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LM3658
Stat2
Stat1
Iset
Ts
BATT
1 PF
Battery
Pack
GND
USB_sel
EN_b
1 PF
1 PF
CHG_IN
4.5V to 6V
USBpwr
4.5V to 6V
+
LM3658
www.ti.com
SNVS328E –MAY 2005–REVISED MARCH 2007
LM3658 Dual Source USB/AC Li Chemistry Charger IC for Portable Applications
Check for Samples: LM3658
1
FEATURES
DESCRIPTION
The LM3658 is a single chip charger IC designed for
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• Integrated Power FETs with Thermal
handheld applications. It can safely charge and
Regulation
maintain a single cell Li-Ion/Polymer battery operating
• Charges from Either an AC Wall Adapter or
from an AC wall adapter or USB power source. Input
USB Power Source with Automatic Source
power source selection of USB/AC is automatic. With
Selection
both power sources present, the AC power source
has priority. Charge current is programmed through
• 50 mA to 1000 mA Charge Currents Using AC
an external resistor when operating from an AC wall
Wall Adapter
adapter allowing charge currents from 50 mA to 1000
• Pin-Selectable USB Charge Currents of 100
mA. When the battery is charged using USB power,
mA or 500 mA
charge currents of 100 mA or 500 mA are pin-
• LDO Mode with 1A of Source Current is
selectable. The termination voltage is controlled to
within ±0.35% of 4.2V.
Automatically Invoked When the Battery is
Absent and the AC Wall Adapter is Connected
The LM3658 requires few external components and
• Continuous Battery Temperature Monitoring
integrates internal power FETs, reverse current
protection and current sensing. The internal power
• Built-in Multiple Safety Timers
FETs are thermally regulated to obtain the most
• Charge Status Indication
efficient charging rate for a given ambient
• Continuous Over-current and Temperature
temperature.
Protection
The LM3658 operates in five modes: pre-qualification
• Near-depleted Battery Pre-conditioning
mode, constant-current mode, constant-voltage
• Sleep Mode with Ultra Low Quiescent Current
mode, top-off mode and maintenance mode.
Additionally, the charger IC operates as a linear
• On-board Kelvin-sensing Achieves ±0.35%
regulator in “LDO mode”, when the AC wall adapter is
Termination Accuracy
connected and no battery is present. Optimal battery
• Maintenance Mode with Automatic Recharge
management is obtained through thermal regulation,
• Thermally Enhanced 3 mm x 3 mm WSON battery temperature measurement and multiple safety
timers. The LM3658 provides two open-drain outputs
Package
for LED status indication or connection to GPIOs.
APPLICATIONS
Typical Application
• Smartphones
• Digital Still Cameras
• PDAs
• Hard Drive and Flash-based MP3 Players
• USB-powered Devices
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2005–2007, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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