NJM2309 Switching Regulator Control IC for Step-Down ■GENERAL DESCRIPTION ■PACKAGE OUTLINE The NJM2309 is a step-down Switching regulator IC with a wide operating voltage range. It features an open collector driver that can provide step-down applications. Internal soft-start function and timer latch function for short circuit protection are included, requiring no external components. ■FEATURES ● PWM switching control ● Operating Voltage 3.6V to 32V ● Wide Oscillator Range 5kHz to 500 kHz ● Duty Cycle 0% to 100% ● Soft Start function ● Timer Latch for Short Circuit Protection ● Under Voltage Lockouts (U.V.LO) ● Bipolar Technology ● Package Outline NJM2309M NJM2309E NJM2309V NJM2309M ( DMP8 ) NJM2309E ( SOP8 ) NJM2309V ( SSOP8 ) : DMP8 : SOP8 JEDEC 150mil : SSOP8 ■BLOCK DIAGRAM REF 8 CT CS V+ 7 6 5 30µA VREF PIN FUNCTION 1. IN 2. F.B 3. GND 4. OUT 5. V + 6. CS 7. CT 8. REF OSC L.O U.V.LO S.C.P ER⋅AMP 0.52V PWM 1 2 - F.B IN Ver.2011-12-08 3 GND 4 OUT -1- NJM2309 ■ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL Input Voltage V+ Out pin Voltage VO_PIN Reference Output Current IOR Output Current IO Power Dissipation PD Operating Temperature Range Storage Temperature Range Topr Tstg ■RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL Operating Voltage V+ OUT pin Voltage VO_PIN Feed Back Resistor RNF Oscillator Timing Capacitor CT Oscillator Timing Resistor RT Oscillation Frequency fOSC (Ta=25°C) MAXIMUM RATINGS UNIT 36 V 36 V 10 mA 200 mA DMP8 : 375 mW SOP8 : 375 SSOP8 : 312 -40 ~ +85 °C -50 ~ 150 °C (V+=6V, Ta=25°C) MAX. UNIT 32 V 32 V – kΩ 22,000 pF 100 kΩ 500 kHz MIN. 3.6 – 100 220 10 5 (V+=6V, RT=33kΩ, CT=1,000pF, Ta=25°C) ■ELECTRICAL CHARACTERISTICS REFERENCE VOLTAGE BLOCK PARAMETER SYMBOL Output Voltage Line Regulation Load Regulation OSCILLATOR BLOCK PARAMETER Oscillation Frequency Oscillate Fluctuations1 (Line Fluctuations) Oscillate Fluctuations2 (Temp Fluctuations) ERROR AMPLIFIER BLOCK PARAMETER Reference Voltage Input Bias Current Open Loop Gain Gain Band width Product Maximum Output Voltage (F.B Pin) Output Source Current (F.B Pin) -2- MIN. TYP. MAX. UNIT 2.45 – – 2.50 6.8 5 2.55 20.7 30 V mV mV MIN. TYP. MAX. UNIT CT=1,000pF, RT=33kΩ 85 105 125 kHz fdv V+=3.6V to 32V – 1 – % fdt Ta=-40°C to +85°C – 5 – % MIN. TYP. MAX. UNIT 0.51 – – – VREF-0.2 – 0.52 5 90 0.6 – – 0.53 100 – – – 200 V nA dB MHz V mV 40 85 200 µA VREF LINE LOAD RATINGS IOR=1mA V+=3.6V ~ 32V, IOR=1mA IOR=0.1mA ~ 5.0mA SYMBOL fosc RATINGS SYMBOL RATINGS VB IB AV GB VOM+ VOM- RNF=100kΩ RNF=100kΩ IOM+ VOM=1V Ver.2011-12-08 NJM2309 (V+=6V, RT=33kΩ, CT=1,000pF, Ta=25°C) ■ELECTRICAL CHARACTERISTICS PWM COMPARATE BLOCK PARAMETER Input Threshold Voltage (F.B Pin) Input Threshold Voltage (F.B Pin) SYMBOL VTH0 VTH100 RATINGS MIN. TYP. MAX. UNIT duty·cycle=0%* – 0.40 0.50 V duty·cycle=100%* – 0.85 – V MIN. TYP. MAX. UNIT – 250 650 nA – 0.25 0.35 V – 0.7 – V MIN. TYP. MAX. UNIT 1.20 1.50 1.80 V 10 30 50 µA 1.20 1.50 1.80 V MIN. TYP. MAX. UNIT – – 60 2.70 2.52 180 – – – V V mV MIN. TYP. MAX. UNIT Output Sink Current =70mA – 0.35 0.75 V V+=32V, VO_PIN=32V – – 1 µA MIN. TYP. MAX. UNIT – – 1.6 5.5 2.2 10 mA mA SOFT START CIRCUIT BLOCK PARAMETER SYMBOL Input Bias Current (CS Pin) Input Threshold Voltage (CS Pin) Input Threshold Voltage (CS Pin) RATINGS