ON Semiconductor Corp. (Phoenix, AZ) introduced the NCP1501, the second device in a series of dual-mode, pulse-width modulation (PWM) buck converters that feature a low drop-out (LDO) mode. The new device is suitable for the power management of portable applications, including cellular phones, PDAs, digital cameras and supplies for digital signal processor cores.
The converter has four, digitally selectable, fixed-output voltages (1.05V, 1.35V, 1.57V and 1.8V). The NCP1501 will supply up to 300mA to the load and, in PWM mode, the NCP1501 accepts a synchronization clock signal between 500kHz and 1,000kHz. Built-in synchronous rectification provides high efficiency (up to 92.5%) for medium to high loads.
The NCP1501 provides an input-voltage range of 2.7V to 5.2V, and is able to operate directly from a one-cell, lithium-ion battery, or a three-cell, nickel-metal hydride battery. Additionally, the device features a shutdown pin and digitally programmable voltage selection that enables designers to set the output voltage to 1.05V, 1.35V, 1.57V or 1.8V. The 1.05V option ensures that the NCP1501 is properly configured for the core voltage needs of next-generation designs. During shutdown, quiescent current is 0.2uA, which significantly conserves battery life.
The NCP1501 is offered in a space-saving, 3mm x 5mm, Micro-8 package. It is priced at $1.10 per unit in 4,000-unit quantities.
