NJW4122KU1-TE3 Nisshinbo

NJW4122 2A Synchronous Buck Converter for POL FEATURES GENERAL DESCRIPTION Synchronous Rectification The NJW4122 is a synchronous buck converter with Current Mode Control 2A MOSFET. The NJW4122 has wide switching Operating Voltage Range 2.7V to 5.5V oscillating frequency range, 100kHz to 2.4MHz and Switching Current 2.64A min. external clock synchronization function. Therefore it can Adjustable Oscillating Frequency 100kHz to 2.4MHz avoid interference with the AM radio frequency. External Clock Synchronization Internal protection functions: UVLO, an over current PWM Control protection and a thermal shutdown circuit can protect Maximum Duty Cycle 100% at abnormal condition. External Compensation Circuit It is suitable for power supply circuit of SoC, DSP, Correspond to Ceramic Capacitor (MLCC) DDR memory and so on that needs fast transient Soft Start Function 1ms typ. response. UVLO (Under Voltage Lockout) Over Current Protection (Hiccup type) Thermal Shutdown Protection Standby Function Package Outline DFN8-U1 (ESON8-U1) APPLICATION Power supply for SoC, ASIC, DDR and the others TYPICAL APPLICATION V IN C C IN2 IN1 L + V V OUT ON/OFF EN/SYNC SW High: ON Low: OFF(Standby) C OUT NJW4122 C FB R2 PGND R FB RT FB R T GND COMP R1 R C C C Ver.1.0 - 1 - www.njr.com NJW4122 BLOCK DIAGRAM + Enable UVLO V EN/SYNC Control 500k W Logic TSD Enable/Auto Discharge SYNC OSC RT Current Sense Enable Signal Slope HS OCP V =0.6V COMP. B VREF PWM HS S Q Dead time Error AMP Control Driver FB Control R Soft Start SW COMP LS OCP LS Driver Auto Discharge Contol PGND GND Ver.1.0 - 2 - www.njr.com