Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

LTC4075X Datasheet(PDF) 10 Page - Linear Technology

Part # LTC4075X
Description  Dual Input USB/AC Adapter Standalone Li-Ion Battery Chargers
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4075X Datasheet(HTML) 10 Page - Linear Technology

Back Button LTC4075X_15 Datasheet HTML 6Page - Linear Technology LTC4075X_15 Datasheet HTML 7Page - Linear Technology LTC4075X_15 Datasheet HTML 8Page - Linear Technology LTC4075X_15 Datasheet HTML 9Page - Linear Technology LTC4075X_15 Datasheet HTML 10Page - Linear Technology LTC4075X_15 Datasheet HTML 11Page - Linear Technology LTC4075X_15 Datasheet HTML 12Page - Linear Technology LTC4075X_15 Datasheet HTML 13Page - Linear Technology LTC4075X_15 Datasheet HTML 14Page - Linear Technology Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 16 page
background image
LTC4075/LTC4075X
10
4075Xfa
*Any external sources that hold the ITERM pin above 100mV will prevent the LTC4075 from
terminating a charge cycle.
The termination condition is detected by using an internal
filtered comparator to monitor the ITERM pin. When the
ITERM pin voltage drops below 100mV* for longer than
tTERMINATE (typically 1.5ms), charging is terminated. The
charge current is latched off and the LTC4075 enters
standby mode.
When charging, transient loads on the BAT pin can cause
the ITERM pin to fall below 100mV for short periods of
time before the DC charge current has dropped below the
programmed termination current. The 1.5ms filter time
(tTERMINATE) on the termination comparator ensures that
transient loads of this nature do not result in premature
charge cycle termination. Once the average charge current
drops below the programmed termination threshold, the
LTC4075 terminates the charge cycle and ceases to provide
any current out of the BAT pin. In this state, any load on
the BAT pin must be supplied by the battery.
Low Battery Charge Conditioning (Trickle Charge)
This feature ensures that near-dead batteries are gradually
charged before reapplying full charge current . If the BAT
pin voltage is below 2.9V, the LTC4075 supplies 1/10th
of the full charge current to the battery until the BAT pin
rises back above 2.9V. For example, if the charger is
programmed to charge at 800mA from the wall adapter
input and 500mA from the USB input, the charge current
during trickle charge mode would be 80mA and 50mA,
respectively.
The LTC4075X does not include the trickle charge feature;
it outputs full charge current to the battery when the
BAT pin voltage is below 2.9V. The LTC4075X is useful
in applications where the trickle charge current may be
insufficient to supply the load during low battery voltage
conditions.
Automatic Recharge
In standby mode, the charger sits idle and monitors the
battery voltage using a comparator with a 6ms filter time
(tRECHRG). A charge cycle automatically restarts when the
battery voltage falls below 4.1V (which corresponds to
approximately 80%-90% battery capacity). This ensures
that the battery is kept at, or near, a fully charged condi-
tion and eliminates the need for periodic charge cycle
initiations.
If the battery is removed from the charger, a sawtooth
waveform of approximately 100mV appears at the battery
output. This is caused by the repeated cycling between
termination and recharge events. This cycling results in
pulsing at the
⎯C⎯H⎯R⎯G output; an LED connected to this pin
will exhibit a blinking pattern, indicating to the user that
a battery is not present. The frequency of the sawtooth is
dependent on the amount of output capacitance.
Manual Shutdown
The ENABLE pin has a 2M
Ω pulldown resistor to GND. The
definition of this pin depends on which source is supplying
power. When the wall adapter input is supplying power,
logic low enables the charger and logic high disables it (the
pulldown defaults the charger to the charging state). The
opposite is true when the USB input is supplying power;
logic low disables the charger and logic high enables it
(the default is the shutdown state).
The DCIN input draws 20µA when the charger is in shut-
down. The USBIN input draws 18µA during shutdown if
no power is applied to DCIN, but draws only 10µA when
VDCIN > VUSBIN.
Charge Current Soft-Start and Soft-Stop
The LTC4075 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
zero to full-scale current over a period of 250µs. Likewise,
internal circuitry slowly ramps the charge current from
full-scale to zero in a period of approximately 30µs when
the charger shuts down or self terminates. This minimizes
the transient current load on the power supply during
start-up and shut-off.
Status Indicators
The charge status output (
⎯C⎯H⎯R⎯G)hastwostates:pull-down
and high impedance. The pull-down state indicates that
the LTC4075 is in a charge cycle. Once the charge cycle
has terminated or the LTC4075 is disabled, the pin state
becomes high impedance. The pull-down state is capable
of sinking up to 10mA.
OPERATIO


Similar Part No. - LTC4075X_15

ManufacturerPart #DatasheetDescription
logo
Linear Technology
LTC4075XEDD LINER-LTC4075XEDD Datasheet
188Kb / 16P
   Dual Input USB/AC Adapter Standalone Li-Ion Battery Chargers
More results

Similar Description - LTC4075X_15

ManufacturerPart #DatasheetDescription
logo
Linear Technology
LTC4075 LINER-LTC4075_15 Datasheet
210Kb / 16P
   Dual Input USB/AC Adapter Standalone Li-Ion Battery Chargers
LTC4075 LINER-LTC4075 Datasheet
188Kb / 16P
   Dual Input USB/AC Adapter Standalone Li-Ion Battery Chargers
LTC4096 LINER-LTC4096_15 Datasheet
187Kb / 16P
   Dual Input Standalone Li-Ion Battery Chargers
LTC4096 LINER-LTC4096 Datasheet
182Kb / 16P
   Dual Input Standalone Li-Ion Battery Chargers
logo
Maxim Integrated Produc...
MAX1551EZK MAXIM-MAX1551EZK Datasheet
317Kb / 8P
   SOT23 Dual-Input USB/AC Adapter 1-Cell Li Battery Chargers
Rev 0; 7/03
MAX1551-MAX1555 MAXIM-MAX1551-MAX1555 Datasheet
204Kb / 8P
   SOT23 Dual-Input USB/AC Adapter 1-Cell LiBattery Chargers
Rev 0; 7/03
logo
Linear Technology
LTC4077 LINER-LTC4077 Datasheet
209Kb / 16P
   Dual Input Standalone Li-Ion Battery Charger
LTC4077 LINER-LTC4077_15 Datasheet
424Kb / 16P
   Dual Input Standalone Li-Ion Battery Charger
LTC4076 LINER-LTC4076_15 Datasheet
422Kb / 16P
   Dual Input Standalone Li-Ion Battery Charger
LTC4076 LINER-LTC4076 Datasheet
416Kb / 16P
   Dual Input Standalone Li-Ion Battery Charger
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