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Single Quick-PWM Step-Down Controller with Dynamic REFIN

High Efficiency, Excellent Transient Response, and High DC-Output Accuracy Needed for Stepping Down High Voltages

Product Details

Key Features

Applications/Uses

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2
VIN (V) (max) 26
VOUT1 (V) (min) 0
VOUT1 (V) (max) 23
IOUT1 (A) (max) 10
Switch Type External
Output Adjust. Method Dyn. REF In
Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 600
Package/Pins TDFN/14
Budgetary
Price (See Notes)
1.52
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2
VIN (V) (max) 26
VOUT1 (V) (min) 0
VOUT1 (V) (max) 23
IOUT1 (A) (max) 10
Switch Type External
Output Adjust. Method Dyn. REF In
Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 600
Package/Pins TDFN/14
Budgetary
Price (See Notes)
1.52

Key Features

  • Quick-PWM with Fast Transient Response
  • Supports Any Output Capacitor
    • No Compensation Required with Polymers/Tantalum
    • Stable with Ceramic Output Capacitors Using External Compensation
  • Precision 2V ±10mV Reference
  • Dynamically Adjustable Output Voltage (0 to 0.9 x VIN Range)
    • Feedback Input Regulates to 0 to 2V REFIN Voltage
    • 0.5% VOUT Accuracy Over Line and Load
  • 26V Maximum Input Voltage Rating
  • Resistively Programmable Switching Frequency
  • Undervoltage/Thermal Protection
  • Voltage Soft-Start and Soft-Shutdown
  • Monotonic Power-Up with Precharged Output
  • Power-Good Window Comparator

Applications/Uses

  • DDR Memory-VDDQ or VTT
  • GPU Core Supply
  • I/O and Chipset Supplies
  • Notebook Computers
  • Point-of-Load Applications
  • Step-Down Power Supply

Description

The MAX17024 pulse-width modulation (PWM) controller provides high efficiency, excellent transient response, and high DC-output accuracy needed for stepping down high-voltage batteries to generate low-voltage core or chipset/RAM bias supplies in notebook computers. The output voltage can be controlled using the dynamic REFIN, which supports input voltages between 0 to 2V. The REFIN adjustability combined with a resistive voltage-divider on the feedback input allows the MAX17024 to be configured for any output voltage between 0 to 0.9 x VIN.

Maxim's proprietary Quick-PWM™ quick-response, constant-on-time PWM control scheme handles wide input/output voltage ratios (low-duty-cycle applications) with ease and provides 100ns "instant-on" response to load transients while maintaining a relatively constant switching frequency. Strong drivers allow the MAX17024 to efficiently drive large synchronous-rectifier MOSFETs.

The controller senses the current across the sense resistor series with the synchronous rectifier to achieve highly accurate valley current-limit protection.

The MAX17024 includes a voltage-controlled soft-start and soft-shutdown to limit the input surge current, provide a monotonic power-up (even into a precharged output), and provide a predictable power-up time. The controller also includes output undervoltage and thermal-fault protection.

The MAX17024 is available in a tiny 14-pin, 3mm x 3mm TDFN package. For space-constrained applications, refer to the MAX17016 single step-down with 26V internal MOSFETs capable of supporting 10A continuous load. The MAX17016 is available in a small 40-pin, 6mm x 6mm TQFN package.

Simplified Block Diagram

MAX17024: Functional Block Diagram MAX17024: Functional Block 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 .