Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

LTC4061-4.4 Datasheet(PDF) 10 Page - Linear Technology

Part # LTC4061-4.4
Description  Standalone Linear Li-Ion Battery Charger with Thermistor Input
Download  20 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4061-4.4 Datasheet(HTML) 10 Page - Linear Technology

Back Button LTC4061-4.4 Datasheet HTML 6Page - Linear Technology LTC4061-4.4 Datasheet HTML 7Page - Linear Technology LTC4061-4.4 Datasheet HTML 8Page - Linear Technology LTC4061-4.4 Datasheet HTML 9Page - Linear Technology LTC4061-4.4 Datasheet HTML 10Page - Linear Technology LTC4061-4.4 Datasheet HTML 11Page - Linear Technology LTC4061-4.4 Datasheet HTML 12Page - Linear Technology LTC4061-4.4 Datasheet HTML 13Page - Linear Technology LTC4061-4.4 Datasheet HTML 14Page - Linear Technology Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 20 page
background image
LTC4061-4.4
10
406144fb
1 The Defective Battery Detection feature is only available when time termination is being used.
OPERATIO
Undervoltage Lockout (UVLO)
An internal undervoltage lockout circuit monitors the
input voltage and keeps the charger in shutdown mode
until VCC rises above the undervoltage lockout threshold
(3.8V). The UVLO circuit has a built-in hysteresis of
200mV. Furthermore, to protect against reverse current in
the power MOSFET, the UVLO circuit keeps the charger in
shutdown mode if VCC falls to less than 45mV above the
battery voltage. Hysteresis of 145mV prevents the charger
from cycling in and out of shutdown.
Manual Shutdown
At any point in the charge cycle, the charger can be put
into shutdown mode by pulling the EN pin high. This
reduces the supply current to less than 50µA and the
battery drain current of the charger to less than 2µA. A
new charge cycle can be initiated by floating the EN pin
or pulling it low.
If shutdown is not required, leaving the pin disconnected
continuously enables the circuit.
Trickle-Charge and Defective Battery Detection
When the BAT pin voltage is below the 2.9V trickle charge
threshold (VTRIKL), the charger reduces the charge cur-
rent to 10% of the programmed value. If the battery
remains in trickle charge for more than 25% of the total
programmed charge time, the charger stops charging
and enters a FAULT state, indicating that the battery is
defective1. The LTC4061-4.4 indicates the FAULT state by
driving the CHRG open-drain output with a square wave.
The duty cycle of this waveform is 50% and the frequency
is set by CTIMER:
f
F
C
Hz
CHRG
TIMER
=
µ
0 1
6
.
ALEDdrivenbytheCHRGoutputexhibitsapulsingpattern,
indicating to the user that the battery needs replacing. To
exit the FAULT state, the charger must be restarted either
by toggling the EN input or removing and reapplying
power to VCC.
Charge Status Output (CHRG)
The charge status indicator pin has three states: pull-
down, pulse at 1.5Hz or 6Hz and high impedance. In the
pull-down state, an NMOS transistor pulls down on the
CHRGpincapableofsinkingupto10mA.Apull-downstate
indicatesthattheLTC4061-4.4ischargingabatteryandthe
charge current is greater than IDETECT (which is set by the
external resistor RDET). A high impedance state indicates
that the charge current has dropped below IDETECT. In the
case where the IDET pin is left unconnected (RDET = ∞,
IDETECT = 0), a high impedance state on CHRG indicates
that the LTC4061-4.4 is not charging.
Smart Pulsing Error Feature
The CHRG pin has two different pulsing states.
1) 6Hz (50% duty cycle) due to defective battery detec-
tion (see Trickle-Charge and Defective Battery Detection
section);
2) 1.5Hz (25% duty cycle if in time termination, 50% duty
cycle if in charge current or user termination) due to NTC
out-of-temperature condition.
NTC Thermistor (NTC)
The temperature of the battery is measured by placing
a negative temperature coefficient (NTC) thermistor
close to the battery pack. The NTC circuitry is shown in
Figure 1. To use this feature, connect the NTC thermistor,
RNTC, between the NTC pin and ground and a resistor,
RNOM, from the NTC pin to VCC. RNOM should be a 1%
resistor with a value equal to the value of the chosen
NTC thermistor at 25°C (this value is 100k
Ω for a Vishay
NTHS0603N01N1003J thermistor). The LTC4061-4.4
goes into hold mode when the resistance, RHOT, of the
NTC thermistor drops to 0.53 times the value of RNOM or
approximately53k
Ω,whichcorrespondstoapproximately
40°C. 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 LTC4061-4.4 is designed to
go into hold mode when the value of the NTC thermistor
increases to 3.26 times the value of RNOM. This resistance
is RCOLD. For a Vishay NTHS0603N01N1003J thermistor,
this value is 326k
Ω, which corresponds to approximately
0°C.Thehotandcoldcomparatorseachhaveapproximately
2°Cofhysteresistopreventoscillationaboutthetrippoint.
GroundingtheNTCpindisablestheNTCfunction.Formore
details refer to the Application Information section.


