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PDF LTC4098 Data sheet ( Hoja de datos )
| Número de pieza | LTC4098 | |
| Descripción | USB Compatible Switching Power Manager/Li-Ion Charger | |
| Fabricantes | Linear Technology Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC4098 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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LTC4098/LTC4098-1
USB Compatible Switching
Power Managers/Li-Ion Chargers
with Overvoltage Protection
FEATURES
n Switching Regulator with Bat-Track™ Adaptive
Output Control Makes Optimal Use of Limited
Power Available from USB Port to Charge Battery
and Power Application
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 PowerPath™
when Input Power is Limited or Unavailable
n Preset 4.2V Charge Voltage with 0.5% Accuracy
(4.1V for LTC4098-1)
n 4.1V Float Voltage (LTC4098-1) Improves Battery Life
and High Temperature Safety Margin
n Instant-On Operation with Discharged Battery
n 700mA Maximum Load Current from USB Port
n 1.5A Maximum Charge Current with Thermal Limiting
n 20-Lead 3mm × 4mm × 0.75mm QFN Package
APPLICATIONS
n Media Players
n GPS
n PDAs
n Smart Phones
DESCRIPTION
The LTC®4098/LTC4098-1 are high efficiency USB Power-
Path controllers and full-featured Li-Ion/Polymer battery
chargers. They seamlessly manage power distribution from
multiple sources including USB, wall adapter, automotive,
Firewire or other high voltage DC/DC converters, and a
Li-Ion/Polymer battery.
The LTC4098/LTC4098-1’s internal switching regulator
automatically limits its input current for USB compatibility.
For automotive and other high voltage applications, the
LTC4098/LTC4098-1 interface with a Linear Technology
external switching regulator to provide a high efficiency
high voltage power path. Both the USB and the optional
high voltage inputs feature Bat-Track optimized charging
to provide maximum power to the application and ease
thermal issues in high power density applications with
input supplies from 5V to as high as 38V.
An overvoltage circuit protects the LTC4098/LTC4098-1
from high voltage damage on the USB/wall adaptor inputs
with an N-channel FET and a resistor.
The LTC4098/LTC4098-1 are 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/Automotive Battery Charger with Overvoltage Protection
INPUT
AUTOMOTIVE,
FIREWIRE, ETC.
INPUT
USB
TO μC
LT3653
3.3μH
VBUS
10μF
VC WALL
SW
6.04k
OVGATE
LTC4098/LTC4098-1
OVSENS
3
D0-D2
VOUT
BAT
CLPROG PROG GND BATSENS
SYSTEM
LOAD
10μF
0.1μF 3.01k 1k
+
Li-Ion
40981 TA01a
USB Switching Regulator Efficiency
to System Load (PVOUT/PVBUS)
100
90
80
70 BAT = 4.2V
60
BAT = 3.3V
50
40
30
20 VBUS = 5V
10 IBAT = 0mA
10x MODE
0
0.01
0.1
IVOUT (A)
1
40981 TA01b
40981fc
1
1 page  
LTC4098/LTC4098-1
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)
40981 G01
VOUT Voltage vs VOUT Current
(Battery Charger Disabled)
4.50
BAT = 4V
4.25
4.00
BAT = 3.4V
3.75
3.50
VBUS = 5V
5x MODE
3.25
0 200 400 600
OUTPUT CURRENT (mA)
800
40981 G04
USB Compliant Load Current
Available Before Discharging Battery
160
150
140
130
120
110 VBUS = 5V
RCLPROG = 3.01k
1x USB SETTING
100
2.7 3.0 3.3 3.6 3.9
BATTERY VOLTAGE (V)
4.2
40981 G07
Ideal Diode Resistance
vs Battery Voltage
0.25
0.20
INTERNAL IDEAL
DIODE
0.15
0.10
INTERNAL IDEAL DIODE
WITH SUPPLEMENTAL
0.05 EXTERNAL VISHAY
Si2333 PMOS
0
2.7 3.0 3.3 3.6 3.9 4.2
BATTERY VOLTAGE (V)
40981 G02
VOUT Voltage vs VOUT Current
(Battery Charger Enabled)
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
40981 G05
USB Limited Battery Charge
Current vs Battery Voltage
700
600
500
VBUS = 5V
RPROG = 1k
RCLPROG = 3.01k
400
300
LTC4098
200
LTC4098-1
100
5x USB SETTING,
0 BATTERY CHARGER SET FOR 1A
2.7 3.0 3.3 3.6 3.9 4.2
BATTERY VOLTAGE (V)
40981 G08
USB Compliant Load Current
Available Before Discharging Battery
800
750
700
650
600
550 VBUS = 5V
RCLPROG = 3.01k
5x USB SETTING
500
2.7 3.0 3.3 3.6 3.9
BATTERY VOLTAGE (V)
4.2
40981 G03
Battery Charge Current vs VOUT
Current (Battery Charger Enabled)
700
450
200
–50
VBUS = 5V
BAT = 3V
RCLPROG = 3.01k
RPROG = 2k
5x USB SETTING
–300
0
200
400
600
OUTPUT CURRENT (mA)
800
40981 G06
USB Limited Battery Charge
Current vs Battery Voltage
150
125
100
VBUS = 5V
RPROG = 1k
RCLPROG = 3.01k
75
LTC4098
50
LTC4098-1
25
1x USB SETTING,
BATTERY CHARGER SET FOR 1A
0
2.7 3.0 3.3 3.6 3.9
4.2
BATTERY VOLTAGE (V)
40981 G09
40981fc
5
5 Page 
BLOCK DIAGRAM
LTC4098/LTC4098-1
40981fc
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC4098.PDF ] | |
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