MAX14627:Low-Power Headset Detectors with SEND/END Button Support

Versatile Jack Detection and Control with High-Performance MIC Bias and Ultra-Low-Power Mode

The MAX14627/MAX14628 provide a simple solution for detecting the insertion and managing the operation of a 3.5mm stereo headset with a microphone. These devices integrate all circuitry needed to detect SEND/END button press events and generate required microphone bias voltages, and are fully compatible with Windows® Mobile 7. The devices need only three GPIOs from the host controller to select between call mode and standby mode, and monitor the SEND/END and jack insertion status. In call mode, the low-noise LDO is enabled to provide DC bias to the externally preamplified microphone. In standby mode, microphone low-power pulsing is enabled to reduce supply current while waiting for a SEND/END button press event. Two open-drain outputs signal the host controller when an insertion/removal or SEND/END button press event occurs. If a 3P headset without a microphone is inserted, the low-power pulsing can be disabled by setting the MODE input to high impedance. The MAX14627 operates from a 2.5V to 5.5V input voltage supply and features an internal 2.2V LDO output, while the MAX14628 operates from a 3.1V to 5.5V voltage supply and features an internal 2.8V LDO output voltage. Both devices control jack insertion detection by monitoring a 3.5mm socket with a normally open jack insertion switch. Additionally, the MAX14628 features open microphone detection. The MAX14627/MAX14628 are available in an 8-pin TDFN package, and are fully specified over the -40°C to +85°C extended temperature range.

Key Features
  • Versatile Jack Detection and Control
    • MODE Three-State Microphone Bias Control
    • MIC Switch Ground Detection (MAX14627)
    • MIC Switch Open and Ground Detection (MAX14628)
  • Compatible with Windows Mobile 7 and Google Android
    • Microphone Button Press Detection
  • High-Performance MIC Bias and Power Savings
    • No Pop-Up Noises
    • Ultra-Low Noise, High-PSRR MIC Bias
    • Low-Power MIC Idle Mode
    • Automatic Ultra-Low-Power Mode When Microphone Is Disabled
  • PCB Space and Cost Savings
    • Integrated ±15kV ESD Protection (HBM) on DETIN and MIC Input Terminals
    • Small 8-Pin (2mm x 2mm) TDFN Package
MAX14627, MAX14628: Typical Operating Circuit
MAX14627, MAX14628: Typical Operating Circuit
Applications/Uses
  • Cell Phones
  • Portable Media Players
  • Tablet/Laptop PCs
DataSheet
titleDownload file
MAX14627-MAX14628 Data SheetMAX14627-MAX14628.pdf
Parametrics
Part NumberVSUPPLY
(V)
Low-Noise LDO Output
(V)
MIC Switch DetectionControl InputsSupply Current for MIC Detection
(µA)
Pop-Up Noise EliminationESD ProtectionPackage/PinsOper. Temp.
(°C)
MAX146272.5 to 5.52.2GroundMIC Mode1.3Plug-in and Plug-out15kV HBM on MIC and DETINTDFN-EP/8-40 to +85
MAX146283.1 to 5.52.8Open and Ground1.9TDFN-EP/8
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX14627ETA+ActiveTDFN-EP,;8 pin;4.4 mm²-40°C to +85°CLead Free
MAX14627ETA+TActiveTDFN-EP,;8 pin;4.4 mm²-40°C to +85°CLead Free
MAX14627-MAX14628.pdf MAX14628
MAX14627.pdf MAX14627
MAX14627-MAX14628.pdf MAX14627