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PDF ISL9203 Data sheet ( Hoja de datos )
| Número de pieza | ISL9203 | |
| Descripción | Li-ion/Li Polymer Battery Charger | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
February 3, 2005
ISL9203
FN6106.0
Li-ion/Li Polymer Battery Charger
The ISL9203 is an integrated single-cell Li-ion or Li-polymer
battery charger capable of operating with an input voltage as
low as 2.4V. This charger is designed to work with various
types of ac adapters.
The ISL9203 operates as a linear charger when the ac
adapter is a voltage source. The battery is charged in a
CC/CV (constant current/constant voltage) profile. The
charge current is programmable with an external resistor up
to 1.5A. The ISL9203 can also work with a current-limited
adapter to minimize the thermal dissipation, in which case
the ISL9203 combines the benefits of both a linear charger
and a pulse charger.
The ISL9203 features charge current thermal foldback to
guarantee safe operation when the printed circuit board is
space limited for thermal dissipation. Additional features
include preconditioning of an over-discharged battery,
automatic recharge, and thermally enhanced DFN package.
Ordering Information
PART # (NOTE)
TEMP.
PKG. DWG.
RANGE (°C) PACKAGE
#
ISL9203CRZ
-20 to 70 10 Ld 3x3 DFN L10.3x3
ISL9203CRZ-T
10 Ld 3x3 DFN Tape and Reel
NOTE: "Z" Suffix: Intersil Pb-free products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are RoHS compliant and
compatible with both SnPb and Pb-free soldering operations. Intersil
Pb-free products are MSL classified at Pb-free peak reflow
temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
Typical Application Circuit
5V
Input
VIN VBAT
C1 ISL9203
C2
Floating
to Enable
FAULT
STATUS
EN
VSEN
V2P8
IREF
TIME GND
CTIME
C3
RIREF
Features
• Pb-Free Available (RoHS Compliant)
• Complete Charger for Single-Cell Li-ion Batteries
• Very Low Thermal Dissipation
• Integrated Pass Element and Current Sensor
• No External Blocking Diode Required
• 1% Voltage Accuracy
• Programmable Current Limit up to 1.5A
• Charge Current Thermal Foldback
• Accepts Multiple Types of Adapters
• Guaranteed to Operate at 2.65V After Start Up
• Ambient Temperature Range: -20°C to 70°C
• Thermally-Enhanced DFN Packages
Applications
• Handheld Devices including Medical Handhelds
• PDAs, Cell Phones and Smart Phones
• Portable Instruments, MP3 Players
• Self-Charging Battery Packs
• Stand-Alone Chargers
• USB Bus-Powered Chargers
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”
Pinout
ISL9203 (3x3 DFN)
TOP VIEW
VIN 1
FAULT 2
STATUS 3
TIME 4
GND 5
10 VBAT
9 VSEN
8 IREF
7 V2P8
6 EN
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2005. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL9203
Typical Operating Performance The test conditions for the Typical Operating Performance are: VIN = 5V, TA = 25°C,
RIREF = RIMIN = 80kΩ, VBAT = 3.7V, Unless Otherwise Noted. (Continued)
700
650 THERMAL FOLDBACK STARTS
NEAR 100°C
600
550
500
450
400
350
300
250
200
0
20 40 60 80
TEMPERATURE (°C)
100
FIGURE 9. rDS(ON) vs TEMPERATURE AT 3.7V OUTPUT
420
400 500mA CHARGE
CURRENT, RIREF=40kΩ
380
360
340
320
300
280
260
3.0 3.2 3.4 3.6 3.8 4.0
VBAT (V)
FIGURE 10. rDS(ON) vs OUTPUT VOLTAGE USING CURRENT
LIMITED ADAPTERS
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
20 40 60 80 100 120
TEMPERATURE (oC)
FIGURE 11. REVERSE CURRENT vs TEMPERATURE
32
30 EN = GND
28
26
24
22
20
18
16
14
12
10
3.0 3.5 4.0 4.5 5.0 5.5 6.0
VIN (V)
FIGURE 13. INPUT QUIESCENT CURRENT vs INPUT
VOLTAGE WHEN SHUTDOWN
6.5
5
50
45 EN = GND
40
35
30
25
20
15
10
5
0
0 20 40 60 80 100 120
TEMPERATURE (oC)
FIGURE 12. INPUT QUIESCENT CURRENT vs TEMPERATURE
1.10
1.05
1.00
0.95
0.90
BOTH VBAT AND EN
PINS FLOATING
0.85
0.80
4.3 4.6 4.9 5.2 5.5 5.8 6.1 6.4
VIN (V)
FIGURE 14. INPUT QUIESCENT CURRENT vs INPUT
VOLTAGE WHEN NOT SHUTDOWN
FN6106.0
February 3, 2005
5 Page 
ISL9203
When using a current-limited adapter, the thermal situation in
the ISL9203 is totally different. Figure 19 shows the typical
charge curves when a current-limited adapter is employed.
