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Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers

4MHz, Dual Synchronous Regulator Delivers 4A/2A in a Small 5mm × 5mm Package

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.5
VIN (V) (max) 5.5
VOUT1 (V) (min) 0.6
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 4
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
# DC-DC Outputs 2
Switching Frequency (kHz) 4000
Package/Pins TQFN/28
Budgetary
Price (See Notes)
3.74
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.5
VIN (V) (max) 5.5
VOUT1 (V) (min) 0.6
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 4
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
# DC-DC Outputs 2
Switching Frequency (kHz) 4000
Package/Pins TQFN/28
Budgetary
Price (See Notes)
3.74

Key Features

  • 2.5V to 5.5V Input-Voltage Range
  • Dual-Output Synchronous Buck Regulators
  • Integrated Switches for 4A and 2A Output Currents
  • 180° Out-Of-Phase Operation
  • Output Voltage Adjustable from 0.6V to VAVIN
  • Two LDO Controllers
  • Lossless, Cycle-by-Cycle Current Sensing
  • External Compensation for Maximum Flexibility
  • Digital Soft-Start and Soft-Stop for Tracking Applications
  • Digital Soft-Start into a Prebiased Load for Sequencing Applications
  • Sequencing or Coincident/Ratiometric Tracking
  • Programmable Switching Frequency from 500kHz to 4MHz
  • Thermal Shutdown and Hiccup-Mode Short-Circuit Protection
  • 30µA Shutdown Current
  • 100% Maximum Duty Cycle
  • Space-Saving (5mm x 5mm) 28-Pin TQFN Package

Applications/Uses

  • Automotive Multimedia
  • Multivoltage Supplies
  • Networking/Telecom
  • Power-Over-Ethernet (PoE) IP Phones
  • RFID Reader Cards

Description

The MAX15022 is a dual-output, pulse-width-modulated (PWM), step-down DC-DC regulator with dual LDO controllers. The device operates from 2.5V to 5.5V and each output can be adjusted from 0.6V to the input supply (VAVIN). The MAX15022 delivers up to 4A (regulator 1) and 2A (regulator 2) of output current with two LDO controllers that can be used to drive two external PNP transistors to provide two additional outputs. This device offers the ability to adjust the switching frequency from 500kHz to 4MHz and provides the capability of optimizing the design in terms of size and performance.

The MAX15022 utilizes a voltage-mode control scheme with external compensation to provide good noise immunity and maximum flexibility in selecting inductor values and capacitor types. The dual switching regulators operate 180° out-of-phase, thereby reducing the RMS input ripple current and thus the size of the input bypass capacitor significantly.

The MAX15022 offers the ability to track (coincident or ratiometric) or sequence during power-up and power-down operation. When sequencing, it powers up glitch-free into a prebiased output.

Additional features include an internal undervoltage lockout with hysteresis and a digital soft-start/soft-stop for glitch-free power-up and power-down. Protection features include lossless cycle-by-cycle current limit, hiccup-mode output short-circuit protection, and thermal shutdown.

The MAX15022 is available in a space-saving, 5mm x 5mm, 28-pin TQFN-EP package and is specified for operation from -40°C to +125°C temperature range.

Simplified Block Diagram

MAX15022: Typical Operating Circuit MAX15022: 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 .