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PDF ISL6294 Data sheet ( Hoja de datos )
| Número de pieza | ISL6294 | |
| Descripción | High Input Voltage Charger | |
| Fabricantes | Intersil | |
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®
Data Sheet
February 18, 2005
ISL6294
FN9174.0
High Input Voltage Charger
The ISL6294 is a cost-effective, fully integrated high input
voltage single-cell Li-ion battery charger. The charger uses a
CC/CV charge profile required by Li-ion batteries. The
charger accepts an input voltage up to 28V but is disabled
when the input voltage exceeds the OVP threshold, typically
6.8V, to prevent excessive power dissipation. The 28V rating
eliminates the overvoltage protection circuit required in a low
input voltage charger.
The charge current and the end-of-charge (EOC) current are
programmable with external resistors. When the battery
voltage is lower than typically 2.55V, the charger
preconditions the battery with typically 20% of the
programmed charge current. When the charge current
reduces to the programmable EOC current level during the
CV charge phase, an EOC indication is provided by the CHG
pin, which is an open-drain output. An internal thermal
foldback function protects the charger from any thermal
failure.
Two indication pins (PPR and CHG) allow simple interface to
a microprocessor or LEDs. When no adapter is attached or
when disabled, the charger draws less than 1µA leakage
current from the battery.
Ordering Information
PART
NUMBER
TEMP.
RANGE (°C)
PACKAGE
PKG.
DWG. #
ISL6294IRZ (Note)
-40 to 85 8 Ld 2x3 DFN
(Pb-free)
L8.2x3
ISL6294IRZ-T (Note) -40 to 85 8 Ld 2x3 DFN
(Pb-free)
L8.2x3
NOTE: 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.
Features
• Complete Charger for Single-Cell Li-ion/Polymer Batteries
• Integrated Pass Element and Current Sensor
• No External Blocking Diode Required
• Low Component Count and Cost
• 1% Voltage Accuracy
• Programmable Charge Current
• Programmable End-of-Charge Current
• Charge Current Thermal Foldback for Thermal
Protection
• Trickle Charge for Fully Discharged Batteries
• 28V Maximum Voltage for the Power Input
• Power Presence and Charge Indications
• Less Than 1µA Leakage Current off the Battery When No
Input Power Attached or Charger Disabled
• Ambient Temperature Range: -40°C to 85°C
• 2x3 DFN-8 Packages
• Pb-Free Available (RoHS Compliant)
Applications
• Mobile Phones
• Blue-Tooth Devices
• PDAs
• MP3 Players
• Stand-Alone Chargers
• Other Handheld Devices
Pinout
DFN 8 LEAD
TOP VIEW
VIN 1
PPR 2
CHG 3
EN 4
8 BAT
7 IREF
6 IMIN
5 GND
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-352-6832 | 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  
ISL6294
VIN
PPR
POR
EN
GND
PRE
REG
VOS
VREF
VCC
BAT
200K
CHARGE
CONTROL
EN
VREF
VCC
DIE
TEMP
115°C
BAT
CHG
IMIN
FIGURE 3. BLOCK DIAGRAM
IREF
4.2V
IREF
TRICKLE
CC
2.55V
19%IREF
CV
CHARGE
VOLTAGE
CHARGE
CURRENT
IMIN
76%I REF
CHG
CHG
INDICATION
FIGURE 4. TYPICAL CHARGE PROFILE
TIME
Description
The ISL6294 charges a Li-ion battery using a CC/CV profile.
The constant current IREF is set with the external resistor
RIREF (See Figure 1) and the constant voltage is fixed at
4.2V. If the battery voltage is below a typical 2.55V trickle-
charge threshold, the ISL6294 charges the battery with a
trickle current of 19% of IREF until the battery voltage rises
above the trickle charge threshold. Fast charge CC mode is
maintained at the rate determined by programming IREF until
the cell voltage rises to 4.2V. When the battery voltage
reaches 4.2V, the charger enters a CV mode and regulates
the battery voltage at 4.2V to fully charge the battery without
the risk of over charge. Upon reaching an end-of-charge
(EOC) current, the charger indicates the charge completion
with the CHG pin, but the charger continues to output the
4.2V voltage. Figure 4 shows the typical charge waveforms
after the power is on.
The EOC current level IMIN is programmable with the
external resistor RIMIN (See Figure 1). The CHG signal turns
5 FN9174.0
February 18, 2005
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ISL6294.PDF ] | |
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