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4A, Low-Noise, High-Frequency, Step-Up DC-DC Converter

3V to 5V Step-Up DC-DC, Delivers 4A with Internal Switch

Product Details

Key Features

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 0.7
VIN (V) (max) 5
VOUT1 (V) (min) 2.5
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 4
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
IQ (mA) (typ) 0.2
# DC-DC Outputs 1
Switching Frequency (kHz) 600
Package/Pins SOIC (N)/16
TSSOP/28
Budgetary
Price (See Notes)
5.25
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 0.7
VIN (V) (max) 5
VOUT1 (V) (min) 2.5
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 4
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
IQ (mA) (typ) 0.2
# DC-DC Outputs 1
Switching Frequency (kHz) 600
Package/Pins SOIC (N)/16
TSSOP/28
Budgetary
Price (See Notes)
5.25

Key Features

  • Integration Reduces External Component Count to Save Space
    • On-Chip 10A Power MOSFET
    • 5V, 4A Output from a 3.3V Input
    • Fixed 3.3V or 5V Output Voltage or Adjustable (2.5V to 5.5V)
    • Input Voltage Range Down to 0.7V
  • ConstantFrequencyReducesPost-Filtering
    • Low-Noise, Constant-Frequency Operation (600kHz)
    • Synchronizable Switching Frequency (350kHz to 1000kHz)
  • Lower Power Consumption Extends Battery Life
    • 1mW Quiescent Power

Applications/Uses

  • 3.6V or 5V RF PAs in Communications Handsets
  • Local 2.5V to 3.3V or 5V Conversion
  • Local 3.3V to 5V Conversion
  • Routers, Servers, Workstations, Card Racks

Description

The MAX1709 sets a new standard of space savings for high-power, step-up DC-DC conversion. It delivers up to 20W at a fixed (3.3V or 5V) or adjustable (2.5V to 5.5V) output, using an on-chip power MOSFET from a +0.7V to +5V supply.

Fixed-frequency PWM operation ensures that the switching noise spectrum is constrained to the 600kHz fundamental and its harmonics, allowing easy postfiltering for noise reduction. External clock synchronization capability allows for even tighter noise spectrum control. Quiescent power consumption is less than 1mW to extend operating time in battery-powered systems.

Two control inputs (ONA, active-low ONB) allow simple push-on, push-off control through a single momentary pushbutton switch, as well as conventional on/off logic control. The MAX1709 also features programmable soft-start and current limit for design flexibility and optimum performance with batteries.

The MAX1709 is supplied in both a high-power TSSOP package, which allows a 10ARMS switch current and a 4A output, and a narrow SO package, which supplies a 2.4A output with a switch rated at 6ARMS. Although the narrow SO device has a lower RMS switch rating, it has the same peak switch current rating as the TSSOP device, and so can supply 4A loads intermittently. If loads of 2A or less are required, refer to the MAX1708.

Simplified Block Diagram

MAX1709: Typical Operating Circuit MAX1709: Typical Operating 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 .