ISL9120 is a new type of buck-boost switching regulator, which can perform efficient power management on system power and peripheral devices such as Wi-Fi, Bluetooth, memory card or LCD module.
The device's adaptive current-limiting PFM architecture provides industry-leading efficiency of up to 98%, while providing a smooth transition from buck to boost to prevent emergence in applications where light-load efficiency and fast transient response are critical glitch. The ultra-small size of the ISL9120 makes it ideal for connected devices that make up the Internet of Things (IoT), including wearables, smartphones, smart thermostats, and point-of-sale devices based on single-cell lithium-ion or lithium-polymer operation. Battery or 2 alkaline, Ni-Cad or Ni-MH batteries.
With the popularity of mobile devices and the increasing popularity of wearable devices, power supply designers face the challenge of balancing cost, form factor, and power efficiency. A typical wearable power solution uses three DC-DC regulators and 3-5 LDOs, which takes up valuable board space. LDOs also lack the high efficiency and reliability of buck-boost regulators, so they also sacrifice performance. For example, when an LDO is used to power peripherals in a system running on a lithium-ion battery with Vout close to 3.3V, large burst currents from the application processor can cause Vin to drop below the LDO regulated voltage, which can cause a memory reset or The application is closed. The ISL9120 buck-boost switching regulator avoids low-voltage glitches by solving a wider Vin range and providing a boost function, thereby avoiding this problem. When Vin drops below the output voltage, low-voltage glitches can cause battery voltage decline. Designers only need a single inductor and use a small package of 1.41mm x 1.41mm, no longer need to sacrifice efficiency or form factor.
The ISL9120 provides designers with the flexibility to meet a variety of design needs by operating over a Vin voltage range of 1.8V to 5.5V and an adjustable output voltage range of 1V to 5.2V. Its adaptive PFM operation with forced bypass mode and 2A switch efficiently supports low load and high load current, ensuring longer battery life and less heat build-up. The regulator also provides 800mA with 2.5V input and 3.3V output. The company said that the ISL9120 enters a forced bypass mode while the system that does not require adjustment remains active, thereby reducing power consumption to a minimum quiescent current of less than 0.5uA.
"Intersil's innovative adaptive PFM architecture meets the most critical low-power design requirements for wearables and other 4G / Wi-Fi-enabled portable products (as IoT connection nodes)," Senior Vice President of Intersil Mobile Power Products Andrew Cowell said. . "The new ISL9120 voltage regulator small size, a smooth transition between the industry-leading efficiency, buck and boost modes and fast load step transient response of large, attractive to customers"
ISL9120 buck - L The step-down regulator is available in 9-ball WLCSP and QFN packages. Designers can use two ISL9120 evaluation boards to evaluate the function and performance of the device: ISL9120IIN-EVZ (3.3Vout) and ISL9120IIA-EVZ (adjustable Vout).
