NJU7691 300mA Synchronous Step-Down switching regulator IC ■GENERAL DESCRIPTION ■PACKAGE OUTLINE The NJU7691 is a synchronous rectification type switching regulator IC with a power MOSFET (300mA output). It has an over current detection and an overheat protection circuit. Therefore, the circuit can be configured with few external parts. The output voltage can be set from 0.8V. It is suitable for supplying power to a digital chip and a logic IC with low voltage. NJU7691RB1 ■FEATURES ● 300mA Synchronous Step-Down ● PWM switching control ● Operating Voltage 2.2V to 7V ● Wide Oscillator Range 300kHz to 1MHz ● Maximum Duty Cycle 100% ● Stand-by Current 5µA max. ● Soft-Start Function 4ms typ. ● Over Current Protection ● C-MOS Technology ● Package Outline NJU7691RB1 : TVSP8 ■PIN CONFIGURATION 1 8 2 7 3 6 4 5 NJU7691RB1 Ver.2010-04-14 PIN FUNCTION 1. SW 2. V+ 3. FB 4. IN5. ON/OFF 6. RT 7. AGND 8. PGND -1- NJU7691 ■BLOCK DIAGRAM V + 0.8V FB ER⋅AMP 0.2V IN- OCP 0.8V Vref PWM UVLO Soft Start Buffer SW Standby ON/OFF 100kΩ OSC TSD 0.5V ON/OFF High: ON Low : OFF (Standby) -2- RT AGND PGND RT Ver.2010-04-14 NJU7691 ■ABSOLUTE MAXIMUM RATINGS (Ta=25°C) PARAMETER SYMBOL Supply Voltage V+ ON/OFF pin Voltage VON/OFF Power Dissipation PD Operating Temperature Range Topr Storage Temperature Range Tstg MAXIMUM RATINGS +8 +8 580 (*1) -40 ~ +85 -40 ~ +150 UNIT V V mW °C °C (*1): Mounted on glass epoxy board based on EIA/JEDEC. (76.2 × 114.3 × 1.6mm: 2-Layers) ■RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL Operating Voltage V+ Output Current (*2) IOUT Oscillator Timing Resistor RT Oscillation Frequency fOSC (*2): Steady Operating MIN. 2.2 – 30 300 TYP. – – 47 700 MAX. 7 300 120 1,000 UNIT V mA kΩ kHz ■ELECTRICAL CHARACTERISTICS (V+=VON/OFF=3.3V, RT=47kΩ, Ta=25°C) PARAMETER Under Voltage Lockout Block ON Threshold Voltage OFF Threshold Voltage Hysteresis Voltage Soft Start Block Soft Start Time Oscillator Block Oscillation Frequency Oscillate Supply Voltage Fluctuations Oscillate Temperature Fluctuations Error Amplifier Block Reference Voltage Input Bias Current Open Loop Gain Gain Bandwidth Product Output Source Current Output Sink Current Ver.2010-04-14 SYMBOL VT_ON VT_OFF VHYS TSS TEST CONDITION V+= L → H V+= H → L VT_ON → Duty=80% fOSC + MIN. TYP. MAX. UNIT 1.9 1.8 60 2.0 1.9 100 2.1 2.0 – V V mV 2 4 8 ms 630 700 770 kHz fDV V =2.2V ~ 7V – 1 – % fDT Ta=-40°C ~ +85°C – 3 – % VFB=1V, VIN-=0.7V VFB=1V, VIN-=0.9V -1.0% -0.1 – – 20 1 0.8 – 80 1 35 2.5 +1.0% 0.1 – – 50 5 V µA dB MHz µA mA VB IB AV GB IOM+ IOM- -3- NJU7691 ■ELECTRICAL CHARACTERISTICS (V+=VON/OFF=3.3V, RT=47kΩ, Ta=25°C) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT 0.16 0.44 100 0.22 0.50 – 0.28 0.56 – V V % PWM Comparate Block VT_0 VT_50 MAXDUTY Input Threshold Voltage Maximum Duty Cycle Output Block Output High Level ON Resistance Output Low Level ON Resistance Switching Current Limit High Side SW Leak Current Output Pull-Down Resistance Duty=0% Duty=50% VFB=0.9V ROH ISW=-200mA – 0.9 1.2 Ω ROL ISW=+200mA – 0.8 1.1 Ω VON/OFF=0V 500 – 60 650 – 100 800 1 140 mA µA kΩ VON/OFF= L → H VON/OFF= H → L 1.6 0 – – V+ 0.3 V V – – 1.3 – 1.6 5 mA µA ILIM ILEAKH RPD-SW ON/OFF Block ON Control Voltage OFF Control Voltage VON VOFF General Characteristics Quiescent Current Standby Current IDD RL=Non Load VON/OFF=0V IDD_STB ■ TYPICAL APPLICATIONS VIN RNF CIN CNF L VOUT 4 3 2 IN- FB V + CFB 1 R2 SW SBD COUT RFB NJU7691 ON/ OFF RT 5 6 AGND PGND 7 R1 8 RT ON/OFF High: ON Low: OFF (Standby) -4- Ver.2010-04-14 NJU7691 ■TYPICAL CHARACTERISTICS Oscillation