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PDF ISL6297 Data sheet ( Hoja de datos )
| Número de pieza | ISL6297 | |
| Descripción | Li-ion/Li Polymer Battery Charger | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Data Sheet
March 20, 2007
ISL6297
FN9215.1
Li-ion/Li Polymer Battery Charger
The ISL6297 is a Dual-Mode Lithium Ion battery charger
optimized for cellular phone travel charger applications. It
uses Intersil’s patent-pending dual-mode charge
technology to minimize the heat normally generated in a
linear charger. By minimizing the heat generation, the
ISL6297 can be placed inside the connector of the travel
charger to completely remove the influence of the adapter
cable on the charging performance.
The ISL6297 is an enhancement of the original ISL6292B.
New features include improved accuracy, pre-charge circuit
verification, and enhanced LED indicator function.
Working with a current-limited AC/DC converter, the dual-
mode charger charges a Li-ion battery with the same current
profile as a traditional linear charger. The constant charge
current is determined by the current limit of the AC/DC
converter. The constant output voltage is fixed at 4.2V. When
the battery voltage is below 2.8V, the charger preconditions
the battery with a low trickle-charge current. The charge
status is indicated by a bi-color LED. A safety timer prevents
charging a dead battery for an excessively long period.
The ISL6297 also features THERMAGUARD™, a thermal
foldback function that automatically reduces the charge
current when the internal die temperature exceeds a +100°C
limit to prevent further temperature rise. This function
removes the concern of thermal failure in the targeted
space-limited applications. An ambient temperature
monitoring circuit allows users to set two separate
temperature limit levels, for charge and non-charge
conditions. The thermally-enhanced QFN package further
improves the thermal performance of the ISL6297 in space-
limited applications.
Pinout
ISL6297
(16 LD QFN)
TOP VIEW
16 15 14 13
VIN 1
GRN 2
RED 3
TIME 4
12 VSEN
11 TEMP
10 IMIN
9 IREF
5678
Features
• Complete Charger for Single-Cell Li-ion Batteries
• Integrated Pass Element and Current Sensor
• No External Blocking Diode Required
• Very Low Thermal Dual-Mode Operation
• 0.7% Voltage Accuracy with Remote Sense
• Pre-charge circuit verification with LED status indication
• Drives a bi-color LED
• Programmable Safety Timer
• Programmable Current Limit up to 1.5A
• Programmable End-of-Charge Current
• THERMAGUARD™ Charge Current Thermal Foldback
• NTC Thermistor Interface for Battery Temperature Monitor
• Two-Level Ambient Temperature Setting
• Guaranteed to Operate at 2.65V After Start-Up
• Ambient Temperature Range: -20°C to +70°C
• Thermally-Enhanced QFN Packages
• QFN Package:
- Compliant to JEDEC PUB95 MO-220
QFN - Quad Flat No Leads - Package Outline
- Near Chip Scale Package footprint, which improves
PCB efficiency and has a thinner profile
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• PDAs, Cell Phones and Smart Phones
• Portable Instruments, MP3 Players
• Medical Handhelds
• Self-Charging Battery Packs
• Stand-Alone Chargers
Ordering Information
PART
NUMBER
PART
TEMP.
PKG.
MARKING RANGE (°C) PACKAGE DWG. #
ISL6297CR* ISL 6297CR -20 to +70 16 Ld 4x4 QFN L16.4x4
ISL6297CRZ* 62 97CRZ
(Note)
-20 to +70 16 Ld 4x4 QFN L16.4x4
(Pb-free)
Add “-T” suffix for tape and reel.
NOTE: Intersil Pb-free plus anneal 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.
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.
Thermaguard is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005-2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
Block Diagram
ISL6297
VIN
CR1IN
C1
IREF
RIREF
IMIN
RIMIN
TEMP
DT
Q MAIN
Temperature
Monitoring
IT
IR
Current
References
IMIN
QSEN
100000:1
Current
Mirror
ISEN
References
Input_OK
+
VIN
+
-CA
CHRG
- VPOR
++
50mV
-
V+
A-
VCH
Trickle/Fast
ISEN
+
- MIN_I
V2P9
NTC
Interface
Under Temp
Over Temp
LOGIC
+
Minbat -
VMIN
VRECHRG
+
-
Recharge
Batcon
+
- VCONVER
BAT
V2P9
VSEN
RED
TIME
GND
OSC
COUNTER
Input_OK
GRN
EN
5 FN9215.1
March 20, 2007
5 Page 
ISL6297
VIN
V2P9
EN
DT
Impedance
POR Threshold
500ms
Charge Cycle
Charge Cycle
RED
GRN
15 cycles to 1/8 TIMEOUT
VSEN
2.8V min.
Recharge
15 cycles
ICHG
IMIN
TIMEOUT
IMIN
FIGURE 6. OPERATION WAVEFORMS
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. 6)
A 15nF capacitor results in a 3ms oscillation period. The
accuracy of the period is mainly dependent on the accuracy
of the capacitance and the internal current source.
Total Charge Time and CTIME Selection
The time allowed for the battery to charge before an end of
charge indication is limited to the duration of the TIMEOUT
counter. The TIMEOUT period can be calculated by:
TIMEOUT=
14 × -C----T----I--M----E--
1nF
(minutes)
(EQ. 7)
where CTIME is the timing capacitor shown in the Typical
Application circuit. A 1nF capacitor leads to 14 minutes of
TIMEOUT. For example, a 15nF capacitor sets the
TIMEOUT to be 3.5 hours. The EOC indication goes active
when the TIMEOUT counter expires, even if the battery has
not reached full charge. At this point, if the voltage is above
4.05V, the recharge mechanism will continue to charge the
cell until the current drops below IMIN. If the TIMEOUT
counter expires before the battery reaches 4.05V, then the
end of charge indication goes active, but the charger turns
off. The charger cannot leave this condition without toggling
the enable pin or cycling the power.
The trickle mode charge has a time limit of 1/8 TIMEOUT. If
the battery voltage does not reach VMIN within that time
period, a TIMEOUT fault is issued and the charger turns off
with a flashing Yellow LED indicator. The charger stays in
trickle mode for at least 15 cycles of the internal oscillator
and, at most, 1/8 of TIMEOUT.
Once the ISL6297 detects that the battery reaches the EOC
condition, it resets the TIMEOUT counter. At the end of this
TIMEOUT period, the charger turns off and does not start
again until the battery reaches a recharge condition.
Recharge Threshold
Once the charger reaches an end of charge condition and
the charger turns off, if the battery voltage drops below the
recharge threshold given in the Electrical Specification table,
the charger starts a re-charge cycle. This is identical to an
inital charge cycle, except the indicator remains green.
LED Indications
The LED indicators show a number of conditions. On initial
power on reset, the LEDs sequence through red, green and
yellow. Once the charge begins, the ISL6297 pulls the RED
pin low to drive a red indicator. Once the charge properly
11 FN9215.1
March 20, 2007
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ISL6297.PDF ] | |
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