NJM2340 HIGH PRECISION DC/DC CONVERTER CONTROL IC ■GENERAL DESCRIPTION The NJM2340 is a high precision DC/DC converter control IC with a current sense amplifier. It offers a low side current sensing which offers a DC/DC converter application with a few external parts and minimum error. The NJM2340 has a high input voltage and is available in small surface mount packages, an 8-lead DMP and MSOP (TVSP). Therefore it is well-suited for various applications. ■PACKAGE OUTLINE NJM2340M (DMP8) NJM2340RB1 (MSOP8 (TVSP8)) ■FEATURES ●PWM switching control ●Operating Voltage (3.6 to 32V) ●Wide Oscillator Range (20kHz to 500 kHz) ●Duty Cycle (0% to 100%) ●Current Sensing Amplifier ●High Precision Reference Voltage Voltage Detect: 1V±1.5% Current Detect: 150mV±4% ●Bipolar Technology ●Package Outline DMP8, MSOP8 (TVSP8)* *MEET JEDEC MO-187-DA / THIN TYPE ■PIN CONFIGURATION 1 8 2 7 3 6 4 5 NJM2340M NJM2340RB1 Pin Function 1.IN1 2.IN2 3.F.B 4.GND 5.OUT 6.CT 7.VREF 8.V+ Ver 2.0 - 1 - NJM2340 ■BLOCK DIAGRAM V+ VREF CT 8 7 6 OUT 5 OSC VREF ERROR AMP 1V PWM CURRENT SENSE AMP 0.15V 1 2 3 4 IN1 IN2 F.B GND ■ABSOLUTE MAXIMUM RATINGS (Ta=25°C ) PARAMETER SYMBOL RATINGS + Maximum Supply Voltage V 36 Output Sink Current ISINK 15 Power Dissipation (DMP8) 300 PD (MSOP8(TVSP8)) Operating Temperature Range Topr -40 to +85 Storage Temperature Range Tstg -50 to +150 ■RECOMMENDED OPERATING CONDITIONS PARAMETER Supply Voltage Oscillation Frequency Oscillator Timing Resistance -2- SYMBOL V+ fosc RT UNIT V mA 320 mW °C °C (Ta=25°C) MIN. 3.6 20 20 MAX. 32 500 100 UNIT V kHz kΩ NJM2340 ■ELECTRICAL CHARACTERISTICS (V+=12V,Ta=25°C) REFERENCE VOLTAGE BLOCK PARAMETER SYMBOL TEST CONDITION Output Voltage Line Regulation Load Regulation VREF LINE LOAD OSCILLATOR BLOCK PARAMETER SYMBOL Oscillation Frequency fOSC CURRENT SENSE AMPLIFIER BLOCK PARAMETER SYMBOL Reference Voltage1 Input Bias Voltage1 Maximum Output Voltage1 (F.B Pin) Maximum Source Current1 (F.B Pin) ERROR AMPLIFIER BLOCK PARAMETER Reference Voltage2 Input Bias Voltage2 Maximum Output Voltage2 (F.B Pin) Maximum Source Current2 (F.B Pin) PWM COMPARATE BLOCK PARAMETER Input Threshold Voltage (F.B Pin) Input Threshold Voltage (F.B Pin) OUTPUT BLOCK PARAMETER L Output Voltage (OUT Pin) GENERAL CHARACTERISTICS PARAMETER Average Quiescent Current MIN. TYP. MAX. UNIT V =3.6 ∼ 32V, IOR=1mA IOR=0.1 ∼ 5.0mA 1.98 – – 2.00 4.0 6.0 2.02 20 40 V mV mV TEST CONDITION MIN. TYP. MAX. UNIT 315 350 385 kHz MIN. TYP. MAX. UNIT 156 100 – mV nA V 0.9 200 V µA IOR=1mA + RT=27kΩ, CT=220pF TEST CONDITION VB1 IB1 VOM+1 RNF=100kΩ 144 – – VOM-1 IOM1 RNF=100kΩ VOM1=0.5V 0.6 40 150 20 VREF -0.15 0.75 85 