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PDF LTC4067 Data sheet ( Hoja de datos )
| Número de pieza | LTC4067 | |
| Descripción | USB Power Manager | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC4067 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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LTC4067www.DataSheet4U.com
USB Power Manager
with OVP and
Li-Ion/Polymer Charger
FEATURES
Programmable Input Current Limit:
■ Single Resistor at CLPROG Pin to Set and Monitor
Input Current
Battery Charger/Ideal Diode/Controller:
■ 13V Overvoltage Protection
■ Full Featured Battery Charger with 4.2V Float
■ Up to 1.25A Programmable Charge Current
■ Thermal Regulation Maximizes Charge Current
Without Risk of Overheating
■ Internal 2 Hour Termination Timer from Onset of
Voltage Mode Charging
■ Automatic Load Switchover to Battery Power with
Internal Ideal Diode and Drive Output for Optional
External MOSFET
■ NTC Thermistor Input
■ Bad Battery Time-Out Detection
■ 4mm × 3mm 12-Lead DFN Package
U
APPLICATIO S
■ Automatic Battery Charging/Load Switchover
■ Backup Battery Charger
■ Uninterrupted Supplies
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
DESCRIPTIO
The LTC®4067 is a USB power management and Li-Ion/
Polymer battery charger designed for portable battery
powered applications. The part controls total current used
by the USB peripheral for operation and battery charging.
The total input current may be left unregulated, or it may
be limited to 20% or 100% of the programmed value up
to 1.5A (typically 500mA). Battery charge current is au-
tomatically reduced such that the sum of the load current
and the charge current does not exceed the programmed
input current.
With the addition of an external P-channel MOSFET the
LTC4067 can withstand voltages up to 13V.
The LTC4067 includes a complete constant current/con-
stant voltage linear charger for single cell Li-Ion batteries.
The float voltage applied to the battery is held to a tight
0.4% tolerance, and charge current is programmed using
an external resistor to ground. An end-of-charge status
output, ⎯C⎯H⎯R⎯G, indicates full charge. Also featured is an
NTC thermistor input used to monitor battery temperature
while charging.
The LTC4067 is available in a 12-lead low profile 4mm ×
3mm DFN package.
TYPICAL APPLICATIO
WALL
OR
USB
10nF
OVI
OVP
OUT
ILOAD
10μF
IN BAT
1μF
10μF
LTC4067
1-CELL
Li-Ion
ILIM0
CHRG
ILIM1
PROG
CLPROG GND
2k 4067 TA01
ILIM0 ILIM1 IIN(MAX)
L H O (SUSPEND)
L L 200V/RCLPROG
2k H H 1000V/RCLPROG
H L FIXED (2A)
OVP Response to Ramp Input at OVI
VOVI
5V/DIV
5V TO 12V
IIN
500mA/DIV
VOUT
5V/DIV
VOVP
5V/DIV
VBAT = 4.2V
1ms/DIV
4067 TA01b
4067f
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
LTC4067www.DataSheet4U.com
Input Supply Current vs
Temperature (Shutdown Mode)
16
14
12
10
8
6
4
2
0
–50 –30 –10 10 30 50 70 90 110 130 150
TEMPERATURE (°C)
4067 G01
Input Supply Current vs
Temperature (Suspend Mode)
90
80
70
60
50
40
30
20
10
0
–50 –30 –10 10 30 50 70 90 110 130 150
TEMPERATURE (°C)
4067 G02
Input Supply Current vs
Temperature
450
400
350
300
250
CHARGER ENTERS
THERMAL REGULATION
200
150
100
50
0
–50 –30 –10 10 30 50 70 90 110 130 150
TEMPERATURE (°C)
4067 G03
Battery Current vs Temperature
90 IN = OUT = FLOAT
80 VBAT = 3.7V
70
60
50
40
30
20
10
0
–50 –30 –10 10 30 50 70 90 110 130 150
TEMPERATURE (°C)
4067 G04
Battery Current vs Temperature
(Shutdown)
12
10
8
6
4
2
0
–50 –30 –10 10 30 50 70 90 110 130 150
TEMPERATURE (°C)
4067 G09
Input Current Limit vs
Temperature (High Power)
510
VCLPROG
505
1010
