NCP1546

NCP1546 1.5 A, 170 kHz, Buck Regulator with Synchronization Capability The NCP1546 is a 1.5 A buck regulator IC operating at a fixed−frequency of 170 kHz. The device uses the V2t control architecture to provide unmatched transient response, the best overall regulation and the simplest loop compensation for today’s high−speed logic. The NCP1546 accommodates input voltages from 4.0 V to 40 V and contains synchronization circuitry. The on−chip NPN transistor is capable of providing a minimum of 1.5 A of output current, and is biased by an external “boost” capacitor to ensure saturation, thus minimizing on−chip power dissipation. Protection circuitry includes thermal shutdown, cycle−by−cycle current limiting and frequency foldback. Features V2 Architecture Provides Ultra−Fast Transient Response, Improved Regulation and Simplified Design Wide Operating Range: 4 V to 40 V 2.0% Error Amp Reference Voltage Tolerance Switch Frequency Decrease of 4:1 in Short Circuit Conditions Reduces Short Circuit Power Dissipation BOOST Lead Allows “Bootstrapped” Operation to Maximize Efficiency Sync Function for Parallel Supply Operation or Noise Minimization Shutdown Lead Provides Power−Down Option 1.0 mA Quiescent Current During Power−Down Thermal Shutdown Soft−Start These are Pb−Free Devices http://onsemi.com MARKING DIAGRAM 1 18 18 1 NCP1546 AWLYYWW G G 18−LEAD DFN MN SUFFIX CASE 505 8 1 SOIC−8 D SUFFIX CASE 751 8 P1546 ALYWE G 1 A = Assembly Location WL, L = Wa...