The ISL8120 integrates two voltage-mode PWM leading-edge modulation control, with input feed-forward synchronous buck PWM controllers, to control a dual independent voltage regulator or a 2-phase single output regulator. It also integrates current sharing control for the power module to operate in parallel, which offers high system flexibility. The ISL8120 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 synchronize to an external clock signal for frequency synchronization and phase paralleling applications. Its PLL circuit can output a phase-shift programmable clock signal for the system to be expanded to 3-, 4-, 6-, 12- phases with desired interleaving phase shift. The ISL8120’s Fault Hand Shake feature protects any channel from overloading/stressing due to system faults or phase failure. The undervoltage fault protection features are also designed to prevent a negative transient on the output voltage during falling down. This eliminates the Schottky diode that is used in some systems for protecting the load device from reversed output voltage damage.
Features
- Wide VIN range operation: 3V to 22V
- VCC operation from 3V to 5.60V
- Excellent output voltage regulation: 0.6V ±0.6%/±0.9% internal reference over commercial/industrial temperature
- Frequency synchronization
- Programmable phase shift for 1-, 2-, 3-, 4-, 6-, up to 12-phase applications
- Fault hand shake capability for high system reliability
- Digital soft-start with precharged output start-up capability
- Dual independent channel enable inputs with precision voltage monitor and voltage feed-forward capability
- Programmable input voltage POR and its hysteresis with a resistor divider at EN input
- Extensive circuit protection functions: output overvoltage, undervoltage, overcurrent protection, over temperature and pre-power-on reset overvoltage protection option
Applications
- Power Supply for Datacom/Telecom and POL
- Paralleling Power Module
- Wide and Narrow Input Voltage Range Buck Regulators
- DDR I and II Applications
- High Current Density Power Supplies
- Multiple Outputs VRM and VRD