ON Semiconductor

The NCP1571 is a low voltage buck controller. It provides the control for a DC/DC power solution producing an output voltage as low as 0.980 V over a wide current range. The NCP1571-based solution is powered from 12 V with the output derived from a 2-7 V supply. It contains all required circuitry for a synchronous NFET buck regulator using the V2 control method to achieve the fastest possible transient response and best overall regulation. NCP1571 operates at a fixed internal 200 kHz frequency and is packaged in an SO-8. This device provides undervoltage lockout protection, Soft Start, Power Good with delay, and built-in adaptive non-overlap. During undervoltage lockout, the NCP1571 controller allows the power supply output to drift down, allowing the load time to shut off. This operation distinguishes the NCP1571 from other parts in its family.

The NCP1575 is a low voltage buck controller. It provides the control for dc-dc power solution producing an output voltage as low as 0.980V over a wide current range. It contains all required circuitry for a synchronous NFET buck regulator using the V2TM control method to achieve the fastest possible transient response and best overall regulation. The NCP1575 operates at a default switching frequency of 200kHz, but switching frequency is user-programmable with an additional resistor between Rosc and ground. This device provides undervoltage lockout protection, Soft Start, and built-in adaptive nonoverlap and is assemble in an SO-8 package.

The NCP1580 is a voltage mode PWM controller designed to operate from a 5.0V or 12V supply and produce an output voltage as low as 0.8V. This 8-pin device provides an optimal level of integration to reduce size and cost of the power supply. The NCP1580 has a fixed 350 kHz oscillator and soft-start function. The NCP1580 provides a 1.5A floating gate driver design to drive N-Channel MOSFETs in a synchronous configuration. Adaptive non-overlap circuitry reduces switching losses by preventing simultaneous conduction of both outputs. Protection features include thermal shutdown and undervoltage lockout (UVLO). The NCP1580 is available in a 8-pin SOIC package.

Low Voltage Synchronous Buck Controller

Te NCP1589A or NCP1589B is a low cost PWM controller designed to operate from a 5V or 12V supply. This device is capable of producing an output voltage as low as 0.8V. This device is capable of converting voltage from as low as 2.5V. This 10 pin device provides an optimal level of integration to reduce size and cost of the power supply.

The NCP1593 is a fixed 1 MHz, high output current, synchronous PWM converter that integrates a low-resistance, high-side P-channel MOSFET and a low-side N-channel MOSFET. The NCP1593 utilizes internally compensated current mode control to provide good transient response, ease of implementation and excellent loop stability. It regulates input voltages from 4.0 V to 5.5 V down to an output voltage as low as 0.6 V and is able to supply up to 3 A of load current. The NCP1593 includes an internally fixed switching frequency (FSW), and an internal soft-start to limit inrush current. Other features include cycle-by-cycle current limiting, 100% duty cycle operation, short- circuit protection, power saving mode and thermal shutdown.