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PDF LTC4053-4.2 Data sheet ( Hoja de datos )
| Número de pieza | LTC4053-4.2 | |
| Descripción | USB Compatible Lithium Ion Battery Charger | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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www.DataSheet4U.com
LTC4053-4.2
USB Compatible
Lithium-Ion Battery Charger
with Thermal Regulation
FEATURES
DESCRIPTIO
s Charges Single-Cell Li-Ion Batteries Directly from The LTC®4053 is a standalone linear charger for lithium-
USB Port
ion batteries that can be powered directly from a USB port.
s Thermal Regulation Maximizes Charge Rate
The IC contains an on-chip power MOSFET and eliminates
without Risk of Overheating*
the need for an external sense resistor and blocking diode.
s Programmable Charge Current with ±7% Accuracy Thermal regulation automatically adjusts charge current
s Low Dropout Operation
to limit die temperature during high power or high ambient
s No External MOSFET, Sense Resistor or Blocking
temperature conditions. This feature protects the end
Diode Required
product and the LTC4053 from thermal stress while the IC
s Programmable Charge Termination Timer
charges the battery at maximum rate without interruption.
s Preset Charge Voltage with ±1% Accuracy
s C/10 Charge Current Detection Output
s AC Present Logic Output
s 25µA Supply Current in Shutdown Mode
s Automatic Recharge
s Tiny Thermally Enhanced 10-Pin MSOP Package
The charge current and charge time can be set externally
with a single resistor and capacitor, respectively. When
the input supply (wall adapter or USB supply) is removed,
the LTC4053 automatically enters a low current sleep
mode, dropping the battery drain current to less than 5µA. DataShee
s Charge Current Monitor Useful for Gas GaugingD*ataSheet4TUh.ecoLmTC4053 also includes NTC temperature sensing,
s Thermistor Input for Temperature Qualified Charging C/10 detection circuitry, AC present logic, low battery
U charge conditioning (trickle charging) and shutdown (25µA
APPLICATIO S
supply current).
s Cellular Telephones
s Handheld Computers
s Charging Docks and Cradles
s MP3 Players
s Digital Cameras
The LTC4053 is available in a 10-pin thermally enhanced
MSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
*US Patent 6522118
TYPICAL APPLICATIO
USB Powered Standalone Li-Ion Charger
USB PORT
4.35V TO 5.5V
2
VCC
9
BAT
LTC4053-4.2
SYSTEM
+
LOAD
Li-Ion
BATTERY
48
TIMER SHDN
4.7µF
GND NTC PROG
5 6 7 3.74k
0.1µF
15k
SUSPEND
USB CONTROL
µC
100mA/
500mA
DataSheet4U.com
4053TA01
Charge Current vs Input Voltage
600
500 VBAT = 3.95V
TA = 25°C
RPROG = 3k
400
VBAT = 4.05V
300
200
VBAT = 4.15V
100
0
4.0
4.5 5.0
VCC (V)
5.5
4053 G04
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TYPICAL PERFOR A CE CHARACTERISTICS
LTC4053-4.2
et4U.com
PROG Pin Voltage
vs Charge Current
1.6
VCC = 5V
1.4 TA = 25°C
RPROG = 3k
1.2
1.0
0.8
0.6
0.4
0.2
0
0 50 100 150 200 250 300 350 400 450 500
CHARGE CURRENT (mA)
4052 G10
PROG Pin Voltage vs VCC
Constant Current Mode
1.515
1.510
VBAT = 3.5V
TA = 25°C
RPROG = 3k
1.505
1.500
1.495
1.490
1.485
4 4.5 5 5.5 6
VCC (V)
6.5 7
4053 G11
PROG Pin Voltage vs Temperature
Constant Current Mode
1.515
1.510
VCC = 5V
VBAT = 4V
RPROG = 3k
1.505
1.500
1.495
1.490
1.485
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
4053 G12
Trickle Charge Current
vs Temperature
12
VBAT = 2V
TA = 25°C
11 RPROG = 3k
10
9
8
7
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4053 G13
CHRG Pin Weak Pull-Down
Current vs Temperature
35
VCC = 5V
34 IBAT < C/10
33
32 DataSheet4U.com
31
30
29
28
27
26
25
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
LTC1323 • TPC05
CHRG Pin Output Low Voltage
vs Temperature
0.6
VCC = 5V
ICHRG = 5mA
0.5
DataShee
0.4
0.3
0.2
0.1
