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PDF LTC4089-1 Data sheet ( Hoja de datos )
| Número de pieza | LTC4089-1 | |
| Descripción | USB Power Manager | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC4089-1 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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LTC4089-1
USB Power Manager with
High Voltage Switching Charger
FEATURES
■ Seamless Transition Between Power Sources: Li-Ion
Battery, USB, and 6V to 36V External Supply
■ High Efficiency 1.2A Charger from 6V to 36V Input
■ Load Dependent Charging from USB Input
Guarantees Current Compliance
■ 215m Internal Ideal Diode plus Optional External
Ideal Diode Controller Provides Low Loss Power
Path When External Supply/USB Not Present
■ Constant-Current/Constant-Voltage Operation with
Thermal Feedback to Maximize Charging Rate
without Risk of Overheating
■ Selectable 100% or 20% Current Limit (e.g., 500mA/
100mA) from USB Input
■ Preset 4.1V Charge Voltage with 0.8% Accuracy
■ C/10 Charge Current Detection Output
■ NTC Thermistor Input for Temperature Qualified
Charging
■ Tiny (6mm 3mm 0.75mm) 22-Pin DFN Package
APPLICATIOUS
■ Portable USB Devices—GPS Receivers, Cameras,
MP3 Players, PDAs
DESCRIPTIO
The LTC®4089-1 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 LTC4089-1 also accommodates high voltage power
supplies, such as 12V AC-DC wall adapters, FireWire, or
automotive power.
The LTC4089-1 provides a fixed 5V output from the high
voltage input to charge single cell Li-Ion batteries. The
charge current is programmable and an end-of-charge
status output (CHRG) indicates full charge. Also featured
is programmable total charge time, an NTC thermistor
input used to monitor battery temperature while charging
and automatic recharging of the battery.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Burst Mode is a registered trademark of Linear Technology Corporation.
Protected by U.S. Patents including 6522118 and 6700364.
TYPICAL APPLICATIO
HIGH (6V-36V)
VOLTAGE INPUT
5V (NOM)
FROM USB
CABLE VBUS
1F
4.7 F
HVIN
HVEN
BOOST
IN
LTC4089-1
0.1 F
SW
HVOUT
HVPR
OUT
10 H
1k
0.1 F
TIMER
CLPROG GND PROG
BAT
2k 100k
+
Li-Ion BATTERY
10 F
TO LDOs
4.7 F REGS, ETC.
VOUT (TYP)
5V
5V
VBAT
AVAILABLE INPUT
HV INPUT (LTC4089-1)
USB ONLY
BAT ONLY
4089-1 TAO1
LTC4089-1 High Voltage
Battery Charger Efficiency
90 CC CURRENT = 970mA
85 NO OUTPUT LOAD
80
FIGURE 10 SCHEMATIC
WITH RPROG = 52k
75
LTC4089-1
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
4089-1 TA01b
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LTC4089-1
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise specified.
VFLOAT Load Regulation
4.20 RPROG = 34k
4.15
4.10
4.05
Battery Regulation (Float)
Voltage vs Temperature
4.120 VIN = 5V
4.115 IBAT = 2mA
4.110
4.105
4.100
Battery Current and Voltage
vs Time
5
4 VBAT
VOUT
3
VCHRG
IBAT
1500
1200
900
4.095
4.00
4.090
3.95 4.085
3.90 4.080
0 200 400 600 800 1000
–50 –25 0 25 50 75 100
IBAT (mA)
TEMPERATURE (°C)
2 C/10 600
1
1250mAh
CELL
HVIN = 12V
RPROG = 50k
0
0 50
TERMINATION 300
100 150
TIME (MIN)
0
200
4089-1 G01
Charging from USB, IBAT vs VBAT
600 VIN = 5V
VOUT = NO LOAD
500 RPROG = 100k
RCLPROG = 2k
400
4089-1 G02
Charge Current vs Temperature
(Thermal Regulation)
600
500
400
4089-1 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
HPWR = 5V
HPWR = 0V
100
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
VBAT (V)
200
100 VIN = 5V
VBAT = 3.5V
0 θJA = 50°C/W
–50 –25 0
25 50
75
TEMPERATURE (°C)
100 125
400
300
200
100
0
0
–50 C
0C
50 C
100 C
50 100 150
VFWD (mV)
200
4089-1 G04
Ideal Diode Current vs Forward
Voltage and Temperature with
External Device
5000
4500
4000
VBAT = 3.7V
VIN = 0V
Si2333 PFET
4089-1 G05
High Voltage Regulator Efficiency
vs Output Load
100
95 HVIN = 12V
HVIN = 8V
90
4089-1 G06
3500
85
3000
80
2500
2000
75
HVIN = 24V
HVIN = 36V
70
1500
1000
500
0
0
–50°C
0°C
50°C
100°C
20 40 60 80 100
VFWD (mV)
4089-1 G17
65
60
55 FIGURE 10 SCHEMATIC
50 VBAT = 4.11V (IBAT = 0)
0 0.2 0.4 0.6 0.8 1.0
IOUT (A)
4089-1 G09
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OPERATIOU (Refer to Block Diagram)
The LTC4089-1 is a complete PowerPath™ controller
for battery powered USB applications. The LTC4089-1
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
HVIN
Q1
HIGH VOLTAGE
BUCK REGULATOR
4.25V (RISING)
3.15V (FALLING)
+
–
+
–
LTC4089-1
forward biased. The forward biased ideal diode will then
provide the output power to the load from the battery.
The LTC4089-1 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 be-
tween 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 LTC4089-1 provides
a fixed 5V output.
Input Current Limit
Whenever the input power path is enabled (i.e., SUSP =
0V and HVIN = 0V) and power is available at IN, power
is delivered to OUT. The current limit and charger control
circuits of the LTC4089-1 are designed to limit input cur-
rent as well as control battery charge current as a function
PowerPath is a registered trademark of Linear Technology Corporation.
SW L1
D1
HVOUT
C1
HVPR
19
+– 75mV (RISING)
IN
ENABLE
25mV (FALLING)
OUT
USB CURRENT LIMIT
CC/CV REGULATOR
CHARGER
25mV
IDEAL
DIODE
BAT
25mV
+
EDA
–
21 OUT
21 GATE
LOAD
21 BAT
4089-1 F01
+
LI-ION
Figure 1. Simplified PowerPath Block Diagram
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11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTC4089-1.PDF ] | |
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