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LTC4080EDD-PBF

Description
500mA Standalone Li-Ion Charger with Integrated 300mA Synchronous Buck
File Size249KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC4080EDD-PBF Overview

500mA Standalone Li-Ion Charger with Integrated 300mA Synchronous Buck

FEATURES
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 V
BAT
Output Range
MODE Pin Selects Fixed (2.25MHz) Constant-Frequency
PWM Mode or Low I
CC
(23μA) Burst Mode
®
Operation
2μA BAT Current in Shutdown Mode
LTC4080
500mA Standalone Li-Ion
Charger with Integrated
300mA Synchronous Buck
DESCRIPTIO
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.
, 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.
APPLICATIO S
Wireless Headsets
Bluetooth Applications
Portable MP3 Players
Multifunction Wristwatches
TYPICAL APPLICATIO
V
CC
(3.75V
to 5.5V)
C
IN
4.7μF
V
CC
LTC4080
EN_CHRG
EN_BUCK
SW
FB
BAT
Li-Ion Battery Charger with 1.8V Buck Regulator
500mA
EFFICIENCY (%)
L1, 1OμH
C
PL
10pF
R1
1M
C
BAT
4.7μF
+
4.2V
Li-Ion
BATTERY
MODE GND PROG
R
PROG
806Ω
R2
806k
4080 TA01a
V
OUT
(1.8V/300mA)
C
OUT
4.7μF
U
20
U
U
Buck Efficiency vs Load Current
(V
OUT
= 1.8V)
100
EFFICIENCY
(Burst)
EFFICIENCY
(PWM)
1000
80
100
POWER LOSS (mW)
POWER
LOSS 10
(PWM)
0
60
40
POWER LOSS
(Burst)
0
0.01
V
BAT
= 3.8V 0.1
V
OUT
= 1.8V
L = 10μH
C = 4.7μF
0.01
0.1
1
10
100
1000
LOAD CURRENT (mA)
4080 TA01b
4080fb
1

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