Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

LTC4069 Datasheet(PDF) 9 Page - Linear Technology

Part # LTC4069
Description  Standalone 750mA Li-Ion Battery Charger in 2 2 DFN with NTC Thermistor Input
Download  18 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4069 Datasheet(HTML) 9 Page - Linear Technology

Back Button LTC4069 Datasheet HTML 5Page - Linear Technology LTC4069 Datasheet HTML 6Page - Linear Technology LTC4069 Datasheet HTML 7Page - Linear Technology LTC4069 Datasheet HTML 8Page - Linear Technology LTC4069 Datasheet HTML 9Page - Linear Technology LTC4069 Datasheet HTML 10Page - Linear Technology LTC4069 Datasheet HTML 11Page - Linear Technology LTC4069 Datasheet HTML 12Page - Linear Technology LTC4069 Datasheet HTML 13Page - Linear Technology Next Button
Zoom Inzoom in Zoom Outzoom out
 9 / 18 page
background image
LTC4069
9
4069fc
For more information www.linear.com/LTC4069
operaTion
below 4.1V (which corresponds to 80% to 90% battery
capacity), a new charge cycle is initiated and a 2.25 hour
timer begins. This ensures that the battery is kept at, or
near, a fully charged condition and eliminates the need for
periodicchargecycleinitiations.Also,ifthebatteryvoltage
does not exceed the recharge threshold voltage when the
timer ends, the timer resets and a 2.25 hour recharge cycle
begins. The CHRG output assumes a strong pull-down
state during recharge cycles until C/10 is reached when
it transitions to a high impendance state.
Trickle Charge and Defective Battery Detection
At the beginning of a charge cycle, if the battery voltage
is low (below 2.9V), the charger goes into trickle charge,
reducingthechargecurrentto10%ofthefull-scalecurrent.
Ifthelow-batteryvoltagepersistsforonequarterofthetotal
time (1.125 hour), the battery is assumed to be defective,
the charge cycle is terminated and the CHRG pin output
pulses at a frequency of 2Hz with a 75% duty cycle. If for
anyreasonthebatteryvoltagerisesabove2.9V,thecharge
cycle will be restarted. To restart the charge cycle (i.e.,
when the defective battery is replaced with a discharged
battery), simply remove the input voltage and reapply it
or momentarily float the PROG pin and reconnect it.
CHRG Status Output Pin
Thechargestatusindicatorpinhasthreestates:pull-down,
pulse at 2Hz (see Trickle Charge and Defective Battery
Detection and Battery Temperature Monitoring) and high
impedance.Thepull-downstateindicatesthattheLTC4069
is in a charge cycle. A high impedance state indicates that
thechargecurrenthasdroppedbelow10%ofthefull-scale
current or the LTC4069 is disabled. Figure 2 shows the
CHRG status under various conditions.
Charge Current Soft-Start and Soft-Stop
The LTC4069 includes a soft-start circuit to minimize
the inrush current at the start of a charge cycle. When a
charge cycle is initiated, the charge current ramps from
zerotothefull-scalecurrentoveraperiodofapproximately
170µs.Likewise,internalcircuitryslowlyrampsthecharge
current from full-scale to zero when the charger is shut off
or self terminates. This has the effect of minimizing the
transient current load on the power supply during start-up
and charge termination.
Constant-Current/Constant-Voltage/
Constant-Temperature
The LTC4069 uses a unique architecture to charge a
battery in a constant-current, constant-voltage and con-
stant-temperature fashion. Figure 1 shows a Simplified
Block Diagram of the LTC4069. Three of the amplifier
feedback loops shown control the constant-current (CA),
constant-voltage (VA), and constant-temperature (TA)
modes. A fourth amplifier feedback loop (MA) is used to
increase the output impedance of the current source pair,
M1 and M2 (note that M1 is the internal P-channel power
MOSFET). It ensures that the drain current of M1 is exactly
1000 times greater than the drain current of M2.
Amplifiers CA and VA are used in separate feedback loops
toforcethechargerintoconstant-currentorconstant-volt-
age mode, respectively. Diodes D1 and D2 provide priority
to either the constant-current or constant-voltage loop,
whichever is trying to reduce the charge current the most.
The output of the other amplifier saturates low which
effectively removes its loop from the system. When in
constant-currentmode,CAservosthevoltageatthePROG
pin to be precisely 1V. VA servos its inverting input to an
internal reference voltage when in constant-voltage mode
and the internal resistor divider, made up of R1 and R2,
ensures that the battery voltage is maintained at 4.2V.
The PROG pin voltage gives an indication of the charge
current during constant-voltage mode as discussed in
“Programming Charge Current”.
Transconductanceamplifier,TA,limitsthedietemperature
to approximately 115°C when in constant-temperature
mode. Diode D3 ensures that TA does not affect the charge
current when the die temperature is below approximately
115°C.ThePROGpinvoltagecontinuestogiveanindication
of the charge current.


