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PDF LTC4063 Data sheet ( Hoja de datos )
| Número de pieza | LTC4063 | |
| Descripción | Standalone Linear Li-lon Battery Charger | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC4063
Standalone Linear Li-Ion
Charger with Micropower
Low Dropout Linear Regulator
FEATURES
■ Charge Current Programmable up to 1A
■ Integrated 100mA Adjustable Low Dropout Linear
Regulator
■ Charges Single Cell Li-Ion Batteries Directly from
USB Port
■ Preset Charge Voltage with ±0.35% Accuracy
■ No External MOSFET, Sense Resistor or Blocking
Diode Needed
■ Thermal Regulation Maximizes Charge Rate
Without Risk of Overheating*
■ Adjustable LDO Output Voltage Range:
1.2V to 4.2V
■ Programmable Charge Termination Timer
■ Programmable Charge Current Detection/Termination
■ SmartStartTM Prolongs Battery Life
■ Charge Status Output
■ 35µA Charger Quiescent Current in Shutdown
■ 15µA LDO Quiescent Current
■ Available in a Low Profile (0.75mm) 10-Lead
(3mm × 3mm) DFN Package
U
APPLICATIO S
■ Handheld Computers
■ Portable MP3 Players
■ Digital Cameras
DESCRIPTIO
The LTC®4063 is a standalone linear charger for single cell
lithium-ion batteries with an adjustable low dropout linear
regulator (LDO). The adjustable LDO regulates an output
voltage between 1.2V to 4.2V at up to 100mA load current.
When the input supply (wall adapter or USB supply) is
removed, the LDO regulates the output voltage without
interruption. The battery charger and LDO regulator can be
enabled individually.
No external sense resistor or external blocking diode is
required for charging due to the internal MOSFET architec-
ture. Internal thermal feedback regulates the charge cur-
rent 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. Charge termination
methods include minimum charge current or maximum
time. With power applied, the LTC4063 can be put into
shutdown mode to reduce the supply current to 35µA and
the battery drain current to less than 2µA.
Other features include smart recharge, undervoltage lock-
out, LDO current limiting and a charge status pin to
indicate when the charge cycle has completed.
, 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
Single Cell Li-Ion Battery Charger with Regulated 3V Output
(C/10 Termination)
VIN
4.3V TO 8V
1µF
715Ω
VCC BAT
LTC4063
OUT
TIMER
PROG
IDET
GND
FB
700mA
440k
160k
VOUT
3V
+
2.2µF
4.2V
SINGLE CELL
Li-Ion BATTERY
4063 TA01a
Complete Charge Cycle (900mAh Battery)
800
CONSTANT CURRENT
700
600
CONSTANT
VOLTAGE
4.75
4.50
4.25
500 4.00
400 3.75
300 3.50
200 3.25
100 VCC = 5V
3.00
TA = 25°C
0 2.75
0 0.25 0.50 0.75 1 1.25 1.50 1.75 2 2.25
TIME (HOURS)
4063 TA01b
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TYPICAL PERFORMANCE CHARACTERISTICS
Charge Current
vs Ambient Temperature
1000
ONSET OF THERMAL
REGULATION
800
RPROG = 1.25k
600
RPROG = 2k
400
200 VCC = 5V
VBAT = 4V
θJA = 40°C/W
0
–50 –25 0 25 50
75
TEMPERATURE (°C)
100 125
4063 G10
Power FET On Resistance
vs Temperature
650
VBAT = 4V
IBAT = 200mA
600 RPROG = 1.25k
550
500
450
400
350
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4063 G13
CHGEN Pin Pull-Down Resistance
vs Temperature
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
–50 –25
0 25 50
TEMPERATURE (°C)
75 100
4063 G16
Charge Current vs Supply Voltage
900
RPROG = 1.25k
VBAT = 3.3V
800 θJA = 35°C/W
TA = 25°C
700
ONSET OF THERMAL
REGULATION
600
500
400
300
4 4.5 5 5.5 6 6.5 7 7.5 8
VCC (V)
4063 G11
Shutdown Current vs Temperature
70
CHGEN = VCC
LDOEN = 0V
60
VCC = 8V
50
40 VCC = 5V
30 VCC = 4.3V
