Top

Notebook CPU Step-Down Controller for Intel Mobile Voltage Positioning (IMVP-II)

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2
VIN (V) (max) 28
VOUT1 (V) (min) 0.6
VOUT1 (V) (max) 1.75
IOUT1 (A) (max) 20
Switch Type External
Output Adjust. Method Digital/VID
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 1000
Package/Pins QSOP/28
Budgetary
Price (See Notes)
0
View Less

Simplified Block Diagram

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2
VIN (V) (max) 28
VOUT1 (V) (min) 0.6
VOUT1 (V) (max) 1.75
IOUT1 (A) (max) 20
Switch Type External
Output Adjust. Method Digital/VID
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 1000
Package/Pins QSOP/28
Budgetary
Price (See Notes)
0

Key Features

  • Quick-PWM Architecture
  • ±1% VOUT Accuracy Over Line and Load
  • 5-Bit On-Board DAC with Input Muxes
  • Precision-Adjustable VOUT Slew Control
  • 0.6V to 1.75V Output Adjust Range
  • Precision Offset Control
  • Supports Voltage-Positioned Applications
  • 2V to 28V Battery Input Range
  • Requires a Separate 5V Bias Supply
  • 200/300/550/1000kHz Switching Frequency
  • Over/Undervoltage Protection
  • Drives Large Synchronous-Rectifier FETs
  • 700µA (typ) ICC Supply Current
  • 2µA (typ) Shutdown Supply Current
  • 2V ±1% Reference Output
  • VGATE Blanking During Transition
  • Small 28-Pin QSOP Package

Applications/Uses

  • 2-Cell to 4-Cell Li+ Battery to CPU Core Supply Converters
  • 5V to CPU Core Supply Converters
  • IMVP-II Notebook Computers

Description

The MAX1718 step-down controller is intended for core CPU DC-DC converters in notebook computers. It features a dynamically adjustable output, ultra-fast transient response, high DC accuracy, and high efficiency needed for leading-edge CPU core power supplies. Maxim's proprietary Quick-PWM™ quick-response, constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns "instant-on" response to load transients while maintaining a relatively constant switching frequency.

The output voltage can be dynamically adjusted through the 5-bit digital-to-analog converter (DAC) over a 0.6V to 1.75V range. The MAX1718 has an internal multiplexer that accepts three unique 5-bit VID DAC codes corresponding to Performance, Battery, and Suspend modes. Precision slew-rate control provides "just-in-time" arrival at the new DAC setting, minimizing surge currents to and from the battery.

The internal DAC of the MAX1718B is synchronized to the slew-rate clock for improved operation under aggressive power management of newer chipsets and operating systems that can make incomplete mode transitions.

A pair of complementary offset control inputs allows easy compensation for IR drops in PC board traces or creation of a voltage-positioned power supply. Voltage-positioning modifies the load-transient response to reduce output capacitor requirements and total system power dissipation.

Single-stage buck conversion allows these devices to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down the 5V system supply instead of the battery) at a higher switching frequency allows the minimum possible physical size.

The MAX1718 is available in a 28-pin QSOP package.

Simplified Block Diagram

MAX1718: Typical Operating Circuit MAX1718: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .