应用领域：电源电池

方案类型：芯片级方案

主控芯片：ISL98855、ISL95857、ISL95520、ISL95808

方案概述

方案特性

采用IMVP电压调节器，这种方式能够使高负载状态下的CPU耗电量降低。所以和采用静态电压调节器的系统相比，配备IMVP电压调节器的笔记本电脑会有比较低的TDP、平均与主动耗电量。

方案框图

应用领域

PC

超级笔记本

典型应用场景

IMVP

IMVP，Intel移动电压配置，是按照处理器的工作状态动态调节处理器电压(VCC)的技术，从而自动降低处理器功耗。

全称：Intel Mobile Voltage Positioning

Intel移动电压配置(IMVP)，是按照处理器的工作状态动态调节处理器电压(VCC)的技术，从而自动降低处理器功耗。在给定功耗下允许更高的处理器时钟频率;在给定时钟频率下能够获得更低功耗。

IMVP由Intel公司制定，有多个历史版本，目前最新版本为IMVP-7。

工作原理编辑

CPU核心电压的配置方式有静态电压调节和IMVP电压调节两种，下面通过对比两种电压调节方式的区别来介绍IMVP工作原理。

静态电压调节

传统的静态电压调节器在提供CPU电力时，电压会保持不变，无论处理器的负载多重，核心电压都会保持在容忍范围内。

采用静态电压调节器时，CPU核心电压的变化如图-1所示

IMVP电压调节

采用IMVP电压调节器时，CPU核心电压的变化

使用IMVP电压调节器提供CPU电力时，核心电压会随着处理器负载的上升，而逐步下降。

采用IMVP电压调节器时，CPU核心电压的变化如图-2 所示

这种方式能够使高负载状态下的CPU耗电量降低。所以和采用静态电压调节器的系统相比，配备IMVP电压调节器的笔记本电脑会有比较低的TDP、平均与主动耗电量。

ISL95857

1+2+1 Voltage Regulator for Intel IMVP8™ CPUs

Key Features

Supports Intel serial data bus interface

System input power monitor (PSYS) supported

Three output controller

VR A supports 1-phase VR design

VR B configurable for 2-, 1-phase VR design

VR C supports 1-phase VR design

0.5% system accuracy over temperature

Low supply current in PS4 state

Supports multiple current sensing methods

Lossless inductor DCR current sensing

Precision resistor current sensing

Differential remote voltage sensing

Programmable SVID address

Resistor programmable address selection, IMAX and switching frequency

Description

Compliant with Intel IMVP8™, the ISL95857 provides a complete power solution for Intel microprocessors supporting core, graphics and system agent rails. The controller provides control and protection for three Voltage Regulator (VR) outputs. VR A and VR C outputs support 1-phase operation only, while VR B is configurable for 2- or 1-phase operation. The address options programmable for these three outputs allow for maximum flexibility in support of the IMVP8™ CPU. All three VRs share a common serial control bus to communicate with the CPU and achieve lower cost and smaller board area compared with a two-chip approach.

Based on Intersil’s Robust Ripple Regulator (R3™) technology, the R3™ modulator has many advantages compared to traditional modulators. These include faster transient settling time, variable switching frequency in response to load transients and improved light-load efficiency due to diode emulation mode with load-dependent low switching frequency.

The ISL95857 has several other key features. The controller provides PWM outputs, which support Intel DrMOS power stages (or similar) and discrete power stages using the Intersil ISL95808 high voltage synchronous rectified buck MOSFET driver. The controller complies with IMVP8™ PS4 power requirements and supports power stages and drivers which are compatible. The ISL95857 supports the system input power monitor (PSYS) option. The controller supports either DCR current sensing with a single NTC thermistor for DCR temperature compensation or more precision through resistor current sensing if desired. All three outputs feature remote voltage sense, programmable IMAX, adjustable switching frequency, OC protection and a single VR_READY power-good indicator.

Applications

IMVP8 compliant notebooks, desktops, ultrabooks and tablets

ISL95520

SMBus Interface Hybrid Power Boost (HPB) and Narrow VDC (NVDC) Configurations Combo Battery Charger

Key Features

Configurable as HPB charger or NVDC charger

Compliant with Intel PROCHOT# and PSYS requirements

Adapter current monitor and battery discharging current monitor

Uses NFET for all the switches

Supports removal of battery during battery learn mode

Actively controlled inrush current to prevent FET damage

SMBus programmable settings and high accuracy

Comprehensive protection features include

PROCHOT# indicator for system low voltage, adapter overcurrent, battery overcurrent or system overheating

