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PDF LTC4076 Data sheet ( Hoja de datos )
| Número de pieza | LTC4076 | |
| Descripción | Dual Input Standalone Li-Ion Battery Charger | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
■ Charges Single-Cell Li-Ion Batteries from Wall
Adapter and USB Inputs
■ Automatic Input Power Detection and Selection
■ Charge Current Programmable up to 950mA from
Wall Adapter Input
■ C/X Charge Current Termination
■ Thermal Regulation Maximizes Charge Rate
Without Risk of Overheating*
■ Preset Charge Voltage with ±0.6% Accuracy
■ 18µA USB Suspend Current in Shutdown
■ Power Present Status Output
■ Charge Status Output
■ Automatic Recharge
■ Available in a Thermally Enhanced, Low Profile
(0.75mm) 10-Lead (3mm
APPLICATIOUS
×
3mm)
DFN
Package
■ Cellular Telephones
■ Handheld Computers
■ Portable MP3 Players
■ Digital Cameras
LTC4076www.DataSheet4U.com
Dual Input Standalone
Li-Ion Battery Charger
DESCRIPTIO
The LTC®4076 is a standalone linear charger that is capable
of charging a single-cell Li-Ion battery from both wall
adapter and USB inputs. The charger 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 LTC4076
terminates the charge cycle when the charge current drops
below the user programmed termination threshold after
the final float voltage is reached. The LTC4076 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 automatic recharge, undervoltage
lockout, charge status output, power present status output
to indicate the presence of wall adapter or USB power and
high power/low power mode (C/5) for USB compatible
applications.
, LT, LTC and LTM 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 APPLICATIO
Dual Input Battery Charger for Single-Cell Li-Ion
WALL
ADAPTER
USB
PORT
1F
LTC4076
DCIN
BAT
1F
2k
1%
1.24k
1%
USBIN HPWR
IUSB
IDC ITERM
GND
800mA (WALL)
500mA (USB)
+ 4.2V
SINGLE CELL
Li-Ion BATTERY
1k
1%
4076 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
HPWR = 5V
0 0.5 1.0 1.5 2.0 2.5 3.0
TIME (HR)
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1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
LTC4076www.DataSheet4U.com
CHRG Pin I-V Curve
35
VDCIN = VUSBIN = 5V
30
25
20
TA = – 40°C
TA = 25°C
TA = 90°C
15
10
5
0
01
2 34 5
VCHRG (V)
67
4076 G08
Charge Current vs Battery Voltage
1000
800
600
400
200 VDCIN = VUSBIN = 5V
θJA = 40°C/W
RIDC = 1.25k
0
2.4 2.7 3.0 3.3 3.6 3.9 4.2 4.5
VBAT (V)
4076 G11
EN Pin Threshold (Rising) vs
Temperature
900
VDCIN = VUSBIN = 5V
850
800
750
700
650
600
–50 –25
0 25 50
TEMPERATURE (°C)
75 100
4076 G14
Charge Current vs Ambient
Temperature
1000
ONSET OF
THERMAL REGULATION
800
RIDC = 1.25k
600
400 RIDC = RIUSB = 2k
200
HPWR = 5V
VDCIN = VUSBIN = 5V
VBAT = 4V
0 θJA = 40°C/W
–50 –25 0 25
50
75
TEMPERATURE (°C)
100 125
4076 G09
DCIN Power FET “On” Resistance
vs Temperature
550 VBAT = 4V
IBAT = 200mA
500
450
400
350
300
250
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4076 G12
HPWR Pin Threshold (Rising) vs
Temperature
900
VDCIN = VUSBIN = 5V
850
800
750
700
650
600
–50 –25
0 25 50
TEMPERATURE (°C)
75 100
4076 G15
Charge Current vs Supply Voltage
900 ONSET OF
THERMAL REGULATION
800
700
600
500
400
RIDC = 1.25k
VBAT = 4V
θJA = 35°C/W
3004.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0
VDCIN (V)
4076 G10
USBIN Power FET “On” Resistance
vs Temperature
800 VBAT = 4V
750 IBAT = 200mA
HPWR = 5V
700
650
600
550
500
450
400
350
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4076 G13
DCIN Shutdown Current vs
Temperature
50
45
40
35
VDCIN = 8V
30
25
20
VDCIN = 5V
15
10
VDCIN = 4.3V
5
0
–50 –25
EN = 5V
0 25 50 75
TEMPERATURE (°C)
100
4076 G16
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OPERATIOU
The power supply status output (PWR) has two states:
pull-down and high impedance. The pull-down state
indicates that power is present at either DCIN or USBIN.
If no power is applied at either pin, the PWR pin is high
impedance, indicating that the LTC4076 lacks sufficient
power to charge the battery. The pull-down state is capable
of sinking up to 10mA.
Thermal Limiting
An internal thermal feedback loop reduces the programmed
charge current if the die temperature attempts to rise above
LTC4076www.DataSheet4U.com
a preset value of approximately 105°C. This feature protects
the LTC4076 from excessive temperature and allows the
user to push the limits of the power handling capability of
a given circuit board without risk of damaging 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. DFN power considerations are discussed
further in the Applications Information section.
STARTUP
BAT < 2.9V
DCIN POWER APPLIED
POWER SELECTION
ONLY USB POWER APPLIED
TRICKLE CHARGE
MODE
1/10th FULL CURRENT
CHRG STATE: PULLDOWN
DCIN POWER
REMOVED
USBIN POWER
REMOVED OR
DCIN POWER
APPLIED
TRICKLE CHARGE
MODE
1/10th FULL CURRENT
CHRG STATE: PULLDOWN
BAT < 2.9V
BAT > 2.9V
2.9V < BAT
CHARGE
MODE
FULL CURRENT
CHRG STATE: PULLDOWN
IBAT < ITERMINATE
IN VOLTAGE MODE
BAT > 2.9V
CHARGE
MODE
FULL CURRENT⇒HPWR = HIGH
1/5 FULL CURRENT⇒HPWR = LOW
2.9V < BAT
CHRG STATE: PULLDOWN
IBAT < ITERMINATE
IN VOLTAGE MODE
BAT < 4.1V
STANDBY
MODE
NO CHARGE CURRENT
CHRG STATE: Hi-Z
STANDBY
MODE
NO CHARGE CURRENT
CHRG STATE: Hi-Z
BAT < 4.1V
EN
DRIVEN LOW
SHUTDOWN
MODE
IDCIN DROPS TO 20µA
CHRG STATE: Hi-Z
EN
DRIVEN HIGH
DCIN POWER
REMOVED
EN
DRIVEN HIGH
USBIN POWER
REMOVED OR
DCIN POWER
APPLIED
SHUTDOWN
MODE
IUSBIN DROPS TO 18µA
CHRG STATE: Hi-Z
EN
DRIVEN LOW
4076 F01
Figure 1. LTC4076 State Diagram of a Charge Cycle
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11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC4076.PDF ] | |
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