Overview: DATASHEET ISL8120IR
Dual/n-Phase Buck PWM Controller with Integrated Driver FN6763 Rev.2.00 November 11, 2011 The ISL8120IRZEC integrates two voltage-mode synchronous buck PWM controllers to control a dual independent voltage regulator or a 2-phase single output regulator. It has PLL circuits and can output a phase-shiftprogrammable clock signal for the system to be expanded to 3-, 4-, 6-, 12- phases with desired interleaving phase shift. It also integrates current sharing control for the power module to operate in parallel, which offers high system flexibility.
It has voltage feed forward compensation to maintain a constant loop gain for optimal transient response, especially for applications with a wide input voltage range. Its integrated high speed MOSFET drivers and multi-feature functions provide complete control and protection for a 2/n-phase synchronous buck converter, dual independent regulators, or DDR tracking applications (VDDQ and VTT outputs).
The output voltage of a ISL8120IRZEC-based converter can be precisely regulated to as low as the internal reference voltage 0.6V, with a system accuracy of ±0.9% over industrial temperature and line load variations. Channel 2 can track an external ramp signal for DDR/tracking applications.
The ISL8120IRZEC integrates an internal linear regulator, which generates VCC from input rail for applications with only one single supply rail. The internal oscillator is adjustable from 150kHz to 1.5MHz, and is able to track an external clock signal for frequency synchronization and phase paralleling applications.