Similar Part No. - LTC4069

ManufacturerPart #DatasheetDescription
logo
Linear Technology
LTC4069 LINER-LTC4069 Datasheet
193Kb / 16P
   Standalone 750mA Li-Ion Battery Charger in 2 횞 2 DFN with NTC Thermistor Input
logo
Linear Integrated Syste...
LTC4069 LINEAR-LTC4069 Datasheet
522Kb / 18P
   Standalone 750mA Li-Ion Battery Charger in 2 2 DFN with NTC Thermistor Input
logo
Linear Technology
LTC4069-4.4 LINER-LTC4069-4.4 Datasheet
196Kb / 16P
   Standalone 750mA Li-Ion Battery Charger in 2 횞 2 DFN with NTC Thermistor Input
LTC4069-4.4 LINER-LTC4069-4.4_15 Datasheet
207Kb / 16P
   Standalone 750mA Li-Ion Battery Charger
logo
Linear Integrated Syste...
LTC4069EDC LINEAR-LTC4069EDC Datasheet
522Kb / 18P
   Standalone 750mA Li-Ion Battery Charger in 2 2 DFN with NTC Thermistor Input
More results

Similar Description - LTC4069

ManufacturerPart #DatasheetDescription
logo
Linear Integrated Syste...
LTC4069EDC LINEAR-LTC4069EDC Datasheet
522Kb / 18P
   Standalone 750mA Li-Ion Battery Charger in 2 2 DFN with NTC Thermistor Input
logo
Linear Technology
LTC4069-4.4 LINER-LTC4069-4.4 Datasheet
196Kb / 16P
   Standalone 750mA Li-Ion Battery Charger in 2 횞 2 DFN with NTC Thermistor Input
LTC4069 LINER-LTC4069 Datasheet
193Kb / 16P
   Standalone 750mA Li-Ion Battery Charger in 2 횞 2 DFN with NTC Thermistor Input
logo
Linear Integrated Syste...
LTC4065LEDC LINEAR-LTC4065LEDC Datasheet
206Kb / 16P
   Standalone 750mA Li-Ion Battery Charger in 2 2 DFN
logo
Linear Technology
LTC4065-4.4 LINER-LTC4065-4.4 Datasheet
189Kb / 16P
   Standalone 750mA Li-Ion Battery Charger in 2 횞 2 DFN
LTC4065 LINER-LTC4065 Datasheet
188Kb / 16P
   Standalone 750mA Li-Ion Battery Charger in 2 x 2 DFN
LTC4065EDC-4.4 LINER-LTC4065EDC-4.4 Datasheet
196Kb / 16P
   Standalone 750mA Li-Ion Battery Charger in 2 x 2 DFN
LTC4065LXEDC LINER-LTC4065LXEDC Datasheet
196Kb / 16P
   Standalone 750mA Li-Ion Battery Charger in 2 x 2 DFN
LTC4065L LINER-LTC4065L Datasheet
173Kb / 16P
   Standalone 250mA Li-Ion Battery Charger in 2 x 2 DFN
LTC4065-4.4 LINER-LTC4065-4.4_15 Datasheet
189Kb / 16P
   Standalone 750mA Li-Ion Battery Charger
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com