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LTC4059A Datasheet(PDF) 1 Page - Linear Technology

Part # LTC4059A
Description  900mA Linear Li-Ion Battery Chargers with Thermal Regulation in 2 2 DFN
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4059A Datasheet(HTML) 1 Page - Linear Technology

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LTC4059/LTC4059A
1
4059fb
Wireless PDAs
Cellular Phones
Portable Electronics
Wireless Headsets
Digital Cameras
Programmable Charge Current Up to 900mA
Charge Current Monitor Output for Charge
Termination
Constant-Current/Constant-Voltage Operation with
Thermal Regulation to Maximize Charging Rate
Without Risk of Overheating
Constant-Current Source Mode for Charging
Nickel Batteries (LTC4059 Only)
ACPR Pin Indicates Presence of Input Supply
(LTC4059A Only)
No External MOSFET, Sense Resistor or Blocking
Diode Required
Operating Supply Voltage from 3.75V to 8V
Charges Single Cell Li-Ion Batteries Directly from
USB Port
Preset 4.2V Charge Voltage with 0.6% Accuracy
10
µA Supply Current in Shutdown Mode
Tiny 6-Lead (2mm
× 2mm) DFN Package
900mA Linear Li-Ion
Battery Chargers with
Thermal Regulation in 2
× 2 DFN
The LTC
®4059/LTC4059A are constant-current/constant-
voltage linear chargers for single cell lithium-ion batteries.
Their 2mm
× 2mm DFN package and low external compo-
nent count make these chargers especially well suited for
portable applications. Furthermore, they are designed to
work within USB power specifications.
No external sense resistor, MOSFET or blocking diode is
required. Thermal feedback regulates the charge current
to limit the die temperature during high power operation or
high ambient thermal conditions. The charge voltage is
fixed at 4.2V and the charge current is programmable.
When the input supply (wall adapter or USB supply) is
removed, the LTC4059/LTC4059A automatically enter a low
current state, dropping the battery current drain to less than
1
µA. With power applied, they can be put into shutdown
mode, reducing the supply current to 10
µA.
The LTC4059A features an open-drain status pin to indi-
cate the presence of an input voltage. The LTC4059 can be
used as a constant-current source to charge Nickel cells.
Other features include undervoltage lockout protection
and a current monitor pin which can indicate when to
terminate a charge cycle.
The LTC4059/LTC4059A are available in a 6-lead, low
profile (0.75mm) 2mm
× 2mm DFN package.
Complete Charge Cycle (800mAh Battery)
TIME (HOURS)
0
500
600
700
2
4059 TA02
400
300
0.5
1
1.5
2.5
200
100
0
4.0
4.2
4.4
3.8
3.6
3.4
3.2
3.0
CONSTANT
CURRENT
CONSTANT
VOLTAGE
VCC = 5V
RPROG = 2k
TA = 25°C
FEATURES
DESCRIPTIO
APPLICATIO S
TYPICAL APPLICATIO
VCC
LTC4059A
VIN
4.5V TO 8V
EN
GND
BAT
1
µF
2k
50k
4.2V
Li-Ion
BATTERY
600mA
VDD
µP
4059 TA01
ACPR
PROG
+
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6522118.


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