resistance RDTC (kΩ) Voltage Gain Av (dB) 1.002 1 0.998 0.996 0 2 4 6 8 Operating Voltage V+ (V) Error Amplifier Block Voltage Gain, Phase vs. Frequency + o (V =3.3V, Gain=40dB, Ta=25 C) 60 45 Phase 135 Gain 90 15 45 1 10 100 1000 Frequency f (kHz) 10 180 30 0 0.1 -6- 10 (Ta=25oC) 1.004 80 0 2 4 6 8 Operating Voltage V+ (V) (V =3.3V, R =47kΩ, Ta=25 C) AX Duty Cycle M D UTY (%) 100 0 Reference Voltage vs. Operating Voltage o + (RT=47kΩ, Ta=25oC) 740 Phase Φ (deg) Oscillation Frequency f 100 10 Oscillation Frequency vs. Operating Voltage (V+=3.3V, Ta=25oC) OSC (kHz) Oscillation Frequency vs. Timing Resistance 0 10000 Ver.2012-08-03 NJU7690 ■ TYPICAL CHARACTERISTICS Quiescent Current vs. Operating Voltage Standby Current vs. Operating Voltage o (R =47kΩ, R =Non Load, Ta=25 C) T (nA) DD_STB 1200 Standby Current I 1000 800 600 400 200 2 4 6 8 Operating Voltage V+ (V) 20 V+=1.95V 10 V+=3.3V V+=8V 0 -50 0 0 14 Error Amplifier Block Output Source Current vs. Temperature (VFB=1V, VIN-=0.9V) (mA) 1000 V+=8V 100 + 10 1 -50 Ver.2012-08-03 V =3.3V V+=1.95V -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) 2 4 6 8 Operating Voltage V+ (V) 10 Output Block (P&N) Output Low Level ON Resistance vs. Temperature (Io=+20mA) V+=1.95V 10 OM- Output Source Current I 0.2 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) OM+ (mA) 5 =0V, Ta=25oC) 0.4 12 15 ON/OFF 0.6 10 Output Block (P&N) Output High Level ON Resistance vs. Temperature (Io=-20mA) T 0.8 Output Low Level ON Resistance ROL (Ω) 0 OH Output High Level ON Resistance (Ω) R 0 (R =47kΩ, V 1 Output Sink Current I Quiescent Current IDD (µA) 1400 L 8 V+=3.3V 6 4 2 0 -50 0.2 V+=8V -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) Error Amplifier Block Output Sink Current vs. Temperature (VFB=1V, VIN- =1.1V) 0.15 V+=1.95V, 3.3V, 8V 0.1 0.05 0 -50 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) -7- NJU7690 ■ TYPICAL CHARACTERISTICS Soft Start Time vs. Temperature Reference Voltage vs. Temperature + (V =3.3V) (V) 22 1.005 B 20 18 16 14 12 10 8 -50 1 0.995 0.99 -50 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) Oscillator Frequency vs. Temperature (V =3.3V, R =47kΩ) 2.06 T 740 Threshold Voltage (V) Oscillator Frequency fOSC (kHz) + 760 720 700 680 660 640 -50 (V+=3.3V) 1.01 Reference Voltage V Soft Start Time Tss (ms) 24 Under Voltage Lockout Block vs. Temperature 2.02 V T_ON 1.98 1.94 VT_OFF 1.9 1.86 -50 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) ON/OFF Control Voltage VON/OFF (V) ON/OFF Control Voltage vs. Temperature -8- 1 (V+=3.3V) 0.95 0.9 VON 0.85 0.8 V OFF 0.75 0.7 0.65 0.6 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) Ver.2012-08-03 NJU7690 ■ TYPICAL CHARACTERISTICS Standby Current vs. Temperature Quiescent Current vs. Temperature + (V =3.3V, R =47kΩ) 800 600 400 200 0 -50 2 T Standby Current IDD_STB (µA) Quiescent Current IDD (µA) 1000 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) (V+=3.3V, R =47kΩ, V T ON/OFF =0V) 1.5 1 0.5 0 -50 -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.2012-08-03 -9-