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PDF ISL9220 Data sheet ( Hoja de datos )
| Número de pieza | ISL9220 | |
| Descripción | Switching Charger | |
| Fabricantes | Intersil | |
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www.DataSheet4U.com
Switching Charger for 1-Cell and 2-Cell Li-ion
Batteries
ISL9220, ISL9220A
The ISL9220, ISL9220A is a cost-effective and versatile
battery charger for 1-cell and 2-cell Li-ion and 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 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- and 2-Cell 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
• Programmable Input Current Limit 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 4mmx4mm 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
ISL9220, ISL9220A
(20 LD TQFN)
TOP VIEW
STAT2 1
EN 2
AGND 3
ISET1 4
ISET2 5
EPAD
(AGND)
15 PGND
14 SW
13 SW
12 VHI
11 VIN
July 2, 2010
FN6936.1
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  
ISL9220, ISL9220A
www.DataSheet4U.com
Electrical Specifications
PARAMETER
Typical specifications are measured at the following conditions: TA = +25°C; For ISL9220,
VIN = 5V; For ISL9220A, VIN = 12V. (Continued)
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNITS
Charger Output Voltage
INPUT CURRENT SENSE AMPLIFIER
VCHG
ISL9220, IOUT = 100mA,
TA = +25°C
ISL9220A, IOUT = 100mA,
TA = +25°C
ISL9220, IOUT = 100mA
ISL9220A, IOUT = 100mA
4.179 4.2 4.221
8.358 8.4 8.442
4.158 4.2 4.242
8.316 8.4 8.484
V
V
V
V
Input Bias Current at CSIP and CSIN, Pin
(Charger Enabled)
IISIP_ON EN = L
- 100 200 μA
Input Current Limit Threshold
IIN_LIM
OUTPUT CURRENT SENSE AMPLIFIER
CSIP-CSIN
88 100 112 mV
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. PGOOD is defined as when VIN and VBAT meet all these conditions: VIN > VPOR, VIN - VBAT > VOS, VIN < VIN(OVP).
7. Limits should be considered typical and are not production tested.
5 FN6936.1
July 2, 2010
5 Page 
ISL9220, ISL9220A
www.DataSheet4U.com
STAT1 and STAT2 are configured to indicate various
charging conditions as given in Table 1.
A fault status is triggered under one of these conditions:
1. VBAT > VOUT_OVP threshold
2. Timeout occurs before the EOC current has been
reached
To exit the fault mode, the input power has to be
recycled, or the EN pin is toggled to HI and back to LO.
Applications Information
Recharge
After a charge cycle completes at a timeout event,
charging is prohibited until the recharge condition
(VBAT < VRECHG) is met, then the charging restarts with
the timer reset to zero.
Inductor and Output Capacitor Selection
To achieve better steady state and transient response,
ISL9220, ISL9220A typically uses a 10μH inductor. The
peak-to-peak inductor current ripple can be expressed in
Equation 9:
Power-On Reset (POR)
The ISL9220, ISL9220A resets itself as the input voltage
rises above the POR rising threshold. The internal
oscillator starts to oscillate, the internal timer is reset,
and the charger begins to charge the battery. The
STAT1/2 pins will indicate the operating condition
according to Table 1.
Trickle Charge
If the battery voltage is below the trickle charge
threshold, the ISL9220, ISL9220A delivers a small
current to charge the battery until the battery voltage
reaches the fast charge threshold value. There are two
trickle charge thresholds. The first threshold, VPCHG1, is
to pre-charge a deeply discharged battery or short
circuit. The second threshold, VPCHG2 is for batteries
discharged to a voltage range from 2.5V to 3V. When
VBAT is below VPCHG1, the ISL9220, ISL9220A operates
as a linear regulator, providing a 50mA constant current
to output. When VBAT reaches VPCHG2, the ISL9220,
ISL9220A starts to operate as a switching charger. The
trickle charge current is programmable by RISET2.
ΔI
=
VBAT
•
⎛
⎜
1
⎝
–
V---V--B--I--AN----T-⎠⎟⎞
-------------------L-----•----f--S--------------------
(EQ. 9)
In Equation 9, usually the typical values can be used but
to have a more conservative estimation, the inductance
should consider the value with worst case tolerance; and
for switching frequency fS, the minimum fS from the
“Electrical Specifications” table on page 3 can be used. A
worst case for charge current ripple is when battery
voltage is half of the input voltage.
To select the inductor, its saturation current rating should
be at least higher than the sum of the maximum output
current and half of the delta calculated from Equation 9.
Another more conservative approach is to select the
inductor with the current rating higher than the peak
current limit.
Another consideration is the inductor DC resistance since
it directly affects the efficiency of the converter. Ideally,
the inductor with the lower DC resistance should be
considered to achieve higher efficiency.
Charge Cycle
A charge cycle consists of three charge modes: trickle
mode, constant current (CC) mode, and constant voltage
(CV) mode. The charge cycle always starts with the
trickle mode until the battery voltage stays above VMIN
(3.0V typical). If the battery voltage stays below VMIN,
the charger stays in the trickle mode. The charger
operates in CC mode after the battery voltage is above
VMIN. As the battery-pack terminal voltage rises to the
final charge voltage, the CV mode operation begins.
Since the battery terminal voltage is regulated at the
constant output voltage in the CV mode, the charge
current begins to drop. After the charge current drops
below the end-of-charge level, which is programmed by
RISET2. The ISL9220, ISL9220A indicates the
end-of-charge (EOC) with STAT1 and STAT2 and
terminates the charge. The following events initiate a
new charge cycle:
• POR
• A new battery being inserted (detected by RTH pin)
• Recovery from an battery over-temperature fault
• The EN pin is toggled from HI-to-LO
Inductor specifications could be different from different
manufacturers so please check with each manufacturer if
additional information is needed.
For the output capacitor, a ceramic capacitor can be used
because of the low ESR values, which helps to minimize
the output voltage ripple. A typical value of 10μF/10V
ceramic capacitor should be enough for most of the
applications and the capacitor should be X5R or X7R.
Board Layout Recommendations
The ISL9220, ISL9220A is a high frequency switching
charger and hence the PCB layout is a very important
design practice to ensure a satisfactory performance.
The power loop is composed of the output inductor L, the
output capacitor COUT, the SW pin and the PGND pin. It
is important to make the power loop as small as possible
and the connecting traces among them should be direct,
short and wide; the same practice should be applied to
the connection of the VIN pin, the input capacitor CIN
and PGND.
The switching node of the converter, the SW pin, and the
traces connected to this node are very noisy, so keep the
voltage feedback trace and other noise sensitive traces
away from these noisy traces.
11 FN6936.1
July 2, 2010
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet ISL9220.PDF ] | |
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