NJW4150 Internal 34V MOSFET Switching Regulator IC for Buck Converter GENERAL DESCRIPTION ■ PACKAGE OUTLINE The NJW4150 is a switching regulator IC for buck converter with 34V, 450mA MOSFET. It corresponds to high frequency oscillating, wide input voltage and Low ESR Output Capacitor (MLCC). Therefore, the NJW4150 can realize downsizing of applications with a few external parts. Also, it has a soft start function, over current protection and thermal shutdown circuit. It is suitable for power supply circuit of Car Accessory, Office Automation Equipment, Industrial Instrument and so on. NJW4150RB1 FEATURES Absolute Maximum Rating 42V Operating Voltage Range 6V to 34V Switching Current 450mA min. PWM switching control Applicable for Ceramic Capacitor (MLCC) Oscillation Frequency 1MHz typ. (A ver.) Soft Start Function 4ms typ. Over Current and Thermal Shutdown Protection Standby Function Package Outline NJW4150RB1 : TVSP8 ■PIN CONFIGURATION 1 8 2 7 3 6 4 5 NJW4150RB1 Ver.2011-02-25 PIN FUNCTION 1. SW 2. N.C. 3. V+ 4. ON/OFF 5. FB 6. IN7. N.C. 8. GND -1- NJW4150 ■BLOCK DIAGRAM V+ UVLO ON/OFF High: ON Low : OFF (Standby) OCP Pulse by Pulse Standby ON/OFF Low Frequency Control FB PWM OSC ER⋅AMP Buffer IN- SW Vref Soft Start TSD 1.0V GND PRODUCT VERSION PART NUMBER NJW4150RB1-A Oscillation Frequency 1,000kHz ABSOLUTE MAXIMUM RATINGS (Ta=25°C) PARAMETER SYMBOL Supply Voltage V+ SW pin Voltage VSW IN- pin Voltage VINON/OFF pin Voltage VON/OFF Power Dissipation PD Junction Temperature Range Operating Temperature Range Storage Temperature Range Tj Topr Tstg MAXIMUM RATINGS +42 +42 -0.3 ~ +6 +42 580 (*1) 780 (*2) -40 ~ +150 -40 ~ +85 -40 ~ +150 UNIT V V V V mW °C °C °C (*1): Mounted on glass epoxy board based on EIA/JEDEC. (76.2mm × 114.3mm × 1.6mm: 2 Layers FR-4) (*2): Mounted on glass epoxy board based on EIA/JEDEC. (76.2 mm× 114.3 mm× 1.6mm: 4 Layers FR-4, Internal foil area: 74.2 × 74.2mm) RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL MIN. + Operating Voltage V 6 -2- TYP. – MAX. 34 UNIT V Ver.2011-02-25 NJW4150 ELECTRICAL CHARACTERISTICS (V+=VON/OFF=24V, 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 Oscillation Frequency OCP operates Oscillate Supply Voltage Fluctuations Oscillate Temperature Fluctuations Error Amplifier Block Reference Voltage Input Bias Current SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT VT_ON VT_OFF VHYS V+ = L → H V+ = H → L 5.6 5.4 150 5.8 5.6 200 6.0 5.8 – V V mV TSS VB=0.95V 2 4 8 ms fOSC A version VIN-=0.9V, VFB=0.5V 900 1,000 1,100 kHz VIN-=0V, VFB=0.5V – 333 – kHz fDV V+=6V to 34V – 1 – % fDT Ta=-40°C to +85°C – 5 – % -1.0% -0.1 1.00 – +1.0% 0.1 V µA VIN-=0.9V 100 – – % ISW=300mA – 450 1.6 600 1.8 750 Ω mA – – 1 µA 1.6 0 – – V+ 0.3 V V – 2.3 2.7 mA – – 40 µA fOSC_LIM VB IB PWM Comparator Block Maximum Duty Cycle MAXDUTY Output Block Output ON Resistance Switching Current Limit RON ILIM SW Leak Current ILEAK VON/OFF=0V, V+=42V, VSW=0V ON/OFF Block