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LTC4080EDD#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
LTC4080
1
4080fc
For more information www.linear.com/LTC4080
TYPICAL APPLICATION
FEATURES DESCRIPTION
500mA Standalone Li-Ion
Charger with Integrated
300mA Synchronous Buck
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.
APPLICATIONS
n
Complete Linear Battery Charger with Integrated
Buck Converter
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
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
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
Wireless Headsets
n
Bluetooth Applications
n
Portable MP3 Players
n
Multifunction Wristwatches
L, LT , LT C , LT M, 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.
Li-Ion Battery Charger with 1.8V Buck Regulator
LOAD CURRENT (mA)
0.01
40
EFFICIENCY (%)
POWER LOSS (mW)
60
80
0.1 10 1001 1000
20
0
100
0
10
100
0.1
0.01
1000
4080 TA01b
V
BAT
= 3.8V
V
OUT
= 1.8V
L = 10μH
C = 4.7μF
EFFICIENCY
(Burst)
POWER LOSS
(Burst)
EFFICIENCY
(PWM)
POWER
LOSS
(PWM)
Buck Efficiency vs Load Current
(V
OUT
= 1.8V)
500mA
4.2V
Li-Ion
BATTERY
C
BAT
4.7μF
R
PROG
806Ω
R2
806k
C
OUT
4.7μF
4080 TA01a
C
PL
10pF
R1
1M
LTC4080
EN_CHRG
MODE
SW
FB
PROG
V
CC
BAT
EN_BUCK
V
OUT
(1.8V/300mA)
L1, 1OμH
GND
C
IN
4.7μF
V
CC
(3.75V
to 5.5V)
+
LTC4080
2
4080fc
For more information www.linear.com/LTC4080
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
(Note 1)
ORDER INFORMATION
ELECTRICAL CHARACTERISTICS
The l denotes specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C, V
CC
= 5V, V
BAT
= 3.8V, V
EN_CHRG
= 0V, V
EN_BUCK
= V
BAT
, V
MODE
=0V. (Note 2)
V
CC
, t < 1ms and Duty Cycle < 1% ............... –0.3V to 7V
V
CC
Steady State .......................................... –0.3V to 6V
BAT, CHRG
................................................... –0.3V to 6V
EN_CHRG, PROG, ACPR
..................–0.3V to V
CC
+ 0.3V
MODE, EN_BUCK
........................... –0.3V to V
BAT
+ 0.3V
FB
................................................................ –0.3V to 2V
BAT Short-Circuit Duration
...........................Continuous
TOP VIEW
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
10
9
6
7
8
4
5
3
2
1
BAT
V
CC
EN_CHRG
PROG
ACPR
SW
EN_BUCK
MODE
FB
CHRG
11
T
JMAX
= 110°C, θ
JA
= 43°C/W (NOTE 3)
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
1
2
3
4
5
BAT
V
CC
EN_CHRG
PROG
ACPR
10
9
8
7
6
SW
EN_BUCK
MODE
FB
CHRG
TOP VIEW
11
MSE PACKAGE
10-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 40°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
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
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4080EDD#PBF LTC4080EDD#TRPBF LBXD 10-Lead (3mm × 3mm) Plastic DFN –40°C to 85°C
LTC4080EMSE#PBF LTC4080EMSE#TRPBF LTCQH 10-Lead Plastic MSOP –40°C to 85°C
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/
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Supply Voltage (Note 4)
l
3.75 5 5.5 V
V
BAT
Input Voltage for the Switching
Regulator
(Note 5)
l
2.7 3.8 4.5 V
I
CC
Quiescent Supply Current (Charger On,
Switching Regulator Off)
V
BAT
= 4.5V (Forces I
BAT
and I
PROG
= 0),
V
EN_BUCK
= 0
l
110 300 µA
I
CC_SD
Supply Current in Shutdown (Both Battery
