NJU7691

NJU7691 300mA Synchronous Step-Down switching regulator IC ■GENERAL DESCRIPTION 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. ■PACKAGE OUTLINE 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 2 3 4 8 7 6 5 NJU7691RB1 PIN FUNCTION 1. SW 2. V+ 3. FB 4. IN5. ON/OFF 6. RT 7. AGND 8. PGND Ver.2010-04-14 -1- NJU7691 ■BLOCK DIAGRAM V + 0.8V FB ER⋅AMP 0.2V OCP IN- 0.8V Vref PWM UVLO Soft Start Buffer SW Standby ON/OFF OSC 0.5V TSD 100kΩ ON/OFF High: ON Low : OFF (Standby) RT RT AGND PGND -2- 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 SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT VT_ON VT_OFF VHYS V+= L → H V+= H → L 1.9 1.8 60 2.0 1.9 100 2.1 2.0 – V V mV TSS VT_ON → Duty=80% 2 4 8 ms fOSC fDV fDT V =2.2V ~ 7V Ta=-40°C ~ +85°C + 630 – – 700 1 3 770 – – kHz % % VB IB AV GB IOM+ IOM- 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 Ver.2010-04-14 -3- NJU7691 ■ELECTRICAL CHARACTERISTICS (V+=VON/OFF=3.3V, RT=47kΩ, Ta=25°C) PARAMETER PWM Comparate Block 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 ON/OFF Block ON Control Voltage OFF Control Voltage General Characteristics Quiescent Current Standby Current VT_0 VT_50 MAXDUTY Duty=0% Duty=50% VFB=0.9V 0.16 0.44 100 0.22 0.50 – 0.28 0.56 – V V % SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT ROH ROL ILIM ILEAKH RPD-SW ISW=-200mA ISW=+200mA VON/OFF=0V – – 500 – 60 0.9 0.8 650 – 100 1.2 1.1 800 1 140 Ω Ω mA µA kΩ VON VOFF VON/OFF= L → H VON/OFF= H → L 1.6 0 – – V+ 0.3 V V IDD IDD_STB RL=Non Load VON/OFF=0V – – 1.3 – 1.6 5 mA µA ■ TYPICAL APPLICATIONS VIN RNF CNF CIN L VOUT 4 3 2 1 CFB R2 SBD COUT RFB IN- FB V + SW NJU7691 ON/ OFF 5 RT 6 AGND PGND 7 8 R1 RT ON/OFF High: ON Low: OFF (Standby) -4- Ver.2010-04-14 NJU7691 ■TYPICAL CHARACTERISTICS Oscillation Frequency vs. Timing Resistance Oscillation Frequency vs. Operating Voltage Oscillation Frequency fosc (kHz) 740 720 700 680 660 (R =47kΩ, Ta=25 C) T o Oscillation Frequency f OSC (kHz) 1000 (V =3.3V, Ta=25 C) + o 100 10 100 Timing Resistance R (kΩ) T 0 2 4 6 Operating Voltage V+ (V) 8 Reference Voltage vs. Operating Voltage (mA) 0.82 Reference Voltage V (V) B (RT=47kΩ, Ta=25 C) o Switching Current Limit vs. Operating Voltage 900 800 700 600 500 400 (RT=47kΩ, Ta=25 C) o 0.8 0.79 0.78 Switching Current Limit I 0.81 LIM 0 2 4 6 Operating Voltage V+ (V) 8 0 2 4 6 Operating Voltage V+ (V) 8 Quiescent Current vs. Operating Voltage (mA) (nA) Standby Current vs. Operating Voltage 100 10 1 0.1 0.01 (V ON/OFF 3 2.5 2 1.5 1 0.5 0 0 (R =47kΩ, R =Non Load, Ta=25 C) T L o =0V, Ta=25 C) o Quiescent Current I 2 4 6 Operating Voltage V+ (V) 8 Standby Current I DD_STB DD 0.001 0 2 4 6 Operating Voltage V+ (V) 8 Ver.2010-04-14 -5- NJU7691 ■TYPICAL CHARACTERISTICS Error Amplifier Block Voltage Gain, Phase vs. Frequency 60 Voltage Gain Av (dB) 45 Gain 30 15 0 0.1 90 45 0 10000 (V =3.3V, Gain=40dB, Ta=25 C) + o 180 135 1 10 100 1000 Frequency f (kHz) Output Block Output High Level ON Resistance Output High Level ON Resistance (W) R 2 1.6 1.2 0.8 0.4 0 1 10 100 Switching Current ISW (mA) 1000 Output Block Output Low Level ON Resistance Output Low Level ON Resistance ROL (Ω) 2 1.6 1.2 0.8 0.4 0 1 10 100 Switching Current I (mA) SW Phase Φ (deg) Phase vs. Switching Current (Ta=25 C) V+=2.2V V =3.3V V+=7V + o vs. Switching Current (Ta=25 C) V+=2.2V V =3.3V V+=7V + o OH 1000 Output High Level ON Resistance ROH (Ω) Output Low Level ON Resistance ROL (Ω) 3 2.5 2 1.5 1 0.5 Output Block Output High Level ON Resistance vs. Temperature (Isw=-200mA) V+=2.2V V =3.3V V =7V + + 3 Output Block Output Low Level ON Resistance vs. Temperature (Isw=+200mA) V+=2.2V V+=3.3V V =7V + 2.5 2 1.5 1 0.5 0 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (oC) 0 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (oC) -6- Ver.2010-04-14 NJU7691 ■TYPICAL CHARACTERISTICS Soft Start Time vs. Temperature 8 Soft Start Time Tss (ms) 7 6 5 4 3 2 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (oC) (V+=3.3V) Reference Voltage vs. Temperature 0.82 Reference Voltage V (V) (V+=3.3V, RT=47kΩ) 0.81 B 0.8 0.79 0.78 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (oC) Oscillator Frequency vs. Temperature (kHz) Switching Current Limit ILIM (mA) 760 740 720 700 680 660 (V+=3.3V, R =47kΩ) T 1000 900 800 700 600 500 400 300 Switching Current Limit vs. Temperature (RT=47kΩ) Oscillator Frequency f OSC V+=2.2V V+=3.3V V =7V + 640 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (oC) 200 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (oC) High Side SW Leak Current vs. Temperature High Side SW Leak Current ILEAKH (µA) 3 2.5 2 1.5 1 0.5 0 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (oC) (V+=3.3V, VON/OFF =0V, R =47kΩ) T 2.1 Threshold Voltage (V) 2.05 2 1.95 1.9 1.85 Under Voltage Lockout Block vs. Temperature VT_ON V T_OFF 1.8 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (oC) Ver.2010-04-14 -7- NJU7691 ■TYPICAL CHARACTERISTICS Quiescent Current vs. Temperature T Standby Current vs. Temperature (µA) 10 1 0.1 0.01 0.001 (V+=3.3V, VON/OFF =0V) (mA) 2 (V+=3.3V, R =47kΩ) Quiescent Current I DD 1.5 1 0.5 0 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (oC) Standby Current I DD_STB 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