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PDF LTC4061-4.4 Data sheet ( Hoja de datos )
| Número de pieza | LTC4061-4.4 | |
| Descripción | Standalone Linear Li-Ion 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 4.375V Float Voltage with ±0.4% 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
APPLICATIOUS
■ Handheld Computers
■ Portable MP3 Players
■ Digital Cameras
LTC4061-4.4www.DataSheet4U.com
Standalone Linear Li-Ion Battery
Charger with Thermistor Input
DESCRIPTIO
The LTC®4061-4.4 is a full-featured, flexible, standalone
linear charger for single-cell 4.375V 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 CHRG 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 SmartStart 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 conditions.
The charge current is programmed with an external resis-
tor. With power applied, the LTC4061-4.4 can be put into
shutdown mode to reduce the supply current to 20µA and
the battery drain current to less than 5µA.
Other features include smart recharge, USB C/5 cur-
rent programming input, undervoltage lockout and AC
Present logic output.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
SmartStart is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6522118.
TYPICAL APPLICATIO
VIN
4.5V TO 8V
800mA Single-Cell Li-Ion Battery Charger
(C/10 Termination)
1µF
619Ω
VCC BAT
EN
C/5 CHRG
LTC4061-4.4
TIMER ACPR
PROG
IDET NTC
GND
800mA
+ 4.4V
SINGLE-CELL
Li-Ion BATTERY*
*SANYO BATTERIES:
UF553436T OR
UF553450T
40614.4 TA01a
Complete Charge Cycle (1100mAh Battery)
900 4.5
800 4.4
700
600 BATTERY
VOLTAGE
500
400
300
BATTERY
CURRENT
4.3
4.2
4.1
4.0
3.9
200
100
0
0
VCC = 5V
TA = 25°C
0.5 1.0 1.5
TIME (HOURS)
2.0
3.8
3.7
3.6
2.5
40614.4 TA01b
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1 page  
LTC4061-4.4www.DataSheet4U.com
TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise noted.
Internal Charge Timer vs
Temperature
195
190 VCC = 4.5V
185
VCC = 8V
180
175
170
165–50 –25
0
CTIMER = 0.1µF
25 50 75 100
TEMPERATURE (°C)
40614.4 G10
Charge Current vs Ambient
Temperature with Thermal
Regulation
1000
800
ONSET OF THERMAL
REGULATION
RPROG = 1.25k
600
RPROG = 2k
400
200
0
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
40614.4 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
40614.4 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
40614.4 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 7.0 7.5 8.0
VCC (V)
40614.4 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
40614.4 G17
NTC Fault Pulsing Frequency
vs Temperature
1.7
CTIMER = 0.1µF
1.6
1.5 VCC = 8V
VCC = 4.5V
1.4
1.3
1.2
–50 –25
0 25 50
TEMPERATURE (°C)
75 100
40614.4 G12
Recharge Threshold Voltage vs
Temperature
4.36
4.34
4.32
4.30
VCC = 8V
4.28
VCC = 4.5V
4.26
4.24
–50 –25
0
25 50
TEMPERATURE (°C)
75 100
40614.4 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)
40614.4 G18
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5 Page 
OPERATIOU
VCC
RNOM
NTC
2
RNTC
0.76 • VCC
–
+
0.35 • VCC
+
–
TOO COLD
TOO HOT
+
0.016 • VCC
LTC4061-4.4
–
ENABLE
40614.4 F01
Figure 1. NTC Circuit Information
LTC4061-4.4www.DataSheet4U.com
APPLICATIO S I FOR ATIO
Programming Charge Termination
Charge Time Termination
The LTC4061-4.4 can terminate a charge cycle using one
of several methods, allowing the designer considerable
flexibility in choosing an ideal charge termination algo-
rithm. Table 1 shows a brief description of the different
termination methods and their behaviors.
Table 1.
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)
=
3
(HOURS)
•
C TIMER
0.1µF
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.
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| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTC4061-4.4.PDF ] | |
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