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PDF LTC4075X Data sheet ( Hoja de datos )
| Número de pieza | LTC4075X | |
| Descripción | Dual Input USB/AC Adapter Standalone Li-Ion Battery Chargers | |
| 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
■ No External MOSFET, Sense Resistor or Blocking
Diode Needed
■ Thermal Regulation Maximizes Charging Rate
Without Risk of Overheating*
■ Preset Charge Voltage with ±0.6% Accuracy
■ Programmable Charge Current Termination
■ 18µA USB Suspend Current in Shutdown
■ Independent “Power Present” Status Outputs
■ Charge Status Output
■ Automatic Recharge
■ Available Without Trickle Charge (LTC4075X)
■ Available in a Thermally Enhanced, Low Profile
(0.75mm) 10-Lead (3mm × 3mm) DFN Package
U
APPLICATIO S
■ Cellular Telephones
■ Handheld Computers
■ Portable MP3 Players
■ Digital Cameras
LTC4075ww/wL.DTaCtaSh4ee0t4U7.co5mX
Dual Input USB/AC
Adapter Standalone Li-Ion
Battery Chargers
DESCRIPTIO
The LTC®4075/LTC4075X are standalone linear chargers
that are capable of charging a single-cell Li-Ion 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 LTC4075
terminates the charge cycle when the charge current drops
below the programmed termination threshold after the
final float voltage is reached. With power applied to both
inputs, the LTC4075/LTC4075X 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.
Other features include automatic recharge, undervoltage
lockout, charge status outputs, and “power present”
status outputs to indicate the presence of wall adapter
or USB power.
, 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, 6700364
TYPICAL APPLICATIO
Dual Input Battery Charger for Single-Cell Li-Ion
WALL
ADAPTER
USB
PORT
1µF
LTC4075
DCIN
BAT
USBIN
1µF IUSB
2k IDC ITERM
1% 1.24k
GND
1%
800mA (WALL)
500mA (USB)
+ 4.2V
SINGLE CELL
Li-Ion BATTERY
2k
1%
4075 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
–2.5
0
CONSTANT VOLTAGE
USBIN = 5V
TA = 25°C
RIDC = 1.25k
RIUSB = 2k
0.5 1.0 1.5 2.0 2.5 3.0
TIME (HR)
4075 TA01b
4075Xf
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1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
LTC4075ww/wL.DTaCtaS4he0et74U5.coXm
Charge Current vs Ambient
Temperature
1000
800
ONSET OF
THERMAL REGULATION
RIDC = 1.25k
600
400 RIDC = RIUSB = 2k
200 VDCIN = VUSBIN = 5V
VBAT = 4V
θJA = 40°C/W
0
–50 –25 0 25
50
75
TEMPERATURE (°C)
100 125
4075X G10
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
4075X G13
DCIN Shutdown Current vs
Temperature
50
45
40
VDCIN = 8V
35
30
25
VDCIN = 5V
20
15
VDCIN = 4.3V
10
5
0
–50 –25
ENABLE = 5V
0 25 50 75
TEMPERATURE (°C)
100
4075X G16
Charge Current vs
Supply Voltage
900
ONSET OF
THERMAL REGULATION
800
700
600
500
400
RIDC = 1.25k
VBAT = 4V
θJA = 35°C/W
300
4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0
VDCIN (V)
4075X G11
USBIN Power “On” Resistance
vs Temperature
800
VBAT = 4V
750 IBAT = 200mA
700
650
600
550
500
450
400
350
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4075X G14
USBIN Shutdown Current vs
Temperature
45
40
35
VUSBIN = 8V
30
25
20 VUSBIN = 5V
15
10 VUSBIN = 4.3V
5
0
–50 –25
ENABLE = 0V
0 25 50 75
TEMPERATURE (°C)
100
4075X G17
Charge Current vs Battery Voltage
1000
LTC4075X
800
600
400
200
LTC4075
0
2.4 2.7 3.0
VDCIN = VUSBIN = 5V
θJA = 40°C/W
RIDC = 1.25k
3.3 3.6 3.9 4.2 4.5
VBAT (V)
4075X G12
ENABLE Pin Threshold (On-to-Off)
vs Temperature
900
VDCIN = VUSBIN = 5V
850
800
750
700
650
600
–50 –25
0 25 50
TEMPERATURE (°C)
75
100
4075X G15
ENABLE Pin Pulldown Resistance
vs Temperature
2.8
2.6
2.4
2.2
2.0
1.8
1.6
–50 –25
0 25 50
TEMPERATURE (°C)
75 100
4075X G18
4075Xf
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U
OPERATIO
LTC4075ww/wL.DTaCtaSh4ee0t4U7.co5mX
The power supply status output (P⎯ W⎯ R⎯ ) has two states: pull-
down and high impedance. The pull-down state indicates
that power is present at either DCIN or USBIN. This output
is strong enough to drive an LED. If no power is applied at
either pin, the ⎯P⎯W⎯R pin is high impedance, indicating that
the LTC4075 lacks sufficient power to charge the battery.
The pull-down state is capable of sinking up to 10mA.
The USB power status output (USBPWR) has two states:
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 105°C. This feature protects
the LTC4075 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
pull-down and high impedance. The high impedance worst-case) ambient temperature with the assurance that
state indicates that the LTC4075 is being powered from the charger will automatically reduce the current in worst-
the USBIN input. The pull-down state indicates that the case conditions. DFN power considerations are discussed
charger is either powered from DCIN or is in a UVLO further in the Applications Information section.
condition (see Table 1). The pull-down state is capable of
sinking up to 1mA.
STARTUP
BAT < 2.9V
DCIN POWER APPLIED
ONLY USB POWER APPLIED
POWER SELECTION
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
CHRG STATE: PULLDOWN
2.9V < BAT
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
ENABLE
DRIVEN LOW
*LTC4075 ONLY
SHUTDOWN
MODE
IDCIN DROPS TO 20µA
CHRG STATE: Hi-Z
ENABLE
DRIVEN HIGH
DCIN POWER
REMOVED
ENABLE
DRIVEN LOW
USBIN POWER
REMOVED OR
DCIN POWER
APPLIED
SHUTDOWN
MODE
IUSBIN DROPS TO 18µA
CHRG STATE: Hi-Z
ENABLE
DRIVEN HIGH
4075 F01
Figure 1. LTC4075 State Diagram of a Charge Cycle
4075Xf
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC4075X.PDF ] | |
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