BCD Process Series U . D . NJW4140 Switching Regulator IC for Boost Converter FEATURES PACKAGE OUTLINE z Operating Voltage Range 3V to 35V z Drive Nch MOSFET (Ciss=3,000pF, Gate voltage 5V max.) z Oscillation Frequency 50kHz to 1MHz z PWM Control z External Synchronous Function z Over Current Protection z Built-in OSC Enable Function z Package Outline DMP8, VSP8 NJW4140M (DMP8) NJW4140R (VSP8) 2.9×4.0×1.2mm + BLOCK DIAGRAM V 5V Reg. ON/OFF Enable Control EN OSC Enable Driver OUT OSC PWM Comparator Vref 1V SI Error AMP IN- VIPK FB CT GND Please note that this device is still under the development and therefore the specifications are subject to change. Ver.2010/09/03 1 NJW4140 Typical Application L miniaturization is possible by the acceleration of oscillation frequency MLCC is corresponding CNF RNF VIN CIN CNF RNF VIN CIN ON/OFF 4 3 2 1 FB IN- EN V+ ch.1 L1 VOUT SBD1 COUT CFB EN="H": ON EN="L": OFF CT 5 GND SI 6 7 Power MOS1 OUT 8 RSENSE1 RFB R2 L SBD 4 3 2 1 FB IN- EN V R1 Power MOS FET NJW4140 CT REN SW 4 3 2 1 FB IN- EN V+ CT GND SI VOFF_OSC≤V EN≤V ON synchronized operation mode 5 6 7 OUT 8 ch.2 L2 SBD2 Power MOS2 VOUT COUT + CT GND SI OUT 5 6 7 8 CFB RFB R2 RSENSE R1 CT RSENSE2 Multiple uses are possible by synchronous operation. NJW4140 can realize nonisolated/isolated circuit Please note that this device is still under the development and therefore the specifications are subject to change. Ver.2010/09/03 2