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LTC4080 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC4080
Description  500mA Standalone Li-Ion Charger with Integrated 300mA Synchronous Buck
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4080 Datasheet(HTML) 1 Page - Linear Technology

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LTC4080
1
4080fb
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
The LTC4080 is a complete constant-current/constant-
voltage linear battery charger for a single-cell 4.2V
lithium-ion battery with an integrated 300mA synchron-
ous buck converter. The small packages and low external
component count make the LTC4080 especially suitable for
portable applications. Furthermore, LTC4080 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 LTC4080 battery charger also includes
trickle charge, automatic recharge and soft-start (to limit
inrush current).
The LTC4080 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 LTC4080 is available in 10-lead, low profile (0.75 mm)
3mm
× 3mm DFN and MSOP Exposed Pad packages.
Complete Linear Battery Charger with Integrated
Buck Converter
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
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, LTM and Burst Mode are registered trademarks 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
BATTERY
CBAT
4.7
μF
RPROG
806
Ω
R2
806k
COUT
4.7
μF
4080 TA01a
CPL
10pF
R1
1M
LTC4080
EN_CHRG
EN_BUCK
MODE
SW
FB
PROG
VCC
BAT
VOUT
(1.8V/300mA)
L1, 1O
μH
GND
CIN
4.7
μF
VCC
(3.75V
to 5.5V)
+
LOAD CURRENT (mA)
0.01
40
60
80
0.1
10
100
11000
20
0
100
0
10
100
0.1
0.01
1000
4080 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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