The ISL95870, ISL95870A, ISL95870B ICs are Single-Phase Synchronous-Buck PWM regulators featuring Intersil’s proprietary R4 Technology™. The wide 3. 3V to 25V input voltage range is ideal for systems that run on battery or AC-adapter power sources. The ISL95870A and ISL95870B are low-cost solutions for applications requiring dynamically selected slew-rate controlled output voltages. The soft-start and dynamic setpoint slew-rates are capacitor programmed. Voltage identification logic-inputs select four (ISL95870A, ISL95870B) resistor-programmed setpoint reference voltages that directly set the output voltage of the converter between 0. 5V and 1. 5V, and up to 5V with a feedback voltage divider. Compared with R3 modulator, the R4 modulator has equivalent light-load efficiency, faster transient performance, accurately regulated frequency control and all internal compensation. These updates, together with integrated MOSFET drivers and schottky bootstrap diode, allow for a high-performance regulator that is highly compact and needs few external components. The differential remote sensing for output voltage and selectable switching frequency are another two new functions. For maximum efficiency, the converter automatically enters diode-emulation mode (DEM) during light-load conditions such as system standby.

Features

  • Input Voltage Range: 3.3V to 25V
  • Output Voltage Range: 0.5V to 5V
  • Precision Regulation
  • Proprietary R4™ Frequency Control Loop
  • ±0.5% System Accuracy Over -10°C to +100°C
  • Optimal Transient Response
  • Intersil's R4™ Modulator Technology
  • Output Remote Sense
  • Extremely Flexible Output Voltage Programmability
  • 2-Bit VID Selects Four Independent Setpoint Voltages for ISL95870B
  • 2-Bit VID Selects Four Dependent or Three Independent Setpoint Voltages for ISL95870A
  • Simple Resistor Programming of Setpoint Voltages
  • Selectable 300kHz, 500kHz, 600kHz or 1MHz PWM Frequency in Continuous Conduction
  • Automatic Diode Emulation Mode for Highest Efficiency
  • Power-Good Monitor for Soft-Start and Fault Detection

Applications

  • Mobile PC Graphical Processing Unit VCC Rail
  • Mobile PC I/O Controller Hub (ICH) VCC Rail
  • Mobile PC Memory Controller Hub (GMCH) VCC Rail

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active uTQFN Reel 3000
Availability
Active uTQFN Reel 3000
Availability

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
ISL95870, ISL95870A, ISL95870B Datasheet 日本語 Datasheet PDF 1.41 MB
Application Notes & White Papers
Five Easy Steps to Create a Multi-Load Power Solution White Paper PDF 846 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
PCNs & PDNs
PCN14036 - Wafer fabrication Site Change for Listed Intersil Products - Palm Bay, Florida Product Change Notice PDF 294 KB
Other
ISL95870A iSim:PE Model Schematic SXSCH 246 KB