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PDF LTC4065L-4.1 Data sheet ( Hoja de datos )
| Número de pieza | LTC4065L-4.1 | |
| Descripción | Standalone 250mA Li-Ion Battery Charger | |
| Fabricantes | Linear | |
| Logotipo |  |
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LTC4065L/
LTC4065LX/LTC4065L-4.1
Standalone 250mA Li-Ion
Battery Charger in 2 × 2 DFN
FEATURES
DESCRIPTION
n Charge Current Programmable up to 250mA with
5% Accuracy
n Complete Linear Charger in 2mm × 2mm DFN Package
n C/10 Charge Current Detection Output
n Timer Termination
n No External MOSFET, Sense Resistor or Blocking
Diode Required
n Preset Float Voltage with 0.6% Accuracy:
4.2V for LTC4065L/LTC4065LX
4.1V for LTC4065L-4.1
n Constant-Current/Constant-Voltage Operation with
Thermal Feedback to Maximize Charging Rate
Without Risk of Overheating
n Charge Current Monitor Output for Gas Gauging
n Automatic Recharge
n Charges Single Cell Li-Ion Batteries Directly from
USB Port
n 20μA Supply Current in Shutdown Mode
n Available Without Trickle Charge (LTC4065LX)
n Tiny 6-Lead (2mm × 2mm) DFN Package
APPLICATIONS
n Charger for Li-Ion Coin Cell Batteries
n Portable MP3 Players, Wireless Headsets
n Bluetooth Applications
n Multifunction Wristwatches
L, LT, LTC, LTM, Linear Technology and the Linear logo 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.
The LTC®4065L is a complete constant-current/constant-
voltage linear charger for single-cell lithium-ion batteries.
Its small size and ability to accurately regulate low charge
currents make the LTC4065L especially well-suited for
portable applications using low capacity rechargeable
lithium-ion cells. Furthermore, LTC4065L is specifically
designed to work within USB power specifications.
The CHRG pin indicates when charge current has dropped
to ten percent of its programmed value (C/10). An internal
timer terminates charging according to battery manufac-
turer specifications.
The LTC4065L-4.1 features a constant-voltage float voltage
of 4.1V. This 4.1V version of the standard LTC4065L is in-
tended for back-up or high ambient temperature applications.
Under these conditions, a reduced float voltage will trade-
off initial cell capacity for the benefit of increased capacity
retention over the life of the battery. A reduced float voltage
also minimizes swelling in prismatic and polymer cells.
When the input supply (wall adapter or USB supply) is
removed, the LTC4065L automatically enters a low current
state, dropping battery drain current to less than 1μA. With
power applied, LTC4065L can be put into shutdown mode,
reducing the supply current to less than 20μA.
The full-featured LTC4065L also includes automatic re-
charge, low-battery charge conditioning (trickle charging)
and soft-start (to limit inrush current).
TYPICAL APPLICATION
Standalone Li-Ion Battery Charger
VIN
4.3V TO 5.5V
C1
1μF
R1
510Ω
VCC BAT
LTC4065L
CHRG PROG
EN GND
100mA
+ 4.2V
Li-Ion
R3 BATTERY
2k
4065L TA01
Complete Charge Cycle (180mAh Battery)
LTC4065L and LTC4065LX
110
100 4.3
90 CONSTANT
80 CURRENT
70
CONSTANT
VOLTAGE
4.1
60
CHRG
3.9
50 TRANSITION
40 3.7
30
20
10
0
0
CHARGE
TERMINATION
3.5
VCC = 5V
RPROG = 2k
3.3
0.5 1 1.5 2 2.5 3 3.5 4 4.5
TIME (HOURS)
4065 TA02
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1
1 page  
LTC4065L/
LTC4065LX/LTC4065L-4.1
TYPICAL PERFORMANCE CHARACTERISTICS
Battery Regulation (Float) Voltage
vs Battery Charge Current
4.24 VCC = 5V
4.22 TA = 25°C
RPROG = 800Ω
4.20
4.18
LTC4065L
4.16
4.14
4.12
4.10
LTC4065L-4.1
4.08
4.06
0
50 100 150 200 250
IBAT (mA)
4065L G01
Battery Regulation (Float) Voltage
vs Temperature
4.24
4.22
4.20
LTC4065L
4.18
4.16
4.14
4.12
4.10
LTC4065L-4.1
4.08
4.06
–50 – 25 0
25 50 75
TEMPERATURE (°C)
100
4065L G02
Charge Current vs Supply Voltage
(Constant Current Mode)
30
RPROG = 13.3k
VBAT = 3.8V
25 TA = 25°C
20
15
10
5
0
4 4.5 5 5.5 6
SUPPLY VOLTAGE (V)
4065L G04
PROG Pin Voltage vs Temperature
(Constant Current Mode)
1.02
VCC = 5V
VBAT = 3.8V
RPROG = 13.3k
1.01
1.00
0.99
0.98
–50 –25
0
25 50 75 100
TEMPERATURE (°C)
4065L G07
Charge Current vs Battery Voltage
