ISL95870B PWM DC/DC Controller with VID Inputs for Portable GPU Core-Voltage Regulator

VIN (min) (V)	5
VIN (max) (V)	25
VOUT (min) (V)	0.5
VOUT (max) (V)	5
IOUT (max) (A)	30
VBIAS (V)	5

The ISL95870, ISL95870A, ISL95870B ICs are Single-Phase Synchronous-Buck PWM regulators featuring Intersils proprietary R4 TechnologyTM. 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.

ISL95870B 特点

Input Voltage Range: 3.3V to 25V
Output Voltage Range: 0.5V to 5V
Precision Regulation
- Proprietary R4TM Frequency Control Loop
- ±0.5% System Accuracy Over -10C to +100C
Optimal Transient Response
- Intersils R4TM 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

ISL95870B 应用

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

ISL95870B 芯片订购指南

芯片型号	产品状态	温度范围	封装尺寸图	潮湿敏感度等级MSL	美元价格US $
ISL95870BHRZ	量产	Hi-Temp Comm	20 Ld QFN	2
ISL95870BHRZ-T	量产	Hi-Temp Comm	20 Ld QFN T+R	2
ISL95870BIRZ	量产	工业级	20 Ld QFN	2
ISL95870BIRZ-T	量产	工业级	20 Ld QFN T+R	2