MAXIM MAX1898EUB41+

The MAX1898 forms a complete charger for 1-cell Li+ batteries. It includes precision voltage control (±0.75%) to optimize both cell performance and cycle life. Factory-set 4.2V (MAX1898EUB42) and 4.1V (MAX1898EUB41) versions charge all common Li+ chemistries. Externally selectable charge current is sensed internally, eliminating the need for a current-sense resistor. The charger also supplies outputs that indicate charge status (CHG), the presence of input power (EN/OK), and charge-current magnitude (ISET). Other features include a shutdown control input (EN/OK), selectable threshold for charge-cycle restart without cycling input power (RSTRT), and a selectable charge termination safety timer.

• With an external PNP or PMOS transistor, forms a complete charger for 1-cell lithium-ion (Li+) batteries
• Provides accurate constant-current/constant-voltage charging
• Battery regulation voltage accuracy is ±0.75% for optimum battery performance and cycle life
• Charging current is user set, and is sensed internally so no external current-sense resistor is needed
• Provides outputs to monitor charge status, presence-of-input power source, and charge current
• Additional features include shutdown, optional charge-cycle restart without input-power cycling, selectable charge termination safety timer, and low-current preconditioning for deeply discharged cells
• Offers the maximum integration and functionality in the smallest, most basic application circuit possible
• Very few external components are required
• Offers two versions to safely charge all Li+ battery chemistries. The battery regulation voltage is 4.2V for the MAX1898EUB42 and 4.1V for the MAX1898EUB41
• Both are available in a 10-pin ultrathin µMAX package

• Single-Cell Li+ Powered Portables
• Self-Charging Battery Packs
• PDAs
• Cell Phones
• Cradle Chargers