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| NJM2384 DC/DC CONVERTER CONTROL IC WITH CURRENT SENSE AMPLIFIER GENERAL DESCRIPTION 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 NJM2384M PACKAGE OUTLINE 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 NJM2384V PIN CONFIGURATION 1 2 3 4 5 6 7 14 13 12 11 10 9 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 2 3 4 5 10 9 8 7 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 14 IN + REF 12 CT 11 CS 10 V + NC 8 13 9 VREF CURRENT SENSE AMP OSC L.O U.V.LO ER*AMP 0.52V PWM 1 NC 2 IN 1 - 3 IN 2 - 4 F.B 5 GND 6 OUT 7 NC (Package: DIP14, DMP14) IN + REF 9 CT 8 CS 7 V + 10 6 VREF CURRENT SENSE AMP OSC L.O U.V.LO 0.52V ER*AMP PWM 1 IN 1 - 2 IN 2 - 3 F.B 4 GND 5 OUT (Package: SSOP10) -2- NJM2384 ABSOLUTE MAXIMUM RATINGS (Ta=25C) 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 TOPR TSTG MAXIMUM RATINGS 36 10 200 2.5 -0.3 2.5 (DIP 14) 700 (DMP 14) 300 (SSOP 10) 250 -40 +85 -50 +150 UNIT V mA mA V V mW C C ELECTRICAL CHARACTERISTICS (V+=6V,RT=33k,CT=1000pF,Ta=25C) 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 + TEST CONDITION IOR=1mA V =3.6 32V, IOR=1mA IOR=0.1 5.0mA MIN. 2.45 - - TYP. 2.50 6.8 5 MAX. 2.55 20.7 30 UNIT V mV mV SYMBOL fOSC fdV fdT + TEST CONDITION RT=33k, CT=1000pF V =3.6 32V Ta=-40C 85C MIN. 85 - - TYP. 105 1 5 MAX. 125 - - UNIT kHz % % 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) VIO1 IIO1 IB1 A V1 GB1 VICM1 VOM-1 IOM+1 TEST CONDITION MIN. - - - - - - TYP. 2 5 5 90 0.6 0 VREF-0.8 - 85 MAX. 7 50 100 - - - 1 200 UNIT mV nA nA dB MHz V V A RNF=100k VOM=0.5V - 40 -3- NJM2384 ELECTRICAL CHARACTERISTICS (V+=6V,RT=33k,CT=1000pF,Ta=25C) 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) VB2 IB2 A V2 GB2 VOM-2 IOM+2 TEST CONDITION MIN. 0.51 - - - - 40 TYP. 0.52 5 90 0.6 - 85 MAX. 0.53 100 - - 1 200 UNIT V nA dB MHz V A RNF=100k VOM=0.5V SYMBOL VTH0 VTH100 TEST CONDITION duty*cycle=0% (note) duty*cycle=100% (note) MIN. - - TYP. 1.65 2.10 MAX. 1.75 - UNIT V V SOFT START CIRCUIT BLOCK PARAMETER SYMBOL Input Bias Current (CS Pin) Input Threshold Voltage (CS Pin) Input Threshold Voltage (CS Pin) IBCS VTHCS0 VTHCS50 TEST CONDITION CS Pin=1.8V duty*cycle=0% (note) duty*cycle=100% (note) MIN. - - - TYP. 250 0.25 0.7 MAX. 650 0.35 - UNIT nA V V UNDER VOLTAGE LOCKOUT BLOCK PARAMETER SYMBOL ON Threshold Voltage OFF Threshold Voltage Hysteresis Voltage OUTPUT BLOCK PARAMETER L Output Voltage (OUT Pin) VTHON VTHOFF VHYS TEST CONDITION MIN. - - 60 TYP. 2.70 2.52 180 MAX. - - - UNIT V V mV SYMBOL VOL TEST CONDITION Output Sink Current=100mA MIN. - TYP. 0.25 MAX. 0.65 UNIT V GENERAL CHARACTERISTICS PARAMETER SYMBOL Latch Mode Threshold Voltage (CS Pin) Quiescent Current Average Quiescent Current VTHLA ICCLA ICCAV TEST CONDITION MIN. 1.2 TYP. 1.5 1.6 5.5 MAX. 1.8 2.2 10 UNIT V mA mA 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 330k 36k 2.50V 10 9 8 7 6 4.7uF 1000pF 180k Vin Vout VREF CURRENT SENSE AMP OSC L.O U.V.LO ER*AMP 0.52V PWM GND 1 2 3 4 5 (Package:SSOP10) -5- NJM2384 TYPICAL CHARACTERISTICS L Output Voltage vs. Source Current (V+=6V,RT=33k,CT=1000pF,Ta=25C) Duty Cycle vs. CS Pin Voltage (V+=6V,Ta=25C) 1 L Output Voltage V OL (V) 0.8 0.6 0.4 0.2 0 0 100 Duty Cycle (%) 80 60 40 20 0 50 100 150 200 Source Current ISOURCE (mA) 250 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 CS Pin Voltage VTHCS (V) 1000 Oscillator Frequency f OSC (kHz) Oscillator Frequency vs. Timing Resistor (V+=6V,Ta=25C) 1000 Oscillator Frequency f OSC (kHz) Oscillator Frequency vs. Timing Capacitor (V+=6V,Ta=25C) 100 CT=470pF 100 RT=10k 10 CT=1000pF 10 RT=33k RT=100k 1 1 10 100 1000 Timing Resistor RT (k) 10000 1 10 100 1000 10000 Timing Capacitor CT (pF) 100000 Reference Voltage VREF (V) 2.52 2.51 2.5 2.49 2.48 Reference Voltage vs. Operating Voltage (V+=6V,Ta=25C) 10 Operating Current ICC (mA) 8 6 4 2 0 Operating Current vs. Operating Voltage (Ta=25C) ICCAV ICCLA 0 10 20 + 30 40 0 10 20 + 30 40 Operating Voltage V (V) Operating Voltage V (V) -6- NJM2384 TYPICAL CHARACTERISTICS Oscillator Frequency vs. Temperature (V+=6V,RT=33k,CT=1000pF) 160 Oscillator Frequency f OSC (kHz) 140 120 100 80 60 3 Reference Voltage VREF (V) 2.8 2.6 2.4 2.2 2 Reference Voltage vs. Temperature (V+=6V,IOR=1mA) -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) 0.5 L Output Voltage VOL (V) 0.4 0.3 0.2 0.1 0 L Output Voltage vs. Temperature (V+=6V,ISINK=100mA,RT=33k,CT=1000pF) 8 Supply Current ICC (mA) 6 4 2 0 Supply Current vs. Temperature (V+=6V,RT=33k,CT=1000pF) ICCAV ICCLA -50 -25 0 25 50 75 100 125 150 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (C) 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- |
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