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Narrow VDC Regulator/Charger with SMBus Interface
The ISL9519 is a highly integrated Narrow VDC system voltage
regulator and battery charger controller. Operating parameters
are programmable over the System Management Bus (SMBus).
The ISL9519 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 ISL9519 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/DC synchronous-rectifier buck converter,
equipped with diode emulation and variable switching
frequency for enhanced light load efficiency and AC-adapter
boosting prevention. The ISL9519 can charge one, two or three
series connected Lithium-ion cells, at up to 8A charge current.
Default settings for 1-, 2- or 3-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.
• ±0.5% System Voltage Accuracy (-10°C to +100°C)
The ISL9519 provides an open drain digital output that
indicates the presence of the AC-adapter. The ISL9519 also
provides an analog output that indicates the adapter current.
• Fast System-Load Transient Response
Related Literature
• ±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 1-Cell, 2-Cell or
3-Cell Operation Selected by an External Pin
• Adapter In-rush FET Control
• Adapter Isolation FET Control
• Battery Short Circuit Protection
• Monitor Outputs
- Adapter Current (2.5% Accuracy)
- AC-adapter Present Indicator
• See AN1562, “ISL9519EVAL1Z Evaluation Board Setup
Procedure” for applications with adapter voltage > 7V
• 11-Bit Max System Voltage Setting
• See AN1570, “ISL9519EVAL2Z Evaluation Board Setup
Procedure” for applications with adapter voltage > 5V
• 6-Bit Charge Current Setting
- Over 8A Battery Charger Current
• 7-Bit Min System Voltage Setting
• 6-Bit Adapter Current Setting
- Over 8A Adapter Current
• +4.5V to +22V Adapter Voltage Range
• Pb-Free (RoHS Compliant)
• Notebook Computers
• Tablet PCs
• Portable Equipment with Rechargeable Batteries
March 1, 2012
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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March 1, 2012