The ISL9520HRTZ-T is a highly integrated narrow VDC system voltage regulator and battery charger controller. Operating parameters are programmable over the System Management Bus (SMBus). The ISL9520HRTZ-T is designed for applications where the system power source is either the battery pack or the output of the regulator/charger. This makes the max voltage to the system equal to the max battery voltage instead of the max adapter voltage. The ISL9520HRTZ-T also includes a patented system to control trickle charging deeply discharged batteries while maintaining system voltage at a user defined minimum. High efficiency is achieved with a DC/DCsynchronous-rectifier buck converter, equipped with diode emulation and variable switching frequency for enhanced light load efficiency and AC-adapter boosting prevention. The ISL9520HRTZ-T can charge two, three, or four series connected Lithium-ion cells, at up to 8A charge current. Default settings for 2-, 3- or 4-cell operation at power-up are selected by an external pin. Integrated MOSFET drivers and bootstrap diode result in fewer components and smaller implementation area. Low offset current-sense amplifiers provide high accuracy.The ISL9520HRTZ-T provides an open drain digital output that indicates the presence of the AC-adapter. The ISL9520HRTZ-T also provides an analog output that indicates the battery discharge current and an output that indicates the adapter current.
Feature
- ±0.5% system voltage accuracy (-10°C to +100°C)
- ±3% accurate input current limit (-10°C to +100°C)
- ±3% accurate battery charge current limit
- Variable switching frequency at light load conditions for higher efficiency
- Fixed frequency operation at higher loads
- Fixed frequency mode can be forced by an external pin
- Trickle charge system for deeply discharged batteries
- Automatic trickle charge current (256mA)
- Holds minimum voltage to system
- SMBus 2-wire serial interface
- Default system voltage values for 2-cell, 3-cell or4-cell operation selected by an external pin
- Adapter in-rush FET control
- Adapter isolation FET control
- Battery short circuit protection
- Fast system-load transient response
- Monitor outputs
- Adapter and battery discharge current
- AC-adapter present indicator
- 11-bit max system voltage setting
- 7-bit min system voltage setting
- 6-bit charge current setting
- Over 8A battery charger current
- 6-bit adapter current setting
- Over 8A adapter current
- +9V to +22V adapter voltage range
- VOUT from 2.5V to 19V in 16mV increments
- High efficiency at loads < 0.5W for Energy Star 2013 and ErP lot 6
- 250mW from adapter with 170mW to the load
- Turbo mode support
- Pulse-by-pulse response to limit adapter current
- BGATE on in Turbo mode
- Pb-Free (RoHS compliant)
