LTC4088
High Efficiency Battery
Charger/USB Power Manager
Fea T Descrip T
n
Switching Regulator Makes Optimal Use of Limited The LTC 4088 is a high efficiency USB PowerPath
Power Available from USB Port to Charge Battery controller and Li-Ion/Polymer battery charger. It includes
and Power Application a synchronous switching input regulator, a full-featured
n
180m Internal Ideal Diode Plus Optional External battery charger and an ideal diode. Designed specifically
Ideal Diode Controller Seamlessly Provides Low for USB applications, the LTC4088s switching regulator
Loss Power Path When Input Power is Limited or automatically limits its input current to either 100mA,
Unavailable 500mA or 1A for wall-powered applications via logic
n
Full Featured Li-Ion/Polymer Battery Charger control.
n
V Operating Range: 4.25V to 5.5V (7V Absolute
BUS
The switching input stage provides power to V where
OUT
MaximumTransient)
power sharing between the application circuit and the
n
1.2A Maximum Input Current Limit
battery charger is managed. Unlike linear PowerPath
n
1.5A Maximum Charge Current with Thermal Limiting
controllers, the LTC4088s switching input stage can use
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Bat-Track Adaptive Output Control
nearly all of the 0.5W or 2.5W available from the USB port
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Slew Control Reduces Switching EMI
with minimal power dissipation. This feature allows the
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Low Profile (0.75mm) 14-Lead 4mm 3mm DFN
LTC4088 to provide more power to the application and
Package
eases thermal issues in space-constrained applications.
An ideal diode ensures that system power is available
a T
from the battery when the input current limit is reached
n or if the USB or wall supply is removed.
Media Players
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Digital Cameras
The LTC4088 is available in the low profile 14-lead 4mm
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GPS
3mm 0.75mm DFN surface mount package.
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PDAs
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
n PowerPath, Bat-Track and ThinSOT are trademarks of Linear Technology Corporation. All other
Smart Phones
trademarks are the property of their respective owners. Protected by U.S. Patents, including
6522118.
Typical a T
Switching Regulator Efficiency to
System Load (P /P )
High Efficiency Battery Charger/USB Power Manager OUT BUS
100
WALL
3.3H 90
80
SYSTEM
USB V SW V BAT = 4.2V
BUS OUT 70
LOAD
D0
10F
60
D1 GATE
BAT = 3.3V
50
D2 LTC4088 BAT
CHRG
40
10F
3.3V LDO3V3
30
CLPROG PROG C/X GND NTC
20
V = 5V
BUS
1F
+
I = 0mA
10
BAT
8.2
Li-Ion
10x MODE
2.94k 499
0.1F
0
4088 TA01a
0.01 0.1 1
I (A)
OUT
4088 TA01b
4088fb
1
EFFICIENCY (%)
ion pplica
ions pplica
ion uresLTC4088
a Te Maxi Mu M r a T p c F T
(Note 1)
TOP VIEW
V (Transient) t < 1ms, Duty Cycle < 1% .. 0.3V to 7V
BUS
NTC 1 14 D1
V (Static), BAT, CHRG, NTC, D0,
BUS
CLPROG 2 13 D0
D1, D2 .......................................................... 0.3V to 6V
LDO3V3 3 12 SW
I ....................................................................3mA
CLPROG
15
D2 4 11 V
BUS
I , I ................................................................2mA
C/X 5 10 V
PROG C/X OUT
PROG 6 9 BAT
I ...................................................................30mA
LDO3V3
CHRG 7 8 GATE
I ......................................................................75mA
CHRG
I ............................................................................2A
DE PACKAGE
OUT
14-LEAD (4mm 3mm) PLASTIC DFN
I ..............................................................................2A
SW
T = 125C, = 37C/W
JMAX JA
IBAT ............................................................................2A EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB
Maximum Operating Junction Temperature .......... 125C
Operating Temperature Range .................40C to 85C
Storage Temperature Range .................. 65C to 125C
o r D i n F Ma T
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4088EDE#PBF LTC4088EDE#TRPBF 4088 14-Lead (4mm 3mm) Plastic DFN 40C to 85C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: