Click here to ask about the production status of specific part numbers. MAX38888 2.5V to 5.0V, 0.5A/2.5A Reversible Buck/Boost Regulator for Backup Power Applications General Description Benefits and Features The MAX38888 is a storage capacitor or capacitor bank 2.5V to 5V System Output Voltage backup regulator designed to efficiently transfer power be- 0.8V to 4.5V Cap Voltage Range tween a storage element and a system supply rail in re- Up to 2.5A Peak Inductor Discharge Current versible buck and boost operations using the same induc- Programmable Voltage and Current Thresholds tor. 2% Threshold Accuracy Up to 95% Efficiency, Charge or Discharge When the main supply is present and above the minimum 2.5A Ready Quiescent Current system supply voltage, the regulator operates in buck Small Solution Size mode and charges the storage element at up to 500mA 3mm x 3mm x 0.75mm TDFN Package peak inductor current. Once the storage element is charged, the circuit draws only 2.5A of current while it Ordering Information appears at end of data sheet. maintains the supercapacitor or other storage element in its ready state. When the main supply is removed, the reg- ulator operates in boost mode and prevents the system from dropping below the minimum operating voltage, dis- charging the storage element at up to 2.5A peak inductor current. The MAX38888 is externally programmable for minimum and maximum voltage of the storage element, such as supercapacitor, minimum system voltage, and maximum charge and discharge currents. The internal DC-DC con- verter requires only a 1H inductor. Applications Handheld Industrial Equipment Portable Computers Portable Devices with a Removable Battery 19-100369 Rev 5 8/20MAX38888 2.5V to 5.0V, 0.5A/2.5A Reversible Buck/Boost Regulator for Backup Power Applications Typical Application Circuit CHARGE DISCHARGE 500mA (MAX) 2.5A (MAX) L1 1H VSC VSYS LX 2.7V (MAX) CAP SYS SYSTEM LOAD 1.5V (MIN) 3V (MIN) C2 10F R3 R7 R8 R6 C1 MAIN SUPERCAP 1.8M 1M 1M 2.49M BATTERY MAX38888MAX38888 22F 22F (REMOVABLE) FBCL R2 FBS 402k BACKUP BKUPB FBCH RDY READY ENABLE EN ISET INPUT GND R1 R4 R5 499k 20k 499k www.maximintegrated.com Maxim Integrated 2