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3.5V–36V, 3.5A, Synchronous Buck Converter With 28μA Quiescent Current and Reduced EMI

Extend Battery Life with Low Quiescent Current and Synchronous Conversion

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3.5
VIN (V) (max) 42
VOUT1 (V) (min) 1
VOUT1 (V) (max) 10
IOUT1 (A) (max) 3.5
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 200
2200
Design Tools EE-Sim
Package/Pins TQFN-CU/16
Budgetary
Price (See Notes)
2.89
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3.5
VIN (V) (max) 42
VOUT1 (V) (min) 1
VOUT1 (V) (max) 10
IOUT1 (A) (max) 3.5
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 200
2200
Design Tools generateDesignEESIMUrl('http://maxim.transim.com/pwm2/designreq/Index?partId=4725', '')
Package/Pins TQFN-CU/16
Budgetary
Price (See Notes)
2.89

Key Features

  • Eliminates External Components and Reduces Total Cost
    • Integrated High-Side and Low-Side Switch Enables Synchronous Operation for High Efficiency and Reduced Cost
    • All-Ceramic Capacitor Solution Allows Ultra-Compact Solution Size
    • 220kHz to 2.2MHz Adjustable Frequency with External Synchronization
    • Power Good Output and High-Voltage EN Input Simplify Power Sequencing
  • Increases Design Flexibility
    • 180° Out-of-Phase Clock Output at SYNCOUT Enables Cascaded Power Supplies for Increased Power Output
    • Fixed Output Voltage with ±2% Accuracy (5V/3.3V) or Externally Resistor Adjustable (1V to 10V)
  • Reduces Power Dissipation
    • >90% Peak Efficiency
    • PWM and PFM Operation Optimizes Conversion Efficiency From Heavy to Light Loads
    • Automatic LX Slew-Rate Adjustment for Optimum Efficiency Across Operating Frequency Range
    • Low 5µA (typ.) Shutdown Current
    • Low 28µA (typ.) Quiescent Current
  • Operates Reliably
    • 42V Input Voltage Transient Protection
    • Fixed 8ms Internal Software Start Reduces Input Inrush Current
    • Cycle-by-Cycle Current limit, Thermal Shutdown with Automatic Recovery
    • Reduced EMI Emission with Spread-Spectrum Control

Applications/Uses

  • Distributed Supply Regulation
  • General-Purpose Point-of-Load
  • Wall Transformer Regulation

Description

The MAX17245 high-efficiency, synchronous step-down DC-DC converter with integrated MOSFETs operates over a 3.5V to 36V input voltage range with 42V input transient protection. The MAX17245 can operate in dropout condition by running at 98% duty cycle. This converter delivers up to 3.5A and generates fixed output voltages of 3.3V/5V, along with the ability to program the output voltage between 1V to 10V.

The MAX17245 uses a current-mode control architecture and can operate in the pulse-width modulation (PWM) or pulse-frequency modulation (PFM) 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. Under light-load applications, the external sync pin FSYNC logic input allows the device to operate in either PFM mode for reduced current consumption or fixed-frequency PWM (forced-PWM) mode to eliminate frequency variation to minimize EMI. Fixed-frequency PWM mode is extremely useful for power supplies designed for RF transceivers where tight emission control is necessary.

This device is available in a compact 16-pin (5mm × 5mm) TQFN package with exposed pad and 16-pin TSSOP. -40°C to +85°C operation.

Simplified Block Diagram

MAX17245: Internal Block Diagram MAX17245: Internal Block Diagram 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 .