Power
AnalogicTech’s New Charger IC Improves Battery Performance in Today’s Portable Electronics
Advanced Analogic Technologies, Inc. (AnalogicTech) (Nasdaq: AATI), an analog semiconductor company focused on powering innovative solutions in consumer, industrial, and communications markets, today introduced the AAT3698, a single input 1.6A linear charger with 28V input protection and 50mA low dropout (LDO) to manage the charging, sequencing and protection of Lithium (Li)-Ion and Lithium Polymer-powered portable devices. Targeting portable electronic devices including cellular phones, GPS navigation systems, portable media players and general hand-held consumer devices, the AAT3698 incorporates key safety features that adjust for excessive temperature or voltage, up to 28V, to avoid over-charging or other damage to the battery during charging.
“LPart of AnalogicTech’s Battery Manager™ Total Power Management IC™ (TPMIC™) product family, the AAT3698 is a linear battery charger IC developed for single-cell Lithium (Li)-Ion and Li-Polymer batteries. Able to manage input voltage of up to 7V the IC integrates many features to increase design flexibility and facilitate design-in. Among these features are a 5V/50mA LDO that can provide additional power to an external device such as a radio in a wireless-communication product. This regulator is enabled at all times regardless of the status of the charger and is protected by an over-voltage protection (OVP) switch.
The AAT3698 is a small standalone charger solution that requires only 2 resistors and 4 small capacitors to operate and comes in a small, lead-free 14-pin 4 mm x 4 mm thin quad flat no-lead (TQFN) package. The AAT3698 precisely regulates battery voltage for Li-Ion/Polymer battery cells through a low RDS(ON) switch after it has reached 4.2V. The charging current can be set by an external resistor up to 1.6A.
Besides the IC’s built-in OVP circuit that helps prevent damage to the battery and the charging circuitry, other fault conditions are monitored in real time. In case of an over-current, battery over-voltage, short circuit, or over-temperature failure, the device will automatically shut down, thereby protecting the charging device, control system, and the battery under charge. A status monitoring output pin (STAT) is provided to indicate charging activity. This open drain output pin can be used to drive an external LED as a charging indicator. When the battery voltage has reached the constant voltage level, the AAT3698 has two charge termination and recharge modes--- one controlled by the charger (AAT3698-1) and one where charge termination and recharge is managed by the host (AAT3698-2).
Key Features:
* High level of integration with internal:
* Power device
* Reverse current blocking
* Current sensing
* 5V/50mA LDO output
* Programmable fast charge current from 50mA to 1.6A
* Programmable charge termination cur¬rent
* Fast over-voltage protection turn off
* OVP trip threshold: 7.25V (typ)
* Digitally controlled thermal loop regulation
* Emergency thermal shutdown protection