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PDF ISL9220B Data sheet ( Hoja de datos )
| Número de pieza | ISL9220B | |
| Descripción | Switching Charger | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Switching Charger for 1-Cell Li-ion Batteries
ISL9220B
The ISL9220B is a cost-effective and versatile battery
charger for 1-cell Li-Polymer based portable applications.
The device features synchronous PWM technology,
maximizing power efficiency, thus minimizing charge
time and heat. The 1.2MHz switching frequency allows
use of small external inductors and capacitors.
A simple charge current programming method is
provided. External resistors program the fast charge and
end-of-charge currents.
The two status outputs can be used to drive LEDs, or can
be connected to the host processor.
A programmable charge timer provides the ability to
detect defective batteries, and provides a secondary
method of detecting charge termination.
A thermistor interface is provided for battery presence
detection, and for temperature qualified charging
conditions.
Additional features include preconditioning of an
over-discharged battery, automatic recharge, and
thermally enhanced QFN package.
Applications
• PDAs and Smart Phones
• MP3 and Portable Media Players
• Handheld GPS Devices
• Digital Still Cameras
• Industrial Handheld Scanners
Features
• Highly Integrated Battery Charger IC
• Charges 1 Li-ion or Li-Polymer Batteries
• Up to 2A Charge Current
• Synchronous Buck Topology, with Integrated Power
FETs
• 1.2MHz Switching Frequency
• 0.5% Charge Voltage Accuracy
• Input Current Limit Programmable with One External
Resistor
• Thermistor Interface for Battery Detection and
Temperature Qualified Charging
• Two Status Outputs
• Programmable Charge Safety Timer
• Short-Circuit and Thermal Protection
• Small 4x4mm TQFN Package
• -40°C to +85°C Operating Temperature Range
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
• Technical Brief TB379 “Thermal Characterization of
Packaged Semiconductor Devices”
• Technical Brief TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for QFN Packages”
Pin Configuration
ISL9220B
(20 LD TQFN)
TOP VIEW
July 2, 2010
FN7652.1
www.DataSheet.in
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. 2010. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL9220B
Electrical Specifications
PARAMETER
Typical specifications are measured at the following conditions: TA = +25°C;
VVIN = 5V. (Continued)
SYMBOL
TEST CONDITIONS
MIN
MAX
(Note 6) TYP (Note 6) UNITS
OUTPUT CURRENT SENSE AMPLIFIER
Input Bias Current at ISNS Pin,
(Charger Enabled)
IISNS_ON EN = L
- 100 200 μA
Input Bias Current at ISNS Pin,
(Charger Disabled)
IISNS_OFF EN = H
- - 1 μA
Input Bias Current at VBAT Pin,
(Charger Enabled)
IVBAT_ON EN = L
- 75 100 μA
Input Bias Current at VBAT Pin,
(Charger Disabled)
IVBAT_OFF EN = H
- - 1 μA
LOGIC INPUT AND OUTPUTS
EN Pin Logic High
1.3 -
-V
EN Pin Logic Low
- - 0.4 V
STAT1, STAT2 Sink Current when ON
Pin Voltage = 0.4V
10 -
- mA
STAT1, STAT2 Leakage Current when
OFF
Pin Voltage = 4.2V
- - 1 μA
NOTES:
6. 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.
7. PGOOD is defined as when VIN and VBAT meet all these conditions: 1. VIN > VPOR, 2. VIN-VBAT > VOS, 3. VIN < VINOVP.
8. Limits should be considered typical and are not production tested.
www.DataSheet.in
5
FN7652.1
July 2, 2010
5 Page 
ISL9220B
and also be connected to other layers through thermal
vias. More thermal vias and more copper attached to the
exposed pad usually result in better thermal
performance. The exposed pad is big enough for 5 vias,
as shown in Figure 4.
FIFGIGUURREE4.4.
Charging Flow Chart
The charging flow chart is shown in Figure 5. The
charging starts with trickle charge current, the ISL9220B
charges the battery in 50mA. If VBAT reaches VPCHG
before the trickle charge timeout interval, the operation
will move to the CC mode. When the output voltage
reaches the 4.2V final voltage, the operation will move to
CV mode, where the battery is charged at a constant
voltage. If the end-of-charge current is reached before
the timeout interval is elapsed, the operation moves to
charge complete state. The charging is terminated. After
the termination, if the output voltage drops below the
recharge threshold, a recharge starts and the timer is
reset to zero.
In the event that the timeout condition is reached before
the EOC condition is reached, the fault mode is entered.
The fault mode can also be triggered by a VBAT OVP
event. To exit the fault mode, the input power has to be
removed and re-applied, or the EN pin is toggled to HI
and back to LO, then a new cycle starts.
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11
FN7652.1
July 2, 2010
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet ISL9220B.PDF ] | |
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