IBCS VTHCS0 duty·cycle=0%* VTHCS100 duty·cycle=100%* SHORT CIRCUIT PROTECTION BLOCK PARAMETER SYMBOL Input Threshold Voltage (F.B Pin) Charge Current (CS Pin) Latch mode Threshold Voltage (CS Pin) RATINGS VTHPC ICHG CS Pin=0V, F.B Pin=2V VTHLA UNDER VOLTAGE LOCKOUT BLOCK PARAMETER SYMBOL ON Threshold Voltage OFF Threshold Voltage Hysteresis Voltage VTHON VTHOFF VHYS OUTPUT BLOCK PARAMETER SYMBOL L Level Output Voltage (OUT Pin) Leak Current VOL IO_LEAK RATINGS RATINGS GENERAL CHARACTERISTICS PARAMETER SYMBOL Quiescent Current Average Quiescent Current (*) ICCLA ICCAV RATINGS Latch Mode RL= ∞, duty·cycle=50% Duty·Cycle is defined as follows: Duty·Cycle=0%: IC output transistor is OFF. Duty·Cycle=100%: IC output transistor is ON. Ver.2011-12-08 -3- NJM2309 ■ TYPICAL APPLICATIONS V + Rsf Rsr Cs Rbe CT RT 8 7 VOUT L Q1 Rbc 6 R2 5 30uA VREF OSC L.O D1 U.V.LO CIN COUT S.C.P ER⋅AMP 0.52V PWM R1 1 GND -4- 2 RNF CNF 3 4 GND Ver.2011-12-08 NJM2309 ■TYPICAL CHARACTERISTICS L Level Output Voltage vs. Sink Current + + (V =6V, duty cycle=100%, Ta=25 C) 2 L Level Output Voltage VOL (V) Duty Cycle vs. CS Pin Voltage o 1.6 Duty Cycle α (%) 80 1.2 0.8 0.4 0 0 40 80 120 160 Sink Current ISINK (mA) 60 40 20 0 200 + (kHz) 100 CT=470pF C =1,000pF T C =3,300pF T 100 (V+=6V, Ta=25oC) 1000 OSC Oscillator Frequency f Oscillator Frequency fOSC (kHz) CT=220pF 10 10 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 CS Pin Voltage VTHCS (V) o (V =6V, Ta=25 C) 1000 0 Oscillator Frequency vs. Timing Capacitor Oscillator Frequency vs. Timing Resistor 100 RT=10kΩ RT=33kΩ 10 RT=100kΩ 1 100 Timing Resistor RT (kΩ) o (IOR=1mA, Ta=25 C) 2.51 2.5 2.49 2.48 0 10 20 30 + Operating Voltage V (V) 40 100000 (Ta=25oC) 10 Operating Current ICC (mA) Reference Voltage VREF (V) 2.52 1000 10000 Timing Capacitor CT (pF) Operating Current vs. Operating Voltage Reference Voltage vs. Operating Voltage Ver.2011-12-08 o (V =6V, F.B pin=1.2V, Ta=25 C) 100 8 ICCAV 6 4 ICCLA 2 0 0 10 20 30 + Operating Voltage V (V) 40 -5- NJM2309 ■TYPICAL CHARACTERISTICS 135 Gain 30 90 15 45 0 0.1 0 1 (V =6V, ISINK =70mA) (V) 0.7 OL Phase 45 + 180 L Level Output Voltage V Voltage Gain Av (dB) 60 L Level Output Voltage vs. Temperature Phase Φ (deg) Error Amplifier Block Voltage Gain, Phase vs. Frequency + o (V =6V, Gain=40dB, Ta=25 C) 0.6 0.5 0.4 0.3 0.2 0.1 0 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (oC) 10 100 1000 Frequency f (kHz) Oscillator Frequency vs. Temperature Referece Voltage vs. Temperature 115 110 105 100 95 90 85 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (oC) (V) 120 2.56 REF 125 + (V =6V, RT=33kΩ, CT=1,000pF) Referece Voltage V Oscillator Frequency fOSC (kHz) + (V =6V, IOR=1mA) 2.54 2.52 2.5 2.48 2.46 2.44 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (oC) Average Quiescent Current vs. Temperature Quiescent Current vs. Temperature (V =6V, RL= ∞ , duty cycle=50%, RT=33kΩ, CT=1,000pF) (Latch Mode, V =6V, RT=33kΩ, CT=1,000pF) 2 + + 6 4 2 0 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (oC) -6- 1.8 1.6 CCLA 8 Quiescent Current (mA) I CCAV Average Quiescent Current (mA) I 10 1.4 1.2 1 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (oC) Ver.2011-12-08 NJM2309 MEMO [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.2011-12-08 -7-