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Single Quick-PWM Step-Down Controller with Dynamic REFIN

Small-Packaged, Single Step-Down with Dynamic REFIN

Product Details

Key Features

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) 13
Switch Type External
Output Adjust. Method Dyn. REF In
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 300
Package/Pins TDFN/14
Budgetary
Price (See Notes)
4.93
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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) 13
Switch Type External
Output Adjust. Method Dyn. REF In
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 300
Package/Pins TDFN/14
Budgetary
Price (See Notes)
4.93

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 VIN Range)
    • Feedback Input Regulates to 0 to 2V REFIN Voltage
    • 0.5% VOUT Accuracy Over Line and Load
  • 26V Maximum Input Voltage Rating
  • Adjustable Valley Current-Limit Protection
    • Thermal Compensation with NTC
    • Supports Foldback Current Limit
  • Resistively Programmable Switching Frequency
  • Overvoltage Protection
  • 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 MAX8792 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 dynamically 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 MAX8792 to be configured for any output voltage between 0 to 0.9 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 MAX8792 to efficiently drive large synchronous-rectifier MOSFETs.

The controller senses the current across the synchronous rectifier to achieve a low-cost and highly efficient valley current-limit protection. The adjustable current-limit threshold provides a high degree of flexibility, allowing thermally compensated protection using an NTC or foldback current-limit protection using a voltage-divider derived from the output.

The MAX8792 includes a voltage-controlled soft-start and soft-shutdown in order to limit the input surge current, provide a monotonic power-up (even into a precharged output), and provide a predictable powerup time. The controller also includes output fault protection— undervoltage and overvoltage protection—as well as thermal-fault protection.

The MAX8792 is available in a tiny 14-pin, 3mm x 3mm TDFN package. For space-constrained applications, refer to the MAX17016 single step-down with 10A, 26V internal MOSFETs available in a small 40-pin, 6mm x 6mm TQFN package.

Simplified Block Diagram

MAX8792: Typical Operating Circuit MAX8792: 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 .