Hardware-based adapter-current and battery-current limits

Supports sudden removal of battery in system Turbo mode

16 switching frequency options from 350kHz to 1MHz

Low quiescent current

Intersil Robust Ripple Regulator (R3™) modulation scheme provides excellent light load efficiency and fast dynamic response

32 Ld 4x4mm2 QFN package

Pb-free (RoHS compliant)

Description

The ISL95520 is a highly versatile combo battery charger configurable for operating as either a Hybrid Power Boost (HPB) charger or a Narrow VDC (NVDC) charger, supporting 2-, 3- or 4-cell batteries. Both configurations allow the battery to work with the adapter together to supply the system load when it exceeds the adapter capability, referred to as system Turbo mode. HPB charger configuration reverse-boosts battery energy to system bus in order to help the adapter provide the system power in Turbo mode.

NVDC charger configuration quickly turns on BGATE to enable the battery to help adapter provide the system power in Turbo mode. The ISL95520 uses N-channel MOSFETs (NFETs) for all the switches to achieve the best performance and lowest BOM cost. The internal charge pump is capable of turning on all the NFETs fast or slow depending on the circumstance or the need. The ability to quickly turn on NFETs prevents system bus voltage drop when battery is suddenly removed in Turbo mode or in battery learn mode.

The ISL95520 provides many protection features including PROCHOT# indicator for system low voltage, adapter overcurrent, battery overcurrent or overheating, with an array of SMBus programmable parameters for maximum flexibility. It also features hardware based adapter current limit and battery-current limit in addition to SMBus programmable limits.

The ISL95520 provides high accuracy adapter current monitor, battery current monitor and system power monitor outputs. To provide maximum flexibility for working with high power and low power systems, it provides several configurable current-sense resistor value options to achieve the best trade-off of current sensing accuracy vs power loss.

The ISL95520 uses Intersil patented Robust Ripple Regulator (R3™) modulation scheme to provide excellent light load efficiency and fast dynamic response. It is available in a 32 Ld 4x4mm2 QFN package.

Applications

Devices with rechargeable 2-, 3- or 4-cell batteries

ISL95808

High Voltage Synchronous Rectified Buck MOSFET Driver

Key Features

Dual MOSFET drivers for synchronous rectified bridge

Adaptive shoot-through protection

0.5Ω ON-resistance and 4A sink current capability

Supports high switching frequency up to 2MHz

Fast output rise and fall time

Low propagation delay

Three-state PWM input for power stage shutdown

Internal bootstrap Schottky diode

Low shutdown supply current (5V, 3μA)

Diode emulation for enhanced light-load efficiency and prebiased start-up applications

VCC POR (Power-On Reset) feature integrated

Low three-state shutdown hold-off time (typical 160ns)

DFN package

Pb-free (RoHS compliant)

Description

The ISL95808 is a high frequency, dual MOSFET driver with low shutdown current, optimized to drive two N-Channel power MOSFETs in a synchronous-rectified buck converter topology. It is especially suited for mobile computing applications that require high efficiency and excellent thermal performance. The driver, combined with an Intersil multiphase Buck PWM controller, forms a complete single-stage core-voltage regulator solution for advanced mobile microprocessors.

The ISL95808 features a 4A typical sinking current for the lower gate driver. This current is capable of holding the lower MOSFET gate off during the rising edge of the phase node. This prevents shoot-through power loss caused by the high dv/dt of phase voltages. The operating voltage matches the 30V breakdown voltage of the MOSFETs commonly used in mobile computer power supplies.

The ISL95808 also features a three-state PWM input. This PWM input, working together with Intersil’s multiphase PWM controllers, will prevent negative voltage output during CPU shutdown. This feature eliminates a protective Schottky diode usually seen in microprocessor power systems.

MOSFET gates can be efficiently switched up to 2MHz using the ISL95808. Each driver is capable of driving a 3000pF load with propagation delays of 8ns and transition times under 10ns. Bootstrapping is implemented with an internal Schottky diode. This reduces system cost and complexity, while allowing for the use of higher performance MOSFETs. Adaptive shoot--through protection is integrated to prevent both MOSFETs from conducting simultaneously.

A diode emulation feature is integrated in the ISL95808 to enhance converter efficiency at light load conditions. This feature also allows for monotonic start-up into prebiased outputs. When diode emulation is enabled, the driver will allow discontinuous conduction mode by detecting when the inductor current reaches zero and subsequently turning off the low-side MOSFET gate.

The ISL95808 also features very low shutdown supply current (5V, 3μA) to ensure the low power consumption.

Applications

Core voltage supplies for Intel® and AMD™ mobile microprocessors

High frequency low profile DC/DC converters

High current low output voltage DC/DC converters

High input voltage DC/DC converters