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PDF LTC4061 Data sheet ( Hoja de datos )
| Número de pieza | LTC4061 | |
| Descripción | Standalone Linear Li-lon Battery Charger | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
■ Charge Current Programmable up to 1A
■ Charges Single Cell Li-Ion Batteries Directly from
USB Port
■ Preset Charge Voltage with ±0.35% Accuracy
■ Thermistor Input for Temperature Qualified
Charging
■ Input Supply Present Logic Output
■ Thermal Regulation Maximizes Charge Rate
Without Risk of Overheating*
■ Programmable Charge Current Detection/
Termination
■ Programmable Charge Termination Timer
■ Smart Pulsing Error Feature
■ SmartStartTM Prolongs Battery Life
■ 20µA Charger Quiescent Current in Shutdown
■ Available in a Low Profile (0.75mm) 10-Lead
(3mm × 3mm) DFN Package
U
APPLICATIO S
■ Handheld Computers
■ Portable MP3 Players
■ Digital Cameras
LTC4061
Standalone Linear Li-Ion Battery
Charger with Thermistor Input
DESCRIPTIO
The LTC®4061 is a full-featured, flexible, standalone linear
charger for single-cell Lithium-Ion batteries. It is capable
of operating within USB power specifications.
Both programmable time and programmable current
based termination schemes are available. Furthermore,
the ⎯C⎯H⎯R⎯G open-drain status pin can be programmed to
indicate the battery charge state according to the needs
of the application. Additional safety features designed to
maximize battery lifetime and reliability include NTC bat-
tery temperature sensing and the SmartStartTM charging
algorithm.
No external sense resistor or external blocking diode is
required for charging due to the internal MOSFET archi-
tecture. Internal thermal feedback regulates the charge
current to maintain a constant die temperature during
high power operation or high ambient temperature condi-
tions. The charge current is programmed with an external
resistor. With power applied, the LTC4061 can be put into
shutdown mode to reduce the supply current to 20µA and
the battery drain current to less than 2µA.
Other features include smart recharge, USB ⎯C⎯/⎯5 cur-
rent programming input, undervoltage lockout and AC
Present logic.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
SmartStart is a trademark of Linear Technology Corporation.
*Protected by U.S. Patents including 6522118.
TYPICAL APPLICATIO
800mA Single Cell Li-Ion Battery Charger
(C/10 Termination)
VIN
4.3V TO 8V
1µF
619Ω
VCC BAT
EN LTC4061
C/5 CHRG
TIMER ACPR
PROG
IDET NTC
GND
800mA
+ 4.2V
SINGLE CELL
Li-Ion BATTERY
4061 TA01a
Complete Charge Cycle (1100mAh Battery)
900 4.3
800 4.2
700 4.1
600 4.0
500
400
BATTERY
VOLTAGE
300
BATTERY
CURRENT
3.9
3.8
3.7
200
100 VCC = 5V
TA = 25°C
0
0 0.5 1.0 1.5 2.0
TIME (HOURS)
3.6
3.5
3.4
2.5 3.0
4061 TA01b
4061fa
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
LTC4061
Internal Charge Timer vs
Temperature
195
190
VCC = 4.3V
185
VCC = 8V
180
175
170
165
–50 –25 0
CTIMER = 0.1µF
25 50 75 100
TEMPERATURE (°C)
4061 G10
Charge Current vs Ambient
Temperature with Thermal
Regulation
1000
ONSET OF THERMAL
REGULATION
800
RPROG = 1.25k
600
RPROG = 2k
400
200
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4061 G13
Power FET “ON” Resistance vs
Temperature
500
VCC = 4V
IBAT = 200mA
450
400
350
300
250
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
4061 G16
NTC Fault Pulsing Frequency
