Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

LTC4050EMS-4.1 Datasheet(PDF) 10 Page - Linear Technology

Part # LTC4050EMS-4.1
Description  Lithium-Ion Linear Battery Charger with Thermistor Interface
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4050EMS-4.1 Datasheet(HTML) 10 Page - Linear Technology

Back Button LTC4050EMS-4.1 Datasheet HTML 4Page - Linear Technology LTC4050EMS-4.1 Datasheet HTML 5Page - Linear Technology LTC4050EMS-4.1 Datasheet HTML 6Page - Linear Technology LTC4050EMS-4.1 Datasheet HTML 7Page - Linear Technology LTC4050EMS-4.1 Datasheet HTML 8Page - Linear Technology LTC4050EMS-4.1 Datasheet HTML 9Page - Linear Technology LTC4050EMS-4.1 Datasheet HTML 10Page - Linear Technology LTC4050EMS-4.1 Datasheet HTML 11Page - Linear Technology LTC4050EMS-4.1 Datasheet HTML 12Page - Linear Technology  
Zoom Inzoom in Zoom Outzoom out
 10 / 12 page
background image
10
LTC4050
4050f
If a PNP transistor is chosen as the pass transistor, a
1000pF capacitor is required from the DRV pin to VCC. This
capacitor is needed to help stabilize the voltage loop. A
10
µF capacitor at the BAT pin is also recommended when
a battery is not present.
VCC Bypass Capacitor
Many types of capacitors can be used for input bypassing.
However, caution must be exercised when using multi-
layer ceramic capacitors. Because of the self resonant and
high Q characteristics of some types of ceramic capaci-
tors, high voltage transients can be generated under some
start-up conditions, such as connecting the charger input
to a hot power source. These transients can be minimized
by using X5R dielectric capacitors and/or by adding a 1.5
resistor in series with the ceramic input capacitor. For
more information, refer to Application Note 88.
Thermistor Interface
A thermistor connected to the NTC (negative temperature
coefficient) pin can be used to sense the battery tempera-
ture to determine if the battery is within an acceptable
temperature range for charging (between 0
°C and 50°C).
A Dale (curve 2) 10k thermistor is recommended although
many other types of thermistors can also be used. For
example, a BetaCHIP (curve 7) 10k thermistor or other 10k
thermistors with a room temperature beta of approxi-
mately 3400 will work well. The thermistor is connected
from NTC (pin 2) to ground and is biased up by an internal
28.6k trimmed thin film resistor that connects to VCC
through a P-channel MOSFET. This MOSFET also biases
an internal resistor string to ground, from which voltage
thresholds of approximately VCC/2 and VCC/8 are derived.
The NTC pin is compared to these thresholds by two
comparators that have wired-OR outputs. The thresholds
are selected such that an overtemperature condition will
occur when the thermistor resistance is less than approxi-
mately 4.1k and undertemperature condition will occur
when the thermistor resistance is greater than approxi-
mately 28.5k. These correspond to thermistor tempera-
tures of 50
°C and 0°C for the specific type of thermistor
listed above (many others will be close enough for most
purposes). The MOSFET is turned off during undervoltage
conditions, preventing the dividers that are biased from it
from drawing current from the battery when input power
is removed. The drop across the MOSFET is common to
both resistor dividers and does not cause any loss of
accuracy in the circuit. The comparators have approxi-
mately 10mV of hysteresis to prevent oscillations around
the trip points.
When an undertemperature or overtemperature condition
is sensed, the current amplifier pulldown is disabled and
DRV is pulled high, the timer is placed in a hold condition
with the count frozen until the battery temperature is
within an acceptable range. The end-of-charge compara-
tor is also disabled to prevent a premature end of charge
signal due to the lack of battery charging current.
APPLICATIONS INFORMATION
VCC
UV
28.6k
4050 AI
10k DALE
CURVE 2
NTC
THERMISTOR
TBAD
(TO CA,
EOC, TIMER)
2
NTC
NTC Interface Circuitry


Similar Part No. - LTC4050EMS-4.1

ManufacturerPart #DatasheetDescription
logo
Linear Integrated Syste...
LTC4050 LINEAR-LTC4050 Datasheet
195Kb / 18P
   Standalone 250mA Li-Ion Battery Charger in 2 횞 2 DFN
logo
Linear Technology
LTC4050 LINER-LTC4050 Datasheet
196Kb / 16P
   Standalone 750mA Li-Ion Battery Charger in 2 x 2 DFN
LTC4050 LINER-LTC4050 Datasheet
196Kb / 16P
   Standalone 750mA Li-Ion Battery Charger in 2 x 2 DFN
LTC4050 LINER-LTC4050 Datasheet
192Kb / 12P
   Lithium-Ion Linear Battery Charger with Thermistor Interface
LTC4050 LINER-LTC4050_15 Datasheet
192Kb / 12P
   Lithium-Ion Linear Battery Charger with Thermistor Interface
More results

Similar Description - LTC4050EMS-4.1

ManufacturerPart #DatasheetDescription
logo
Linear Technology
LTC4050 LINER-LTC4050_15 Datasheet
192Kb / 12P
   Lithium-Ion Linear Battery Charger with Thermistor Interface
logo
Dongguan Pingjingsemi T...
PJ4054B PJSEMI-PJ4054B Datasheet
3Mb / 6P
   Linear Lithium-ion Battery Charger
logo
Agere Systems
PSC1534 AGERE-PSC1534 Datasheet
1Mb / 8P
   Lithium-Ion Linear Battery Charger
logo
Dongguan Pingjingsemi T...
PJ4057 PJSEMI-PJ4057 Datasheet
3Mb / 5P
   Linear Lithium-ion Battery Charger
logo
Linear Technology
LTC1732-8.4 LINER-LTC1732-8.4 Datasheet
148Kb / 12P
   Lithium-Ion Linear Battery Charger Controller
LTC1732-4.2 LINER-LTC1732-4.2_15 Datasheet
181Kb / 12P
   Lithium-Ion Linear Battery Charger Controller
LTC1731ES8-8.4 LINER-LTC1731ES8-8.4 Datasheet
161Kb / 12P
   Lithium-Ion Linear Battery Charger Controller
logo
Shenzhen Huazhimei Semi...
HM4051ADR HMSEMI-HM4051ADR Datasheet
1Mb / 13P
   1A Lithium Ion Battery Linear Charger
HM4057F HMSEMI-HM4057F Datasheet
1Mb / 8P
   500mA linear lithium ion battery charger
logo
Guangdong Youtai Semico...
TP4057 UMW-TP4057 Datasheet
618Kb / 8P
   500mA linear lithium-ion battery charger
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12


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