NJM2393

NJM2393 Step-Down PWM DC/DC Converter IC ■GENERAL DESCRIPTION The NJM2393 is a step down PWM DC/DC converter IC. An internal 1.5A power transistor, a pulse-by-pulse current limit circuit and a 1% precision reference make the NJM2393 suitable for a wide range of step down applications. The NJM2393 features 100% maximum duty cycle for low voltage drop operation. ■PACKAGE OUTLINE NJM2393D NJM2393M ■FEATURES Operating Voltage Wide Oscillator Frequency Precision Reference Voltage Internal High Power Transistor Maximum duty ratio Internal Over Current Limit Circuit PWM switching control Bipolar Technology Package Outline NJM2393D NJM2393M ■PIN CONFIGURATION 1 www.DataSheet4U.com 3.0V~40V 1kHz~150kHz Vth=1.25V ± 1% 1.5A max. 100% : DIP8 : DMP8 ■BLOCK DIAGRAM 8 7 6 5 2 3 4 NJM2393D NJM2393M PIN FUNCTION 1. CS 2. ES 3. CT 4. GND 5. IN6. V+ 7. SI 8. CD CS 1 R Q PWM Logic S 160Ω 8 CD 1.5A ES 2 7 SI OSC Block MAX Duty =100% Ipk Sense 300mV 6 Error AMP PWM COMP V+ CT 3 Vref 1.25V GND 4 Buffer 5 IN- Ver.2009-09-28 -1- NJM2393 ■ABSOLUTE MAXIMUM RATINGS (Ta=25°C) PARAMETER SYMBOL Maximum Supply Voltage V+ Comparator Input Voltage VIR Output Driver Voltage VC(driver) Output Switch Voltage VSW Output Driver Current IC(driver) Output Switch Current ISW Power Dissipation Operating Temperature Range Storage Temperature Range PD Topr Tstg MAXIMUM RATINGS 40 -0.3 ~ 40 (note) 40 40 100 1.5 DIP8 875 DMP8 580 (*1) 750 (*2) -40 ~ +85 -50 ~ +150 UNIT V V V V mA A m...