Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

LTC4064 Datasheet(PDF) 11 Page - Linear Technology

Part # LTC4064
Description  Monolithic Linear Charger for Back-Up Li-Ion Batteries
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4064 Datasheet(HTML) 11 Page - Linear Technology

Back Button LTC4064 Datasheet HTML 7Page - Linear Technology LTC4064 Datasheet HTML 8Page - Linear Technology LTC4064 Datasheet HTML 9Page - Linear Technology LTC4064 Datasheet HTML 10Page - Linear Technology LTC4064 Datasheet HTML 11Page - Linear Technology LTC4064 Datasheet HTML 12Page - Linear Technology LTC4064 Datasheet HTML 13Page - Linear Technology LTC4064 Datasheet HTML 14Page - Linear Technology LTC4064 Datasheet HTML 15Page - Linear Technology Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 16 page
background image
LTC4064
11
4064f
+
+
+
4064 F04
RNTC
10k
RHOT
1%
7/8 VCC
1/2 VCC
3/160 VCC
TOO COLD
TOO HOT
DISABLE NTC
LTC4064
VCC
NTC
Thermistors
The LTC4064 NTC trip points were designed to work with
thermistors whose resistance-temperature characteris-
tics follow Vishay Dale’s “R-T Curve 2”. The Vishay
NTHS0603N02N1002J is an example of such a ther-
mistor. However, Vishay Dale has many thermistor prod-
ucts that follow the “R-T Curve 2” characteristic in a variety
of sizes. Futhermore, any thermistor whose ratio of RCOLD
to RHOT is about 7.0 will also work (Vishay Dale R-T Curve
2 shows a ratio of RCOLD to RHOT of 2.816/0.4086 = 6.9).
NTC Layout Considerations
It is important that the NTC thermistor not be in close
thermal contact with the LTC4064. Because the LTC4064
package can reach temperatures in excess of the 50
°C trip
point, the NTC function can cause a hysteretic oscillation
which turns the charge current on and off according to the
package temperature rather than the battery temperature.
This problem can be eliminated by thermally coupling the
NTC thermistor to the battery and not to the LTC4064.
Furthermore, it is essential that the VCC connection to
RHOT is made according to standard Kelvin sense tech-
niques. Since VCC is a high current path into the LTC4064,
it is essential to minimize voltage drops between the VCC
input pin and the top of RHOT.
APPLICATIO S I FOR ATIO
Figure 4
Figure 3. Microprocessor Interface
4064 F03
400k
2k
3
8
LTC4064
IN
VCC
VDD
OUT
CHRG
V+
µPROCESSOR
full-scale current (C/10), the N-channel MOSFET is turned
off and a 30
µA current source is connected to the CHRG
pin. The IN pin will then be pulled high by the 2k pull-up.
By forcing the OUT pin to a high impedance state, the
current source will pull the pin low through the 400k
resistor. When the internal timer has expired, the CHRG
pin will assume a high impedance state and the 400k
resistor will then pull the pin high to indicate that charging
has terminated.
NTC Thermistor
The battery temperature is measured by placing a negative
temperature coefficient (NTC) thermistor close to the
battery pack. The NTC circuitry is shown in Figure 4. To use
this feature, connect a 10k NTC thermistor between the
NTC pin and ground and a resistor (RHOT) from the NTC pin
to VCC. RHOT should be a 1% resistor with a value equal to
the value of the chosen NTC thermistor at 50
°C (this value
is 4.1k for a Vishay NTHS0603N02N1002J thermistor).
The LTC4064 goes into hold mode when the resistance of
the NTC thermistor drops below 4.1k which should be
approximately 50
°C. The hold mode freezes the timer and
stops the charge cycle until the thermistor indicates a
return to a valid temperature. As the temperature drops,
the resistance of the NTC thermistor rises. The LTC4064
is designed to go into hold mode when the value of the NTC
thermistor increases to seven times the value of RHOT. For
a Vishay NTHS0603N02N1002J thermistor, this value is
28.7k which corresponds to approximately 0
°C. The hot
and cold comparators each have approximately 2
°C of
hysteresis to prevent oscillation about the trip point. The
NTC function can be disabled by grounding the NTC pin.


Similar Part No. - LTC4064

ManufacturerPart #DatasheetDescription
logo
Linear Technology
LTC4064 LINER-LTC4064 Datasheet
176Kb / 16P
   Monolithic Linear Charger for Back-Up Li-Ion Batteries
LTC4064 LINER-LTC4064_15 Datasheet
176Kb / 16P
   Monolithic Linear Charger for Back-Up Li-Ion Batteries
More results

Similar Description - LTC4064

ManufacturerPart #DatasheetDescription
logo
Linear Technology
LTC4064 LINER-LTC4064_15 Datasheet
176Kb / 16P
   Monolithic Linear Charger for Back-Up Li-Ion Batteries
logo
Integrated Device Techn...
ZSPM4551 IDT-ZSPM4551 Datasheet
463Kb / 29P
   High-Efficiency Charger for Li-Ion Batteries
logo
Renesas Technology Corp
ZSPM4551 RENESAS-ZSPM4551 Datasheet
636Kb / 30P
   High-Efficiency Charger for Li-Ion Batteries
January 29, 2016
logo
Integrated Device Techn...
ZSPM4521 IDT-ZSPM4521 Datasheet
470Kb / 30P
   High-Efficiency Charger for Li-Ion Batteries
logo
List of Unclassifed Man...
ZSPM4551 ETC2-ZSPM4551 Datasheet
1Mb / 30P
   High-Efficiency Charger for Li-Ion Batteries
logo
Mean Well Enterprises C...
RCB-1600 MEANWELL-RCB-1600 Datasheet
193Kb / 6P
   CHARGER FOR LEAD-ACID BATTERIES AND LI-ION BATTERIES
logo
Intersil Corporation
ISL9220B INTERSIL-ISL9220B_10 Datasheet
463Kb / 15P
   Switching Charger for 1-Cell Li-ion Batteries
ISL6292BCR INTERSIL-ISL6292BCR Datasheet
293Kb / 12P
   Complete Charger for Single-Cell Li-ion Batteries
April 19, 2005
logo
Shenzhenshi YONGFUKANG ...
TP4055 YONGFUKANG-TP4055 Datasheet
277Kb / 12P
   Linear Li-Ion Battery Charger
logo
E-CMOS Corporation
EXT9502 E-CMOS-EXT9502 Datasheet
1Mb / 6P
   Linear 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