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PDF LTC4089-5 Data sheet ( Hoja de datos )
| Número de pieza | LTC4089-5 | |
| Descripción | USB Power Manager | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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www.DataSheet4U.com
LTC4089/LTC4089-5
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
with Adaptive Output Control (LTC4089)
■ 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 4.2V 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
U
APPLICATIO S
■ Portable USB Devices—GPS Receivers, Cameras,
MP3 Players, PDAs
DESCRIPTIO
The LTC®4089/LTC4089-5 are USB power managers plus
high voltage Li-Ion battery chargers. These devices control
the total current used by the USB peripheral for operation
and battery charging. Battery charge current is automati-
cally reduced such that the sum of the load current and
the charge current does not exceed the programmed input
current limit. The LTC4089/LTC4089-5 also accommodate
high voltage power supplies, such as 12V AC-DC wall
adapters, FireWire, or automotive power.
The LTC4089 provides an adaptive output that tracks the
battery voltage for high efficiency charging from the high
voltage input. The LTC4089-5 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
HVIN
BOOST
1µF HVEN
4.7µF
IN
LTC4089
0.1µF
SW
HVOUT
HVPR
OUT
10µH
1k
0.1µF
TIMER
CLPROG GND PROG
BAT
2k 100k
+
Li-Ion BATTERY
LTC4089 High Voltage
Battery Charger Efficiency
10µF
90
CC CURRENT = 970mA
85 NO OUTPUT LOAD
FIGURE 10 SCHEMATIC
80 WITH RPROG = 52k
LTC4089
75
70
TO LDOs
4.7µF REGS, ETC.
65
60
LTC4089-5
55
50
VOUT (TYP)
VBAT +0.3V
5V
5V
VBAT
45
AVAILABLE INPUT
HV INPUT (LTC4089)
40
2.5
HV INPUT (LTC4089-5)
USB ONLY
BAT ONLY
4089 TAO1
HVIN = 8V
HVIN = 12V
HVIN = 24V
HVIN = 36V
3 3.5 4
BATTERY VOLTAGE (V)
4.5
4089 TA01b
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LTC4089/LTC4089-5
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise specified.
VFLOAT Load Regulation
4.30
RPROG = 34k
4.25
4.20
Battery Regulation (Float)
Voltage vs Temperature
4.220
VIN = 5V
4.215 IBAT = 2mA
4.210
4.205
4.15 4.200
4.195
4.10
4.190
4.05
4.185
4.00 4.180
0 200 400 600 800 1000
–50 –25 0 25 50 75 100
IBAT (mA)
TEMPERATURE (°C)
40895 G01
40895 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
300 300
200
HPWR = 0V
100
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
VBAT (V)
40895 G04
Ideal Diode Current vs Forward
Voltage and Temperature with
External Device
5000
4500
4000
VBAT = 3.7V
VIN = 0V
Si2333 PFET
3500
3000
2500
2000
1500
1000
500
0
0
–50°C
0°C
50°C
100°C
20 40 60 80 100
VFWD (mV)
4085 G17
200
100 VIN = 5V
VBAT = 3.5V
θJA = 50°C/W
0
–50 –25 0
25 50
75
TEMPERATURE (°C)
100 125
40895 G05
LTC4089 High Voltage Regulator
Efficiency vs Output Load
100
95 HVIN = 12V
HVIN = 8V
90
85
80
75
HVIN = 24V
HVIN = 36V
70
65
60
55 FIGURE 10 SCHEMATIC
VBAT = 4.21V (IBAT = 0)
50
0 0.2 0.4 0.6 0.8 1.0
IOUT (A)
40895 G08
Battery Current and Voltage vs
Time (LTC4089)
5
1500
4
VBAT
1200
VOUT
VCHRGB
3 IBAT 900
2 600
C/10
1250mAh
1 CELL
HVIN = 12V
RPROG = 50k
0
0 50
TERMINATION 300
100 150
TIME (MIN)
0
200
40895 G03
Ideal Diode Current vs Forward
Voltage and Temperature (No
External Device)
1000
VBAT = 3.7V
900 VIN = 0V
800
700
600
500
400
300
200
100
0
0
–50°C
0°C
50°C
100°C
50 100 150
VFWD (mV)
200
40895 G06
LTC4089-5 High Voltage
Regulator Efficiency vs Output
Load
100
95 HVIN = 12V
HVIN = 8V
90
85
80
75 HVIN = 24V HVIN = 36V
70
65
60
55 FIGURE 10 SCHEMATIC
VBAT = 4.21V (IBAT = 0)
50
0 0.2 0.4 0.6 0.8 1.0
IOUT (A)
40895 G09
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U
OPERATIO (Refer to Block Diagram)
The LTC4089/LTC4089-5 is a complete PowerPath™
controller for battery powered USB applications. The
LTC4089/LTC4089-5 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 bat-
tery, 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 pres-
ent). 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/LTC4089-5
forward biased. The forward biased ideal diode will then
provide the output power to the load from the battery.
The LTC4089/LTC4089-5 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 maintains
approximately 300mV between the OUT pin and the BAT
pin, while the LTC4089-5 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/LTC4089-5 are designed to limit
PowerPath is a registered trademark of Linear Technology Corporation.
SW L1
D1
HVOUT
C1
HVPR
19
75mV (RISING)
+– 25mV (FALLING)
IN ENABLE
OUT
USB CURRENT LIMIT
CC/CV REGULATOR
CHARGER
25mV
IDEAL
DIODE
BAT
25mV
+
EDA
–
OUT
21
GATE
21
LOAD
BAT
21
4089 F01
+
LI-ION
Figure 1. Simplified PowerPath Block Diagram
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11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTC4089-5.PDF ] | |
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