Top

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

Compact boost with only 35µVRMS ripple and noise

Product Details

Key Features

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 4.8
IOUT1 (A) (max) 0.01
Switch Type Internal
Preset VOUT (V) 12
Output Adjust. Method Preset
Synchronous Switching? Yes
IQ (mA) (typ) 0.12
Shutdown Mode Supply Current (µA) (typ) 0.01
Shutdown Mode Supply Current (µA) (max) 1
# DC-DC Outputs 1
Switching Frequency (kHz) 2000
Design Tools EE-Sim
Package/Pins ULTRA THIN WLP/9
Budgetary
Price (See Notes)
1.29
View Less

Simplified Block Diagram

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 .

Parameters

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 4.8
IOUT1 (A) (max) 0.01
Switch Type Internal
Preset VOUT (V) 12
Output Adjust. Method Preset
Synchronous Switching? Yes
IQ (mA) (typ) 0.12
Shutdown Mode Supply Current (µA) (typ) 0.01
Shutdown Mode Supply Current (µA) (max) 1
# DC-DC Outputs 1
Switching Frequency (kHz) 2000
Design Tools generateDesignEESIMUrl('http://maxim.transim.com/pwm2/designreq/Index?partId=3824', '')
Package/Pins ULTRA THIN WLP/9
Budgetary
Price (See Notes)
1.29

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

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.

Simplified Block Diagram

MAX77231: Block Diagram MAX77231:Block Diagram 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 .