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PDF ISL9518 Data sheet ( Hoja de datos )
| Número de pieza | ISL9518 | |
| Descripción | Narrow VDC Regulator/Charger | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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www.DataSheet4U.com
Data Sheet
Narrow VDC Regulator/Charger with
SMBus Interface
The ISL9518, ISL9518A are highly integrated Narrow VDC
system voltage regulators and battery charger controllers.
Operating parameters are programmable over the System
Management Bus (SMBus). The ISL9518, ISL9518A are
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
ISL9518, ISL9518A also include a 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 for enhanced light load
efficiency and AC-adapter boosting prevention. The ISL9518,
ISL9518A can charge two to four series connected
Lithium-ion cells, at up to 8A charge current. The ISL9518
has default settings for 2-cell systems and the ISL9518A has
default settings for 3-cell systems. Integrated MOSFET
drivers and bootstrap diode result in fewer components and
smaller implementation area. Low offset current-sense
amplifiers provide high accuracy.
The ISL9518, ISL9518A provide two open drain digital
outputs that indicate the presence of the AC adapter and
trickle charge state. Trickle charge state and AC adapter
present indicators are also available via SMBus. The
ISL9518, ISL9518A also provide two analog outputs that
indicate the adapter current and battery discharge current
with 4% accuracy.
Pinout
ISL9518, ISL9518A
(28 LD TQFN)
TOP VIEW
28 27 26 25 24 23 22
SGATE 1
21 LGATE
DCIN 2
20 VDDP
ADET 3
19 VDD
VREF 4
18 CSOP
ICOMP 5
17 CSON
AGND 6
16 BGATE
VCOMP 7
15 AGND
8 9 10 11 12 13 14
ISL9518, ISL9518A
December 8, 2008
FN6775.0
Features
• ±0.5% System Voltage Accuracy (-10°C to +100°C)
• ±3% Accurate Input Current Limit
• ±3% Accurate Battery Charge Current Limit
• Switching Frequency can be Reduced via SMBus for
Higher Efficiency at Light Load Conditions
• Trickle Charge System for Deeply Discharged Batteries
- Automatic Trickle Charge Current (256mA)
- Holds Minimum Voltage to System
• SMBus 2-Wire Serial Interface
• Battery Short Circuit Protection
• Fast System-Load Transient Response
• Monitor Outputs
- Adapter Current (2.5% Accuracy)
- Trickle Charge Mode Indicator
- AC-Adapter Present Indicator
• 11-Bit Max System Voltage Setting
• 7-Bit Min System Voltage Setting
• 6-Bit Charge Current Setting
• 6-Bit Adapter Current Setting
• Over 8A Battery Charger Current
• Over 8A Maximum Adapter Current
• +8V to +22V Adapter Voltage Range
• Pb-Free (RoHS Compliant)
Applications
• Notebook Computers
• Tablet PCs
• Portable Equipment with Rechargeable Batteries
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL9518, ISL9518A
Electrical Specifications
www.DataSheet4U.com
DCIN = CSIP = CSIN = 19V, CSOP = CSON = 12V, VDDP = 5V, VSMB = 3.42V, BOOT-PHASE = 5.0V,
AGND = PGND = 0V, CVDD = 1µF, TA = -10°C to +100°C; Parameters with MIN and/or MAX limits are 100%
tested at +25°C, unless otherwise specified. Temperature limits established by characterization and are not
production tested. (Continued)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
INPUT CURRENT REGULATION
Input Current Accuracy
RS1 = 20mΩ (see Figure 2)
Adapter Current = 512mA
-7 7 %
RS1 = 20mΩ (see Figure 2)
Adapter Current = 4096mA or 8064mA
-3 3 %
CSIP/CSIN Input Voltage Range
5 26 V
ACMON Accuracy
Ideal ACMON = 20*(CSIP-CSIN)
ACMON Min Output Voltage
ACMON Max Source Current
ACMON Max Sink Current
SUPPLY AND LINEAR REGULATOR
VCSIP-CSIN = 161.28mV, ACMON load < 1µA
VCSIP-CSIN = 81.92mV ACMON load < 1µA
VCSIP-CSIN = 10.24mV, ACMON load < 1µA
VCSIP-CSIN = 5.12mV, ACMON load < 1µA
VCSIP-CSIN = 0.0V, ACMON load < 1µA
VCSIP-CSIN = 161.28mV, VACMON = 0V
VCSIP-CSIN = 0.0V, VACMON = 2V
-2.5
-4
-20
-40
30
25 40
25 40
2.5 %
4%
20 %
40 %
80 mV
60 µA
60 µA
DCIN, Input Voltage Range
8 26 V
DCIN Quiescent Current
VDD Output Voltage
VDD Load Regulation
VDD UVLO Rising
VADAPTER = 8V to 26V, VBATTERY 4V to 16.8V
8.0V < VDCIN < 26V, no load
0 < IVDDP < 30mA
4.975
4.5
2
5.1
35
4.7
5
5.23
80
4.85
mA
V
mV
V
VDD UVLO Hysteresis
350 470 600 mV
VSMB Range
2.7 5.5 V
VSMB UVLO Rising
2.35
2.475
2.6
V
VSMB UVLO Hysteresis
80 100 120 mV
VSMB Quiescent Current
VSMB = SCL = SDA = 3.42V
80 150 µA
VSMB Quiescent Current
VSMB = SCL = SDA = 3.42V, LOW POWER BIT= 1
55 75 µA
V REFERENCE
VREF Output Voltage
ADPR
0 < IVREF < 300µA
3.158 3.2 3.232
V
Sink Current
Leakage Current
TRKLN
VADPR = 0.4V, ADET = 3.7V
VADPR = 5.5V, ADET = 2.7V
28
mA
1 µA
Sink Current
Leakage Current
VCSON-BGATE = 6V
VCSON-BGATE = 4V
27
mA
1 µA
5 FN6775.0
December 8, 2008
5 Page 
ISL9518, ISL9518A
Theory of Operation
Inwtrwowd.uDacttaiSohneet4U.com
The ISL9518 differs from the ISL9518A only in the default
states of the internal registers at power-up. ISL9518 defaults
are for systems with an 8.4V (2-cell) battery and ISL9518A
defaults are for systems with a 12.6V battery (3-cell). Unless
otherwise noted, all specifications and descriptions of
ISL9518 refer to both the ISL9518 and ISL9518A.
