GOLF9122W

Selectable 200mA ~ 500mA USB Li-Ion /Li-Polymer Charger with Battery Protect IC

This IC is a single chip low-current Li-ion/Li-Polymer charger and battery protect IC
suitable for portable devices rechargeable through USB. It incorporates constant-current/constant-voltage charging for single cell Li-ion/Li-Polymer batteries using safe and efficient charging algorithms. It Provides Over-voltage and Under-voltage
battery protection, as well as Over-current limit protection and safety timers that are able to detect fault conditions.

FEATURES
- USB powered
- USB friendly, high efficiency fast charger
- For Single-Cell Li-ion/Li-Polymer Batteries
- With over-current protection and limiting
- Under-voltage and over-voltage protection
- Integrated safety timers for charging ensures full protection against overcharging
- Integrated charge power MOSFET
- Integrated protection cutoff MOSFET(s)
- Optimized charging for 200mAh, 400mAh, and 500mAh battery capacities either hardwired or by an external select switch for universal configurations.
- Minimum external parts required

- End of Discharge Control

- Low Battery Indicator

- ESD Protection

- RFI Protection

- Ability to communicate with the host system
- Stable linear operation
- Optional input for an external Thermistor for thermal sensing and protection
- 2.8 Volts to 4.2 Volts output at rated battery capacity
- Battery charge status LED output drive
- Low standby current, full CMOS technology
- Compact, SOIC16 package or QFN28 package
- Allows direct-to-PCB soldering of Li-Ion/Li-Polymer batteries in compact, space and
  weight-critical electronic product(s) and applications

APPLICATIONS
- MP3 players, Portable Multimedia Loudspeakers
- USB Rechargeable Gadgets
- Hand-held Devices

DESCRIPTION
The GOLF9122W IC is a USB powered single-cell Li-Ion/Li-Polymer charger and battery protect system for a wide range of portable applications. Being a single-chip solution with very few external parts required, it offers OEM's savings in enclosure tooling by eliminating the need for battery compartments and contacts. For the product end-user, it offers the convenience of having a portable device rechargeable through the USB port and savings on battery purchases.

The GOLF9122W IC incorporates a safe algorithm for charging Li-Ion/Li-Polymer batteries. Integrated safety timers ensure full protection against the hazards of overcharging. An optional input is also available for connecting a thermistor in applications requiring additional thermal sensing and protection.