NJM2360A HIGH PRECISION DC/DC CONVERTER CONTROL IC GENERAL DESCRIPTION PACKAGE OUTLINE The NJM2360A is a control circuit containing the primary functions required for DC to DC CONVERTOR. This device consist of high precision reference, comparator controlled duty cycle oscillator with an active current limit circuit, driver and high current output switch. This IC was specifically designed to be incorporated in step-up, NJM2360AD NJM2360AM step-down and inverting applications with a minimum number of external components. This IC is designed to be 5% output voltage by using precision 1% resistance on external detected resistance. FEATURES Precision Reference 1.25V2% Output Switch Current 1.5A (MAX) Operating Voltage 2.5V* to 40V Internal Over Current Limit Circuit + Supply Voltage V 2.5V* to 40V Output Voltage V 1.25V to 40V OR Oscillator Frequency f 100Hz to 100kHz OSC Package Outline DIP8, DMP8 *Ta =25C. At low temperature, the minimum voltage is 3.0V. PIN CONFIGURATION NJM2360AD NJM2360AM BLOCK DIAGRAM Ver.2007-06-08 - 1 - NJM2360A ABSOLUTE MAXIMUM RATINGS (T = 25C) a PARAMETER SYMBOL RATINGS UNIT + Supply Voltage V 40 V Comparator Input Voltage Range V -0.3 to 40 V IR (DIP8) 875 mW Power Dissipation P D (DMP8) 750 (note1) mW Switch Current I 1.5 A SW Operating Temperature Range T -40 to + 85 C opr Storage Temperature Range T -40 to +150 C stg (note 1) At on PC board ELECTRICAL CHARACTERISTICS + DC Characteristics (V = 5V, T = 25C) a PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX.UNIT + 5V V 40V, CT = 0.001F Operating Current I + - 2.4 3.5 mA CC S = V , INV > V , E = GND 1 IN th S Oscillator + Charge Current I 5V V 40V 20 35 50 A chg + Discharge Current I 5V V 40V 150 200 250 A dischg Voltage Swing V - 0.5 - V OSC P-P + Discharge to Charge Current Ratio I /I S = V - 6 - - dischg chg I Peak Current Sense Voltage V I =I 250 300 350 mV IPK(sense) chg dischg Output Switch (Note 2) Darlington Connection (C = C ) S D Saturation Voltage 1 V 1 - 1.0 1.3 V CE(sat) I = 1.0A SW I = 1.0A, I (driver) = 50mA SW C Saturation Voltage 2 V 2 - 0.5 0.7 V CE(sat) (Forced =20) DC Current Gain h I = 1.0A, V = 5.0V 35 120 - - FE SW CE Collector Off-State Current I V = 40V - 10 - nA C(off) CE Comparator Threshold Voltage V 1.225 1.250 1.275 V th Input Bias Current I V = OV - 40 400 nA IB IN Note 2 : Output switch tests are performed under pulsed conditions to minimize power dissipation. 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. Ver.2007-06-08 - 2 -