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PDF LTC4098-3.6 Data sheet ( Hoja de datos )
| Número de pieza | LTC4098-3.6 | |
| Descripción | USB Compatible Switching Power Manager/LiFePO4 Charger | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC4098-3.6 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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Features
LTC4098-3.6www.DataSheet4U.com
USB Compatible Switching
Power Manager/LiFePO4 Charger
with Overvoltage Protection
Description
n Switching Regulator with Bat-TrackTM Adaptive
Output Control Makes Optimal Use of Limited
Power Available from USB Port to Charge Battery
and Power Application
n Charge Control Algorithm Specifically Designed
for LiFePO4 (Lithium Iron Phosphate)
n Overvoltage Protection Guards Against Damage
n Bat-Track External Step-Down Switching Regulator
Control Maximizes Efficiency from Automotive,
Firewire and Other High Voltage Input Sources
n 180mΩ Internal Ideal Diode Plus External Ideal Diode
Controller Seamlessly Provide Low Loss PowerPathTM
When Input Power Is Limited or Unavailable
n Preset 3.6V Charge Voltage with 0.5% Accuracy
n Instant-On Operation with Discharged Battery
n 700mA Maximum Load Current from USB Port
n 2A Maximum Input Current from Internal Switching
Regulator
n 1.5A Maximum Charge Current with Thermal Limiting
n 20-Lead 3mm × 4mm × 0.75mm QFN Package
Applications
n High Peak Power Battery-Powered Equipment
n Backup Applications
n High Reliability Handhelds
The LTC®4098-3.6 is a high efficiency USB PowerPath
controller and full-featured LiFePO4 battery charger. It seam-
lessly manages power distribution from multiple sources
including USB, wall adapter, automotive, Firewire or other
high voltage DC/DC converters, and a LiFePO4 battery.
The LTC4098-3.6 charge algorithm is optimized for LiFePO4
by implementing a 1-hour float voltage termination timer
and a 0°C to 60°C NTC-based charge qualification range.
Furthermore, completely discharged batteries are charged
at the full programmed charge current.
The LTC4098-3.6’s switching regulator can automatically
limit its input current for USB compatibility. For automo-
tive and other high voltage applications, the LTC4098‑3.6
interfaces with an external switching regulator. Both the
USB input and the auxiliary input controller feature Bat-
Track optimized charging to provide maximum power to
the application and reduced heat in high power density ap-
plications with input supplies from 5V to as high as 38V.
An overvoltage protection circuit guards the LTC4098-3.6
from high voltage damage on the VBUS pin with just two
external components.
The LTC4098-3.6 is available in a 20-lead 3mm × 4mm ×
0.75mm QFN surface mount package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
Bat Track and PowerPath are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
Typical Application
High Efficiency USB Compatible LiFePO4 Battery Charger with Overvoltage Protection
5V/USB
VBUS
10µF
3.3µH
SW
SYSTEM
LOAD
TO µC
6.04k
OVGATE LTC4098-3.6
VOUT
OVSENS
3
D0-D2
BAT
CLPROG PROG GND BATSENS
10µF
0.1µF 3.01k 500Ω
+ LiFePO4
409836 TA01a
Reduced Power Dissipation
vs Linear Battery Charger
3.0 VIN = 5V
2.5
LINEAR BATTERY
CHARGER
PROG = 500Ω
ICHRG = 1.1A
10x MODE
2.0
ADDITIONAL POWER
1.5 AVAILABLE FOR CHARGING
1.0
SWITCHING
0.5
BATTERY
CHARGER
0
2.70
2.85 3.00 3.15 3.30 3.45 3.60
BATTERY VOLTAGE (V)
409836 TA01b 409836f
1 page  
LTC4098-3.6www.DataSheet4U.com
TYPICAL PERFORMANCE Characteristics TA = 25°C, unless otherwise noted.
Ideal Diode V-I Characteristics
1.0
INTERNAL IDEAL DIODE
WITH SUPPLEMENTAL
0.8
EXTERNAL VISHAY
Si2333 PMOS
0.6
INTERNAL IDEAL
DIODE ONLY
0.4
0.2
0
0 0.04 0.08 0.12 0.16 0.20
FORWARD VOLTAGE (V)
409836 G01
Ideal Diode Resistance
vs Battery Voltage
0.25
0.20
INTERNAL IDEAL
DIODE
0.15
0.10
0.05
0
2.7
INTERNAL IDEAL DIODE
WITH SUPPLEMENTAL
EXTERNAL VISHAY
Si2333 PMOS
3.0 3.3 3.6 3.9 4.2
BATTERY VOLTAGE (V)
409836 G02
USB Compliant Load Current
Available Before Discharging Battery
750
700
650
600
VBUS = 5V
RCLPROG = 3.01k
550 5x USB SETTING
2.7 3.0
3.3
BATTERY VOLTAGE (V)
3.6
409836 G03
VOUT Voltage vs VOUT Current
(Battery Charger Disabled)
4.25
4.00 BAT = 3.6V
3.75 BAT = 3.3V
3.50
3.25
VBUS = 5V
5x USB SETTING
3.00
0 200
400
600
OUTPUT CURRENT (mA)
800
409836 G04
V(BOaUtTteVroylCtahgaergvesrVEOnUaTbCleudr)rent
3.75
3.50
3.25
3.00
VBUS = 5V
BAT = 3V
RCLPROG = 3.01k
RPROG = 2k
5x USB SETTING
2.75
0
200
400
600
OUTPUT CURRENT (mA)
800
409836 G05
Battery Charge Current vs VOUT
Current (Battery Charger Enabled)
600
450
300
150
0 VBUS = 5V
BAT = 3V
–150 RCLPROG = 3.01k
RPROG = 2k
5x USB SETTING
–300
0
200
400
600
OUTPUT CURRENT (mA)
800
409836 G06
USB Compliant Load Current
Available Before Discharging Battery
150
140
130
120
VBUS = 5V
RCLPROG = 3.01k
1x USB SETTING
110
2.7 3.0
3.3
BATTERY VOLTAGE (V)
3.6
409836 G07
USB Limited Battery Charge
Current vs Battery Voltage
700
600
500
400
300
200
VBUS = 5V
100
RPROG = 1k
RCLPROG = 3.01k
0 5x USB SETTING
2.7 3.0
3.3
BATTERY VOLTAGE (V)
3.6
409836 G08
USB Limited Battery Charge
Current vs Battery Voltage
140
120
100
80
60
40
VBUS = 5V
20
RPROG = 1k
RCLPROG = 3.01k
0 1x USB SETTING
2.7 3.0
3.3
BATTERY VOLTAGE (V)
3.6
409836 G09
409836f
5 Page 
BLOCK DIAGRAM
LTC4098-3.6www.DataSheet4U.com
409836f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC4098-3.6.PDF ] | |
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