vs VCC
1.60
CTIMER = 0.1µF
1.55
1.50
1.45
1.40
1.35
1.30
4.0
4.5 5.0
5.5 6.0 6.5
VCC (V)
7.0 7.5 8.0
4061 G11
Charge Current vs Supply Voltage
104 VCC = 5V
VBAT = 4V
C/5 = 5V
102 RPROG = 10k
100
98
96
4.0
4.5 5.0
5.5 6.0 6.5
VCC (V)
7.0 7.5 8.0
4061 G14
Undervoltage Lockout Voltage vs
Temperature
3.900
3.875
3.850
3.825
3.800
3.775
3.750
3.725
3.700
–50 –25
0 25 50
TEMPERATURE (°C)
75 100
4061 G17
NTC Fault Pulsing Frequency
vs Temperature
1.7
CTIMER = 0.1µF
1.6
VCC = 8V
1.5
VCC = 4.3V
1.4
1.3
1.2
–50 –25
0 25 50
TEMPERATURE (°C)
75 100
4061 G12
Recharge Threshold Voltage vs
Temperature
4.16
4.14
4.12
VCC = 8V
4.10
VCC = 4.3V
4.08
4.06
4.04
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
4061 G15
Charge Current vs Battery Voltage
900
800
700
600
500
400
300
200
100
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
VBAT (V)
4061 G18
4061fa
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5 Page 
U
OPERATIO
VCC
RNOM
NTC
2
RNTC
0.76 • VCC
–
+
0.35 • VCC
+
–
TOO COLD
TOO HOT
+
0.016 • VCC
LTC4061
–
ENABLE
4061 F01
Figure 1. NTC Circuit Information
LTC4061
APPLICATIO S I FOR ATIO
Programming Charge Termination
The LTC4061 can terminate a charge cycle using one of
several methods, allowing the designer considerable flex-
ibility in choosing an ideal charge termination algorithm.
Table 1 shows a brief description of the different termina-
tion methods and their behaviors.
Charge Time Termination
Connecting a capacitor (CTIMER) to the TIMER pin enables
the timer and selects charge time termination. The total
charge time is set by:
TIME (HOURS) = 0.1µF • 3 HOURS
C TIMER
Table 1.
METHOD
Charge
Time
Termination
Mode
Charge
Current
Termination
User
Selectable
Charge
Termination
TIMER
0.1µF to
GND
0.1µF to
GND
GND
GND
VCC
VCC
IDET
RDET to
GND
NC
RDET to
GND
NC
RDET to
GND
NC
CHARGER DESCRIPTION
Charges for 3 Hours. After 3 Hours, the Charger
Stops Charging and Enters Standby Mode.
Recharge Cycles Last for 1.5 Hours.
Charges for 3 Hours. After 3 Hours, the Charger
Stops Charging and Enters Standby Mode.
Recharge Cycles Last for 1.5 Hours.
Charges Until Charge Current Drops Below
IDET, Then Enters Standby Mode.
Charges Indefinitely.
Charges Indefinitely.
SmartStart Is Disabled.
Charges Indefinitely.
SmartStart Is Disabled.
CHRG OUTPUT DESCRIPTION
Pull-Down State While IBAT > IDET. High Impedance
State While IBAT < IDETECT or When Charging Is Stopped.
Pulsing State Available When NTC Is Used and
Is Still Charging.
Pull-Down State When Charging. High Impedance State
When Charging Is Stopped. Pulsing State Available
When NTC Is Used and Is Still Charging.
Pull-Down State When Charging. High Impedance State
When Charging Is Stopped. Pulsing State Available
When NTC Is Used and Is Still Charging.
Pull-Down State When Charging. High Impedance State
When Charging Is Stopped. Pulsing State Available
When NTC Is Used and Is Still Charging.
Pull-Down State While IBAT > IDETECT. High Impedance
State While IBAT < IDETECT or When Charging Is Stopped.
Pulsing State Available When NTC Is Used and
Is Still Charging.
Pull-Down State When Charging. High Impedance State
When Charging Is Stopped. Pulsing State Available
When NTC Is Used and Is Still Charging.
4061fa
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTC4061.PDF ] | |
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