A high efficiency synchronous buck converter is used to
control the system voltage up to 19.2V and charging current
up to 8A. The ISL9518 also has input current limiting up to
8.064A (or higher with lower values of sense resistor). The
Input current limit, charge current limit, minimum and
maximum system voltage are set by internal registers written
with SMBus. The ISL9518 “Typical Application Circuit” is
shown in Figure 2.
The ISL9518 charges the battery with constant charge
current, set by the ChargeCurrent register, until the battery
voltage rises to a voltage set by the MaxSystemVoltage
register. The charger will then operate at a constant voltage.
The adapter current is monitored and if the adapter current
rises to the limit set by the InputCurrent register, system
voltage and battery charge current are reduced to limit
adapter current. If battery voltage is below the min system
voltage, the trickle charge system is activated.
The ISL9518 features two voltage regulation loops and two
current regulation loops. The max system voltage loop
controls the voltage at CSON with a precision voltage divider
to the voltage error amplifier GM2. The min system voltage
prevents the system voltage from dropping below a minimum
value even if a deeply discharged battery is inserted that is
below the minimum. The Charge Current regulation loop
limits the battery charging current delivered to the battery to
ensure that it never exceeds the current set by the
ChargeCurrent register. The Input Current regulation loop
limits the current drawn from the AC-adapter to ensure that it
never exceeds the limit set by the InputCurrent register to
prevent adapter overload.
PWM Control
The ISL9518 employs a fixed frequency pulse width
modulator (PWM) with feed forward. The switching
frequency can be reduced with an SMBus command for
improved light load efficiency
AC-adapter Detection
AC-adapter voltage is connected through a resistor divider to
ADET to detect when AC power is available, as shown in
Figure 2. ADPR is an open-drain output and is active low
when ADET is less than Vth,fall, and high Z when ADET is
above Vth,rise. The ADET rising threshold is 3.2V (typ) with
57mV hysteresis. ADET must be above the threshold to
Enable the output voltage.
Current Measurement
ACMON is an output voltage that is proportional to the
adapter current being sensed across CSIP and CSIN. The
output voltage range is 0.1V to 3.2V. The voltage of ACMON
is given by Equation 1:
ACMON = 20 ⋅ IINPUT ⋅ RS1
(EQ. 1)
where IINPUT is the DC current drawn from the AC-adapter.
A capacitor is required at the ACMON output to stabilize the
ACMON amplifier and to minimize switching noise.
VDD Regulator
VDD provides a 5.1V supply voltage from the internal LDO
regulator from DCIN and can deliver up to 30mA of
continuous current. VDD also supplies power to VDDP
through a low pass filter as shown in the “Typical Application
Circuit” in Figure 2. The MOSFET drivers are powered by
VDDP. Bypass VDDP and VDD with a 1µF capacitor.
VSMB Supply
The VSMB input provides power to the SMBus interface.
Connect an external supply to VSMB to keep the SMBus
interface active while the supply to DCIN is removed. When
VSMB is biased, the internal registers are maintained. Bypass
VSMB to AGND with a 0.1µF or greater ceramic capacitor.
SGATE Function
If ADET > 3.2V and VDD > 4.5V and ISOLATE_ADAPTER bit
is 0 (default state) then SGATE will be ON (meaning SGATE
will be driven to ground turning on the inrush limit and the
adapter isolation FETs ON). In all other cases, SGATE is OFF
(meaning the chip will not pull-down SGATE and the off chip
resistor will pull the gates of the in-rush limit and adapter
isolation FETs to their sources, turning them OFF).
BGATE Function
The BGATE pin drives the gate of an external PFET to
control the minimum system voltage. If a battery is
connected that is discharged below the value set in the
MinSystemVoltage register, BGATE controls the system
voltage at the value set in the MinSystemVoltage register.
Trickle Charging
If a battery that is discharged below the value set in the
MinSystemVoltage register is connected to the system, the
trickle charge system is activated. In trickle charge mode,
the charge current is reduced to 256mA. The value in the
ChargeCurrent register is not changed. The BGATE FET is
controlled in a linear mode to regulate the system voltage at
min system voltage and to drop voltage between the min
system voltage and the battery. This state is communicated
to the host system by the trickle bit in the control register and
a low state on the TRKLN pin.
When the battery is charged to the min system voltage, the
BGATE FET becomes fully enhanced and BGATE is pulled
more than 5V below the system voltage. This changes the
11 FN6775.0
December 8, 2008
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet ISL9518.PDF ] | |
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