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LTC4069 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC4069
Description  Standalone 750mA Li-Ion Battery Charger in 2 2 DFN with NTC Thermistor Input
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4069 Datasheet(HTML) 1 Page - Linear Technology

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LTC4069
1
4069fc
For more information www.linear.com/LTC4069
Typical applicaTion
DescripTion
Standalone 750mA Li-Ion
Battery Charger in 2
× 2 DFN
with NTC Thermistor Input
The LTC®4069 is a complete constant-current/con-
stant-voltage linear charger for single-cell lithium-ion
batteries. The 2mm
× 2mm DFN package and low external
componentcountmaketheLTC4069especiallywell-suited
for portable applications. Furthermore, LTC4069 is specif-
ically 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
manufacturer 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 LTC4069 automatically enters a low current
state, dropping battery drain current to less than 1µA. With
power applied, LTC4069 can be put into shutdown mode,
reducing the supply current to less than 20µA.
The LTC4069 also includes automatic recharge, low-bat-
tery charge conditioning (trickle charging), soft-start (to
limit inrush current) and an NTC thermistor input used to
monitor battery temperature.
The LTC4069 is available in a tiny 6-lead, low profile
(0.75mm) 2mm
× 2mm DFN package.
FeaTures
applicaTions
n
Complete Linear Charger in 2mm
× 2mm DFN
Package
n
C/10 Charge Current Detection Output
n
Timer Charge Termination
n
ChargeCurrentProgrammableUpto750mAwith
5% Accuracy
n
NoExternalMOSFET,SenseResistororBlocking
Diode Required
n
NTC Thermistor Input for Temperature Qualified
Charging
n
Preset 4.2V Float Voltage with 0.6% Accuracy
n
Constant-Current/Constant-VoltageOperationwith
Thermal Feedback to Maximize Charge Rate
Without Risk of Overheating
n
Charge Current Monitor Output for Gas Gauging
n
Automatic Recharge
n
Charges Single-Cell Li-Ion Batteries Directly from
USB Port
n
20µA Supply Current in Shutdown Mode
n
Soft-Start Limits Inrush Current
n
Tiny 6-Lead (2mm
× 2mm) DFN Package
n
Wireless PDAs
n
Cellular Phones
n
Portable Electronics
Standalone Li-Ion Battery Charger
+
VCC
R1
510
500mA
RPROG
2k
4069 TA01
4.2V
Li-Ion
BATTERY
VIN
4.3V TO 5.5V
1µF
LTC4069
CHRG
NTC
BAT
PROG
GND
RNOM
100k
RNTC
100k
TIME (HOURS)
0
200
400
600
100
300
500
1
2
3
4
4069 TA01b
3.00
3.50
4.00
4.50
3.25
3.75
4.25
5
0.5
0
1.5
2.5
3.5
4.5
CONSTANT
CURRENT
CONSTANT
VOLTAGE
VCC = 5V
RPROG = 2k
CHRG
TRANSITION
CHARGE
TERMINATION
Complete Charge Cycle (1100mAh Battery)
L
, LT, LTC LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6522118, 6700364.


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