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4.5V to 60V Input, Ultra-Small, High-Efficiency, Iso-Buck DC-DC Converter

Reduce External Components, Solution Size and Cost for DC-DC Isolation

Product Details

Key Features

Applications/Uses

Parametric specs for Step-Down/Up Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 60
Switch Type Internal
VOUT1 Tolerance (±%) 1
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
ICC (mA) (max) 1.16
# DC-DC Outputs 1
Alternate Topology Step-Down
Step-Up
Switching Frequency (kHz) 500
Design Tools EE-Sim
Package/Pins TQFN/20
Oper. Temp. (°C) -40 to +125
Budgetary
Price (See Notes)
2.65
Parametric specs for Isolated Power Supplies
VIN (V) (min) 4.5
VIN (V) (max) 60
Topology Flyback
Application (VIN) Base Station (24V)
Industrial (24V)
Switch Type Internal
Control Loop Current Mode
Feedback Primary Side
Switching Frequency (kHz) 100-500
Duty Cycle (%) (max) 97.5
Oper. Temp. (°C) -40 to +125
Package/Pins TQFN/20
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down/Up Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 60
Switch Type Internal
VOUT1 Tolerance (±%) 1
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
ICC (mA) (max) 1.16
# DC-DC Outputs 1
Alternate Topology Step-Down
Step-Up
Switching Frequency (kHz) 500
Design Tools generateDesignEESIMUrl('http://maxim.transim.com/pwm2/designreq/Index?partId=10638', '')
Package/Pins TQFN/20
Oper. Temp. (°C) -40 to +125
Budgetary
Price (See Notes)
2.65
Parametric specs for Isolated Power Supplies
VIN (V) (min) 4.5
VIN (V) (max) 60
Topology Flyback
Application (VIN) Base Station (24V)
Industrial (24V)
Switch Type Internal
Control Loop Current Mode
Feedback Primary Side
Switching Frequency (kHz) 100-500
Duty Cycle (%) (max) 97.5
Oper. Temp. (°C) -40 to +125
Package/Pins TQFN/20

Key Features

  • Eliminates External Components and Reduces Total Cost
    • Synchronous Primary Operation for High Efficiency and Reduced Cost
    • All-Ceramic Capacitors, Ultra-Compact Layout
  • Supports Numerous Isolated DC-DC Applications
    • Wide 4.5V to 60V Input Voltage Range
    • Delivers up to 3.2A Peak Current
    • 100kHz to 500kHz Adjustable Frequency with External Synchronization
    • Available in a 20-Pin, 4mm x 4mm TQFN Package
  • Reduces Power Dissipation
    • Peak Efficiency > 90%
    • Shutdown Current = 2.8μA (typ)
  • Operates Reliably in Adverse Industrial Environments
    • Hiccup-Mode Current Limit, Sink Current Limit, and Auto-Retry Startup
    • Programmable EN/UVLO Threshold
    • Adjustable Soft-Start
    • -40°C to +125°C Ambient Operating Temperature Range
    • -40°C to +150°C Junction Temperature Range

Applications/Uses

  • Communication Hub in Smart Meters
  • Floating Power Supply Generation
  • Industrial Process Control
  • Isolated Power Supplies in Medical Equipment

Description

The Rainier series of isolated DC-DC products enable small, efficient solutions with a lower BOM. The MAX17687 is a high-voltage, high-efficiency, iso-buck DC-DC converter designed to provide isolated power up to 10W. The device operates over a wide 4.5V to 60V input voltage range and uses primary-side feedback to regulate the output voltage. It delivers primary peak current up to 3.2A and regulates primary output voltage to within ±1.2%.

The device features peak-current-mode control with pulse-width modulation (PWM) scheme. The low-resistance, on-chip MOSFETs ensure high efficiency at full load and simplify the layout.

A programmable soft-start feature allows users to reduce input inrush current. The device also incorporates an output enable/undervoltage lockout pin (EN/UVLO) that allows the user to turn on the part at the desired input-voltage level. An open-drain active-low RESET pin provides a delayed power-good signal to the system upon achieving successful regulation of the primary output voltage.

The device operates from -40°C to +125°C and is available in a compact 20-pin (4mm x 4mm) TQFN package. Simulation models are available.

Simplified Block Diagram

MAX17687: Typical Application Circuit MAX17687: Typical Application Circuit Zoom icon

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 .