ISL95870BIRZ-T

The ISL95870, ISL95870A, and ISL95870B ICs are Single-Phase Synchronous-Buck PWM regulators that feature Intersil’s proprietary R4 Technology™, offering a wide input voltage range of 3.3V to 25V, making them ideal for systems running on battery or AC-adapter power sources . The R4 modulator used in these controllers offers equivalent light-load efficiency and faster transient response compared to the R3 modulator . In conclusion, the high performance and compact design of the ISL95870, ISL95870A, and ISL95870B controllers can be attributed to their wide input voltage range, dynamically selected slew-rate controlled output voltages, and efficient R4 modulator technology, along with features like soft-start and voltage identification logic-inputs .

The input voltage range for the ISL95870, ISL95870A, and ISL95870B PWM DC/DC controllers is from 3.3V to 25V, making them ideal for systems that run on battery or AC-adapter power sources.

The output voltage of the converter for the ISL95870 and ISL95870A controllers is set using resistor-programmed setpoint reference voltages that directly configure the output voltage of the converter between 0.5V and 1.5V, and up to 5V with a feedback voltage divider. The voltage identification logic-inputs select four resistor-programmed setpoint reference voltages, V SET1, V SET2, V SET3, and V SET4, where V SET1 is fixed at 0.5V. These setpoint reference voltages are designed in a way that V SET1 < V SET2 < V SET3 < V SET4, and the sum of all the programming resistors should be approximately 300kΩ. The programmed resistors R SET1, R SET2, R SET3, and R SET4 are calculated based on initial values and equations provided in the documentation .