Frequency vs. Operating Voltage Oscillation Frequency vs. Timing Resistance o o Oscillation Frequency fosc (kHz) (V =3.3V, Ta=25 C) 1000 Oscillation Frequency f OSC (kHz) + 100 10 (R =47kΩ, Ta=25 C) T 740 720 700 680 660 100 Timing Resistance R (kΩ) 0 2 4 6 Operating Voltage V+ (V) T Reference Voltage vs. Operating Voltage Switching Current Limit vs. Operating Voltage o (RT=47kΩ, Ta=25 C) o (mA) LIM 0.81 0.8 0.79 0.78 0 2 4 6 Operating Voltage V+ (V) (RT=47kΩ, Ta=25 C) 900 800 Switching Current Limit I B Reference Voltage V (V) 0.82 700 600 500 400 8 0 Quiescent Current vs. Operating Voltage L (nA) 2 1.5 1 0.5 0 Ver.2010-04-14 0 2 4 6 Operating Voltage V+ (V) 8 (V 100 DD_STB 2.5 Standby Current I (mA) DD Quiescent Current I (R =47kΩ, R =Non Load, Ta=25 C) T 2 4 6 Operating Voltage V+ (V) 8 Standby Current vs. Operating Voltage o 3 8 o ON/OFF =0V, Ta=25 C) 10 1 0.1 0.01 0.001 0 2 4 6 Operating Voltage V+ (V) 8 -5- NJU7691 ■TYPICAL CHARACTERISTICS Error Amplifier Block Voltage Gain, Phase vs. Frequency + Phase 45 135 Gain 30 90 15 45 0 0.1 1 Output Block Output Low Level ON Resistance o + V =3.3V V+=7V 1.2 0.8 0.4 0 Output High Level ON Resistance ROH (Ω) 1 -6- Output Low Level ON Resistance ROL (Ω) V+=2.2V 3 2.5 10 100 Switching Current ISW (mA) V+=2.2V + 2 V+=2.2V V =3.3V + V =7V 1.5 1 0.5 0 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (oC) + 1.6 V =3.3V V+=7V 1.2 0.8 0.4 0 1 1000 Output Block Output High Level ON Resistance vs. Temperature (Isw=-200mA) vs. Switching Current (Ta=25 C) 2 10 100 Switching Current I (mA) 1000 SW Output Low Level ON Resistance ROL (Ω) OH Output High Level ON Resistance (W) R o vs. Switching Current (Ta=25 C) 1.6 0 10000 10 100 1000 Frequency f (kHz) Output Block Output High Level ON Resistance 2 180 Phase Φ (deg) Voltage Gain Av (dB) o (V =3.3V, Gain=40dB, Ta=25 C) 60 3 2.5 2 Output Block Output Low Level ON Resistance vs. Temperature (Isw=+200mA) V+=2.2V V+=3.3V + V =7V 1.5 1 0.5 0 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (oC) Ver.2010-04-14 NJU7691 ■TYPICAL CHARACTERISTICS Reference Voltage vs. Temperature Soft Start Time vs. Temperature (V+=3.3V) (V+=3.3V, RT=47kΩ) 0.82 Reference Voltage V (V) 7 B Soft Start Time Tss (ms) 8 6 5 4 3 2 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (oC) 0.81 0.8 0.79 0.78 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (oC) 760 (V+=3.3V, R =47kΩ) T 740 720 700 680 660 640 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (oC) Switching Current Limit ILIM (mA) Oscillator Frequency f OSC (kHz) Oscillator Frequency vs. Temperature 1000 900 800 700 600 500 V+=2.2V 400 V+=3.3V 300 V =7V 2.5 2 1.5 1 0.5 0 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (oC) Ver.2010-04-14 2.1 Threshold Voltage (V) High Side SW Leak Current ILEAKH (µA) 3 T + 200 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (oC) High Side SW Leak Current vs. Temperature (V+=3.3V, VON/OFF =0V, R =47kΩ) Switching Current Limit vs. Temperature (RT=47kΩ) Under Voltage Lockout Block vs. Temperature 2.05 2 1.95 1.9 VT_ON V T_OFF 1.85 1.8 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (oC) -7- NJU7691 ■TYPICAL CHARACTERISTICS Standby Current vs. Temperature 1.5 1 0.5 0 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (oC) 10 (µA) T DD_STB 2 (V+=3.3V, R =47kΩ) Standby Current I Quiescent Current I DD (mA) Quiescent Current vs. Temperature (V+=3.3V, VON/OFF =0V) 1 0.1 0.01 0.001 0.0001 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (oC) [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. -8- Ver.2010-04-14