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PDF LTC4075HVX Data sheet ( Hoja de datos )
| Número de pieza | LTC4075HVX | |
| Descripción | High Voltage Dual Input Li-Ion/Polymer Battery Charger | |
| Fabricantes | Linear | |
| Logotipo |  |
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FEATURES
■ 22V Maximum Voltage for Wall Adapter and
USB Inputs
■ Charge 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
■ Overvoltage Lockout for Wall Adapter and
USB Inputs
■ No External MOSFET, Sense Resistor or Blocking
Diode Needed
■ Thermal Regulation Maximizes Charge Rate Without
Risk of Overheating*
■ Preset Charge Voltage with ±0.35% Accuracy
■ Programmable Charge Current Termination
■ 40μA USB Suspend Current in Shutdown
■ Independent “Power Present” Status Outputs
■ Charge Status Output
■ Automatic Recharge
■ Available in a Thermally Enhanced, Low Profile
(0.75mm) 10-Lead (3mm × 3mm) DFN Package
APPLICATIONS
■ Cellular Telephones
■ Handheld Computers
■ Portable MP3 Players
■ Digital Cameras
LTC4075HVX
High Voltage Dual Input
Li-Ion/Polymer Battery
Charger
DESCRIPTION
The LTC®4075HVX is a standalone linear charger that is
capable of charging a single-cell Li-Ion/Polymer 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. The
LTC4075HVX features a maximum 22V rating for both
wall adapter and USB inputs although charging stops if
the selected power source exceeds the overvoltage limit.
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 LTC4075HVX
terminates the charge cycle when the charge current drops
below the programmed termination threshold after the
final float voltage is reached.
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. No trickle charge allows full current from the charger
when a load is connected directly to the battery.
, 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, 6700364.
TYPICAL APPLICATION
Dual Input Battery Charger for Single-Cell Li-Ion
WALL
ADAPTER
USB
PORT
1μF
LTC4075HVX
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%
4075hvx TA01
Charge Current vs Supply Voltage
900 RIDC = 1.24k
800 RIUSB = 2k
VBAT = 3.5V
700
CHARGE FROM DCIN
600
500
400
CHARGE
300 FROM USBIN
200
100
0
2 3 4 5 6 7 8 19 20
SUPPLY VOLTAGE (V)
4075hvx TA01b
4075hvxf
1
1 page  
LTC4075HVX
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted.
Charge Current vs Ambient
Temperature
900
RIDC = 1.24k
800
700
600
RIDC = 2k
500
400
300
200
VDCIN = VUSBIN = 5V
100 VBAT = 4V
0 θJA = 30°C/W
–10 10 30 50 70
90 110 130 150
TEMPERATURE (°C)
4075hvx G10
DCIN Power FET On-Resistance
vs Temperature
800
VBAT = 4V
IBAT = 200mA
750
700
650
600
550
500
–10
10 30 50 70 90
TEMPERATURE (°C)
4075hvx G13
USBIN Shutdown Current vs
Temperature
60
VENABLE = 0V
55
50 VUSBIN = 5V
45
40
35 VUSBIN = 4.3V
30
25
20
–50 –25
0
25 50 75 100
TEMPERATURE (°C)
4075hvx G16
Charge Current vs
Supply Voltage
900
800
700
600
500
400
300
200
RIDC = 1.24V
100 VBAT = 4V
θJA = 30°C/W
0
4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0
VDCIN (V)
4075hvx G11
USBIN Power FET On-Resistance
vs Temperature
900
VBAT = 4V
IBAT = 200mA
850
800
750
700
650
600
–10
10 30 50 70 90
TEMPERATURE (°C)
4075hvx G14
DCIN Shutdown Current vs
Temperature
60
VENABLE = 5V
55
50 VDCIN = 5V
45
40
35
30 VDCIN = 4.3V
25
20
–50 –25
0
25 50 75 100
TEMPERATURE (°C)
4075hvx G17
Charge Current vs Battery Voltage
1000
800
600
400
200 VDCIN = VUSBIN = 5V
RIDC = 1.25V
θJA = 30°C/W
0
2.4 2.7 3.0 3.3 3.6 3.9 4.2 4.5
VBAT (V)
4075hvx G12
ENABLE Pin Threshold Voltage
(On-to-Off) vs Temperature
1000
VDCIN = VUSBIN = 5V
980
960
940
920
900
880
860
–10
10 30 50 70 90
TEMPERATURE (°C)
4075hvx G15
ENABLE Pin Pulldown Resistance
vs Temperature
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
–50 –25
0
25 50 75 100
TEMPERATURE (°C)
4075hvx G18
4075hvxf
5
5 Page 
LTC4075HVX
OPERATION
The USB power status open drain output (USBPWR) has
two states: pull-down and high impedance. The high imped-
ance state indicates that the LTC4075HVX is being powered
from the USBIN input. The pull-down state indicates that
the charger is either powered from DCIN or is in a UVLO
or an OVLO condition (see Table 1).
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 125°C. This feature
protects the LTC4075HVX 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. DFN package power
considerations are discussed further in the Applications
Information section.
DCIN POWER REMOVED
ENABLE = LOW
NO POWER
USB POWER REMOVED
POWER APPLIED
ENABLE = HIGH
6V > DCIN > 4.15V and
DCIN > BAT
NO
YES
CHARGE MODE
(DCIN)
FULL CURRENT
CHRG STATE: PULLDOWN
IBAT < ITERMINATE
IN VOLTAGE MODE
BAT < 4.075V
STANDBY MODE
(DCIN)
NO CHARGE CURRENT
CHRG STATE: Hi-Z
YES DCIN > 4.15V and
DCIN > BAT
NO
NO 6V > USBIN > 3.95V and
USBIN > BAT
YES
CHARGE MODE
(USBIN)
FULL CURRENT
CHRG STATE: PULLDOWN
IBAT < ITERMINATE
IN VOLTAGE MODE
STANDBY MODE
(USBIN)
NO CHARGE CURRENT
CHRG STATE: Hi-Z
BAT < 4.075V
SHUTDOWN MODE
(DCIN)
CHRG STATE: Hi-Z
SHUTDOWN MODE
(USBIN)
CHRG STATE: Hi-Z
4075hvx F01
Figure 1. LTC4075HVX State Diagram of a Charge Cycle
4075hvxf
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC4075HVX.PDF ] | |
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