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PDF LTC4096X Data sheet ( Hoja de datos )
| Número de pieza | LTC4096X | |
| Descripción | Dual Input Standalone Li-Ion Battery Chargers | |
| Fabricantes | Linear | |
| Logotipo |  |
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LTC4096/LTC4096X
Dual Input Standalone
Li-Ion Battery Chargers
FEATURES
■ Charges Single-Cell Li-Ion Battery from Wall
Adapter and USB Inputs
■ Automatic Input Detection (DC Input has Charging
Priority)
■ Charge Current Programmable up to 1.2A from
Wall Adapter Input
■ C/X Charge Current Termination
■ Input Power Present Output (PWR) with 120mA
Drive Capability
■ Independent DC, USB Charge Current Programming
■ Preset Float Voltage with ±0.6% Accuracy
■ Thermal Regulation Maximizes Charge Rate Without
Risk of Overheating*
■ Charge Status Output
■ Automatic Recharge
■ 20µA Charger Quiescent Current in Shutdown
■ Available in a Thermally Enhanced, Low Profile
(0.75mm) 10-Lead (3mm × 3mm) DFN Package
APPLICATIONS
■ Cellular Telephones
■ MP3 Players
■ Portable Handheld Devices
DESCRIPTION
The LTC®4096/LTC4096X are standalone linear chargers
that are capable of charging a single-cell Li-Ion or Li-Poly-
mer battery from both wall adapter and USB inputs. The
chargers can detect power at the inputs and automatically
select the appropriate power source for charging.
No external sense resistor or blocking diode is required
for charging due to the internal MOSFET architecture.
Internal thermal feedback regulates the battery charge
current to maintain a constant die temperature during high
power operation or high ambient temperature conditions.
The float voltage is fixed at 4.2V and the charge current
is programmed with an external resistor. The LTC4096
terminates the charge cycle when the charge current drops
below the user programmed termination threshold after
the final float voltage is reached. The LTC4096 can be put
into shutdown mode reducing the DCIN supply current to
20µA, the USBIN supply current to 10µA, and the battery
drain current to less than 2µA even with power applied
to both inputs.
Other features include trickle charge (LTC4096 only), auto-
matic recharge, undervoltage lockout, charge status output
and power present output with 120mA drive capability.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Protected by U.S. Patents including 6522118.
TYPICAL APPLICATION
Dual Input Battery Charger for Single-Cell Li-Ion Battery
WALL
ADAPTER
USB
PORT
1mF
1mF ON OFF
1.24k
2k
LTC4096
DCIN
BAT
USBIN PWR
SUSP
IDC CHRG
IUSB ITERM
GND
800mA (WALL)
500mA (USB)
+ 4.2V
1k Li-Ion
BATTERY
2k
4096 TA01
Complete Charge Cycle (1100mAh Battery)
1000
800
600
400
200
0
4.2
4.0
3.8
3.6
3.4
5.0
2.5
0
CONSTANT VOLTAGE
USBIN = 5V
TA = 25°C
RIDC = 1.24k
RIUSB = 2k
0 0.5 1.0 1.5 2.0 2.5 3.0
TIME (HR)
4096 TA01b
4096xf
1
1 page  
LTC4096/LTC4096X
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
IDC Pin Voltage vs VDCIN
(Constant-Current Mode)
1.006 VBAT = 3.7V
RIDC = 10k
1.004
1.002
1.000
0.998
0.996
0.994
4.25 4.50 4.75 5.00 5.25 5.50
VDCIN (V)
4096 G10
Charge Current vs Battery Voltage
1200 VDCIN = 5V
1150 RIDC = 1k
1100
1050
1000
950
900
850
800
3.0 3.2 3.4 3.6 3.8 4.0
VBAT (V)
4096 G13
IUSB Pin Voltage vs VUSBIN
(Constant-Current Mode)
1.006 VBAT = 3.7V
RIUSB = 10k
1.004
1.002
1.000
0.998
0.996
0.994
4.25 4.50 4.75 5.00 5.25 5.50
VUSBIN (V)
