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Linear Technology Electronic Components Datasheet

LTC4080EMSE Datasheet

500mA Standalone Li-Ion Charger

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FEATURES
nn Complete Linear Battery Charger with Integrated
Buck Converter
Battery Charger:
nn Constant-Current/Constant-Voltage Operation
with Thermal Feedback to Maximize Charge Rate
without Risk of Overheating
nn Internal 4.5-Hour Safety Timer for Termination
nn Charge Current Programmable Up to 500mA with
5% Accuracy
nn C/10 Charge Current Detection Output
nn 5µA Supply Current in Shutdown Mode
Switching Regulator:
nn High Efficiency Synchronous Buck Converter
nn 300mA Output Current
nn 2.7V to 4.5V Input Range (Powered from BAT Pin)
nn 0.8V to VBAT Output Range
nn MODE Pin Selects Fixed (2.25MHz) Constant-Frequency
PWM Mode or Low ICC (23µA) Burst Mode® Operation
nn 2µA BAT Current in Shutdown Mode
APPLICATIONS
nn Wireless Headsets
nn Bluetooth Applications
nn Portable MP3 Players
nn Multifunction Wristwatches
LTC4080
500mA Standalone Li-Ion
Charger with Integrated
300mA Synchronous Buck
DESCRIPTION
The LTC®4080 is a complete constant-current/constant-
voltage linear battery charger for a single-cell 4.2V
lithium-ion battery with an integrated 300mA synchronous
buck converter. The small packages and low external
component count make the LTC4080 especially suitable
for portable applications. Furthermore, LTC4080 is specifi-
cally 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 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 (0.75mm)
3mm × 3mm DFN and MSOP Exposed Pad packages.
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.
TYPICAL APPLICATION
Li-Ion Battery Charger with 1.8V Buck Regulator
VCC
(3.75V
to 5.5V)
CIN
4.7μF
500mA
VCC
BAT
EN_BUCK
EN_CHRG
SW
L1, 1OμH
LTC4080
MODE
FB
CPL R1
10pF 1M
GND PROG
R2
RPROG
806k
806Ω
4080 TA01a
CBAT +
4.7μF
VOUT
(1.8V/300mA)
COUT
4.7μF
4.2V
Li-Ion
BATTERY
Buck Efficiency vs Load Current
(VOUT = 1.8V)
100
1000
EFFICIENCY
80 (Burst)
EFFICIENCY
(PWM)
60
100
POWER
LOSS 10
(PWM)
40
20
0
0.01
POWER LOSS
0
(Burst)
VBAT = 3.8V
VOUT = 1.8V
0.1
L = 10μH
C = 4.7μF
0.01
0.1
1
10 100 1000
LOAD CURRENT (mA)
4080 TA01b
For more information www.linear.com/LTC4080
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1


Linear Technology Electronic Components Datasheet

LTC4080EMSE Datasheet

500mA Standalone Li-Ion Charger

No Preview Available !

LTC4080
ABSOLUTE MAXIMUM RATINGS (Note 1)
VCC, t < 1ms and Duty Cycle < 1%................ –0.3V to 7V
VCC Steady State........................................... –0.3V to 6V
BAT, CHRG.................................................... –0.3V to 6V
EN_CHRG, PROG, ACPR...................–0.3V to VCC + 0.3V
MODE, EN_BUCK............................ –0.3V to VBAT + 0.3V
FB................................................................. –0.3V to 2V
BAT Short-Circuit Duration............................ Continuous
BAT Pin Current................................................... 800mA
PROG Pin Current.....................................................2mA
Junction Temperature.............................................125°C
Operating Temperature Range (Note 2)....–40°C to 85°C
Storage Temperature Range................... –65°C to 125°C
Lead Temperature (MSE, Soldering, 10 sec).......... 300°C
PIN CONFIGURATION
TOP VIEW
BAT 1
VCC 2
EN_CHRG 3
PROG 4
ACPR 5
10 SW
9 EN_BUCK
11
8 MODE
7 FB
6 CHRG
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 110°C, θJA = 43°C/W (NOTE 3)
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
BAT 1
VCC 2
EN_CHRG 3
PROG 4
ACPR 5
TOP VIEW
11
10 SW
9 EN_BUCK
8 MODE
7 FB
6 CHRG
MSE PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 40°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC4080EDD#PBF
LTC4080EDD#TRPBF
LBXD
10-Lead (3mm × 3mm) Plastic DFN
LTC4080EMSE#PBF
LTC4080EMSE#TRPBF LTCQH
10-Lead Plastic MSOP
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C, VCC = 5V, VBAT = 3.8V, VEN_CHRG = 0V, VEN_BUCK = VBAT, VMODE = 0V. (Note 2)
SYMBOL
VCC
VBAT
ICC
ICC_SD
IBAT_SD
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Supply Voltage
(Note 4)
l 3.75
5
5.5
V
Input Voltage for the Switching
Regulator
(Note 5)
l 2.7
3.8
4.5
V
Quiescent Supply Current (Charger On, VBAT = 4.5V (Forces IBAT and IPROG = 0),
l
Switching Regulator Off)
VEN_BUCK = 0
Supply Current in Shutdown (Both Battery VEN_CHRG = 5V, VEN_BUCK = 0, VCC > VBAT
l
Charger and Switching Regulator Off)
VEN_CHRG = 4V, VEN_BUCK = 0, VCC (3.5V) < VBAT (4V)
Battery Current in Shutdown (Both Battery VEN_CHRG = 5V, VEN_BUCK = 0, VCC > VBAT
l
Charger and Switching Regulator Off)
VEN_CHRG = 4V, VEN_BUCK = 0, VCC (3.5V) < VBAT (4V)
110
300
µA
5
10
µA
2
µA
0.6
5
µA
2
µA
4080fc
2
For more information www.linear.com/LTC4080


Part Number LTC4080EMSE
Description 500mA Standalone Li-Ion Charger
Maker Linear
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