MAX77231

2.75V to 4.8V Input, 10mA Output, 35µVRMS Ultra Low Noise and Ripple Boost Regulator

Compact boost with only 35µVRMS ripple and noise


Please check latest availability status for a specific part variant.

Description

The MAX77231 is optimized for boost applications, requiring very low ripple/noise and small PCB space. Output ripple and noise are suppressed to 35µVRMS (in 1MHz BW) by a PMOS linear post-regulator set 0.5V below the boost regulator output to reject noise while optimizing efficiency.

The boost regulator operates using a 1µH/400mA inductor and 2.2µF (0.22 (min) after derating) output capacitance. Fast transient response and stable operation are guaranteed using a current-limited PFM architecture.

A PMOS low-noise linear post-regulator attenuates boost converter ripple by ~50dB (10MHz BW) before delivering 11.2V to the load. Other output voltages up to 16.2V can be factory set. The LDO also disconnects the load from the boost during shutdown, allowing the output to fall to 0V (true shutdown). Active discharge can also be activated.

The MAX77231 is packaged in a 9-bump wafer-level package (WLP), providing a compact layout when combined with the inductor and external capacitors. Total solution size is less than 7mm2.

MAX77231: Block Diagram MAX77231:Block Diagram Enlarge+

Key Features

  • Ultra-Small Solution Size (< 7mm2)
  • 35µVRMS (typ) Output Ripple/Noise
  • 11.2V/10mA Output
  • Output Factory Trimmable from 11.2V to 16.2V
  • 125µA No Load Supply Current Output on < 1µA Shutdown Supply Current
  • True Shutdown Load Disconnect
  • Selectable Active Discharge
  • 9-Bump, 1.238mm x 1.238mm x 0.35mm WLP

Applications/Uses

  • Low-Noise Bias Supply
  • Sensor Bias Supply

See parametric specs for Step-Up Switching Regulators (101)


Part NumberVIN
(V)
VIN
(V)
IOUT1
(A)
Switch TypeOper. Freq.
(kHz)
FeaturesDesign ToolsPackage/PinsBudgetary
Price
minmaxmaxSee Notes
MAX77231 2.74.80.01Internal2000
Current Limit
True Shutdown
EE-Sim
ULTRA THIN WLP/9
$1.22 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX77231EVKIT: Evaluation Kit for the MAX77231

Tools & Models

  • EE-Sim: Design & Simulate MAX77231
  • MAX77231 SIMPLIS Schematic
  • Product Reliability Reports: MAX77231.pdf 
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

     
    Status:
    Package:
    Temperature:

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