MAXIM MAX20094ATIA/VY+

The MAX20094/MAX20095 ICs combine a configurable constant-current/constant-voltage (CC/CV) battery charger with a high-efficiency synchronous boost controller to supply critical systems in the event the primary power source is lost. In addition, diagnostic features are available to check battery state-of-health (SOH) and IC functionality. Charging thresholds and the boost output voltage are configurable to support popular battery chemistries and a wide range of cell counts. To support system integration, the ICs have an I2C target port through which configuration and status bits can be accessed.

• Switching frequency of 2.2MHz also helps to reduce system cost by minimizing inductor size
• The ICs also include a precision battery SOH check and have built-in functionality to minimize leakage current out of the backup battery (BUB)
• Minimum 2V Sync Boost with n-Channel FET Control
• Skip Mode Guarantees >50% Efficiency at 1mA
• 3V to 6V CC/CV Battery Charger
• I2C-Settable Charging Current up to 1A
• I2C-Selectable CV Voltage and CC Current Levels
• Gate-Driver Output for p-Channel Load Disconnect
• Backup Battery Switchover-Trigger Signal
• I2C Interface Diagnostics and Control Interface
• Accurate Internal Current Sink for Battery Impedance Measurement
• Analog Readout of Internal Sink Current from Backup Battery
• Remote Sense for BATT_ Voltage Measurement
• 3.5V to 36V VIN (40V Load-Dump Tolerant)
• <1μA Leakage for Pins Connected to the Battery
• -40°C to +125°C Operating Temperature Range
• 28-Pin, Side-Wettable TQFN Package Enables Optical Inspection

• Automotive Telematics Battery Backup
• Single or Multicell Battery-Backup Systems