4096 G11
Charge Current vs Battery Voltage
600 VUSBIN = 5V
575 RIUSB = 2k
550
525
500
475
450
425
400
3.0 3.2 3.4 3.6 3.8 4.0
VBAT (V)
4096 G14
Recharge Threshold Voltage
vs Temperature
70 VDCIN = VUSBIN = 5V
65
60
55
50
45
40
35
30
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
4096 G12
Charge Current vs Ambient
Temperature with Thermal
Regulation
1200
RIDC = 1k
1000
THERMAL REGULATION
800
600 RIUSB = 2k
400
200 VDCIN = VUSBIN = 5V
VBAT = 3.7V
0 θJA = 40°C/W
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
4096 G15
Charge Current vs Supply Voltage
104 VBAT = 3.7V
102
RIDC = 10k
100
RIUSB = 10k
98
96
4.25
4.50 4.75 5.00 5.25 5.50
VDCIN, VUSBIN (V)
4096 G16
Charge Current vs Battery Voltage
1200
1000
LTC4096X
800
600
400
200
LTC4096
0
2.0 2.5
VDCIN = 5V
RIDC = 1k
θJA = 40°C/W
3.0 3.5
VBAT (V)
4.0 4.5
4096 G17
Charge Current vs Battery Voltage
600
LTC4096X
500
400
300
200
100
LTC4096
0
2.0 2.5
VUSBIN = 5V
RIUSB = 2k
θJA = 40°C/W
3.0 3.5
VBAT (V)
4.0 4.5
4096 G18
4096xf
5
5 Page 
LTC4096/LTC4096X
APPLICATIONS INFORMATION
Manual Shutdown
The SUSP pin has a 3.4MΩ pulldown resistor to GND. A
logic low enables the charger and logic high disables it
(the pulldown defaults the charger to the charging state).
The DCIN input draws 20µA when the charger is in shut-
down. The USBIN input draws 20µA during shutdown if
no power is applied to DCIN, but draws only 10µA when
VDCIN > VUSBIN.
Thermal Limiting
An internal thermal feedback loop reduces the programmed
charge current if the die temperature attempts to rise
above a preset value of approximately 115°C. This feature
protects the LTC4096 from excessive temperature and
allows the user to push the limits of the power handling
capability of a given circuit board without risk of damag-
ing the device. The charge current can be set according
to typical (not worst case) ambient temperature with the
assurance that the charger will automatically reduce the
current in worst case conditions. A safety thermal shut
down circuit will turn off the charger if the die temperature
rises above a value of approximately 150°C. DFN power
considerations are discussed further in the Applications
Information section.
STARTUP
DCIN POWER APPLIED
ONLY USB POWER APPLIED
POWER SELECTION
BAT < 2.9V
TRICKLE CHARGE*
MODE
1/10th FULL CURRENT
CHRG STATE: PULLDOWN
PWR STATE: DCIN
2.9V < BAT
BAT > 2.9V
CHARGE
MODE
FULL CURRENT
CHRG STATE: PULLDOWN
PWR STATE: DCIN
IBAT < ITERMINATE
IN VOLTAGE MODE
DCIN POWER
REMOVED
USBIN POWER
REMOVED OR
DCIN POWER
APPLIED
TRICKLE CHARGE*
MODE
1/10th FULL CURRENT
CHRG STATE: PULLDOWN
PWR STATE: USBIN
BAT > 2.9V
CHARGE
MODE
FULL CURRENT
CHRG STATE: PULLDOWN
PWR STATE: USBIN
BAT < 2.9V
2.9V < BAT
IBAT < ITERMINATE
IN VOLTAGE MODE
BAT < 4.15V
STANDBY
MODE
NO CHARGE CURRENT
CHRG STATE: Hi-Z
PWR STATE: DCIN
STANDBY
MODE
NO CHARGE CURRENT
CHRG STATE: Hi-Z
PWR STATE: USBIN
BAT < 4.15V
SUSP
DRIVEN LOW
SHUTDOWN
MODE
IDCIN DROPS TO 20µA
CHRG STATE: Hi-Z
PWR STATE: DCIN
*NOT PRESENT IN THE "X" VERSION
SUSP
DRIVEN HIGH
DCIN POWER
REMOVED
SUSP
DRIVEN HIGH
USBIN POWER
REMOVED OR
DCIN POWER
APPLIED
SHUTDOWN
MODE
IUSBIN DROPS TO 20µA
SUSP
DRIVEN LOW
CHRG STATE: Hi-Z
PWR STATE: USBIN
4096 F01
Figure 1. LTC4096 State Diagram of a Charge Cycle
4096xf
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC4096X.PDF ] | |
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