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4.5V-60V, 1.7A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Internal Compensation

Industry's Only 60V, 1.7A Internal FET Synchronous Buck Converter

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 60
VOUT1 (V) (min) 0.9
VOUT1 (V) (max) 54
IOUT1 (A) (max) 1.7
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 2200
Design Tools EE-Sim
Package/Pins TQFN-CU/20
Budgetary
Price (See Notes)
2.06
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 60
VOUT1 (V) (min) 0.9
VOUT1 (V) (max) 54
IOUT1 (A) (max) 1.7
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 2200
Design Tools generateDesignEESIMUrl('http://maxim.transim.com/pwm2/designreq/Index?partId=1306', '')
Package/Pins TQFN-CU/20
Budgetary
Price (See Notes)
2.06

Key Features

  • Eliminates External Components and Reduces Total Cost
    • No Schottky-Synchronous Operation for High Efficiency and Reduced Cost
    • Internal Compensation for Stable Operation at Any Output Voltage
    • All-Ceramic Capacitor Solution: Ultra-Compact Layout with as Few as Eight External Components
  • Reduces Number of DC-DC Regulators to Stock
    • Wide 4.5V to 60V Input Voltage Range
    • 0.9V to 90%VIN Output Voltage
    • Delivers Up to 1.7A Over Temperature
    • 100kHz to 2.2MHz Adjustable Frequency with External Synchronization
    • MAX17505S Allows Higher Frequency Of Operation
    • Available in a 20-Pin, 4mm x 4mm TQFN Package
  • Reduces Power Dissipation
    • Peak Efficiency > 90%
    • PFM and DCM Modes for High Light-Load Efficiency
    • Shutdown Current = 2.8µA (typ)
  • Operates Reliably
    • Hiccup-Mode Current Limit and Autoretry Startup
    • Built-In Output-Voltage Monitoring (Open-Drain Active-Low RESET Pin)
    • Resistor-Programmable EN/UVLO Threshold
    • Adjustable Soft-Start and Prebiased Power-Up
    • High Industrial -40°C to +125°C Ambient Operating Temperature Range/-40°C to +150°C Junction Temperature Range

Applications/Uses

  • Base Station Power Supplies
  • Distributed Supply Regulation
  • General-Purpose Point-of-Load
  • High-Voltage Single-Board Systems
  • Industrial Power Supplies
  • Wall Transformer Regulation

Description

The MAX17505/MAX17505S high-efficiency, high-voltage, synchronously rectified step-down converter with dual integrated MOSFETs operates over a 4.5V to 60V input. It delivers up to 1.7A and 0.9V to 90%VIN output voltage. Built-in compensation across the output voltage range eliminates the need for external components. The feedback (FB) regulation accuracy over -40°C to +125°C is ±1.1%. The device is available in a compact (4mm x 4mm) TQFN lead(Pb)-free package with an exposed pad. Simulation models are available.

The device features a peak-current-mode control architecture with a MODE feature that can be used to operate the device in pulse-width modulation (PWM), pulse-frequency modulation (PFM), or discontinuousconduction mode (DCM) control schemes. PWM operation provides constant frequency operation at all loads, and is useful in applications sensitive to switching frequency. PFM operation disables negative inductor current and additionally skips pulses at light loads for high efficiency. DCM features constant frequency operation down to lighter loads than PFM mode, by not skipping pulses but only disabling negative inductor current at light loads. DCM operation offers efficiency performance that lies between PWM and PFM modes. The MAX17505S offers a lower minimum on-time that allows for higher switching frequencies and a smaller solution size.

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 output voltage.

Simplified Block Diagram

MAX17505: Typical Application Circuit MAX17505: Typical Application 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 .