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Dual and Combinable QPWM Graphics Core Controllers for Notebook Computers

The Two Switched-Mode Power Supplies Can Be Combined to Operate in a Two-Phase Single-Output Mode

Product Details

The MAX17007A/MAX17007B/MAX17008 are dual Quick-PWM™ step-down controllers intended for general power generation in battery-powered systems. The two switched-mode power supplies (SMPSs) can also be combined to operate in a two-phase single-output mode. Constant on-time Quick-PWM operation provides fast response to load transients and handles wide input/output (I/O) voltage ratios with ease, while maintaining a relatively constant switching frequency. The switching frequency can be individually adjusted between 200kHz and 600kHz with external resistors. Differential output current sensing allows output sense-resistor sensing for an accurate current limit, or lossless inductor direct-current resistance (DCR) current sensing for lower power dissipation while maintaining 0.7% output accuracy. Overvoltage (MAX17007A/MAX17007B only), undervoltage protection, and accurate user-selectable current limits (15mV, 30mV, 45mV, and 60mV) ensure robust operations.

The SMPS outputs can operate in skip mode or in ultrasonic mode for improved light-load efficiency. The ultrasonic mode eliminates audible noises by maintaining a minimum switching frequency of 25kHz in pulse-skipping mode.

The output voltage of SMPS1 can be dynamically adjusted by changing the voltage at the REFIN1 pin. The device includes a 0.5% accurate reference output that can be used to set the REFIN1 voltage. An external 5V bias supply is required to power the internal circuitry and its gate drivers.

Independent on/off controls with well-defined logic thresholds and independent open-drain power-good outputs provide flexible system configurations. To prevent current surges at startup, the internal voltage target is slowly ramped up from zero to the final target with a slew rate of 1.3mV/µs for SMPS1 at CSL1 and 0.65mV/µs for SMPS2 at FB2. To prevent the output from ringing off below ground in shutdown, the internal voltage target is ramped down from its previous value to zero with the same respective slew rates. Integrated bootstrap switches eliminate the need for external bootstrap diodes.

The MAX17007A/MAX17007B/MAX17008 are available in a space-saving, 28-pin, 4mm x 4mm, TQFN package with an exposed backside pad. The MAX17007B improves crosstalk performance over the MAX17007A.

Key Features

  • Dual Quick-PWM with Fast Transient Response
  • Automatic Dynamic REFIN1 Detection and PGOOD1/Fault Blanking
  • Fixed and Adjustable Output Voltages
    • ±0.7% Output Accuracy Over Line and Load
    • OUT1: 0 to 2V Dynamic Output or Preset 1.05V
    • OUT2: 0.7V to 2V Range or Preset 1.5V
  • Resistor-Programmable Switching Frequency
  • Integrated BST Switches
  • Differential Current-Sense Inputs
    • Low-Cost DCR Sensing or Accurate Current-Sense Resistors
    • Internally Coupled Current-Sense Compensation
  • Combinable Mode Supports High-Current Dynamic Output Voltages
  • Selectable Forced-PWM, Pulse Skip, or Ultrasonic Mode Operation
  • 26V Maximum Input Voltage Rating
  • Independent Enable Inputs
  • Independent Power-Good Outputs
  • Overvoltage Protection (MAX17007A/MAX17007B Only)
  • Undervoltage/Thermal Protection
  • Voltage Soft-Start and Soft-Shutdown

Applications/Uses

  • 2 to 4 Li+ Cells Battery-Powered Devices
  • GPU Core Supplies
  • Low-Power I/O Supplies
  • Notebook Computers
Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 26
VOUT1 (V) (min) 0
VOUT1 (V) (max) 2
IOUT1 (A) (max) 25
Switch Type External
Preset VOUT (V) 1.05
1.5
Output Adjust. Method Dyn. REF In
Preset
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 2
Switching Frequency (kHz) 300
Package/Pins TQFN/28
Budgetary
Price (See Notes)
$4.57 @1k
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Simplified Block Diagram

MAX17007A, MAX17008: Functional Diagram MAX17007A, MAX17008: Functional Diagram Zoom icon

Technical Docs

Design & Development

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Description

The MAX17007A evaluation kit (EV kit) demonstrates the standard 12A application circuit of the MAX17007A. This DC-DC converter steps down high-voltage batteries to generate low-voltage core or chipset/RAM bias supplies in notebook computers.