Charger and Switching Regulator Off)
V
EN_CHRG
= 5V, V
EN_BUCK
= 0, V
CC
> V
BAT
V
EN_CHRG
= 4V, V
EN_BUCK
= 0, V
CC
(3.5V) < V
BAT
(4V)
l
5
2
10 µA
µA
I
BAT_SD
Battery Current in Shutdown (Both Battery
Charger and Switching Regulator Off)
V
EN_CHRG
= 5V, V
EN_BUCK
= 0, V
CC
> V
BAT
V
EN_CHRG
= 4V, V
EN_BUCK
= 0, V
CC
(3.5V) < V
BAT
(4V)
l
0.6
2
5 µA
µA
LTC4080
3
4080fc
For more information www.linear.com/LTC4080
The l denotes specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C, V
CC
= 5V, V
BAT
= 3.8V, V
EN_CHRG
= 0V, V
EN_BUCK
= V
BAT
, V
MODE
=0V. (Note 2)
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Battery Charger
V
FLOAT
V
BAT
Regulated Output Voltage I
BAT
= 2mA
I
BAT
= 2mA, 4.3V < V
CC
< 5.5V
l
4.179
4.158
4.2
4.2
4.221
4.242
V
V
I
BAT
Current Mode Charge Current R
PROG
= 4k; Current Mode; V
EN_BUCK
= 0
R
PROG
= 0.8k; Current Mode; V
EN_BUCK
= 0
l
l
90
475
100
500
110
525
mA
mA
V
UVLO_CHRG
V
CC
Undervoltage Lockout Voltage V
CC
Rising
V
CC
Falling
l
l
3.5
2.8
3.6
3.0
3.7
3.2
V
V
V
PROG
PROG Pin Servo Voltage 0.8k ≤ R
PROG
≤ 4k
l
0.98 1.0 1.02 V
V
ASD
Automatic Shutdown Threshold Voltage (V
CC
– V
BAT
), V
CC
Low to High
(V
CC
– V
BAT
), V
CC
High to Low
60
15
82
32
100
45
mV
mV
t
SS_CHRG
Battery Charger Soft-Start Time 180 µs
I
TRKL
Trickle Charge Current V
BAT
= 2V, R
PROG
= 0.8k 35 50 65 mA
V
TRKL
Trickle Charge Threshold Voltage V
BAT
Rising
l
2.75 2.9 3.05 V
V
TRHYS
Trickle Charge Threshold Voltage
Hysteresis
100 150 350 mV
DV
RECHRG
Recharge Battery Threshold Voltage V
FLOAT
– V
BAT
, 0°C < T
A
< 85°C 70 100 130 mV
DV
UVCL1,
DV
UVCL2
(V
CC
– V
BAT
) Undervoltage Current
Limit Threshold Voltage
I
BAT
= 0.9 I
CHG
I
BAT
= 0.1 I
CHG
180
90
300
130
mV
mV
t
TIMER
Termination Timer
l
3 4.5 6 hrs
Recharge Time
l
1.5 2.25 3 hrs
Low-Battery Charge Time V
BAT
= 2.5V
l
0.75 1.125 1.5 hrs
I
C/10
End of Charge Indication Current Level R
PROG
= 2k (Note 6)
l
0.085 0.1 0.115 mA/mA
T
LIM
Junction Temperature in Constant-
Temperature Mode
115 °C
R
ON_CHRG
Power FET On-Resistance (Between
V
CC
and BAT)
I
BAT
= 350mA, V
CC
= 4V 750 mW
f
BADBAT
Defective Battery Detection CHRG Pulse
Frequency
V
BAT
= 2V 2 Hz
D
BADBAT
Defective Battery Detection CHRG Pulse
Frequency Duty Ratio
V
BAT
= 2V 75 %
Buck Converter
V
FB
FB Servo Voltage
l
0.78 0.80 0.82 V
I
FB
FB Pin Input Current V
FB
= 0.85V –50 50 nA
f
OSC
Switching Frequency
l
1.8 2.25 2.75 MHz
I
BAT_NL_CF
No-Load Battery Current (Continuous
Frequency Mode)
No-Load for Regulator, V
EN_CHRG
= 5V,
L = 10µH, C = 4.7µF
1.9 mA
I
BAT_NL_BM
No-Load Battery Current (Burst Mode
Operation)
No-Load for Regulator, V
EN_CHRG
= 5V,
MODE = V
BAT
, L = 10µH, C = 4.7µF
23 µA
I
BAT_SLP
Battery Current in SLEEP Mode V
EN_CHRG
= 5V, MODE = V
BAT
,
V
OUT
> Regulation Voltage
l
10 15 20 µA
V
UVLO_BUCK
Buck Undervoltage Lockout V
BAT
Rising
V
BAT
Falling
l
l
2.6
2.4
2.7
2.5
2.8
2.6
V
V
R
ON_P
PMOS Switch On-Resistance 0.95
W
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LTC4080EDD#PBF

Mfr. #:
Buy LTC4080EDD#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management 500mA Standalone Li-Ion Charger w/ Integrated 300mA Synchronous Buck n 3x3 DFN
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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