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LTC4081EDD#TRPBF

Description
Linear Battery Charger Li-Ion/Li-Pol 500mA 4.2V 10-Pin DFN EP T/R
CategoryBattery management   
File Size434KB,24 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric Compare View All

LTC4081EDD#TRPBF Overview

Linear Battery Charger Li-Ion/Li-Pol 500mA 4.2V 10-Pin DFN EP T/R

LTC4081EDD#TRPBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
TypeLinear Battery Charger
Battery TypeLi-Pol|Li-Ion
Minimum Operating Supply Voltage (V)3.75
Typical Operating Supply Voltage (V)5
Maximum Operating Supply Voltage (V)5.5
Output Voltage (V)4.2
Output Current (mA)500
Minimum Operating Temperature (°C)0
Maximum Operating Temperature (°C)70
Supplier Temperature GradeExtended
Pin Count10
Standard Package NameDFN
Supplier PackageDFN EP
MountingSurface Mount
Package Height0.75(Max)
Package Length3
Package Width3
PCB changed10
Lead ShapeNo Lead
FEATURES
Battery Charger:
n
Constant-Current/Constant-Voltage Operation
with Thermal Feedback to Maximize Charge Rate
without Risk of Overheating
n
Internal 4.5-Hour Safety Timer for Termination
n
Charge Current Programmable Up to 500mA with
5% Accuracy
n
NTC Thermistor Input for Temperature Qualified
Charging
n
C/10 Charge Current Detection Output
n
5µA Supply Current in Shutdown Mode
Switching Regulator:
n
High Efficiency Synchronous Buck Converter
n
300mA Output Current (Constant-Frequency Mode)
n
2.7V to 4.5V Input Range (Powered from BAT Pin)
n
0.8V to V
BAT
Output Range
n
MODE Pin Selects Fixed (2.25MHz) Constant-Frequency
PWM Mode or Low I
CC
(23µA) Burst Mode
®
Operation
n
2µA BAT Current in Shutdown Mode
n
10-Lead, Low Profile (0.75 mm) 3mm
×
3mm DFN Package
LTC4081
500mA Li-Ion Charger
with NTC Input and
300mA Synchronous Buck
DESCRIPTION
The
LTC
®
4081
is a complete constant-current/constant-
voltage linear battery charger for a single-cell 4.2V
lithium-ion/polymer battery with an integrated 300mA
synchronous buck converter. A 3mm × 3mm DFN pack-
age and low external component count make the LTC4081
especially suitable for portable applications. Furthermore,
the LTC4081 is specifically designed to work within USB
power specifications.
The
CHRG
pin indicates when charge current has dropped
to ten percent of its programmed value (C/10). An internal
4.5-hour timer terminates the charge cycle. The full-
featured LTC4081 battery charger also includes trickle
charge, automatic recharge, soft-start (to limit inrush
current) and an NTC thermistor input used to monitor
battery temperature.
The LTC4081 integrates a synchronous buck converter
that is powered from the BAT pin. It has an adjustable
output voltage and can deliver up to 300mA of load cur-
rent. The buck converter also features low current high
efficiency Burst Mode operation that can be selected by
the MODE pin.
The LTC4081 is available in a 10-lead, low profile (0.75mm)
3mm × 3mm DFN package.
L,
LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
and ThinSOT and PowerPath are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents, including
6522118.
APPLICATIONS
n
n
n
n
Wireless Headsets
Bluetooth Applications
Portable MP3 Players
Multifunction Wristwatches
TYPICAL APPLICATION
510Ω
V
CC
(3.75V
TO 5.5V)
100k
Li-Ion Battery Charger with 1.8V Buck Regulator
100
80
BAT
EN_BUCK
NTC LTC4081
SW
FB
1O H
10pF
1M
V
OUT
(1.8V/300mA)
806Ω
806k
4081 TA01a
Buck Efficiency vs Load Current
(V
OUT
= 1.8V)
1000
EFFICIENCY
(Burst)
EFFICIENCY
(PWM)
100
POWER LOSS (mW)
POWER
LOSS 10
(PWM)
1
4.7 F
+
4.2V
Li-Ion/
POLYMER
BATTERY
EFFICIENCY (%)
V
CC
CHRG
500mA
60
40
4.7 F
100k
T
EN_CHRG
MODE GND PROG
POWER LOSS
(Burst)
20
4.7 F
0
0.01
V
BAT
= 3.8V 0.1
V
OUT
= 1.8V
L = 10 H
C = 4.7 F
0.01
0.1
1
10
100
1000
LOAD CURRENT (mA)
4081 TA01b
4081fa
For more information
www.linear.com/LTC4081
1

LTC4081EDD#TRPBF Related Products

LTC4081EDD#TRPBF LTC4081EDD#PBF
Description Linear Battery Charger Li-Ion/Li-Pol 500mA 4.2V 10-Pin DFN EP T/R Linear Battery Charger Li-Ion/Li-Pol 500mA 4.2V 10-Pin DFN EP Tube
EU restricts the use of certain hazardous substances Compliant Compliant
ECCN (US) EAR99 EAR99
Part Status Active Active
HTS 8542.39.00.01 8542.39.00.01
Type Linear Battery Charger Linear Battery Charger
Battery Type Li-Pol|Li-Ion Li-Pol|Li-Ion
Minimum Operating Supply Voltage (V) 3.75 3.75
Typical Operating Supply Voltage (V) 5 5
Maximum Operating Supply Voltage (V) 5.5 5.5
Output Voltage (V) 4.2 4.2
Output Current (mA) 500 500
Maximum Operating Temperature (°C) 70 70
Supplier Temperature Grade Extended Extended
Pin Count 10 10
Standard Package Name DFN DFN
Supplier Package DFN EP DFN EP
Mounting Surface Mount Surface Mount
Package Height 0.75(Max) 0.75(Max)
Package Length 3 3
Package Width 3 3
PCB changed 10 10
Lead Shape No Lead No Lead
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