The default MAX17007A EV kit design provides two independent outputs (OUT1 and OUT2) from a 7V to 24V battery-input range. OUT1 is configured for a dynamic 1V/1.2V output voltage and OUT2 is configured to a preset 1.5V output voltage. Each output delivers at least 12A. The OUT1 and OUT2 outputs operate at 270kHz and 330kHz switching frequencies, respectively.

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Features

  • 7V to 24V Input Range
  • Preset/Adjustable/Dynamic Output Voltage (OUT1)
  • Preset/Adjustable Output Voltage (OUT2)
  • 12A Output Currents for Each Output
  • 24A Output Current in Combined Mode
  • 91% Efficiency (VIN = 12V, VOUT1 = 1.2V at 5A)
  • 92% Efficiency (VIN = 12V, VOUT2 = 1.5V at 5A)
  • Power-Good Output Indicators (PGOOD1 and PGOOD2)
  • Low-Profile Surface-Mount Components
  • Fully Assembled and Tested
  • Lead-Free and RoHS Compliant

Description

The MAX17039 evaluation kit (EV kit) demonstrates the high-power, dynamically adjustable, multiphase IMVP-7 notebook application circuit. This DC-DC converter steps down high-voltage batteries and/or AC adapters, generating two precision, low-voltage CPU/GPU core rails. The EV kit meets the Intel mobile IMVP-7 CPU's transient voltage specification, power-good signaling, voltage regulator thermal monitoring (active-low VR_HOT), power-good outputs (VR__READY), and serial VID communication and control specification. The MAX17039 consists of two high-current SMPSs for the CPU and GPU cores. The CPU regulator is a 3-phase interleaved Quick-PWM™ architecture with one MAX8791 single-synchronous MOSFET driver. The second GPU regulator is also a 1-phase Quick-PWM architecture. The 3-phase CPU core SMPS runs 120° out-of-phase for true interleaved operation, minimizing input capacitance.

Both CPU/GPU output voltages are controlled independently and are dynamically changed through a 3-wire serial VID interface (3-wire SVID: VCLK, VDIO, active-low ALERT), allowing the switching regulators to be individually programmed to different voltages. The EV kit includes active voltage positioning with adjustable gain, reducing power dissipation and bulk output capacitance requirements. A slew-rate controller allows controlled transitions among VID codes, controlled soft-start, and shutdown. SVID also allows each regulator to be individually set into a low-power, pulse-skipping state.

The MAX17039 provides a digitally adjustable 0 to 1.5200V output-voltage range from a 7V to 20V battery-input range. Each phase of the CPU core SMPS is designed for a 20A thermal-design current and delivers up to 33A peak output current for a total of 99A. The 1-phase GPU core SMPS is designed for 20A thermal-design current and delivers up to 33A peak output current. The CPU core SMPS operates at 350kHz switching frequency (per phase) and has superior line- and load-transient response. The GPU core SMPS operates at 440kHz switching frequency relative CPU core SMPS.

The MAX17039 EV kit also evaluates the MAX17000 and MAX17007A DC-DC converters. The EV kit also includes Windows® 2000-, Windows XP®-, and Windows Vista®-compatible software that provides a simple graphical user interface (GUI) for exercising the features of the MAX17039.

View Details

Features

  • MAX17039:
    • Intel IMVP-7 Serial VID-Compliant 25MHz Interface
    • 0 to 1.5200V Output-Voltage Range
    • 7V to 20V Input-Voltage Range
    • Core CPU SMPS
      • 3-Phase, Fast-Response Interleaved, Quick-PWM
      • Two Internal Drivers + One External Driver (MAX8791)
      • Transient-Suppression Feature
      • 99A Peak Load-Current Capability (33A Each Phase)
      • 350kHz Switching Frequency (per Phase)
    • Core GPU SMPS
      • 1-Phase, Fast-Response Internal Driver Quick-PWM
      • 33A Peak Load-Current Capability
      • 440kHz Switching Frequency
    • Active Voltage Positioning with Adjustable Gain
    • Power-Good (VR__READY) Outputs
    • External Thermal-Fault Detection (Active-Low VR_HOT)
    • Output Current Monitors (IMON_)
    • Overvoltage-, Undervoltage-, and Thermal-Fault Protections
    • 56-Pin Thin QFN Package
  • MAX17000:
    • Complete DDR Supplies: VCCDDR, VTTDDR, VTTR
    • 7V to 20V Input-Voltage Range
    • 400kHz Switching Frequency
    • 10A Output Current Capability (VCCDDR)
    • 2A Output Current Capability (VTTDDR)
    • 3mA Output Current Capability (VTTR)
    • Overvoltage Protection
    • Power-Good Output Indicators (D15 and D16)
    • 24-Pin Thin QFN Package
  • MAX17007A:
    • I/O Supplies: VTT1 and VTT2
    • 7V to 20V Input-Voltage Range
    • 300kHz Switching Frequency
    • 6A Output Current Capability (VTT1)
    • 21A Output Current Capability (VTT2)
    • Overvoltage-, Undervoltage-, and Thermal-Fault Protections
    • Power-Good Output Indicators (D19 and D20)
    • 28-Pin Thin QFN Package

