MAX17498C
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MAX17498C

AC-DC and DC-DC Peak-Current-Mode Converters for Flyback/Boost Applications

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Peak-Current-Mode Converters Enable Compact, Cost-Effective, and Highly Flexible Isolated/Nonisolated Power Supplies

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Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $1.71
Features
  • Peak Current-Mode Converter
  • Current-Mode Control Provides Excellent Transient Response
  • Fixed Switching Frequency
    • 250kHz: MAX17498A/MAX17498C
    • 500kHz: MAX17498B
  • Flexible Error Amplifier to Regulate Both Positive and Negative Outputs
  • Programmable Soft-Start to Reduce Input Inrush Current
  • Programmable Voltage or Current Soft-Start
  • Power-Good Signal (PGOOD)
  • Reduced Power Dissipation Under Fault
    • Overcurrent Protection
    • Thermal Shutdown with Hysteresis
  • Robust Protection Features
    • Programmable Current Limit
    • Input Overvoltage Protection
  • Optimized Loop Performance
    • Fixed Default Slope Compensation in Current Soft-Start
    • Fixed Default and Programmable Slope Compensation in Voltage Soft-Start
  • High Efficiency
    • Low RDSON, 175mΩ, 65V Rated Internal n-Channel MOSFET
    • No Current-Sense Resistor
  • Optional Spread Spectrum
  • Space-Saving, 16-Pin (3mm x 3mm) TQFN Package
Additional Details
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The MAX17498A/MAX17498B/MAX17498C devices are current-mode fixed-frequency flyback/boost converters with a minimum number of external components. They contain all the control circuitry required to design wide input voltage isolated and nonisolated power supplies. The MAX17498A has its rising/falling undervoltage lockout (UVLO) thresholds optimized for universal offline (85V AC to 265V AC) applications, while the MAX17498B/MAX17498C support UVLO thresholds suitable to low-voltage DC-DC applications.
The switching frequency of the MAX17498A/MAX17498C is 250kHz, while that of the MAX17498B is 500kHz. These frequencies allow the use of tiny magnetic and filter components, resulting in compact, cost-effective power supplies. An EN/UVLO input allows the user to start the power supply precisely at the desired input voltage, while also functioning as an on/off pin. The OVI pin enables implementation of an input overvoltage-protection scheme that ensures that the converter shuts down when the DC input voltage exceeds the desired maximum value.
The devices incorporate a flexible error amplifier and an accurate reference voltage (REF) to enable the end user to regulate both positive and negative outputs. Programmable current limit allows proper sizing and protection of the primary switching FET. The devices support a maximum duty cycle greater than 92% and provide programmable slope compensation to allow optimization of control loop performance. The devices provide an open-drain PGOOD pin that serves as a power-good indicator and enters the high-impedance state to indicate that the flyback/boost converter is in regulation. An SS pin allows programmable soft-start time for the flyback/boost converter. Hiccup-mode overcurrent protection and thermal shutdown are provided to minimize dissipation under overcurrent and overtemperature fault conditions. The devices are available in a space-saving, 16-pin (3mm x 3mm) TQFN package with 0.5mm lead spacing.

Applications

  • Front-End AC/DC Power Supplies for Industrial Applications (Isolated and Nonisolated)
  • Telecom Power Supplies
  • Wide Input Range DC Input Flyback/Boost Industrial Power Supplies
Part Models 2
1ku List Price Starting From $1.71

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

PCN

Dec 13, 2013

- 1355

MECHANICAL DATASHEET

MAX17498CATE+

PRODUCTION

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Part Models

Product Lifecycle

PCN

Dec 13, 2013

- 1355

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MECHANICAL DATASHEET

MAX17498CATE+

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 2

MAX17498BBEVKIT

Evaluation Kit for the MAX17498B

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MAX17498BBEVKIT

Evaluation Kit for the MAX17498B

Evaluation Kit for the MAX17498B

Features and Benefits

  • 4.5V to 10V Input Range
  • Output Voltage: 24V at 100mA
  • 500kHz Switching Frequency
  • Integrated n-Channel MOSFET
  • Efficiency Up to 94.2%
  • Resistor-Programmable UVLO/OVI Threshold
  • Open-Drain Power-Good Signal (PGOOD)
  • Low-Cost Boost Converter Design
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Detail

The MAX17498BB evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board to evaluate the MAX17498B peak-current-mode controller in a stepup (boost) configuration. The EV kit output is configured for 24V output voltage, which can supply up to 100mA of current. The input voltage range is from 4.5V to 10V.
The EV kit features a 500kHz fixed frequency for optimum efficiency and component size. High efficiency up to 94.2% is achieved using a boost converter, providing an output power up to 2.4W.

Applications

  • Front-End AC/DC Power Supplies for Industrial Applications (Isolated and Nonisolated)
  • Telecom Power Supplies
  • Wide Input Range DC Input Flyback/Boost Industrial Power Supplies

MAX17498BEVKIT

Evaluation Kit for the MAX17498B

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MAX17498BEVKIT

Evaluation Kit for the MAX17498B

Evaluation Kit for the MAX17498B

Features and Benefits

  • +18V to +36V DC Voltage Input Range
  • Isolated 5V, 1.5A Output
  • Fixed 500kHz Switching Frequency
  • 88% Efficiency
  • Cycle-by-Cycle Current Limit
  • High-Accuracy UVLO
  • PGOOD Open-Drain Output
  • Low-Cost Flyback Design
  • Configurable for Primary-Side Regulation
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Detail

The MAX17498B evaluation kit (EV kit) is a fully assembled and tested circuit board that contains an isolated 7W flyback DC-DC converter. The circuit uses the MAX17498B current-mode, fixed-frequency flyback converter in a 16-pin TQFN package with an exposed pad. The EV kit demonstrates the IC's cycle-by-cycle current limit, soft-start, and UVLO features.

The EV kit circuit output is configured for an isolated +5V and provides up to 1.5A of current. Low cost and high efficiency up to 88% are achieved using a flyback DC-DC converter topology operating at a fixed 500kHz switching frequency. The surface-mount transformer provides up to +1500V galvanic isolation at the output.

The EV kit operates from a +18V to +36V power supply capable of providing up to 1A.

Applications

  • Front-End AC/DC Power Supplies for Industrial Applications (Isolated and Nonisolated)
  • Telecom Power Supplies
  • Wide Range DC Input Flyback/Boost Industrial Power Supplies
Tools & Simulations

Tools & Simulations 1

Reference Designs

Reference Designs 4

maxrefdes63fig00

8-Channel Digital Output Micro PLC Card

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8-Channel, Digital-Input Micro PLC Card

MAXREFDES60

16-Bit Analog Output Micro PLC

MAXREFDES61 - Block Diagram

16-Bit Four-Channel Analog Input Micro PLC Card

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MAXREFDES61

16-Bit Four-Channel Analog Input Micro PLC Card

16-Bit Four-Channel Analog Input Micro PLC Card

Features and Benefits

  • High accuracy
  • -10 to +10V ±20% voltage inputs
  • 4 to 20mA +20% current inputs
  • Isolated power and data
  • Micro PLC form factor
  • Device drivers
  • Example C source code
  • Test data
View Detailed Reference Design external link

Design & Integration Tools

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