ISL6269

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The ISL6269 IC is a Single-Phase Synchronous-Buck PWM controller featuring Intersil's Robust Ripple Regulator (R³) technology that delivers truly superior dynamic response to input voltage and output load transients. Integrated MOSFET drivers, 5V LDO and bootstrap diode result in fewer components and smaller implementation area. Intersil's R³ technology combines the best features of fixed-frequency PWM and hysteretic PWM while eliminating many of their shortcomings. R³ technology employs an innovative modulator that synthesizes an AC ripple voltage signal V_R, analogous to the output inductor ripple current. The AC signal V_R enters a window comparator where the lower threshold is the error amplifier output V_COMP, and the upper threshold is a programmable voltage reference V_W, resulting in generation of the PWM signal. The voltage reference V_W sets the steady state PWM frequency. Both edges of the PWM can be modulated in response to input voltage transients and output load transients, much faster than conventional fixed frequency PWM controllers. Unlike a conventional hysteretic converter, the ISL6269 has an error amplifier that provides ±1% voltage regulation at the FB pin. The ISL6269 has a 1. 5ms digital soft-start and can be started into a pre-biased output voltage. A resistor divider is used to program the output voltage setpoint. The ISL6269 can be configured to operate in continuous-conduction-mode (CCM) or diode-emulation-mode (DEM), which improves light-load efficiency. In CCM the controller always operates as a synchronous rectifier however, when DEM is enabled the low-side MOSFET is permitted to stay off, blocking negative current flow into the low-side MOSFET from the output inductor.