NJM2344

NJM2344 PWM DC/DC Converter IC with Standby Function ■GENERAL DESCRIPTION The NJM2344 is a general purpose PWM DC/DC converter IC configurable for step-up, step-down and inverting applications. An internal 1.5A power transistor, a pulse-by pulse current limit and 1% precision reference make the NJM2344 suitable for a wide range of voltage converter needs. The NJM2344 features a standby function that can be used for both power saving and safety operation. ■PACKAGE OUTLINE NJM2344D NJM2344M ■FEATURES ● Operating Voltage 3.0V to 40V ● Wide Oscillator Frequency 1kHz to 150kHz Precision Reference Voltage Vth=1.25V ± 1% ● Internal High Power Transistor 1.5A max. ● Internal Over Current Limit Circuit ● PWM switching control ● Standby Function 9µA typ. ● Bipolar Technology ● Package Outline NJM2344D : DIP8 NJM2344M : DMP8 ■PIN CONFIGURATION 1 www.DataSheet4U.com 2 3 4 8 7 6 5 ■BLOCK DIAGRAM PIN FUNCTION 1. CS 2. ES 3. CT 4. GND 5. IN6. V+ 7. ON/OFF 8. SI CS 1 Q R PWM Logic 1.5A 160Ω S 8 SI ES 2 7 ON/OFF High :ON Low :OFF (Standby) NJM2344D NJM2344M OSC Block MAX ON Duty 9:1 CT 3 Error AMP Vref 1.25V Ipk Sense 300mV 6 PWM COMP V+ GND 4 Buffer 5 IN- Ver.2009-10-13 -1- NJM2344 ■ABSOLUTE MAXIMUM RATINGS (Ta=25°C) PARAMETER SYMBOL Maximum Supply Voltage V+ Comparator Input Voltage VIR ON/OFF Terminal Voltage VON/OFF Output Driver Voltage VC(driver) Output Switch Voltage VSW Output Driver Current IC(driver) Output Switch Current ISW Power Dissipation Operating Temp...