ON Control Voltage OFF Control Voltage VON VOFF VON/OFF= L → H VON/OFF= H → L General Characteristic Quiescent Current Standby Current Ver.2011-02-25 IDD IDD_STB RL=No Load, VIN-= 0.9V, VFB=0.5V VON/OFF=0V -3- NJW4150 TYPICAL APPLICATIONS + V CIN L ON/OFF ON/OFF High: ON Low: OFF (Standby) + V VOUT SW NJW4150 CFB FB IN- GND SBD R2 COUT R1 CNF RNF -4- Ver.2011-02-25 NJW4150 ■TYPICAL CHARACTERISTICS LIM 1100 1050 1000 950 900 Switching Current Limit vs. Operating Voltage (mA) (Ta=25oC) Switching Current Limit I Oscillation Frequency fosc (kHz) Oscillation Frequency vs. Operating Voltage 0 10 20 30 + Operating Voltage V (V) 40 700 650 600 550 500 450 Soft Start Time vs. Operating Voltage (V =0.95V, Ta=25 C) B (mA) DD 6 Quiescent Current I Soft Start Time Tss (ms) 7 5 4 3 2 0 10 20 30 + Operating Voltahe V (V) 0 10 20 30 + Operating Voltage V (V) 40 Quiescent Current vs. Operating Voltage o 8 (Ta=25oC) 750 40 (R =No Load, V =0.5V, Ta=25oC) L 4 IN- 3 2 1 0 0 10 20 30 + Operating Voltage V (V) 40 Error Amplifier Block Voltage Gain, Phase vs. Frequency Voltage Gain Av (dB) 45 Phase 180 135 Gain 30 90 15 45 0 0.1 Ver.2011-02-25 o 1 10 100 1000 Frequency f (kHz) Phase Φ (deg) + (V =24V, Gain=40dB, Ta=25 C) 60 0 10000 -5- NJW4150 ■TYPICAL CHARACTERISTICS Oscillator Frequency vs. Temperature (mA) 1000 950 900 -50 -25 0 25 50 75 100 125 150 o Ambient Temperature Ta ( C) 700 650 600 550 500 450 -50 -25 0 25 50 75 100 125 150 o Ambient Temperature Ta ( C) Soft Start Time vs. Temperature Reference Voltage vs. Temperature + (V =24V, V =0.95V) B 1.005 B 7 6 5 4 3 1 0.995 2 1.5 0.1 ( µA) 2.5 V+=6V V+=24V,34V 1 0.5 0 -50 -25 0 25 50 75 100 125 150 o Ambient Temperature Ta ( C) -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) SW Leak Current vs. Temperature Output ON Resistance vs. Temperature (I SW =300mA) LEAKH 3 0.99 -50 SW Leak Current I Output ON Resistance R ON (Ω) 2 -50 -25 0 25 50 75 100 125 150 o Ambient Temperature Ta ( C) -6- (V+=24V) (V) 1.01 Reference Voltage V Soft Start Time Tss (ms) 8 + (V =24V) 750 LIM 1050 Switching Current Limit I OSC (kHz) 1100 Oscillator Frequency f Switching Current Limit vs. Temperature (V+=24V) (V +=42V, V ON/OFF =0V, V SW =0V) 0.08 0.06 0.04 0.02 0 -50 -25 0 25 50 75 100 125 150 o Ambient Temperature Ta ( C) Ver.2011-02-25 NJW4150 ■TYPICAL CHARACTERISTICS DD_STB V+=34V 2 V+=6V V+=24V 1 6 5.9 Standby Current I (mA) Quiescent Current I DD 3 0 -50 -25 0 25 50 75 100 125 150 o Ambient Temperature Ta ( C) Threshold Voltage (V) 50 ( µA) 4 Quiescent Current vs. Temperature (RL= No Load, VIN-=0.5V) 40 30 Standby Current vs. Temperature (VON/OFF=0V) V+=34V V+=24V 20 10 V+=6V 0 -50 -25 0 25 50 75 100 125 150 o Ambient Temperature Ta ( C) Under Voltage Lockout Block vs. Temperature V T_ON 5.8 5.7 5.6 5.5 VT_OFF 5.4 -50 -25 0 25 50 75 100 125 150 o Ambient Temperature Ta ( C) Ver.2011-02-25 -7- NJW4150 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. -8- Ver.2011-02-25