MAX1898EUB42+T

MAX1898EUB42+T is a linear charger with an external PNP or PMOS transistor, that forms a complete charger for 1-cell lithium-ion (Li+) batteries. It provides accurate constant-current/constant-voltage charging. Battery regulation voltage accuracy is ±0.75% for optimum battery performance and cycle life. The charging current is user-set but is sensed internally so no external current-sense resistor is needed. It also 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. It offers the maximum integration and functionality in the smallest, most basic application circuit possible. The application includes single-cell Li+ powered portables, self-charging battery packs, PDAs, cell phones, and cradle chargers.

• Simple, safe linear charger
• Uses low-cost PNP or PMOS pass element
• Internal current-sense resistor, programmable charging current
• Automatic input power-source detection
• LED charge status indicator, programmable safety timer
• Current-sense monitor output, optional/adjustable auto-restart
• Supply voltage range from 4.5V to 12V (VIN = 8V, VBATT = 4V, EN/OK = open, TA = +25°C)
• 51dB typical voltage-loop gain (∆VDRV/∆VBATT, VIN = 8V, VBATT = 4V, EN/OK = open, TA = +25°C)
• Maximum voltage range from 3.5V to 7V (VIN = 8V, VBATT = 4V, EN/OK = open, TA = +25°C)
• 10 µMAX package, operating temperature range from -40°C to +85°C

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