The operation requires the IREF to be programmed higher
than the limited current ILIM of the adapter, as shown in Figure
19. The key difference of the charger operating under such
conditions occurs during the CC mode.
The Block Diagram, Figure 16, aids in understanding the
operation. The current loop consists of the current amplifier
CA and the sense MOSFET QSEN. The current reference IR
is programmed by the IREF pin. The current amplifier CA
regulates the gate of the sense MOSFET QSEN so that the
sensed current ISEN matches the reference current IR. The
main MOSFET QMAIN and the sense MOSFET QSEN form a
current mirror with a ratio of 100,000:1, that is, the output
charge current is 100,000 times IR. In the CC mode, the
current loop tries to increase the charge current by
enhancing the sense MOSFET QSEN, so that the sensed
current matches the reference current. On the other hand,
the adapter current is limited, the actual output current will
never meet what is required by the current reference. As a
result, the current error amplifier CA keeps enhancing the
QSEN as well as the main MOSFET QMAIN, until they are
fully turned on. Therefore, the main MOSFET becomes a
power switch instead of a linear regulation device. The
power dissipation in the CC mode becomes:
PCH = RDS(ON) ⋅ ICHARGE2
(EQ. 2)
where RDS(ON) is the resistance when the main MOSFET is
fully turned on. This power is typically much less than the
peak power in the traditional linear mode.
The worst power dissipation when using a current-limited
adapter typically occurs at the beginning of the CV mode, as
shown in Figure 19. The equation (EQ. 1) applies during the
CV mode. When using a very small PCB whose thermal
impedance is relatively large, it is possible that the internal
temperature can still reach the thermal foldback threshold. In
that case, the IC is thermally protected by lowering the
charge current, as shown by the dotted lines in the charge
current and power curves. Appropriate design of the adapter
can further reduce the peak power dissipation of the
ISL9203. See the Application Information section of the
ISL6292 data sheet (www.intersil.com) for more information.
Figure 20 illustrates the typical signal waveforms for the
linear charger from the power-up to a recharge cycle. More
detailed Applications Information is given below.
Applications Information
Power on Reset (POR)
The ISL9203 resets itself as the input voltage rises above
the POR rising threshold. The V2P8 pin outputs a 2.8V
voltage, the internal oscillator starts to oscillate, the internal
timer is reset, and the charger begins to charge the battery.
The two indication pins, STATUS and FAULT, indicate a
11
LOW and a HIGH logic signal respectively. Figure 20
illustrates the start up of the charger between t0 to t2.
The ISL9203 has a typical rising POR threshold of 3.4V and
a falling POR threshold of 2.4V. The 2.4V falling threshold
guarantees charger operation with a current-limited adapter
to minimize the thermal dissipation.
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 (2.8V
typical) for 15 consecutive cycles of the internal oscillator. If
the battery voltage drops below VMIN during the 15 cycles,
the 15-cycle counter is reset and the charger stays in the
trickle mode. The charger moves to the CC mode after
verifying the battery voltage. As the battery-pack terminal
voltage rises to the final charge voltage VCH, the CV mode
begins. The terminal voltage is regulated at the constant
VCH in the CV mode and the charge current is expected to
decline. After the charge current drops below IMIN (1/10 of
IREF, see End-of-Charge Current for more detail), the
ISL9203 indicates the end-of-charge (EOC) with the
STATUS pin. The charging actually does not terminate until
the internal timer completes its length of TIMEOUT in order
to bring the battery to its full capacity. Signals in a charge
cycle are illustrated in Figure 20 between points t2 to t5.
The following events initiate a new charge cycle:
• POR,
• the battery voltage drops below a recharge threshold
after completing a charge cycle,
• or, the EN pin is toggled from GND to floating.
VIN
V2P8
POR Threshold
Charge Cycle
Charge Cycle
STATUS
FAULT
15 Cycles to
1/8 TIMEOUT
VBAT
ICHARGE
t0 t1 t2 t3
VRECHRG
2.8V VMIN
IMIN
15 Cycles
t4 t5 t6 t7
t8
FIGURE 20. OPERATION WAVEFORMS
Further description of these events are given later in this
data sheet.
FN6106.0
February 3, 2005
11 Page | ||
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| PDF Descargar | [ Datasheet ISL9203.PDF ] | |
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