ISL9519
Narrow VDC Regulator/Charger
with SMBus Interface
Key Features
±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 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
Fast System‐Load Transient Response
Monitor Outputs
Adapter Current (2.5% Accuracy)
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
+4.5V to +22V Adapter Voltage Range
Pb‐Free (RoHS Compliant)
Description
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.
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.
Applications
Notebook Computers
Tablet PCs
Portable Equipment with Rechargeable Batteries
Parameters
V
IN
(min) (V)
V
IN
(max) (V)
Input Current Limit Accuracy (%)
Battery Charge Voltage (V)
Charging Voltage Accuracy Max (%)
Battery Charge Voltage Adjust (%)
Charge Current Limit Accuracy (%)
Trickle Charge Current Limit Accuracy (%)
Automatic Trickle Charge Typ (V)
Battery Leakage Current Max (μA)
Automatic Power Source Selection
Automatic Power Source Selection
Topology
ISL9519
4.5
22
±3
2V to 16.3V in
±0.5
16mV steps
±3
166A to 346mA
4.7
25 (DCIN=0V, No
Yes
Yes
Variable
Electronics Design Contest
京公网安备 11010802033920号
EEWORLD
