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PDF LTC4089-3 Data sheet ( Hoja de datos )
| Número de pieza | LTC4089-3 | |
| Descripción | USB Power Manager | |
| Fabricantes | Linear | |
| Logotipo |  |
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LTC4089-3
USB Power Manager with
High Voltage Switching Charger
FEATURES
DESCRIPTION
n Seamless Transition Between Power Sources: Li-Ion
Battery, USB, and 6V to 36V External Supply
n High Efficiency 1.2A Charger from 6V to 36V Input
with Adaptive Output Control
n 3.95V Float Voltage Improves Battery Lifespan and
High Temperature Safety Margin
n Load Dependent Charging from USB Input
Guarantees Current Compliance
n 215m Internal Ideal Diode plus Optional External
Ideal Diode Controller Provides Low Loss Power
Path When External Supply/USB Not Present
n Constant-Current/Constant-Voltage Operation with
Thermal Feedback to Maximize Charging Rate
without Risk of Overheating
n Selectable 100% or 20% Current Limit (e.g., 500mA/
100mA) from USB Input
n Preset 3.95V Charge Voltage with ±0.8% Accuracy
n C/10 Charge Current Detection Output
n NTC Thermistor Input for Temperature Qualified
Charging
n Tiny (6mm × 3mm × 0.75mm) 22-Lead DFN Package
APPLICATIONS
n Portable USB Devices—GPS Receivers, Cameras,
MP3 Players, PDAs
The LTC®4089-3 is a USB power manager plus high voltage
Li-Ion battery charger. This device controls the total cur-
rent used by the USB peripheral for operation and battery
charging. Battery charge current is automatically reduced
such that the sum of the load current and the charge cur-
rent does not exceed the programmed input current limit.
The LTC4089-3 also accommodates high voltage power
supplies, such as 12V AC/DC wall adapters, Firewire, or
automotive power.
The LTC4089-3 provides an adaptive output that tracks
the battery voltage for high efficiency charging from the
high voltage input. This 3.95V version of the the standard
LTC4089 is intended for applications which have extended
battery lifetime requirements or those that require high
temperature (approximately >60°C) operation or stor-
age. 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. The charge
current is programmable and an end-of-charge status
output (CHRG) indicates full charge. Also featured are
programmable total charge time, an NTC thermistor input
used to monitor battery temperature while charging and
automatic recharging of the battery.
L, LT, LTC and LTM are registered trademarks and Bat-Track, PowerPath and ThinSOT are
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners. Protected by U.S. Patents including 6522118, 6700364, 7733061.
TYPICAL APPLICATION
HIGH (6V-36V)
VOLTAGE INPUT
5V (NOM)
FROM USB
CABLE VBUS
1µF
4.7µF
0.1µF
HVIN
HVEN
BOOST
0.1µF
SW
HVOUT
IN HVPR
LTC4089-3
OUT
TIMER
BAT
CLPROG GND PROG
2k 100k
10µH
10µF
1k
+
Li-Ion BATTERY
VOUT (TYP)
VBAT + 0.3V
5V
VBAT
TO LDOs
4.7µF REGS, ETC.
AVAILABLE INPUT
HV INPUT
USB ONLY
BAT ONLY
40893 TAO1a
For more information www.linear.com/4089-3
LTC4089 High Voltage
Battery Charger Efficiency
90 CC CURRENT = 970mA
85 NO OUTPUT LOAD
80
FIGURE 10 SCHEMATIC
WITH RPROG = 52k
75
70
65
60
55
50
45
40
2.5
HVIN = 8V
HVIN = 12V
HVIN = 24V
HVIN = 36V
3 3.5 4
BATTERY VOLTAGE (V)
4.5
40893 TA01b
40893f
1
1 page  
LTC4089-3
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise specified.
