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4A, 2MHz Step-Down Regulator with Integrated Switches

Smallest, Most Efficient, 4A Step-Down Regulator Switches Frequencies Up to 2MHz

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.9
VIN (V) (max) 5.5
VOUT1 (V) (min) 0.6
VOUT1 (V) (max) 4.5
IOUT1 (A) (max) 4
Switch Type Internal
Preset VOUT (V) 1
2
Output Adjust. Method Digital/VID
Dyn. REF In
Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 2000
Design Tools EE-Sim
Package/Pins TQFN/24
Budgetary
Price (See Notes)
5.35
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.9
VIN (V) (max) 5.5
VOUT1 (V) (min) 0.6
VOUT1 (V) (max) 4.5
IOUT1 (A) (max) 4
Switch Type Internal
Preset VOUT (V) 1
2
Output Adjust. Method Digital/VID
Dyn. REF In
Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 2000
Design Tools generateDesignEESIMUrl('http://maxim.transim.com/pwm2/designreq/Index?partId=3172', '')
Package/Pins TQFN/24
Budgetary
Price (See Notes)
5.35

Key Features

  • Internal 31mΩ RDS(ON) High-Side and 24mΩ RDS(ON) Low-Side MOSFETs
  • Continuous 4A Output Current Over Temperature
  • ±1% Output Accuracy Over Load, Line, and Temperature
  • Operates from 2.9V to 5.5V VIN Supply
  • Adjustable Output from 0.6V to (0.9 x VIN)
  • Soft-Start Reduces Inrush Supply Current
  • 500kHz to 2MHz Adjustable Switching Frequency
  • Compatible with Ceramic, Polymer, and Electrolytic Output Capacitors
  • Nine Preset and Adjustable Output Voltages
    • 0.6V, 0.7V, 0.8V, 1.0V, 1.2V, 1.5V, 1.8V, 2.0V, 2.5V, and Adjustable
  • Monotonic Startup for Safe-Start into Prebiased Outputs
  • Selectable Forced PWM or Skip Mode for Light Load Efficiency
  • Overcurrent and Overtemperature Protection
  • Output Current Sink/Source Capable with Cycle-by-Cycle Protection
  • Open-Drain Power-Good Output
  • Lead-Free, 4mm x 4mm, 24-Pin Thin QFN Package

Applications/Uses

  • ASIC/CPU/DSP Core and I/O Voltages
  • Base-Station Power Supplies
  • DDR Power Supplies
  • POLs
  • RAID Control Power Supplies
  • Server Power Supplies
  • Telecom and Networking Power Supplies

Description

The MAX15038 high-efficiency switching regulator delivers up to 4A load current at output voltages from 0.6V to 90% of VIN. The IC operates from 2.9V to 5.5V, making it ideal for on-board point-of-load and postregulation applications. Total output error is less than ±1% over load, line, and temperature ranges.

The MAX15038 features fixed-frequency PWM mode operation with a switching frequency range of 500kHz to 2MHz set by an external resistor. The MAX15038 provides the option of operating in a skip mode to improve light-load efficiency. High-frequency operation allows for an all-ceramic capacitor design. The high operating frequency also allows for small-size external components.

The low-resistance on-chip nMOS switches ensure high efficiency at heavy loads while minimizing critical inductances, making the layout a much simpler task with respect to discrete solutions. Following a simple layout and footprint ensures first-pass success in new designs.

The MAX15038 comes with a high bandwidth (28MHz) voltage-error amplifier. The voltage-mode control architecture and the voltage-error amplifier permit a type III compensation scheme to be utilized to achieve maximum loop bandwidth, up to 20% of the switching frequency. High loop bandwidth provides fast transient response, resulting in less required output capacitance and allowing for all-ceramic-capacitor designs.

The MAX15038 provides two three-state logic inputs to select one of nine preset output voltages. The preset output voltages allow customers to achieve ±1% output-voltage accuracy without using expensive 0.1% resistors. In addition, the output voltage can be set to any customer value by either using two external resistors at the feedback with a 0.6V internal reference or applying an external reference voltage to the REFIN input. The MAX15038 offers programmable soft-start time using one capacitor to reduce input inrush current.

Simplified Block Diagram

MAX15038: Typical Operating Circuit MAX15038: 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 .