Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

LTC4056ETS8-4.2 Datasheet(PDF) 7 Page - Linear Technology

Part # LTC4056ETS8-4.2
Description  Linear Li-Ion Charger with Termination in ThinSOT
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4056ETS8-4.2 Datasheet(HTML) 7 Page - Linear Technology

Back Button LTC4056ETS8-4.2 Datasheet HTML 3Page - Linear Technology LTC4056ETS8-4.2 Datasheet HTML 4Page - Linear Technology LTC4056ETS8-4.2 Datasheet HTML 5Page - Linear Technology LTC4056ETS8-4.2 Datasheet HTML 6Page - Linear Technology LTC4056ETS8-4.2 Datasheet HTML 7Page - Linear Technology LTC4056ETS8-4.2 Datasheet HTML 8Page - Linear Technology LTC4056ETS8-4.2 Datasheet HTML 9Page - Linear Technology LTC4056ETS8-4.2 Datasheet HTML 10Page - Linear Technology LTC4056ETS8-4.2 Datasheet HTML 11Page - Linear Technology Next Button
Zoom Inzoom in Zoom Outzoom out
 7 / 16 page
background image
LTC4056-4.2
7
405642f
As the battery accepts charge, its voltage rises. When it
reaches the preset float voltage of 4.2V, a precisely divided
down version of this voltage (1.2V) is compared to the
1.2V internal reference voltage by amplifier VA. If the
battery voltage attempts to exceed 4.2V (1.2V at the input
of amplifier VA), the amplifier will divert current away from
the output driver thus limiting charge current to maintain
4.2V on the battery. This is the constant voltage mode.
An external capacitor on the TIMER/SHDN pin and the
resistance between the PROG pin and ground set the total
charge time. When this time elapses, the charge cycle
terminates and the CHRG pin transitions from a strong
pull-down to a weak 12
µA pull-down. To restart the charge
cycle, simply remove the input voltage and reapply it or
momentarily force the TIMER/SHDN pin to ground. The
charge cycle will also restart if the BAT pin voltage falls
below the recharge threshold (VRECHRG isnominally4.05V).
When VCC is applied, pulling the TIMER/SHDN pin to
ground will manually shut down the charger and reset the
timer. When this pin is released an internal 7
µA current
source pulls the TIMER/SHDN pin above the 0.82V shut-
down threshold to resume charging.
Fault conditions such as overheating of the die or exces-
sive DRIVE pin or PROG pin current are monitored and
limited.
When input power is removed or manual shutdown is
entered, the charger will drain only tiny leakage currents
(<1
µA) from the battery, thus maximizing battery standby
time. With VCC removed the external PNP base is con-
nected to the battery by the charger. In manual shutdown
the base is connected to VCC by the charger.
OPERATIO
The LTC4056 is a linear battery charger controller with a
programmable charge termination timer. Operation can
be understood by referring to the Block Diagram. A charge
cycle begins when VCCrises above the UVLO (undervoltage
lockout) threshold VUVLOI (nominally 4.4V), an external
current programming resistor is connected between the
PROG pin and ground and the TIMER/SHDN pin is allowed
to rise above the shutdown threshold VMSDT (nominally
0.82V).
If the battery voltage is below VTRIKL (2.8V) at the begin-
ning of the charge cycle, the charger goes into trickle
charge mode to bring the cell voltage up to a safe level for
charging at full current. In this mode, an internal current
source provides approximately 2% of the programmed
charge current to the BAT pin. The charger goes into the
full charge constant current mode once the voltage on the
BAT pin rises above VTRIKL + ∆VTRIKL (2.9V).
During full current charging, the collector of the external
PNP provides the charge current. The PNP emitter current
flows through the ISENSE pin and through the internal
110m
Ω current sense resistor. This current is close in
magnitude, but slightly more than the collector current
since it includes base current. Amplifier A1 forces 1V on
the PROG pin. Therefore, a current equal to 1V/RPROG will
flow through the internal 100
Ω resistor. Amplifier CA will
force the same voltage that appears across the 100
resistor to appear across the internal 110m
Ω resistor.
This amplifier ensures that the current flowing out of the
ISENSE pin is equal to 915 times the current flowing out of
the PROG pin. Therefore, neglecting base current, the
charge current will be 915V/RPROG. This region of opera-
tion is referred to as constant current mode.


Similar Part No. - LTC4056ETS8-4.2

ManufacturerPart #DatasheetDescription
logo
Linear Technology
LTC4056-4.2 LINER-LTC4056-4.2_15 Datasheet
213Kb / 16P
   Linear Li-Ion Charger with Termination in ThinSOT
More results

Similar Description - LTC4056ETS8-4.2

ManufacturerPart #DatasheetDescription
logo
Linear Technology
LTC4056-4.2 LINER-LTC4056-4.2_15 Datasheet
213Kb / 16P
   Linear Li-Ion Charger with Termination in ThinSOT
LTC4057-4.2 LINER-LTC4057-4.2_15 Datasheet
154Kb / 12P
   Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT
LTC4057 LINER-LTC4057 Datasheet
149Kb / 12P
   Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT
LTC4054L-4.2 LINER-LTC4054L-4.2 Datasheet
191Kb / 16P
   150mA Standalone Linear Li-Ion Battery Charger in ThinSOT
LTC4054L-4.2 LINER-LTC4054L-4.2_15 Datasheet
220Kb / 16P
   150mA Standalone Linear Li-Ion Battery Charger in ThinSOT
LTC4054X-4.2 LINER-LTC4054X-4.2_15 Datasheet
197Kb / 16P
   Standalone Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT
LTC4054-4.2 LINER-LTC4054-4.2_15 Datasheet
197Kb / 16P
   Standalone Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT
LTC4054X LINER-LTC4054X Datasheet
188Kb / 16P
   Standalone Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT
logo
Eutech Microelectronics...
EUP8054 EUTECH-EUP8054 Datasheet
431Kb / 17P
   Standalone Linear Li-Ion Battery Charger With Thermal Regulation in ThinSOT
logo
SHOUDING Shouding Semic...
SD4054 SHOUDING-SD4054 Datasheet
609Kb / 14P
   600mA Standalone Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT
More results


Html Pages

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


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