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4053 G15
Timer Error vs Temperature
5
VCC = 5V
4 CTIMER = 0.1µF
3
2
1
0
–1
–2
–3
–4
–5
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
LTC1323 • TPC05
Timer Error vs VCC
5
TA = 25°C
4 CTIMER = 0.1µF
3
2
1
0
–1
–2
–3
–4
–5
4 4.5 5 5.5
VCC (V)
6
6.5 7
4056 G17
DataSheet4U.com
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LTC4053-4.2
APPLICATIO S I FOR ATIO
V+ VDD
8
VCC
LTC4053
3
CHRG
400k
2k
µPROCESSOR
OUT
IN
4053 F03
Figure 3. Microprocessor Interface
VCC
RHOT
1%
RNTC
10k
NTC
7/8 VCC
1/2 VCC
–
+
+
–
TOO COLD
TOO HOT
full-scale current (C/10), the N-channel MOSFET is turned
3/160 VCC
+
off and a 30µA current source is connected to the CHRG
DISABLE NTC
pin. The IN pin will then be pulled high by the 2k pull-up.
By forcing the OUT pin to a high impedance state, the
current source will pull the pin low through the 400k
resistor. When the internal timer has expired, the CHRG
LTC4053
–
Figure 4
4053 F04
pin will assume a high impedance state and the 400k Thermistors
resistor will then pull the pin high to indicate that charging
et4U.com has terminated.
The LTC4053 NTC trip points were designed to work with
thermistors whose resistance-temperature characteris- DataShee
NTC Thermistor
DataSheet4tiUc.scofmollow Vishay Dale’s “R-T Curve 2”. The Vishay
NTHS0603N02N1002J is an example of such a ther-
The battery temperature is measured by placing a negative mistor. However, Vishay Dale has many thermistor prod-
temperature coefficient (NTC) thermistor close to the ucts that follow the “R-T Curve 2” characteristic in a variety
battery pack. The NTC circuitry is shown in Figure 4. To use
this feature, connect a 10k NTC thermistor between the
NTC pin and ground and a resistor (RHOT) from the NTC pin
to VCC. RHOT should be a 1% resistor with a value equal to
of sizes. Futhermore, any thermistor whose ratio of RCOLD
to RHOT is about 7.0 will also work (Vishay Dale R-T Curve
2 shows a ratio of RCOLD to RHOT of 2.816/0.4086 = 6.9).
the value of the chosen NTC thermistor at 50°C (this value NTC Layout Considerations
is 4.1k for a Vishay NTHS0603N02N1002J thermistor).
The LTC4053 goes into hold mode when the resistance of
the NTC thermistor drops below 4.1k which should be
approximately 50°C. The hold mode freezes the timer and
stops the charge cycle until the thermistor indicates a
return to a valid temperature. As the temperature drops,
the resistance of the NTC thermistor rises. The LTC4053
is designed to go into hold mode when the value of the NTC
thermistor increases to seven times the value of RHOT. For
a Vishay NTHS0603N02N1002J thermistor, this value is
28.7k which corresponds to approximately 0°C. The hot
and cold comparators each have approximately 2°C of
hysteresis to prevent oscillation about the trip point. The
NTC function can be disabled by grounding the NTC pin.
It is important that the NTC thermistor not be in close
thermal contact with the LTC4053. Because the LTC4053
package can reach temperatures in excess of the 50°C trip
point, the NTC function can cause a hysteretic oscillation
which turns the charge current on and off according to the
package temperature rather than the battery temperature.
This problem can be eliminated by thermally coupling the
NTC thermistor to the battery and not to the LTC4053.
Furthermore, it is essential that the VCC connection to
RHOT is made according to standard Kelvin sense tech-
niques. Since VCC is a high current path into the LTC4053,
it is essential to minimize voltage drops between the VCC
input pin and the top of RHOT.
DataSheet4U.com
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| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC4053-4.2.PDF ] | |
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