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MAX17673, MAX17673A

Integrated 4.5V to 60V Synchronous 1.5A HV Buck and Dual 2.7V to 5.5V, 1A Buck Regulators

Industry's First 60V Capable, Multi-Output PMIC

Product Details

Key Features

Applications/Uses

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 60
VOUT1 (V) (min) 0.9
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 1.5
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 3
Switching Frequency (kHz) 250
2200
Design Tools EE-Sim
Package/Pins TQFN-CU/28
Budgetary
Price (See Notes)
2.92
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 60
VOUT1 (V) (min) 0.9
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 1.5
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 3
Switching Frequency (kHz) 250
2200
Design Tools generateDesignEESIMUrl('http://maxim.transim.com/pwm2/designreq/Index?partId=9913', '')
Package/Pins TQFN-CU/28
Budgetary
Price (See Notes)
2.92

Key Features

  • Reduces External Components and Total Cost
    • Synchronous Operation for High Efficiency
    • Internal Compensation for a Wide Output Voltage Range
    • All-Ceramic Capacitors,Compact Layout
  • Integrates Three DC-DC Regulators
    • Wide 4.5V to 60V Input Voltage Range for the HV Regulator. 2.7V to 5.5V Input Range for LV Regulators.
    • Adjustable 0.9V to 5.5V Output for the HV Regulator and 0.75V up to 4.8V Output for LV Regulators
    • Delivers up to 1.5A Load Current for the HV Regulator and 1A Load Current for LV Regulators
    • Adjustable Switching Frequency: 250KHz to 800KHz for HV Regulator and 1MHz to 4MHz for LV Regulators
    • Programmable LV / HV Switching Frequency Ratio (2, 3, 4, 5, 6, 7, 8)
    • EN/UVLO for HV buck and EN for LV regulators
  • Reduces Power Dissipation
    • 550μA in PFM and 10.2mA in PWM Mode Quiescent Current
    • Peak Efficiency > 92%
    • Auxiliary Bootstrap LDO for Improved Efficiency
    • PFM Mode for High Light-Load Efficiency
    • 7.4µA Shutdown Current
  • Operates Reliably in Adverse Industrial Environments
    • Peak-Current Limit Protection
    • Hiccup Mode Overload Protection
    • Soft-Start Reduces Inrush Current During Startup (Adjustable for HV Regulator)
    • Built-In Output-Voltage Monitoring with POKH, POKA, and POKB
    • Monotonic Startup into Prebiased Load
    • Overtemperature Protection
    • Dynamic Mode Change for On-the-Fly Shift Between PFM and PWM Mode
    • -40°C to +125°C Operating Temperature Range
    • Complies with CISPR22(EN55022) Class B Conducted and Radiated Emissions

Applications/Uses

  • Base Station Power Supplies
  • Distributed Supply Regulation
  • FPGA/CPLD Power Supplies
  • High Voltage Single Board Systems
  • Industrial Control Power Supplies

Description

MAX17673 Samples

MAX17673/MAX17673A power management integrated circuits (PMIC) integrate a 60V high voltage (HV), high efficiency synchronous DC-DC buck regulator and two 5.5V high efficiency synchronous DC-DC buck regulators. All three regulators offer integrated power MOSFETs.

The HV regulator operates from a 4.5V to 60V input voltage range and the LV regulators operate from a 2.7V to 5.5V input voltage range. The HV regulator supports load currents up to 1.5A, and can regulate output voltages from 0.9V to 5.5V. The LV regulators support load currents up to 1A, and can regulate output voltages from 0.75V to 4.8V.

MAX17673/MAX17673A offer independent peak current mode control, hiccup mode overcurrent protection, ENABLE input and Power OK signal in the three regulators. The switching frequency is adjustable between 1MHz and 4MHz in the LV regulators, and the HV regulator can be programmed to run at a fractional switching frequency of the LV regulators. The HV regulator offers an adjustable soft-start function, while the LV regulators present internally fixed soft-start. Users can choose to operate the devices in either pulse frequency modulation (PFM) or forced pulse width modulation (PWM) scheme.

The devices are available in a 28-pin, 5mm x 5mm TQFN package and operates over a -40°C to +125°C temperature range.

Simplified Block Diagram

MAX17673: Typical Application Circuit MAX17673: Typical Application 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 .