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PDF LTC4077 Data sheet ( Hoja de datos )
| Número de pieza | LTC4077 | |
| Descripción | Dual Input Standalone Li-Ion Battery Charger | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
■ Charges Single-Cell Li-Ion Batteries from Wall
Adapter and USB Inputs
■ Automatic Input Power Detection and Selection
■ Charge Current Programmable up to 950mA from
Wall Adapter Input
■ C/10 Charge Current Termination
■ Thermal Regulation Maximizes Charge Rate
Without Risk of Overheating*
■ Preset Charge Voltage with ±0.6% Accuracy
■ 18µA USB Suspend Current in Shutdown
■ Power Present Status Output
■ Charge Status Output
■ Automatic Recharge
■ Available in a Thermally Enhanced, Low Profile
(0.75mm) 10-Lead (3mm × 3mm) DFN Package
U
APPLICATIO S
■ Cellular Telephones
■ Handheld Computers
■ Portable MP3 Players
■ Digital Cameras
LTC4077www.DataSheet4U.com
Dual Input Standalone
Li-Ion Battery Charger
DESCRIPTIO
The LTC®4077 is a standalone linear charger that is capable
of charging a single-cell Li-Ion battery from both wall
adapter and USB inputs. The charger can detect power at
the inputs and automatically select the appropriate power
source for charging.
No external sense resistor or blocking diode is required
for charging due to the internal MOSFET architecture.
Internal thermal feedback regulates the battery charge
current 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. The LTC4077
terminates the charge cycle when the charge current drops
below the termination threshold after the final float voltage
is reached. The LTC4077 can be put into shutdown mode
reducing the DCIN supply current to 20µA, the USBIN
supply current to 10µA, and the battery drain current to
less than 2µA even with power applied to both inputs.
Other features include automatic recharge, undervoltage
lockout, charge status output, power present status output
to indicate the presence of wall adapter or USB power and
high power/low power adjustable mode for USB compat-
ible applications.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Protected by U.S. patents, including 6522118
TYPICAL APPLICATIO
Dual Input Battery Charger for Single-Cell Li-Ion
WALL
ADAPTER
USB
PORT
1mF
LTC4077
DCIN
BAT
USBIN HPWR
1mF IUSB
2k IDC IUSBL
1% 1.24k
GND
1%
800mA (WALL)
500mA (USB)
+ 4.2V
SINGLE CELL
Li-Ion BATTERY
2k
1%
4077 TA01
Complete Charge Cycle (1100mAh Battery)
1000
800
600
400
200
0
4.2
4.0
3.8
3.6
3.4
5.0
2.5
0
CONSTANT VOLTAGE
USBIN = 5V
TA = 25°C
RIDC = 1.24k
RIUSB = 2k
HPWR = 5V
0 0.5 1.0 1.5 2.0 2.5 3.0
TIME (HR)
" %% 6) >
4077f
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
LTC4077www.DataSheet4U.com
⎯C⎯H⎯R⎯G Pin I-V Curve
35
VDCIN = VUSBIN = 5V
30
25
20
TA = – 40°C
TA = 25°C
TA = 90°C
15
10
5
0
01
2 34 5
VCHRG (V)
67
4077 G08
Charge Current vs Battery Voltage
1000
800
600
400
200 VDCIN = VUSBIN = 5V
θJA = 40°C/W
RIDC = 1.25k
0
2.4 2.7 3.0 3.3 3.6 3.9 4.2 4.5
VBAT (V)
4077 G11
