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PDF ISL6292 Data sheet ( Hoja de datos )
| Número de pieza | ISL6292 | |
| Descripción | Li-ion/Li Polymer Battery Charger | |
| Fabricantes | Intersil Corporation | |
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®
Data Sheet
December 2003
ISL6292
FN9105.3
Li-ion/Li Polymer Battery Charger
The ISL6292 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 or a USB port.
The ISL6292 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 2A. The ISL6292 can also work with a current-limited
adapter to minimize the thermal dissipation, in which case
the ISL6292 combines the benefits of both a linear charger
and a pulse charger.
The ISL6292 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, an
NTC thermistor interface for charging the battery in a safe
temperature range, automatic recharge, and thermally
enhanced QFN or DFN packages.
Ordering Information
PART # (NOTE) TEMP. RANGE (oC) PACKAGE
PKG.
DWG. #
ISL6292-1CR3
-20 to 70
10 Ld 3x3 DFN L10.3x3
ISL6292-1CR3-T 10 Ld 3x3 DFN Tape and Reel
ISL6292-2CR3
-20 to 70
10 Ld 3x3 DFN L10.3x3
ISL6292-2CR3-T 10 Ld 3x3 DFN Tape and Reel
ISL6292-1CR4
-20 to 70
16 Ld 4x4 QFN L16.4x4
ISL6292-1CR4-T 16 Ld 4x4 QFN Tape and Reel
ISL6292-2CR4
-20 to 70
16 Ld 4x4 QFN L16.4x4
ISL6292-2CR4-T 16 Ld 4x4 QFN Tape and Reel
ISL6292-1CR5
-20 to 70
16 Ld 5x5 QFN L16.5x5B
ISL6292-1CR5-T 16 Ld 5x5 QFN Tape and Reel
ISL6292-2CR5
-20 to 70
16 Ld 5x5 QFN L16.5x5B
ISL6292-2CR5-T 16 Ld 5x5 QFN Tape and Reel
ISL6292EVAL1 Evaluation Board for the 3x3 DFN Package Part.
ISL6292EVAL2 Evaluation Board for the 4x4 QFN Package Part.
NOTE: " Z " Suffix: Intersil Lead Free products employ special lead
free material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which is compatible with both SnPb
and lead free soldering operations. Intersil Lead Free products are
MSL classified at lead free peak reflow temperatures that meet or
exceed the lead free requirements of IPC/JEDEC J Std-020B.
Add a “Z” to the end of the part # above for lead-free packages, e.g.,
“ISL6292-1CR3Z-T” is the part # for the lead-free ISL6292-1CR3-T.
Features
• 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 2A
• Programmable End-of-Charge Current
• Charge Current Thermal Foldback
• NTC Thermistor Interface for Battery Temperature Monitor
• Accepts Multiple Types of Adapters or USB BUS
Power
• Guaranteed to Operate at 2.65V After Start Up
• Ambient Temperature Range: -20oC to 70oC
• Thermally-Enhanced QFN Packages
• Lead-Free Package Option Available ("Z" suffix)
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”
Pinouts
ISL6292 (16 LEAD QFN)
TOP VIEW
ISL6292 (10 LEAD DFN)
TOP VIEW
VIN
16 15 14 13
FAULT
VIN 1
12 VBAT
STATUS
FAULT 2
STATUS 3
11 TEMP
10 IMIN
TIME
TIME 4
9 IREF
GND
1
2
3
4
5
5678
10 VBAT
9 TEMP
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. 2003. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL6292
Typical Operating Performance The test conditions for the Typical Operating Performance are: VIN = 5V, TA = 25oC,
RIREF = RIMIN = 80kΩ, VBAT = 3.7V, Unless Otherwise Noted (Continued)
700
650
THERMAL FOLDBACK STARTS
NEAR 100oC
600
550
500
450
400
3x3 DFN
350
300 4x4 QFN
250
200
0
20 40 60 80 100 120
TEMPERATURE (oC)
FIGURE 9. rDS(ON) vs TEMPERATURE AT 3.7V OUTPUT
420
500mA CHARGE CURRENT,
400 RIREF = 40kΩ
380
360
3x3 DFN
340
320
4x4 QFN
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
5 Page 
ISL6292
The following events initiate a new charge cycle:
• POR,
• a new battery being inserted (detected by TEMP pin),
• the battery voltage drops below a recharge threshold
after completing a charge cycle,
• recovery from an battery over-temperature fault,
• or, the EN pin is toggled from GND to floating.