500
ILIM
495
1000
490 990
485
480
–50 –25
980
0 25 50 75 100 125 150
TEMPERATURE (°C)
4067 G05
Input Current Limit vs
Temperature (Low Power)
102
VCLPROG
100
204
200
98 196
ILIM
96 192
94 188
92 184
90
–50 –25
0 25 50 75
TEMPERATURE (°C)
180
100 125
4067 G06
VCLPROG vs Temperature
at IIN = 500mA
1000
HPWR
800
600
VOUT = 4V
400
RCLPROG = 2k
IOUT = 200mA
200
LPWR
0
–50 –30 –10 10 30 50 70 90 110 130 150
TEMPERATURE (°C)
4067 G07
RON vs Temperature
240 VIN = 4.45V
220
RCLPROG = 0k
HPWR
200
180
160
140
120
100
–50 –25
RON, 1A
RON, 500mA
RON, 200mA
RON, 100mA
0 25 50 75
TEMPERATURE (°C)
100 125
4067 G08
4067f
5
5 Page 
U
OPERATIO
Introduction
The LTC4067 is a complete PowerPath controller for bat-
tery powered USB applications. The LTC4067 is designed
to receive power from a USB source (or 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 the load current does
not exceed the programmed input current limit.
An internal ideal diode function provides power from the
battery when output/load current exceeds the input cur-
rent limit or when the 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.
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.
Finally, the LTC4067 provides overvoltage controller circuitry
which, when used in conjunction with an external P-channel
MOSFET, will protect against overvoltage damage if a wall
adapter with greater than 6V output is used. The circuit will
tolerate input voltages up to 13V without damage.
USB PowerPath Controller
The input current limit and charge control circuits of the
LTC4067 are designed to limit input current as well as
control battery charge current as a function of IOUT. OUT
drives the combination of the external load and the bat-
tery charger.
LTC4067www.DataSheet4U.com
If the combined load does not exceed the programmed
input current limit, OUT will be connected to IN through
an internal 200mΩ P-channel MOSFET.
If the combined load at OUT exceeds the programmed input
current limit, the battery charger will reduce its charge
current by the amount necessary to enable the external
load to be satisfied while maintaining the programmed
input current. Even if the battery charge current is set to
exceed the allowable USB current, the USB specification
will not be violated. The input current limit will ensure that
the USB specification is never violated. Furthermore, load
current at OUT will always be prioritized and only excess
available current will be used to charge the battery.
The current out of the CLPROG pin is a fraction (1/1000th)
of the IN current. When a programming resistor is con-
nected from CLPROG to GND, the voltage on CLPROG
represents the input current:
IIN
=
VCLPROG
RCLPROG
• 1000
The input current limit is programmed by the ILIM0 and
ILIM1 pins (see Table 1 in PIN FUNCTIONS). The LTC4067
can be configured to limit input current to one of several
possible settings as well as be deactivated (USB suspend).
The input current limit will be set by the appropriate servo
voltage and the resistor on CLPROG according to the fol-
lowing expressions:
ILIM (A) = 0 (SUSPEND)
ILIM
=
200V
RCLPROG
(Low
Power)
ILIM
=
1000V
RCLPROG
(High
Power)
ILIM (A) = 2A (CLDIS)
Under worst-case conditions, the USB specification will
not be violated with an RCLPROG of greater than 2.1k.
Current Limit Disable (CLDIS)
When ILIM1 is low and ILIM0 is high, the input current limit
is set to a higher current limit for increased charging and
4067f
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTC4067.PDF ] | |
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