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LTC4065A Datasheet(PDF) 1 Page - Linear Technology

Part # LTC4065A
Description  Standalone 750mA Li-Ion Battery Charger in 2 x 2 DFN
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4065A Datasheet(HTML) 1 Page - Linear Technology

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1
LTC4065/LTC4065A
4065fb
Wireless PDAs
Cellular Phones
Portable Electronics
Standalone 750mA Li-Ion
Battery Charger in 2
× 2 DFN
Complete Linear Charger in 2mm
××××× 2mm DFN
Package
C/10 Charge Current Detection Output
Timer Termination
Charge Current Programmable up to 750mA with
5% Accuracy
No External MOSFET, Sense Resistor or Blocking
Diode Required
Preset 4.2V Float Voltage with 0.6% Accuracy
Constant-Current/Constant-Voltage Operation with
Thermal Feedback to Maximize Charging Rate
Without Risk of Overheating
ACPR Pin Indicates Presence of Input Supply
(LTC4065A Only)
Charge Current Monitor Output for Gas Gauging
Automatic Recharge
Charges Single Cell Li-Ion Batteries Directly from
USB Port
20
µA Supply Current in Shutdown Mode
Soft-Start Limits Inrush Current
Tiny 6-Lead (2mm
× 2mm) DFN Package
FEATURES
DESCRIPTIO
APPLICATIO S
TYPICAL APPLICATIO
+
VCC
R1
510
R2*
1
500mA
R3
2k
4065 TA01
4.2V
Li-Ion
BATTERY
VIN
4.3V TO 5.5V
C1
1
µF
*SERIES 1
Ω RESISTOR ONLY NEEDED FOR INDUCTIVE INPUT SUPPLIES
LTC4065
CHRG
EN
BAT
PROG
GND
The LTC
®4065 is a complete constant-current/constant-
voltage linear charger for single-cell lithium-ion batteries.
Its 2mm
×2mmDFNpackageandlowexternalcomponent
count make the LTC4065 especially well-suited for por-
table applications. Furthermore, LTC4065 is specifically
designed to work within USB power specifications.
The CHRG pin indicates when charge current has dropped
to ten percent of its programmed value (C/10). An internal
timer terminates charging according to battery manufac-
turer specifications.
No external sense resistor or blocking diode is required
due to the internal MOSFET architecture. Thermal feed-
back regulates charge current to limit the die temperature
during high power operation or high ambient temperature
conditions.
When the input supply (wall adapter or USB supply) is
removed, the LTC4065 automatically enters a low current
state, dropping battery drain current to less than 1
µA.With
power applied, LTC4065 can be put into shutdown mode,
reducing the supply current to less than 20
µA.
The full-featured LTC4065 also includes automatic re-
charge, low-battery charge conditioning (trickle charg-
ing), soft-start (to limit inrush current) and an open-drain
status pin to indicate the presence of an adequate input
voltage (LTC4065A only).
The LTC4065 is available in a tiny 6-lead, low profile
(0.75mm) 2mm
× 2mm DFN package.
Standalone Li-Ion Battery Charger
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.


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