NJM2384 DC/DC CONVERTER CONTROL IC WITH CURRENT SENSE AMPLIFIER ■GENERAL DESCRIPTION ■PACKAGE OUTLINE The NJM2384 is a low voltage operation DC/DC converter control IC featuring high side current protection and soft start functions. It is suitable for battery charger, power module application and on-board regulators. NJM2384D ■FEATURES ● PWM switching control ● Operating Voltage 3.6V to 32V ● Wide Oscillator Range 5kHz to 500 kHz ● Current Sensing Amplifier ● Soft-Start Function ● UVLO (Under Voltage Lockouts) ● Bipolar Technology ● Package Outline DIP14, DMP14, SSOP10 NJM2384M NJM2384V ■PIN CONFIGURATION 1 14 2 13 3 12 4 11 5 10 6 9 7 8 PIN FUNCTION 8.NC 1.NC 9. V+ 2.IN-1 3.IN-2 10.CS 11.CT 4.F.B 12.REF 5.GND 13.IN+ 6.OUT 7.NC 14.NC NJM2384D NJM2384M 1 10 2 9 3 8 4 7 5 6 NJM2384V PIN FUNCTION 6. V+ 1.IN-1 2.IN-2 7.CS 8.CT 3.F.B 9.REF 4.GND 10.IN+ 5.OUT Ver 1.1 - 1 - NJM2384 ■BLOCK DIAGRAM + NC IN REF CT 14 13 12 11 VREF CURRENT SENSE AMP + NC 9 8 6 7 V CS 10 OSC L.O U.V.LO ER·AMP 0.52V 1 NC PWM 2 3 - 4 - IN 1 IN 2 5 F.B GND OUT NC (Package: DIP14, DMP14) + IN REF 10 CT 9 8 VREF CURRENT SENSE AMP 0.52V V 7 + 6 OSC L.O U.V.LO ER·AMP PWM 1 2 - IN 2 IN 1 CS - 3 F.B 4 GND 5 OUT (Package: SSOP10) -2- NJM2384 ■ABSOLUTE MAXIMUM RATINGS (Ta=25°C) PARAMETER SYMBOL Input Voltage V+ Reference Output Current IOR Output Sink Current ISINK Differential Input Voltage VID Common Mode Input Voltage VIC Power Dissipation PD Operating Temperature Range Storage Temperature Range MAXIMUM RATINGS 36 10 200 2.5 -0.3 ∼ 2.5 (DIP 14) 700 (DMP 14) 300 (SSOP 10) 250 -40 ∼ +85 -50 ∼ +150 TOPR TSTG UNIT V mA mA V V mW °C °C ■ELECTRICAL CHARACTERISTICS (V+=6V,RT=33kΩ,CT=1000pF,Ta=25°C) REFERENCE VOLTAGE BLOCK PARAMETER SYMBOL Output Voltage Line Regulation Load Regulation OSCILLATOR BLOCK PARAMETER Oscillation Frequency Oscillate Fluctuations1 (Line Fluctuations) Oscillate Fluctuations2 (Temp Fluctuations) VREF LINE LOAD MIN. TYP. MAX. UNIT 2.45 – – 2.50 6.8 5 2.55 20.7 30 V mV mV MIN. TYP. MAX. UNIT V =3.6 ∼ 32V 85 – 105 1 125 – kHz % Ta=-40°C ∼ 85°C – 5 – % MIN. TYP. MAX. UNIT – – – – – – 7 50 100 – – – mV nA nA dB MHz V 1 V 200 µA IOR=1mA + V =3.6 ∼ 32V, IOR=1mA IOR=0.1 ∼ 5.0mA SYMBOL fOSC fdV fdT CURRENT SENSE AMPLIFIER BLOCK PARAMETER SYMBOL Input Offset Voltage1 Input Offset Current1 Input Bias Current1 Open Loop Gain1 Gain Bandwidth Product1 Input Common Mode Voltage Ratio1 Maximum Output Voltage1 (F.B Pin) Maximum Source Current1 (F.B Pin) TEST CONDITION TEST CONDITION RT=33kΩ, CT=1000pF + TEST CONDITION VIO1 IIO1 IB1 A V1 GB1 VICM1 VOM-1 RNF=100kΩ – 2 5 5 90 0.6 0∼ VREF-0.8 – IOM+1 VOM=0.5V 40 85 -3- NJM2384 ■ELECTRICAL CHARACTERISTICS (V+=6V,RT=33kΩ,CT=1000pF,Ta=25°C) ERROR AMPLIFIER BLOCK PARAMETER SYMBOL Reference Voltage2 Input Bias Voltage2 Open Loop Gain2 Gain Bandwidth Product2 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) MIN. TYP. MAX. UNIT 0.51 – – – – 0.52 5 90 0.6 – 0.53 100 – – 1 V nA dB MHz V 40 85 200 µA MIN. TYP. MAX. UNIT duty·cycle=0% (note) – 1.65 1.75 V duty·cycle=100% (note) – 2.10 – V MIN. TYP. MAX. UNIT CS Pin=1.8V – 250 650 nA VTHCS0 duty·cycle=0% (note) – 0.25 0.35 V VTHCS50 duty·cycle=100% (note) – 0.7 – V MIN. TYP. MAX. UNIT – – 60 2.70 2.52 180 – – – V V mV MIN. TYP. MAX. UNIT – 0.25 0.65 V MIN. TYP. MAX. UNIT 1.2 1.5 1.8 V – – 1.6 5.5 2.2 10 mA mA VB2 IB2 A V2 GB2 VOM-2 RNF=100kΩ IOM+2 VOM=0.5V SYMBOL VTH0 VTH100 SOFT START CIRCUIT BLOCK PARAMETER SYMBOL Input Bias Current (CS Pin) Input Threshold Voltage (CS Pin) Input Threshold Voltage (CS Pin) IBCS UNDER VOLTAGE LOCKOUT BLOCK PARAMETER SYMBOL ON Threshold Voltage OFF Threshold Voltage Hysteresis Voltage OUTPUT BLOCK PARAMETER L Output Voltage (OUT Pin) TEST CONDITION TEST CONDITION TEST CONDITION VTHON VTHOFF VHYS SYMBOL VOL GENERAL CHARACTERISTICS PARAMETER SYMBOL Latch Mode Threshold Voltage (CS Pin) Quiescent Current Average Quiescent Current TEST CONDITION TEST CONDITION Output Sink Current=100mA TEST CONDITION VTHLA ICCLA ICCAV Latch Mode 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. -4- NJM2384 ■ TYPICAL APPLICATIONS 330kΩ 4.7uF 180kΩ Vin 36kΩ 1000pF 2.50V 10 9 8 VREF CURRENT SENSE AMP 7 6 Vout OSC L.O U.V.LO ER·AMP 0.52V 1 PWM 2 3 GND 4 5 (Package:SSOP10) -5- NJM2384 ■TYPICAL CHARACTERISTICS L Output Voltage vs. Source Current (V+=6V,RT=33kΩ,CT=1000pF,Ta=25°C) 100 0.8 80 Duty Cycle α (%) L Output Voltage V OL (V) 1 0.6 0.4 0.2 60 40 20 0 0 0 250 1000 1 RT=10kΩ RT=33kΩ 10 RT=100kΩ 1 1 2.52 10 100 1000 Timing Resistor RT (kΩ) 10000 10 Reference Voltage vs. Operating Voltage (V+=6V,Ta=25°C) 10 Operating Current ICC (mA) Reference Voltage VREF (V) Oscillator Frequency vs. Timing Capacitor (V+=6V,Ta=25°C) 100 CT=1000pF 10 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 CS Pin Voltage VTHCS (V) CT=470pF 100 0 Oscillator Frequency f OSC (kHz) Oscillator Frequency f OSC (kHz) 50 100 150 200 Source Current ISOURCE (mA) Oscillator Frequency vs. Timing Resistor (V+=6V,Ta=25°C) 1000 2.51 2.5 2.49 2.48 0 10 20 30 + Operating Voltage V (V) -6- Duty Cycle vs. CS Pin Voltage (V+=6V,Ta=25°C) 40 100 1000 10000 Timing Capacitor CT (pF) 100000 Operating Current vs. Operating Voltage (Ta=25°C) 8 6 ICCAV 4 ICCLA 2 0 0 10 20 30 + Operating Voltage V (V) 40 NJM2384 ■TYPICAL CHARACTERISTICS Oscillator Frequency vs. Temperature (V+=6V,RT=33kΩ,CT=1000pF) 140 3 Reference Voltage VREF (V) Oscillator Frequency f OSC (kHz) 160 120 100 80 2.8 2.6 2.4 2.2 2 60 -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 Output Voltage vs. Temperature (V+=6V,ISINK=100mA,RT=33kΩ,CT=1000pF) Supply Current vs. Temperature (V+=6V,RT=33kΩ,CT=1000pF) 8 Supply Current ICC (mA) 0.5 L Output Voltage VOL (V) Reference Voltage vs. Temperature (V+=6V,IOR=1mA) 0.4 0.3 0.2 0.1 6 ICCAV 4 ICCLA 2 0 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) [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. -7-