ISL95870BHRZ

Special Purpose Regulators Overview

The ISL95870BHRZ is a single-phase synchronous-buck PWM regulator IC from Renesas, utilizing proprietary R4 Technology. It features an input voltage range of 3.3V to 25V and an output voltage range of 0.5V to 5V. The device offers precision regulation with ±0.5% system accuracy over temperatures from -10°C to +100°C. It includes selectable PWM frequencies of 300kHz, 500kHz, 600kHz, or 1MHz in continuous conduction mode. The ISL95870B variant supports 2-bit VID inputs for four independent setpoint voltages.

Special Purpose Regulators Feature Summary

• Proprietary R4 modulator technology providing fast transient response and accurate frequency control
• Flexible output voltage programmability via resistor programming or 2-bit VID inputs
• Integrated differential remote sensing for precise output voltage regulation
• Automatic diode emulation mode for optimized light-load efficiency

Special Purpose Regulators Applications

• Portable GPU core-voltage regulators
• Battery-powered systems requiring wide input voltage ranges
• AC-adapter powered applications needing dynamic slew-rate controlled outputs
• Compact power supply designs requiring minimal external components

Special Purpose Regulators Procurement Notes

Verify the specific suffix HRZ against official Renesas documentation to confirm package type (20-QFN) and tape-and-reel quantity. Ensure compatibility with required VID pin configurations for the B-series variant. Cross-reference thermal requirements with PCB layout guidelines provided in the datasheet to maintain operation within the specified -10°C to +100°C range. Confirm that the selected switching frequency aligns with external component specifications for optimal performance.

Special Purpose Regulators Selection Notes

Select the ISL95870B variant when four independent setpoint voltages are required via VID inputs. Choose this component for applications demanding high transient performance and compact design due to integrated drivers and compensation. Consider the wide input voltage range for battery or adapter-based systems. Evaluate the selectable switching frequencies to balance efficiency and component size. Ensure the 20-VFQFN package fits the available PCB space.

Special Purpose Regulators Part Context

The ISL95870 series belongs to Renesas' portfolio of robust ripple regulators designed for high-performance DC/DC conversion. It complements other PMIC solutions by offering single-phase buck regulation with advanced modulation technology. The series targets portable electronics and GPU power management, bridging the gap between simple controllers and complex multi-phase solutions. It integrates essential functions like soft-start and fault detection into a compact form factor.

Special Purpose Regulators FAQ

How does the ISL95870B differ from the ISL95870A regarding VID inputs?

The ISL95870B allows 2-bit VID inputs to select four independent setpoint voltages, whereas the ISL95870A selects four dependent or three independent setpoint voltages.

What is the purpose of the automatic diode emulation mode?

The automatic diode emulation mode enhances efficiency at light loads by mimicking the behavior of a Schottky diode in synchronous rectification applications.