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PDF ISL6294A Data sheet ( Hoja de datos )
| Número de pieza | ISL6294A | |
| Descripción | High Input Voltage Charger | |
| Fabricantes | Intersil | |
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NOc1NTo-8nOR8taE8Rc-CEItNOCoTMOuErMMRTDMESeaNIcELthDNaonEDSriDcEhwaDFelwOeSRwtRuE.ipPnNpLtEeoArWrsCt iCElD.ceMEonSEmtIeNG/rTtNsacSt December 11, 2008
ISL6294A
FN6821.2
High Input Voltage Charger
Features
The ISL6294A 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
7.3V, to prevent excessive power dissipation. The 28V rating
eliminates the overvoltage protection circuit required in a low
input voltage charger.
• 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
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.
• 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
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.
• Ambient Temperature Range: -40°C to +85°C
• 8 Ld 2x3 DFN Package
• Pb-Free (RoHS Compliant)
Ordering Information
PART
NUMBER
(Note)
PART
MARKING
TEMP.
RANGE
(°C)
PACKAGE PKG.
(Pb-Free) DWG. #
ISL6294AIRZ-T* 94A
-40 to +85 8 Ld 2x3 DFN L8.2x3
*Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets, molding compounds/die attach
materials, and 100% matte tin plate plus anneal (e3 termination finish,
which is 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.
Applications
• Mobile Phones
• Blue-Tooth Devices
• PDAs
• MP3 Players
• Stand-Alone Chargers
• Other Handheld Devices
Pinout
ISL6294A
(8 LD DFN)
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 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL6294A
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 ISL6294A 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 ISL6294A 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 FN6821.2
December 11, 2008
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ISL6294A.PDF ] | |
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