VFLOAT Load Regulation
4.05 RPROG = 34k
4.00
3.95
3.90
Battery Regulation (Float)
Voltage vs Temperature
3.970 VIN = 5V
3.965 IBAT = 2mA
3.960
3.955
3.950
Battery Current and Voltage
vs Time
5
1.5
4 1.2
VBAT
3
VOUT
VCHRG
0.9
C/10 IBAT
3.945
3.85
3.940
3.80 3.935
3.75 3.930
0 200 400 600 800 1000
–50 –25 0 25 50 75 100
IBAT (mA)
40893 G01
TEMPERATURE (°C)
40893 G02
Charging from USB, IBAT vs VBAT
600 VIN = 5V
VOUT = NO LOAD
500 RPROG = 100k
RCLPROG = 2k
HPWR = 5V
400
Charge Current vs Temperature
(Thermal Regulation)
600
500
400
2 0.6
1 1250mAh
HVIN = 12V
RPROG = 50k
0
0 50
0.3
TERMINATION
100 150
TIME (MIN)
0
200
40893 G03
Ideal Diode Current vs Forward
Voltage and Temperature
(No External Device)
1000
900
VBAT = 3.7V
VIN = 0V
800
700
600
300 300 500
200 200
100
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
VBAT (V)
100 VIN = 5V
VBAT = 3.5V
0 θJA = 50°C/W
–50 –25 0
25 50
75
TEMPERATURE (°C)
40893 G04
Ideal Diode Current vs Forward
Voltage and Temperature with
External Device
5000
4500
4000
VBAT = 3.7V
VIN = 0V
Si2333 PFET
100 125
40893 G05
400
300
200
100
0
0
–50°C
0°C
50°C
100°C
50 100 150 200
VFWD (mV)
40893 G06
High Voltage Regulator Efficiency
vs Output Load
100 FIGURE 10 SCHEMATIC
95 VBAT = 4.21V (IBAT = 0)
90
3500
85
3000
80
2500
75
2000
70
1500
1000
500
0
0
–50°C
0°C
50°C
100°C
20 40 60 80 100
VFWD (mV)
40853 G07
65
60
HVIN = 8V
HVIN = 12V
55
HVIN = 24V
HVIN = 36V
50
0 0.2 0.4 0.6 0.8 1.0
IOUT (A)
40893 G08
For more information www.linear.com/4089-3
40893f
5
5 Page 
LTC4089-3
OPERATION (Refer to Block Diagram)
The LTC4089-3 is a complete PowerPath™ controller
for battery-powered USB applications. The LTC4089-3
is designed to receive power from a low voltage source
(e.g., USB or 5V wall adapter), a high voltage source (e.g.,
Firewire/IEEE1394, automotive battery, 12V wall adapter,
etc.), and a single-cell Li-Ion 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 current 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 (see Figure 1).
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.
The LTC4089-3 also includes a high voltage switching
regulator which has the ability to receive power from a high
voltage input. This input takes priority over the USB VBUS
input (i.e., if both HVIN and IN are present, load current
and charge current will be delivered via the high voltage
path). When enabled, the high voltage regulator regulates
the HVOUT voltage using a 750kHz constant frequency,
current mode regulator. An external PFET between HVOUT
(drain) and OUT (source) is turned on via the HVPR pin
allowing OUT to charge the battery and/or supply power
to the application. The LTC4089-3 maintains approximately
300mV between the OUT pin and the BAT pin.
21 HVIN
Q1
HIGH VOLTAGE
BUCK REGULATOR
4.25V (RISING)
3.15V (FALLING)
+
–
+
–
SW 19
L1
D1
HVOUT 18
C1
HVPR 7
12 IN
ENABLE
USB CURRENT LIMIT
+– 75mV (RISING)
25mV (FALLING)
OUT
CC/CV REGULATOR
CHARGER
25mV
IDEAL
DIODE
BAT
OUT 13
25mV
+
EDA GATE 10
–
BAT 11
Figure 1. Simplified PowerPath Block Diagram
LOAD
+
LI-ION
40893 F01
For more information www.linear.com/4089-3
40893f
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTC4089-3.PDF ] | |
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