MAX17503

4.5V-60V, 2.5A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Internal Compensation

Industry's Only 60V, 2.5A Internal FET Synchronous Buck Converter


Description

The MAX17503 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 2.5A 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 discontinuous-conduction 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 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 output voltage.
MAX17503: Typical Application Circuit MAX17503: Typical Application Circuit Enlarge+

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 2.5A Over Temperature
    • 100kHz to 2.2MHz Adjustable Frequency with External Synchronization
    • 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
    • -40°C to +125°C Operation

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
Part Number VIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Output Adjust. Method IOUT1 (max)
(A)
Switch Type Synchronous Switching Power Good Signal DC-DC Outputs Oper. Freq.
(kHz)
Design Tools Budgetary
Price
min max min max See Notes
MAX17503  4.5 60 0.9 54 Resistor 2.5 Internal Yes Yes 1 2200 EE-Sim $1.99 @1k
See All Step-Down Switching Regulators (316)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX17503EVKITB: Evaluation Kit for the MAX17503
MAX17503EVKITA: Evaluation Kit for the MAX17503

Design Tools

Modeling/Simulation
MAX17503 EE-Sim Simulation

 

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