300
VCC = 5V
TA = 25°C
250 RPROG = 800Ω
LTC4065L
200
150
100
50
0
0
1
LTC4065L-4.1
234 5
VBAT (V)
4065L G05
PROG Pin Voltage
vs Charge Current
1.2
VCC = 5V
TA = 25°C
1.0 RPROG = 800Ω
0.8
0.6
0.4
0.2
0
0 50 100 150 200 250
IBAT (mA)
4065L G08
Battery Regulation (Float) Voltage
vs Supply Voltage
4.24
TA = 25°C
4.22 IBAT = 2mA
RPROG = 800Ω
4.20
LTC4065L
4.18
4.16
4.14
4.12
4.10
LTC4065L-4.1
4.08
4.06
4
4.5 5 5.5
SUPPLY VOLTAGE (V)
6
4065L G03
Charge Current vs Temperature
with Thermal Regulation
(Constant Current Mode)
300
250
200
THERMAL CONTROL
LOOP IN OPERATION
150
100
50 VCC = 5V
VBAT = 3.8V
RPROG = 800Ω
0
–50 0
50
100
TEMPERATURE (°C)
150
4065L G06
Power FET On Resistance
vs Temperature
2.0
VCC = 4V
IBAT = 150mA
1.8
1.6
1.4
1.2
1.0
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
4065L G09
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5 Page 
LTC4065L/
LTC4065LX/LTC4065L-4.1
OPERATION
Charge Current Soft-Start and Soft-Stop
The LTC4065L includes a soft-start circuit to minimize
the inrush current at the start of a charge cycle. When a
charge cycle is initiated, the charge current ramps from
zero to the full-scale current over a period of approximately
170μs. Likewise, internal circuitry slowly ramps the charge
current from full-scale to zero when the charger is shut off
or self terminates. This has the effect of minimizing the
transient current load on the power supply during start-up
and charge termination.
Constant-Current/Constant-Voltage/
Constant-Temperature
The LTC4065L use a unique architecture to charge a bat-
tery in a constant-current, constant-voltage and constant-
temperature fashion. Figure 1 shows a simplified block
diagram of the LTC4065L. Three of the amplifier feedback
loops shown control the constant-current, CA, constant-
voltage, VA, and constant-temperature, TA modes. A fourth
amplifier feedback loop, MA, is used to increase the output
impedance of the current source pair; M1 and M2 (note that
M1 is the internal P-channel power MOSFET). It ensures
that the drain current of M1 is exactly 205 times greater
than the drain current of M2.
Amplifiers CA and VA are used in separate feedback loops
to force the charger into constant-current or constant-
voltage mode, respectively. Diodes D1 and D2 provide
priority to either the constant-current or constant-voltage
loop, whichever is trying to reduce the charge current
the most. The output of the other amplifier saturates low
which effectively removes its loop from the system. When
in constant-current mode, CA servos the voltage at the
PROG pin to be precisely 1V. VA servos its inverting input
to an internal reference voltage when in constant-voltage
mode and the internal resistor divider, made up of R1 and
R2, ensures that the battery voltage is maintained at 4.2V
for LTC4065L/LTC4065LX or 4.1V for LTC4065L-4.1. The
PROG pin voltage gives an indication of the charge current
during constant-voltage mode as discussed in “Program-
ming Charge Current”.
The transconductance amplifier, TA, limits the die tempera-
ture to approximately 115°C when in constant-temperature
mode. Diode D3 ensures that TA does not affect the charge
current when the die temperature is below approximately
115°C. The PROG pin voltage continues to give an indica-
tion of the charge current.
In typical operation, the charge cycle begins in constant-
current mode with the current delivered to the battery equal
to 205V/RPROG. If the power dissipation of the LTC4065L
results in the junction temperature approaching 115°C,
the amplifier (TA) will begin decreasing the charge current
to limit the die temperature to approximately 115°C. As
the battery voltage rises, the LTC4065L either returns to
constant-current mode or enters constant-voltage mode
straight from constant-temperature mode. Regardless of
mode, the voltage at the PROG pin is proportional to the
current delivered to the battery.
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11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet LTC4065L-4.1.PDF ] | |
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