EN Pin Threshold (Rising) vs
Temperature
900
VDCIN = VUSBIN = 5V
850
800
750
700
650
600
–50 –25
0 25 50
TEMPERATURE (°C)
75 100
4077 G14
Charge Current vs Ambient
Temperature
1000
ONSET OF
THERMAL REGULATION
800
RIDC = 1.25k
600
400 RIDC = RIUSB = 2k
HPWR = 5V
200 VDCIN = VUSBIN = 5V
VBAT = 4V
θJA = 40°C/W
0
–50 –25 0 25
50
75
TEMPERATURE (°C)
100 125
4077 G09
DCIN Power FET “On” Resistance
vs Temperature
550
VBAT = 4V
IBAT = 200mA
500
450
400
350
300
250
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4077 G12
HPWR Pin Threshold (Rising) vs
Temperature
900
VDCIN = VUSBIN = 5V
850
800
750
700
650
600
–50 –25
0 25 50
TEMPERATURE (°C)
75 100
4077 G15
Charge Current vs Supply Voltage
900
ONSET OF
THERMAL REGULATION
800
700
600
500
400
RIDC = 1.25k
VBAT = 4V
θJA = 35°C/W
300
4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0
VDCIN (V)
4077 G10
USBIN Power FET “On” Resistance
vs Temperature
800
VBAT = 4V
750 IBAT = 200mA
HPWR = 5V
700
650
600
550
500
450
400
350
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4077 G13
DCIN Shutdown Current vs
Temperature
50
45
40
VDCIN = 8V
35
30
25
VDCIN = 5V
20
15
VDCIN = 4.3V
10
5
0
–50 –25
EN = 5V
0 25 50 75
TEMPERATURE (°C)
100
4077 G16
4077f
5
5 Page 
U
OPERATIO
Status Indicators
The charge status output (C⎯ H⎯ R⎯ G⎯ ) has two states: pull-down
and high impedance. The pull-down state indicates that
the LTC4077 is in a charge cycle. Once the charge cycle
has terminated or the LTC4077 is disabled, the pin state
becomes high impedance. The pull-down state is capable
of sinking up to 10mA.
LTC4077www.DataSheet4U.com
The power supply status output (⎯P⎯W⎯R) has two states:
pull-down and high impedance. The pull-down state
indicates that power is present at either DCIN or USBIN.
If no power is applied at either pin, the ⎯P⎯W⎯R pin is high
impedance, indicating that the LTC4077 lacks sufficient
power to charge the battery. The pull-down state is capable
of sinking up to 10mA.
STARTUP
BAT < 2.9V
DCIN POWER APPLIED
ONLY USB POWER APPLIED
POWER SELECTION
TRICKLE CHARGE
MODE
1/10th FULL CURRENT
CHRG STATE: PULLDOWN
DCIN POWER
REMOVED
USBIN POWER
REMOVED OR
DCIN POWER
APPLIED
TRICKLE CHARGE
MODE
1/2 OR 1/10th FULL CURRENT
CHRG STATE: PULLDOWN
BAT < 2.9V
BAT > 2.9V
BAT > 2.9V
2.9V < BAT
CHARGE
MODE
FULL CURRENT
CHRG STATE: PULLDOWN
IBAT < ITERMINATE
IN VOLTAGE MODE
CHARGE
MODE
FULL CURRENT
CHRG STATE: PULLDOWN
2.9V < BAT
IBAT < ITERMINATE
IN VOLTAGE MODE
BAT < 4.1V
STANDBY
MODE
NO CHARGE CURRENT
CHRG STATE: Hi-Z
STANDBY
MODE
NO CHARGE CURRENT
CHRG STATE: Hi-Z
BAT < 4.1V
EN
DRIVEN LOW
SHUTDOWN
MODE
IDCIN DROPS TO 20mA
CHRG STATE: Hi-Z
EN
DRIVEN HIGH
DCIN POWER
REMOVED
EN
DRIVEN HIGH
USBIN POWER
REMOVED OR
DCIN POWER
APPLIED
SHUTDOWN
MODE
IUSBIN DROPS TO 18mA
CHRG STATE: Hi-Z
EN
DRIVEN LOW
4075 F01
Figure 1. LTC4077 State Diagram of a Charge Cycle
4077f
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC4077.PDF ] | |
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