NJW1933-T 600mA, 500kHz, Step-Down Switching Regulator in SOT-23 GENERAL DESCRIPTION PACKAGE OUTLINE The NJW1933 is a switching regulator IC for buck converter that operates wide input voltage range from 4.5V to 40V. The wide input range makes the NJW1933 suitable for several applications such as 12V and/or 24V industrial supplies, automotive batteries and the other unregulated voltage sources. It corresponds to Low ESR output capacitor (MLCC), high operating frequency of 500kHz, internally compensated and small NJW1933F1 SOT-23 package. Therefore, the NJW1933 can realize downsizing of applications with a few and tiny external parts so that adopts current mode control. Also, it has a soft start function, over current protection and thermal shutdown circuit. FEATURES Pin compatible with LT1933 and LT2842. Also it is possible to reduce an external part Maximum Rating Input Voltage: 45V Wide Operating Voltage Range: 4.5 V to 40V Switching Current: 0.8A (min.) Fixed Operating Frequency: 500kHz (A-version) Uses Tiny Capacitors and Inductors Soft Start Function Low Shutdown Current 1 A Internally Compensated Under Voltage Lockout (UVLO) Output Adjustable Down to 1.25V Over Current Protection / Thermal Shutdown Protection Package Outline: SOT-23-6-1 PIN CONFIGURATION N.C. 1 6 SW GND 2 5 VIN FB 3 4 SHDN NJW1933F1 Ver.2016-02-22 - 1 - NJW1933-T PIN DESCRIPTIONS PIN PIN NAME FUNCTION NUMBER N.C. 1 Unused pin GND 2 GND pin Output Voltage Detecting pin FB 3 Connects output voltage through the resistor divider tap to this pin in order to voltage of the FB pin become 1.245V. Standby Control pin SHDN 4 Normal Operation at the time of High Level. Standby Mode at the time of Low Level or Open. VIN 5 Power Supply pin for Power Line SW 6 Switch Output pin of Power MOSFET BLOCK DIAGRAM VIN CURRENT SENSE UVLO OSC OCP SHDN Buffer S Q Soft R Start TSD FB SW Error PWM AMP Vref 1.245V GND Ver.2016-02-22 - 2 -