DC1189A

DC1189A demonstration circuit is a high efficiency USB power manager with PowerPath™ control and Li-ion/Polymer battery charger featuring the LTC®4088-1. The LTC4088-1 includes a synchronous switching input regulator, a full-featured battery charger and an ideal diode. Designed specifically for USB applications, the LTC4088-1’s switching regulator automatically limits its input current to either 100mA, 500mA or 1A for wall powered applications via logic control. The switching input stage provides power to VOUT where power sharing between the application circuit and the battery charger is managed. Charge current is automatically reduced to maintain a regulated 3.6V VOUT during low battery conditions. As the battery is charged, VOUT tracks VBAT for high efficiency charging. This feature allows the LTC4088-1 to provide more power to the application and eases thermal issues in constrained applications.

• Input voltage range from 4.35V to 5.5V
• Vout: 3.5V to 4.7V (mode and load dependent) and 3.3V: 3.3V (load and VOUT dependent)
• 4.2V output float voltage VBAT (constant voltage mode)
• 0.5A (RPROG equals 2.00kohm) output charge current IBAT (constant current mode)
• A CHRG LED indicates four possible states of the battery charger
• Charging is indicated when the LED is steady-ON
• Not charging is indicated by a steady-OFF
• A NTC fault is indicated by a slow blinking rate (1.5Hz)
• Bad battery is indicated by a fast blinking rate (6.1Hz)
• LTC4088-1 is available in the low profile 14-Lead 4mm x 3mm x 0.75mm DFN surface mount package