Further description of these events are given later in this
data sheet.
Recharge
After a charge cycle completes, charging is prohibited until
the battery voltage drops to a recharge threshold, VRECHRG
(see Electrical Specifications). Then a new charge cycle
starts at point t6 and ends at point t8, as shown in Figure 19.
The safety timer is reset at t6.
Internal Oscillator
The internal oscillator establishes a timing reference. The
oscillation period is programmable with an external timing
capacitor, CTIME, as shown in Typical Applications. The
oscillator charges the timing capacitor to 1.5V and then
discharges it to 0.5V in one period, both with 10µA current.
The period TOSC is:
TOSC = 0.2 ⋅ 106 ⋅ CTIME
( sec onds)
(EQ. 3)
A 1nF capacitor results in a 0.2ms oscillation period. The
accuracy of the period is mainly dependent on the accuracy
of the capacitance and the internal current source.
Total Charge Time
The total charge time for the CC mode and CV mode is
limited to a length of TIMEOUT. A 22-stage binary counter
increments each oscillation period of the internal oscillator to
set the TIMEOUT. The TIMEOUT can be calculated as:
TIMEOUT
=
222 ⋅ TOSC=
14
⋅
-C----T----I--M----E--
1nF
(minutes) (EQ. 4)
A 1nF capacitor leads to 14 minutes of TIMEOUT. For
example, a 15nF capacitor sets the TIMEOUT to be 3.5
hours. The charger has to reach the end-of-charge condition
before the TIMEOUT, otherwise, a TIMEOUT fault is issued.
The TIMEOUT fault latches up the charger. There are two
ways to release such a latch-up: either to recycle the input
power, or toggle the EN pin to disable the charger and then
enable it again.
The trickle mode charge has a time limit of 1/8 TIMEOUT. If
the battery voltage does not reach VMIN within this limit, a
TIMEOUT fault is issued and the charger latches up. The
charger stays in trickle mode for at least 15 cycles of the
internal oscillator and, at most, 1/8 of TIMEOUT, as shown in
Figure 19.
Disabling TIMEOUT Limit
The TIMEOUT limit for the fast charge modes can be
disabled by pulling the TOEN pin to LOW or shorting it to
GND. When this happens, the charger becomes a current-
limited LDO (low-dropout) supply with its voltage regulated
at the final charge voltage VCH and the current limit
determined by the IREF pin. If the LDO load current drops
below the end-of-charge current (refer to End-of-Charge
section), the STATUS pin will indicate.
The trickle charge time limit, however, is not disabled even
when the TOEN pin is pulled to LOW. The charger operates
in the trickle mode at the beginning of a charge cycle even if
the TIMEOUT is disabled. Leaving the TOEN pin floating is
recommended to enable the TIMEOUT. Driving the TOEN
pin above 3.0V is not recommended.
Charge Current Programming
The charge current is programmed by the IREF pin. There
are three ways to program the charge current:
1. driving the IREF pin above 1.3V
2. driving the IREF pin below 0.4V,
3. or using the RIREF as shown in the Typical Applications.
The voltage of IREF is regulated to a 0.8V reference voltage
when not driven by any external source. The charging
current during the constant current mode is 100,000 times
that of the current in the RIREF resistor. Hence, depending
on how IREF pin is used, the charge current is,
500 m A
IREF=
---0---.--8----V-----
RIREF
×
105
(A)
100 m A
VIREF > 1.3V
RIREF
VIREF < 0.4V
(EQ. 5)
The 500mA current is a guaranteed maximum value for
high-power USB port, with the typical value of 450mA. The
100mA current is also a guaranteed maximum value for the
low-power USB port. This design accommodates the USB
power specification.
The internal reference voltage at the IREF pin is capable of
sourcing less than 100µA current. When pulling down the
IREF pin with a logic circuit, the logic circuit needs to be able
to sink at least 100µA current.
When the adapter is current limited, it is recommended that
the reference current be programmed to at least 30% higher
than the adapter current limit (which equals the charge
current). In addition, the charge current should be at least
350mA so that the voltage difference between the VIN and
the VBAT pins is higher than 100mV. The 100mV is the
offset voltage of the input-output voltage comparator shown
in the block diagram.
11
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| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet ISL6292.PDF ] | |
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