20
10
0
–50 –25
0 25 50
TEMPERATURE (°C)
75 100
4063 G14
FB Pin Regulated Voltage
vs Output Current
803
VBAT = 4.2V
802
801
800
799
TA = –40°C
798
TA = 25°C
TA = 90°C
TA = 115°C
797
0
20 40 60 80 100 120
IOUT (mA)
4063 G17
LTC4063
Recharge Threshold Voltage
vs Temperature
4.16
4.14
4.12
VCC = 4.3V
4.10
VCC = 8V
4.08
4.06
4.04
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
4063 G12
CHGEN Pin Threshold Voltage
(On-to-Off) vs Temperature
900
VCC = 5V
850
800
750
700
650
600
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4063 G15
FB Pin Regulated Voltage
vs Temperature
803
ILOAD = 1mA
802
801 VBAT = 4.2V
800
799 VBAT = 2.65V
798
797
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4063 G18
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U
OPERATIO
SINGLE CELL +
Li-Ion BATTERY
BAT OUT
LTC4063
FB
GND
VOUT
R2
COUT
R1
4063 F01
Figure 1. Adjustable Linear Regulator
Figure 1 shows how an external resistor divider sets the
regulator output voltage. The output voltage can be set
LTC4063
anywhere between 1.2V and 4.2V, although the upper limit
is limited by the battery voltage minus the regulator
dropout voltage.
VOUT = 800mV • ⎛⎝⎜1+ RR21⎞⎠⎟
In order to maintain stability under light load conditions,
the maximum recommended value of R1 is 160k.
APPLICATIO S I FOR ATIO
Programming Charge Termination
The LTC4063 terminates a charge cycle using several
methods, allowing the designer considerable flexibility in
choosing an ideal charge termination algorithm. Table 1
shows a brief description of the different termination
methods and their behavior.
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
CTIMER
When the programmed time has elapsed, the charge cycle
terminates and the charger enters standby mode. Subse-
quent recharge cycles terminate when half the programmed
time has elapsed.
The IDET pin determines the behavior of the CHRG output.
Connecting a resistor (RDET) from the IDET pin to ground
sets the charge current detection threshold, IDETECT:
IDETECT
=
RPROG
10RDET
• ICHG
=
100V
RDET
or
RDET
=
100V
IDETECT
Table 1
METHOD
Charge Time
Termination
TIMER
0.1µF to
GND
IDET
RDET to
GND
CHARGER DESCRIPTION
Charges for 3 Hours. After 3 Hours, the Charger
Stops Charging and Enters Standby Mode.
Recharge Cycles Last for 1.5 Hours
CHRG OUTPUT DESCRIPTION
Pull-Down State While IBAT > IDETECT. High Impedance
State While IBAT < IDETECT or When Charging is Stopped
0.1µF to NC Charges for 3 Hours. After 3 Hours, the Charger Pull-Down State When Charging. High Impedance State
GND
Stops Charging and Enters Standby Mode.
When Charging is Stopped
Recharge Cycles Last for 1.5 Hours
Charge Current
Termination
GND RDET to Charges Until Charge Current Drops Below
GND IDETECT, Then Enters Standby Mode
Pull-Down State When Charging. High Impedance State
When Charging is Stopped
GND NC Charges Indefinitely Until CHGEN Pin is Pulled Pull-Down State When Charging. High Impedance State
High When Charging is Stopped
User-Selectable VCC RDET to Charges Indefinitely Until CHGEN Pin is Pulled Pull-Down State While IBAT > IDETECT. High Impedance
Charge
GND High. SmartStart is Disabled
State While IBAT < IDETECT or When Charging is Stopped
Termination
VCC NC Charges Indefinitely Until CHGEN Pin is Pulled Pull-Down State When Charging. High Impedance State
High. SmartStart is Disabled
When Charging is Stopped
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11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTC4063.PDF ] | |
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