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| NJW4150 Internal 34V MOSFET Switching Regulator IC for Buck Converter GENERAL DESCRIPTION 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. PACKAGE OUTLINE 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 2 3 4 8 7 6 5 NJW4150RB1 PIN FUNCTION 1. SW 2. N.C. 3. V+ 4. ON/OFF 5. FB 6. IN7. N.C. 8. GND Ver.2011-02-25 -1- NJW4150 BLOCK DIAGRAM V+ ON/OFF High: ON Low : OFF (Standby) Standby ON/OFF UVLO OCP Pulse by Pulse Low Frequency Control PWM ERAMP OSC Buffer FB IN- SW Vref 1.0V Soft Start TSD GND PRODUCT VERSION PART NUMBER NJW4150RB1-A Oscillation Frequency 1,000kHz ABSOLUTE MAXIMUM RATINGS (Ta=25C) 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 x 114.3mm x 1.6mm: 2 Layers FR-4) (*2): Mounted on glass epoxy board based on EIA/JEDEC. (76.2 mmx 114.3 mmx 1.6mm: 4 Layers FR-4, Internal foil area: 74.2 x 74.2mm) RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL MIN. + Operating Voltage V 6 TYP. - MAX. 34 UNIT V -2- Ver.2011-02-25 NJW4150 ELECTRICAL CHARACTERISTICS (V+=VON/OFF=24V, Ta=25C) 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 PWM Comparator Block Maximum Duty Cycle Output Block Output ON Resistance Switching Current Limit SW Leak Current ON/OFF Block ON Control Voltage OFF Control Voltage General Characteristic Quiescent Current Standby Current IDD IDD_STB RL=No Load, VIN-= 0.9V, VFB=0.5V VON/OFF=0V - - 2.3 - 2.7 40 mA A 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 fOSC_LIM fDV fDT A version VIN-=0.9V, VFB=0.5V VIN-=0V, VFB=0.5V V+=6V to 34V Ta=-40C to +85C 900 - - - 1,000 333 1 5 1,100 - - - kHz kHz % % VB IB -1.0% -0.1 1.00 - +1.0% 0.1 V A MAXDUTY VIN-=0.9V 100 - - % RON ILIM ILEAK ISW=300mA VON/OFF=0V, V+=42V, VSW=0V - 450 - 1.6 600 - 1.8 750 1 mA A VON VOFF VON/OFF= L H VON/OFF= H L 1.6 0 - - V+ 0.3 V V Ver.2011-02-25 -3- NJW4150 TYPICAL APPLICATIONS V + CIN L ON/OFF V + VOUT SW ON/OFF High: ON Low: OFF (Standby) NJW4150 CFB FB INGND R2 SBD COUT R1 CNF RNF -4- Ver.2011-02-25 NJW4150 TYPICAL CHARACTERISTICS Oscillation Frequency vs. Operating Voltage Oscillation Frequency fosc (kHz) (mA) Switching Current Limit vs. Operating Voltage 750 700 650 600 550 500 450 0 10 20 30 + Operating Voltage V (V) 40 (Ta=25oC) 1100 1050 1000 950 900 (Ta=25oC) 0 10 20 30 + Operating Voltage V (V) 40 Soft Start Time vs. Operating Voltage 8 Soft Start Time Tss (ms) 7 6 5 4 3 2 0 10 20 30 + Operating Voltahe V (V) 40 (V =0.95V, Ta=25 C) B o Switching Current Limit I LIM Quiescent Current vs. Operating Voltage (mA) 4 3 2 1 0 (R =No Load, V =0.5V, Ta=25oC) L IN- Quiescent Current I DD 0 10 20 30 + Operating Voltage V (V) 40 Error Amplifier Block Voltage Gain, Phase vs. Frequency 60 Voltage Gain Av (dB) (V =24V, Gain=40dB, Ta=25 C) + o 180 Gain 30 15 0 0.1 90 45 0 10000 1 10 100 1000 Frequency f (kHz) Ver.2011-02-25 Phase (deg) 45 Phase 135 -5- NJW4150 TYPICAL CHARACTERISTICS Oscillator Frequency vs. Temperature (kHz) (mA) Switching Current Limit vs. Temperature 750 700 650 600 550 500 450 -50 -25 0 25 50 75 100 125 150 o Ambient Temperature Ta ( C) (V =24V) + 1100 1050 (V+=24V) OSC 1000 950 900 -50 -25 0 25 50 75 100 125 150 o Ambient Temperature Ta ( C) 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 o Ambient Temperature Ta ( C) (V =24V, V =0.95V) B + Switching Current Limit I Oscillator Frequency f LIM Reference Voltage vs. Temperature 1.01 (V) 1.005 (V+=24V) Reference Voltage V B 1 0.995 0.99 -50 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) () 3 2.5 2 1.5 1 0.5 Output ON Resistance vs. Temperature (I SW =300mA) (A) SW Leak Current vs. Temperature 0.1 0.08 0.06 0.04 0.02 0 -50 -25 0 25 50 75 100 125 150 o Ambient Temperature Ta ( C) (V +=42V, V ON/OFF =0V, V SW =0V) ON Output ON Resistance R V+=24V,34V 0 -50 -25 0 25 50 75 100 125 150 o Ambient Temperature Ta ( C) SW Leak Current I LEAKH V+=6V -6- Ver.2011-02-25 NJW4150 TYPICAL CHARACTERISTICS Quiescent Current vs. Temperature (RL= No Load, VIN-=0.5V) (A) Standby Current vs. Temperature (VON/OFF=0V) V+=34V V+=24V 4 (mA) 3 2 50 40 30 20 10 Quiescent Current I V+=34V V+=6V 1 V+=24V Standby Current I DD_STB DD V+=6V 0 -50 -25 0 25 50 75 100 125 150 o Ambient Temperature Ta ( C) 0 -50 -25 0 25 50 75 100 125 150 o Ambient Temperature Ta ( C) 6 Threshold Voltage (V) 5.9 5.8 5.7 5.6 5.5 Under Voltage Lockout Block vs. Temperature V T_ON 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 |
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