NJM2309

NJM2309 Switching Regulator Control IC for Step-Down ■GENERAL DESCRIPTION The NJM2309 is a step-down Switching regulator IC with a wide operating voltage range. It features an open collector driver that can provide step-down applications. Internal soft-start function and timer latch function for short circuit protection are included, requiring no external components. ■PACKAGE OUTLINE NJM2309M ( DMP8 ) NJM2309E ( SOP8 ) ■FEATURES ● PWM switching control ● Operating Voltage 3.6V to 32V ● Wide Oscillator Range 5kHz to 500 kHz ● Duty Cycle 0% to 100% ● Soft Start function ● Timer Latch for Short Circuit Protection ● Under Voltage Lockouts (U.V.LO) ● Bipolar Technology ● Package Outline NJM2309M NJM2309E NJM2309V : DMP8 : SOP8 JEDEC 150mil : SSOP8 ■BLOCK DIAGRAM NJM2309V ( SSOP8 ) REF 8 VREF U.V.LO CT 7 30µA OSC CS 6 L.O 0.52V ER⋅AMP PW M S.C.P V+ 5 PIN FUNCTION 1. IN 2. F.B 3. GND 4. OUT 5. V + 6. CS 7. CT 8. REF 1234 IN- F.B GND OUT Ver.2011-12-08 -1- NJM2309 ■ABSOLUTE MAXIMUM RATINGS PARAMETER Input Voltage Out pin Voltage Reference Output Current Output Current SYMBOL V+ VO_PIN IOR IO Power Dissipation PD Operating Temperature Range Storage Temperature Range Topr Tstg (Ta=25°C) MAXIMUM RATINGS UNIT 36 36 10 200 DMP8 : 375 SOP8 : 375 SSOP8 : 312 V V mA mA mW -40 ~ +85 -50 ~ 150 °C °C ■RECOMMENDED OPERATING CONDITIONS PARAMETER Operating Voltage SYMBOL V+ OUT pin Voltage Feed Back Resistor Oscillator Timing Capacitor Oscill...