MIN. TYP. MAX. UNIT 1.015 100 – V nA V 0.9 200 V µA SYMBOL TEST CONDITION VB2 IB2 VOM+2 RNF=100kΩ 0.985 – – VOM-2 IOM2 RNF=100kΩ VOM2=0.5V 0.6 40 1.000 20 VREF -0.15 0.75 85 MIN. TYP. MAX. UNIT VOM– 1.0 1.4 1.1 – V V MIN. TYP. MAX. UNIT – 0.5 0.7 V MIN. TYP. MAX. UNIT – 1.5 2.0 mA SYMBOL VTH0 VTH100 SYMBOL VOL SYMBOL ICCAV TEST CONDITION duty·cycle=0% (note) duty·cycle=100% (note) TEST CONDITION ISINK=10mA TEST CONDITION RL=∞, duty·cycle=50% (note) Duty·Cycle is defined as follows: Duty·Cycle=0%: IC output transistor is OFF. Duty·Cycle=100%: IC output transistor is ON. -3- NJM2340 ■TYPICAL APPLICATION VIN L Q1 RT 27kΩ CT 220pF RBE + V 8 VREF 7 VOUT CT VREF OUT 6 RBC 5 OSC ERROR AMP R2 1V PWM CIN D1 COUT CURRENT SENSE AMP 0.15V 1 IN1 2 IN2 CNF2 GNDIN CNF1 3 4 F.B GND R1 RNF2 RNF1 RSC RCIN -4- GNDOUT NJM2340 ■TIPICAL CHARACTERISTICS 1000 CT=100pF CT=220pF 100 Oscillator Frequency f OSC (kHz) Osillator Frequency f OSC (kHz) 1000 Oscillator Frequency vs. Timing Resistor + (V =12V,Ta=25°C) CT=1000pF CT=4700pF Oscillator Frequency vs. Timing Capacitor + (V =12V,Ta=25°C) RT=47kΩ RT=20kΩ 100 RT=100kΩ 10 10 Timing Resistor RT (kΩ) 100 1000 Timing Capacitor CT (pF) Reference Voltage vs. Output Current + (V =12V,Ta=25°C) L Output Voltage vs. Source Current + (V =12V,Ta=25°C) 0.8 L Output Voltage VOL (V) 2.5 10 100 2 1.5 1 0.5 10000 0.6 0.4 0.2 0 0 0 5 10 15 20 25 30 0 3 Output Current IOR (mA) Average Quiescent Current ICC (mA) Reference Voltage VREF (V) 10 6 9 12 15 Source Current ISOURCE (mA) Average Quiescent Current (RL= ∞ ,duty·cycle=50%,Ta=25°C) 3 2.5 2 1.5 1 0.5 0 0 10 20 30 40 + 電源電圧 V (V) -5- NJM2340 ■TIPICAL CHARACTERISTICS Oscillation Frequency vs. Temperature + (V =12V,RT=27kΩ,CT=220pF) Input Threshold Voltage (V) 380 360 340 320 300 VTH100 1.6 1.2 0.8 VTH0 0.4 0 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (°C) -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (°C) L Level Output Voltage vs. Temperaure + (V =12V,ISINK=10mA) Average Quisent Current vs. Temperature + (V =12V,RL= ∞ ,duty·cycle=50%) 3 Average Quisent Current ICCAV (mA) 0.5 L Output Voltage VOL (V) 2 0.4 0.3 0.2 0.1 2.5 2 1.5 1 0.5 0 0 -50 -25 0 25 50 75 100 125 150 -50 -25 Ambient Temperature Ta (°C) Reference Voltage1 VB1 (mV) 153 -6- 152 25 50 75 100 125 150 Ambient Temperature Ta (°C) Reference Voltage 1,2 vs. Temperaure + (V =12V) VB 1 1.03 1.02 151 1.01 150 1 149 0 VB 2 0.99 148 0.98 147 0.97 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (°C) Reference Voltage2 VB2 (V) Oscillation Frequency f OSC (kHz) 400 Input Threshold Voltage vs. Temperature + (V =12V) [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.