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


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
Part Number VIN
(V)
VIN
(V)
Preset VOUT
(V)
IOUT1
(A)
Output Adjust. Method Switch Type Synchronous Switching ICC
(mA)
Shutdown Mode Supply Current
(µA)
Shutdown Mode Supply Current
(µA)
DC-DC Outputs Oper. Freq.
(kHz)
Design Tools Package/Pins Budgetary
Price
min max max typ typ max See Notes
MAX77231 NEW! 2.7 4.8 12 0.01 Preset Internal Yes 0.12 0.01 1 1 2000 EE-Sim
ULTRA THIN WLP/9
$1.16 @1k
See All Step-Up Switching Regulators (92)
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

Quality and Environmental Data

Product Reliability Reports: MAX77231.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Topmark Coding MAX77231

Tools & Models

Design & Simulate MAX77231

Related Resources


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