The ISL8117A is a synchronous buck controller to generate

POL voltage rails and bias voltage rails for a wide variety of

applications in industrial and general purpose segments. Its

wide input and output voltage ranges make it suitable for

telecommunication and after-market automotive applications.

ISL8117A is a derivative from the ISL8117 by replacing its

CLKOUT pin with COMP pin to provide flexibility to customers to

configure the voltage loop compensation externally.

The ISL8117A uses the valley current modulation technique to

bring a hassle-free power supply design with minimal number

of components and complete protection from unwanted

events.

The ISL8117A offers programmable soft-start and enable

functions along with a power-good indicator for ease of supply

rail sequencing and other housekeeping requirements. In ideal

situations, a complete power supply circuit can be designed

with 10 external components and provide OV/OC/OT

protections in a space conscious 16 Ld 4mmx4mm QFN

package. The package uses an EPAD to improve thermal

dissipation and noise immunity. Low pin count, less number of

external components and default internal values, makes the

ISL8117A an ideal solution for quick to market simple power

supply designs. The ISL8117A utilizes single resistor settings

for other functions such as operating frequency and

overcurrent protection. Its current mode control with VIN

feed-forward enables it to cover various applications. The

unique DEM/Skipping mode at light load dramatically lowers

standby power consumption with consistent output ripple over

different load levels.

特性 Features

? Wide input voltage range: 4.5V to 60V

? Wide output voltage range: 0.6V to 54V

? Light-load efficiency enhancement

- Low ripple diode emulation mode with pulse skipping

? Programmable soft-start

? Supports prebiased output with SR soft-start

? Programmable frequency: 100kHz to 2MHz

? External sync

? PGOOD indicator

? Forced PWM

? Adaptive shoot-through protection

? No external current sense resistor

- Use lower MOSFET rDS(ON)

? Functional pins with default design values

- EN, RT, SS/TRK, MOD/SYNC, LGATE/OCS

? Complete protection

- Overcurrent, overvoltage, over-temperature, undervoltage

? Pb-free (RoHS compliant)

Applications

? PLC and factory automation

? Industrial equipments

? Security surveillance

? Server and data centers

? Switcher and routers

? Telecom and datacom

? LED panels