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Dual-Output 4A, 3MHz, 2.7V–16V Step-Down Switching Regulator

Shrink Your Designs With the Smallest and Fastest Two Regulators in One Package.

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 16
VOUT1 (V) (min) 0.5
VOUT1 (V) (max) 5.8
IOUT1 (A) (max) 4
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 2
Switching Frequency (kHz) 3000
Design Tools EE-Sim
Package/Pins FC2QFN/21
Budgetary
Price (See Notes)
2.82
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 16
VOUT1 (V) (min) 0.5
VOUT1 (V) (max) 5.8
IOUT1 (A) (max) 4
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 2
Switching Frequency (kHz) 3000
Design Tools generateDesignEESIMUrl('http://maxim.transim.com/pwm2/designreq/Index?partId=29591', '')
Package/Pins FC2QFN/21
Budgetary
Price (See Notes)
2.82

Key Features

  • High-Power Density with Low Component Count
    • Dual-Output or Dual-Phase Operation
    • Single-Supply Operation with Integrated LDO for Bias Generation
    • Optional 2.5V to 5.5V External Bias for Higher Efficiency
    • Compact 3.5mm x 4.6mm, 21-Pin, FC2QFN Package
    • Internal Compensation
  • Wide Operating Range
    • 2.7V to 16V Input Voltage Range
    • 0.5V to 5.8V Output Voltage Range
    • 500kHz to 3MHz Configurable Switching Frequency
    • -40°C to +125°C; Junction Temperature Range
    • Three Pin-Strap Programming Pins to Select Different Configurations
    • Independent Enable and Power Good for Each Output
  • Optimized Performance and Efficiency
    • 92.5% Peak Efficiency with VDDH = 12V, VOUT = 1.8V, and fSW = 1MHz
    • Interleaved 180° Out-of-Phase Operation
    • Selectable AMS to Improve Load Transient
    • Selectable DCM to Improve Light Load Efficiency
    • Active Current Balancing for Dual-Phase Operation (MAX20808 only)

Applications/Uses

  • Communications Equipment
  • I/O Pins of an FPGA/DSP/MCU
  • Memory VDDQ
  • Networking Equipment
  • Point-of-Load Voltage Regulators
  • Servers and Storage Equipment
  • μP Chipsets

Description

The MAX20808/MAX20808T is a dual-output, fully integrated, highly efficient, step-down DC-DC switching regulator. The regulator is able to operate from 2.7V to 16V input supplies, and each output can be regulated from 0.5V to 5.8V, delivering up to 4A of load current per output. With the MAX20808, the two outputs can be connected in parallel as a single-output, dual-phase regulator that supports up to 8A load current.

The switching frequency of the device can be configured from 500kHz to 3MHz and provides the capability of optimizing the design in terms of solution size and performance.

The MAX20808/MAX20808T utilizes fixed-frequency, current-mode control with internal compensation. The dual-switching regulators operate 180° out-of-phase. The MAX20808/MAX20808T features a selectable advanced modulation scheme (AMS) to provide improved dynamic load transient performance. The device also features selectable discontinuous current mode (DCM) operation to improve light load efficiency. Operation settings and configurable features can be selected by connecting pin-strap resistors from the PGM_ pins to ground.

The MAX20808/MAX20808T has an internal 1.8V low-dropout (LDO) output to power the gate drives (VCC) and internal circuitry (AVDD). The device also has an optional LDO input pin (LDOIN), allowing connection from a 2.5V to 5.5V bias input supply for optimized efficiency.

The MAX20808/MAX20808T integrates multiple protections including positive and negative overcurrent protection, output overvoltage protection, and overtemperature protection to ensure a robust design.

The MAX20808/MAX20808T is available in a compact 3.5mm x 4.6mm FC2QFN package that supports -40°C to +125°C junction temperature operation. The MAX20808 package has an open top, and MAX20808T package has a closed top.

Simplified Block Diagram

MAX20808: Block Diagram MAX20808: 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 .