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LTC4088 Datasheet, PDF (1/24 Pages) Linear Technology – High Effi ciency Battery Charger/USB Power Manager | |||
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LTC4088
High Efï¬ciency Battery
Charger/USB Power Manager
FEATURES
â Switching Regulator Makes Optimal Use of Limited
Power Available from USB Port to Charge Battery
and Power Application
â 180mΩ Internal Ideal Diode Plus Optional External
Ideal Diode Controller Seamlessly Provides Low
Loss Power Path When Input Power is Limited or
Unavailable
â Full Featured Li-Ion/Polymer Battery Charger
â VBUS Operating Range: 4.25V to 5.5V (7V Absolute
MaximumâTransient)
â 1.2A Maximum Input Current Limit
â 1.5A Maximum Charge Current with Thermal Limiting
â Bat-TrackTM Adaptive Output Control
â Slew Control Reduces Switching EMI
â Low Proï¬le (0.75mm) 14-Lead 4mm à 3mm DFN
Package
U
APPLICATIO S
â Media Players
â Digital Cameras
â GPS
â PDAs
â Smart Phones
DESCRIPTIO
The LTC®4088 is a high efï¬ciency USB PowerPathTM
controller and Li-Ion/Polymer battery charger. It includes
a synchronous switching input regulator, a full-featured
battery charger and an ideal diode. Designed speciï¬cally for
USB applications, the LTC4088âs switching regulator auto-
matically limits its input current to either 100mA, 500mA
or 1A for wall-powered applications via logic control.
The switching input stage provides power to VOUT where
power sharing between the application circuit and the
battery charger is managed. Unlike linear PowerPath
controllers, the LTC4088âs switching input stage can use
nearly all of the 0.5W or 2.5W available from the USB port
with minimal power dissipation. This feature allows the
LTC4088 to provide more power to the application and
eases thermal issues in space-constrained applications.
An ideal diode ensures that system power is available
from the battery when the input current limit is reached
or if the USB or wall supply is removed.
The LTC4088 is available in the low proï¬le 14-Lead 4mm
à 3mm à 0.75mm DFN surface mount package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
PowerPath and Bat-Track are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6522118
TYPICAL APPLICATIO
High Efï¬ciency Battery Charger/USB Power Manager
WALL
3.3µH
USB
10µF
3.3V
1µF
0.1µF
VBUS
D0
D1
D2
CHRG
LDO3V3
CLPROG
SW
LTC4088
PROG C/X GND
VOUT
GATE
BAT
NTC
8.2â¦
2.94k
499â¦
+
Li-Ion
SYSTEM
LOAD
10µF
4088 TA01a
Switching Regulator Efï¬ciency to
System Load (POUT/PBUS)
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
IOUT (A)
1
4088 TA01b
4088f
1
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