Similar Part No. - LTC4061-4.4

ManufacturerPart #DatasheetDescription
logo
Linear Integrated Syste...
LTC4061-4.4 LINEAR-LTC4061-4.4 Datasheet
195Kb / 18P
   Standalone 250mA Li-Ion Battery Charger in 2 횞 2 DFN
logo
Linear Technology
LTC4061-4.4 LINER-LTC4061-4.4 Datasheet
196Kb / 16P
   Standalone 750mA Li-Ion Battery Charger in 2 x 2 DFN
LTC4061-4.4 LINER-LTC4061-4.4 Datasheet
196Kb / 16P
   Standalone 750mA Li-Ion Battery Charger in 2 x 2 DFN
LTC4061-4.4 LINER-LTC4061-4.4_15 Datasheet
406Kb / 20P
   Standalone Linear Li-Ion Battery Charger with Thermistor Input
More results

Similar Description - LTC4061-4.4

ManufacturerPart #DatasheetDescription
logo
Linear Technology
LTC4061EDD-4.4 LINER-LTC4061EDD-4.4 Datasheet
224Kb / 20P
   Standalone Linear Li-Ion Battery Charger with Thermistor Input
LTC4061 LINER-LTC4061_15 Datasheet
278Kb / 20P
   Standalone Linear Li-Ion Battery Charger with Thermistor Input
LTC4061-4.4 LINER-LTC4061-4.4_15 Datasheet
406Kb / 20P
   Standalone Linear Li-Ion Battery Charger with Thermistor Input
LTC4061 LINER-LTC4061 Datasheet
665Kb / 20P
   Standalone Linear Li-lon Battery Charger with Thermistor Input
LTC4061 LINER-LTC4061_05 Datasheet
790Kb / 20P
   Standalone Linear Li-lon Battery Charger with Thermistor Input
logo
First Silicon Co., Ltd
FC5754 FS-FC5754 Datasheet
795Kb / 19P
   Standalone Linear Li-Ion Battery Charger
logo
Lowpower Semiconductor ...
LP4074 POWER-LP4074 Datasheet
353Kb / 8P
   600mA Standalone Linear Li-Ion Battery Charger
logo
SHANGHAI BELLING CO., L...
BL4054 BELLING-BL4054 Datasheet
337Kb / 16P
   800mA Standalone Linear Li-Ion Battery Charger
logo
Lowpower Semiconductor ...
LP4056H POWER-LP4056H Datasheet
416Kb / 7P
   1A Standalone Linear Li-Ion Battery Charger
LP28057A POWER-LP28057A Datasheet
416Kb / 7P
   1A Standalone 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 17 18 19 20


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