LTC4155
Dual-Input Power Manager/
3.5A Li-Ion Battery Charger with
2
I C Control and USB OTG
Fea T Descrip T
2
n
High Efficiency Charger Capable of 3.5A
The LTC 4155 is a 15 watt I C controlled power manager
Charge Current
with PowerPath instant-on operation, high efficiency
n
Monolithic Switching Regulator Makes Optimal
switching battery charging and USB compatibility. The
Use of Limited Power and Thermal Budget
LTC4155 seamlessly manages power distribution from
n
Dual-Input Overvoltage Protection Controller
two 5V sources, such as a USB port and a wall adapter,
n
Priority Multiplexing for Multiple Inputs
to a single-cell rechargeable Lithium-Ion/Polymer battery
2
n
I C/SMBus Control and Status Feedback
and a system load.
n
NTC Thermistor ADC for Temperature Dependent
The LTC4155s switching battery charger automatically
Charge Algorithms (JEITA)
limits its input current for USB compatibility, or may
n
Instant-On Operation with Low Battery
draw up to 3A from a high power wall adapter. The high
n
Battery Ideal Diode Controller for Power
efficiency step-down switching charger is designed to
Management
provide maximum power to the application and reduced
n
USB On-The-Go Power Delivery to the USB Port
heat in high power density applications.
n
Full Featured Li-Ion/Polymer Battery Charger with
2
I C adjustability of input current, charge current, battery
Four Float Voltage Settings
n
float voltage, charge termination, and many other param-
28-Lead 4mm 5mm QFN Package
2
eters allows maximum flexibility. I C status reporting of
a T
key system and charge parameters facilitates intelligent
control decisions. USB On-The-Go support provides 5V
n
Tablet PCs
power back to the USB port without any additional com-
n
Ultra Mobile PCs
ponents. A dual-input, priority multiplexing, overvoltage
n
Video Media Players
protection circuit guards the LTC4155 from high voltage
n
Digital Cameras, GPS, PDAs
damage on the V pin.
n BUS
Smart Phones
n
Portable Medical Devices
The LTC4155 is available in the low profile (0.75mm)
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
28-lead 4mm 5mm QFN surface mount package.
PowerPath and Bat-Track are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
Typical a T
Switching Regulator Efficiency
2
I C Controlled High Power Battery Charger/USB Power Manager 100
90
1H
TO
WALLSNS SW SYSTEM 80
WALLGT LOAD
V
OUT 70
60
CHGSNS
V V
IN BUS
50
10F
BATGATE 22F
LTC4155
40
USBGT BATSNS
3.6k 100k
30
USBSNS NTCBIAS
ID NTC
20
3
2
I C IRQ GND CLPROG2 CLPROG1 PROG V OVGCAP
C
10
V = 3.9V
BAT
0
499
1.21k
47nF 0 1.0 1.5 2.0 2.5 3.0 3.5
0.5
LOAD CURRENT (A) 4155 TA01b
4155 TA01a
4155fd
For more information www.linear.com/LTC4155 1
EFFICIENCY (%)
ion pplica
ions pplica
ion uresLTC4155
Table o F c T Ts
Features ............................................................................................................................ 1
Applications ....................................................................................................................... 1
Typical Application ............................................................................................................... 1
Description......................................................................................................................... 1
Absolute Maximum Ratings ..................................................................................................... 3
Order Information ................................................................................................................. 3
Pin Configuration ................................................................................................................. 3
Electrical Characteristics ........................................................................................................ 4
Typical Performance Characteristics .......................................................................................... 9
Pin Functions .....................................................................................................................12
Block Diagram ....................................................................................................................15
Timing Diagrams ................................................................................................................16
Operation..........................................................................................................................17
2
I C ........................................................................................................................................................................ 17
Applications Information .......................................................................................................40
Typical Applications .............................................................................................................47
Package Description ............................................................................................................51
Typical Application ..............................................................................................................52
Related Parts .....................................................................................................................52
4155fd
2 For more information www.linear.com/LTC4155
en on