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Parameters

Key Features

  • Dual Quick-PWM with Fast Transient Response
  • Automatic Dynamic REFIN1 Detection and PGOOD1/Fault Blanking
  • Fixed and Adjustable Output Voltages
    • ±0.7% Output Accuracy Over Line and Load
    • OUT1: 0 to 2V Dynamic Output or Preset 1.05V
    • OUT2: 0.7V to 2V Range or Preset 1.5V
  • Resistor-Programmable Switching Frequency
  • Integrated BST Switches
  • Differential Current-Sense Inputs
    • Low-Cost DCR Sensing or Accurate Current-Sense Resistors
    • Internally Coupled Current-Sense Compensation
  • Combinable Mode Supports High-Current Dynamic Output Voltages
  • Selectable Forced-PWM, Pulse Skip, or Ultrasonic Mode Operation
  • 26V Maximum Input Voltage Rating
  • Independent Enable Inputs
  • Independent Power-Good Outputs
  • Overvoltage Protection (MAX17007A/MAX17007B Only)
  • Undervoltage/Thermal Protection
  • Voltage Soft-Start and Soft-Shutdown

Applications/Uses

  • 2 to 4 Li+ Cells Battery-Powered Devices
  • GPU Core Supplies
  • Low-Power I/O Supplies
  • Notebook Computers

Description

The MAX17007A/MAX17007B/MAX17008 are dual Quick-PWM™ step-down controllers intended for general power generation in battery-powered systems. The two switched-mode power supplies (SMPSs) can also be combined to operate in a two-phase single-output mode. Constant on-time Quick-PWM operation provides fast response to load transients and handles wide input/output (I/O) voltage ratios with ease, while maintaining a relatively constant switching frequency. The switching frequency can be individually adjusted between 200kHz and 600kHz with external resistors. Differential output current sensing allows output sense-resistor sensing for an accurate current limit, or lossless inductor direct-current resistance (DCR) current sensing for lower power dissipation while maintaining 0.7% output accuracy. Overvoltage (MAX17007A/MAX17007B only), undervoltage protection, and accurate user-selectable current limits (15mV, 30mV, 45mV, and 60mV) ensure robust operations.

The SMPS outputs can operate in skip mode or in ultrasonic mode for improved light-load efficiency. The ultrasonic mode eliminates audible noises by maintaining a minimum switching frequency of 25kHz in pulse-skipping mode.

The output voltage of SMPS1 can be dynamically adjusted by changing the voltage at the REFIN1 pin. The device includes a 0.5% accurate reference output that can be used to set the REFIN1 voltage. An external 5V bias supply is required to power the internal circuitry and its gate drivers.

Independent on/off controls with well-defined logic thresholds and independent open-drain power-good outputs provide flexible system configurations. To prevent current surges at startup, the internal voltage target is slowly ramped up from zero to the final target with a slew rate of 1.3mV/µs for SMPS1 at CSL1 and 0.65mV/µs for SMPS2 at FB2. To prevent the output from ringing off below ground in shutdown, the internal voltage target is ramped down from its previous value to zero with the same respective slew rates. Integrated bootstrap switches eliminate the need for external bootstrap diodes.

The MAX17007A/MAX17007B/MAX17008 are available in a space-saving, 28-pin, 4mm x 4mm, TQFN package with an exposed backside pad. The MAX17007B improves crosstalk performance over the MAX17007A.

Simplified Block Diagram

MAX17007A, MAX17008: Functional Diagram MAX17007A, MAX17008: Functional Diagram 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