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PDF LTC4085-1 Data sheet ( Hoja de datos )
| Número de pieza | LTC4085-1 | |
| Descripción | USB Power Manager | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC4085-1
FEATURES
USB Power Manager with
Ideal Diode Controller and
4.1V Li-Ion Charger
DESCRIPTIO
■ Seamless Transition Between Input Power Sources:
Li-Ion Battery, USB and 5V Wall Adapter
■ 215mΩ Internal Ideal Diode Plus Optional External
Ideal Diode Controller Provide Low Loss PowerPathTM
When Wall Adapter/USB Input Not Present
■ Load Dependent Charging Guarantees Accurate USB
Input Current Compliance
■ 4.1V Float Voltage Improves Battery Life Span and
High Temperature Safety Margin
■ Constant-Current/Constant-Voltage Operation with
Thermal Feedback to Maximize Charging Rate Without
Risk of Overheating*
■ Selectable 100% or 20% Input Current Limit
(e.g., 500mA/100mA)
■ Battery Charge Current Independently Programmable
Up to 1.2A
■ Preset 4.1V Charge Voltage with 0.8% Accuracy
■ C/10 Charge Current Detection Output
■ Tiny (4mm × 3mm × 0.75mm) 14-Lead DFN Package
U
APPLICATIO S
■ Portable USB Devices: Cameras, MP3 Players, PDAs
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents, including 6522118, 6700364.
Other patents pending.
The LTC®4085-1 is a USB power manager and Li-Ion
battery charger designed for portable battery-powered
applications. The part controls the total current used by
the USB peripheral for operation and battery charging.
The total input current can be limited to 20% or 100%
of a programmed value up to 1.5A (typically 100mA or
500mA). Battery charge current is automatically reduced
such that the sum of the load current and charge current
does not exceed the programmed input current limit.
The LTC4085-1 includes a complete constant-current/
constant-voltage linear charger for single cell Li-Ion batter-
ies. This 4.1V version of the standard LTC4085 is intended
for applications which will be operated or stored above
approximately 60°C. 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, and avoids open CID (pressure fuse)
in cylindrical cells.
The LTC4085-1 also includes a programmable termina-
tion timer, automatic recharging, an end-of-charge status
output and an NTC thermistor.
The LTC4085-1 is available in a 14-lead low profile 4mm
× 3mm DFN package.
TYPICAL APPLICATIO
5V WALL
ADAPTER
INPUT
5V (NOM)
FROM USB
CABLE VBUS
IIN
4.7μF SUSPEND USB POWER
100mA 500mA SELECT
IN
SUSP
HPWR
WALL
ACPR
OUT
PROG LTC4085-1 GATE
CLPROG
BAT
NTC CHRG
VNTC
10k
GND TIMER
100k 2k
10k
ILOAD
TO LDOs,
REGs, ETC
1k 4.7μF
510Ω
*
+
0.1μF
IBAT
* OPTIONAL - TO LOWER
IDEAL DIODE IMPEDANCE
40851 TA01
Input and Battery Current vs Load Current
RPROG = 100k, RCLPROG = 2k
600
IIN
500
400
ILOAD
300
200 IBAT
(CHARGING)
100
0
WALL = 0V
–100
0 100 200
IBAT
(DISCHARGING)
300 400 500
600
ILOAD (mA)
40851 TA01b
40851f
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LTC4085-1
TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise noted.
Input Supply Current
vs Temperature
900
VIN = 5V
800 VBAT = 4.2V
RPROG = 100k
700 RCLPROG = 2k
600
500
400
300
200
100
0
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
40851 G01
Input Supply Current vs
Temperature (Suspend Mode)
70
VIN = 5V
60
VBAT = 4.2V
RPROG = 100k
RCLPROG = 2k
50 SUSP = 5V
40
30
20
10
0
–50 25
0 25 50
TEMPERATURE (°C)
75 100
40851 G02
Battery Drain Current
vs Temperature
(BAT Powers OUT, No Load)
100 VIN = 0V
90 VBAT = 4.2V
80
70
60
50
40
30
20
10
0
–50 –25 0 25 50 75 100
TEMPERATURE (°C)
40851 G03
Input Current Limit
vs Temperature, HPWR = 5V
525
VIN = 5V
VBAT = 3.7V
515
RPROG = 100k
RCLPROG = 2k
505
495
485
475
–50 –25
0
25 50
TEMPERATURE (°C)
75 100
40851 G04
Input Current Limit
vs Temperature, HPWR = 0V
110
VIN = 5V
108 VBAT = 3.7V
106
RPROG = 100k
RCLPROG = 2k
104
102
100
98
96
94
92
90
–50 –25
0
25 50 75 100
TEMPERATURE (°C)
40851 G05
CLPROG Pin Voltage
vs Temperature
1.2
VIN = 5V
RCLPROG = 2k
1.0
HPWR = 5V
0.8
0.6
0.4
HPWR = 0V
0.2
0
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
40851 G06
PROG Pin Voltage
vs Temperature
1.020
1.015
1.010
VIN = 5V
VBAT = 4.2V
RPROG = 100k
RCLPROG = 2k
1.005
1.000
0.995
0.990
0.985
0.980
–50 –25
0
25 50 75
TEMPERATURE (°C)
100
40851 G07
VFLOAT Load Regulation
4.20
RPROG = 34k
4.15
4.10
4.05
4.00
3.95
3.90
0 200 400 600 800 1000
IBAT (mA)
40851 G08
Battery Regulation (Float)
Voltage vs Temperature
4.120 VIN = 5V
4.115 IBAT = 2mA
4.110
4.105
4.100
4.095
4.090
4.085
4.080
–50 –25 0
25 50 75 100
TEMPERATURE (°C)
40851 G09
40851f
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U
OPERATIO
The LTC4085-1 is a complete PowerPath controller for
battery powered USB applications. The LTC4085-1 is de-
signed to receive power from a USB source, a wall adapter,
or a battery. It can then deliver power to an application
connected to the OUT pin and a battery connected to the
BAT pin (assuming that an external supply other than the
battery is present). Power supplies that have limited cur-
rent resources (such as USB VBUS supplies) should be
connected to the IN pin which has a programmable current
limit. Battery charge current will be adjusted to ensure that
the sum of the charge current and load current does not
exceed the programmed input current limit.
An ideal diode function provides power from the battery
when output/load current exceeds the input current limit or
when input power is removed. Powering the load through
the ideal diode instead of connecting the load directly to
the battery allows a fully charged battery to remain fully
charged until external power is removed. Once external
power is removed the output drops until the ideal diode is
forward biased. The forward biased ideal diode will then
provide the output power to the load from the battery.
LTC4085-1
Furthermore, powering switching regulator loads from the
OUT pin (rather than directly from the battery) results in
shorter battery charge times. This is due to the fact that
switching regulators typically require constant input power.
When this power is drawn from the OUT pin voltage (rather
than the lower BAT pin voltage) the current consumed
by the switching regulator is lower leaving more current
available to charge the battery.
The LTC4085-1 also has the ability to receive power from
a wall adapter. Wall adapter power can be connected to
the output (load side) of the LTC4085-1 through an ex-
ternal device such as a power Schottky or FET, as shown
in Figure 1. The LTC4085-1 has the unique ability to use
the output, which is powered by the wall adapter, as a
path to charge the battery while providing power to the
load. A wall adapter comparator on the LTC4085-1 can
be configured to detect the presence of the wall adapter
and shut off the connection to the USB to prevent reverse
conduction out to the USB bus.
40851f
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11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTC4085-1.PDF ] | |
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