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LTC4080XEMSE-PBF Datasheet(PDF) 1 Page - Linear Technology

Part # LTC4080XEMSE-PBF
Description  500mA Standalone Li-Ion Charger with Integrated 300mA Synchronous Buck in 3mm3mm DFN
Download  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4080XEMSE-PBF Datasheet(HTML) 1 Page - Linear Technology

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LTC4080X
1
4080Xf
Wireless Headsets
Bluetooth Applications
Portable MP3 Players
Multifunction Wristwatches
Li-Ion Battery Charger with 1.8V Buck Regulator
500mA Standalone Li-Ion
Charger with Integrated 300mA
Synchronous Buck in 3mm × 3mm DFN
The LTC4080X 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 package
and low external component count make the LTC4080X
especially suitable for portable applications. Furthermore,
the LTC4080X is specifically designed to work within USB
power specifications.
The
⎯C⎯H⎯R⎯G 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 LTC4080X battery charger also includes
automatic recharge and soft-start to limit inrush current.
If trickle charging is desired, please see the LTC4080
datasheet.
The LTC4080X 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 LTC4080X is available in 10-lead, low profile (0.75 mm)
3mm × 3mm DFN and 10-lead MSE packages.
Complete Linear Battery Charger with Integrated
Buck Converter in 3mm x 3mm DFN Package
Battery Charger:
Constant-Current/Constant-Voltage Operation
with Thermal Feedback to Maximize Charge Rate
Without Risk of Overheating
Internal 4.5 Hour Safety Timer for Termination
Charge Current Programmable Up to 500mA with
5% Accuracy
C/10 Charge Current Detection Output
5µA Supply Current in Shutdown Mode
Switching Regulator:
High Efficiency Synchronous Buck Converter
300mA Output Current (Constant-Frequency Mode)
2.7V to 4.5V Input Range (Powered from BAT Pin)
0.8V to VBAT Output Range
MODE Pin Selects Fixed (2.25MHz) Constant-Frequency
PWM Mode or Low ICC (23µA) Burst Mode
®
Operation
2µA BAT Current in Shutdown Mode
APPLICATIO S
FEATURES
DESCRIPTIO
TYPICAL APPLICATIO
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents,
including 6522118.
500mA
4.2V
Li-Ion/
POLYMER
BATTERY
4.7
µF
806
806k
COUT
4.7
µF
4080X TA01a
10pF
1M
LTC4080X
EN_CHRG
EN_BUCK
MODE
SW
FB
PROG
VCC
BAT
VOUT
(1.8V/300mA)
1O
µH
GND
4.7
µF
VCC
(3.75V
to 5.5V)
+
LOAD CURRENT (mA)
0.01
40
60
80
0.1
10
100
1
1000
20
0
100
1
10
100
0.1
0.01
1000
4080X TA01b
VBAT = 3.8V
VOUT = 1.8V
L = 10
µH
C = 4.7
µF
EFFICIENCY
(Burst)
POWER LOSS
(Burst)
EFFICIENCY
(PWM)
POWER
LOSS
(PWM)
Buck Efficiency vs Load Current
(VOUT = 1.8V)


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