LTC4155
Dual-Input Power Manager/
3.5A Li-Ion Battery Charger with
I
2
C Control and USB OTG
FEATURES
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DESCRIPTION
The LTC
®
4155 is a 15 watt I
2
C controlled power manager
with PowerPath™ instant-on operation, high efficiency
switching battery charging and USB compatibility. The
LTC4155 seamlessly manages power distribution from
two 5V sources, such as a USB port and a wall adapter,
to a single-cell rechargeable Lithium-Ion/Polymer battery
and a system load.
The LTC4155’s switching battery charger automatically
limits its input current for USB compatibility, or may
draw up to 3A from a high power wall adapter. The high
efficiency step-down switching charger is designed to
provide maximum power to the application and reduced
heat in high power density applications.
I
2
C adjustability of input current, charge current, battery
float voltage, charge termination, and many other param-
eters allows maximum flexibility. I
2
C status reporting of
key system and charge parameters facilitates intelligent
control decisions. USB On-The-Go support provides 5V
power back to the USB port without any additional com-
ponents. A dual-input, priority multiplexing, overvoltage
protection circuit guards the LTC4155 from high voltage
damage on the V
BUS
pin.
The LTC4155 is available in the low profile (0.75mm)
28-lead 4mm
×
5mm QFN surface mount package.
High Efficiency Charger Capable of 3.5A
Charge Current
Monolithic Switching Regulator Makes Optimal
Use of Limited Power and Thermal Budget
Dual-Input Overvoltage Protection Controller
Priority Multiplexing for Multiple Inputs
I
2
C/SMBus Control and Status Feedback
NTC Thermistor ADC for Temperature Dependent
Charge Algorithms (JEITA)
Instant-On Operation with Low Battery
Battery Ideal Diode Controller for Power
Management
USB On-The-Go Power Delivery to the USB Port
Full Featured Li-Ion/Polymer Battery Charger with
Four Float Voltage Settings
28-Lead 4mm
×
5mm QFN Package
APPLICATIONS
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Tablet PCs
Ultra Mobile PCs
Video Media Players
Digital Cameras, GPS, PDAs
Smart Phones
Portable Medical Devices
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath and Bat-Track are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
TYPICAL APPLICATION
I
2
C Controlled High Power Battery Charger/USB Power Manager
1μH
WALLSNS
WALLGT
V
IN
10μF
3.6k
3
USBGT
USBSNS
ID
I
2
C
IRQ
GND CLPROG2 CLPROG1 PROG V
C
1.21k
499Ω
V
BUS
LTC4155
SW
V
OUT
CHGSNS
BATGATE
BATSNS
NTCBIAS
NTC
OVGCAP
47nF
4155 TA01a
Switching Regulator Efficiency
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0
0.5
V
BAT
= 3.9V
1.0 1.5 2.0
2.5
LOAD CURRENT (A)
3.0
3.5
4155 TA01b
TO
SYSTEM
LOAD
22μF
100k
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LTC4155
TABLE OF CONTENTS
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
I
2
C ........................................................................................................................................................................ 17
Applications Information .......................................................................................................40
Typical Applications .............................................................................................................47
Package Description ............................................................................................................51
Typical Application ..............................................................................................................52
Related Parts .....................................................................................................................52
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LTC4155
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
PIN CONFIGURATION
TOP VIEW
V
BUS
V
BUS
V
OUTSNS
V
BUS
22 V
OUT
21 V
OUT
20 CHGSNS
29
GND
19 CHGSNS
18 PROG
17 BATGATE
16 BATSNS
15 NTC
9 10 11 12 13 14
USBGT
OVGCAP
NTCBIAS
WALLGT
V
C
SCL
SW
SW
V
BUS
(Transient) t < 1ms, Duty Cycle < 1% ... –0.3V to 7V
V
BUS
(Steady State), BATSNS,
IRQ,
NTC...... –0.3V to 6V
DVCC, SDA, SCL (Note 3) ........................–0.3V to V
MAX
I
WALLSNS
, I
USBSNS
............................................... ±20mA
I
NTCBIAS
, I
IRQ
..........................................................10mA
I
SW
, I
VOUT
, I
CHGSNS
(Both Pins in Each Case)..............4A
Operating Junction Temperature Range ... –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
28 27 26 25 24 23
SDA 1
DVCC 2
IRQ
3
ID 4
CLPROG1 5
CLPROG2 6
WALLSNS 7
USBSNS 8
UFD PACKAGE
28-LEAD (4mm 5mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC4155EUFD#PBF
LTC4155IUFD#PBF
TAPE AND REEL
LTC4155EUFD#TRPBF
LTC4155IUFD#TRPBF
PART MARKING*
4155
4155
PACKAGE DESCRIPTION
28-Lead (4mm × 5mm × 0.75mm) Plastic QFN
28-Lead (4mm × 5mm × 0.75mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping
container.Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
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LTC4155
ELECTRICAL CHARACTERISTICS
SYMBOL
V
BUS
V
BUSREG
I
VBUSQ
PARAMETER
Input Supply Voltage
Undervoltage Current Reduction
Input Quiescent Current
Input Undervoltage Current Limit Enabled
USB Suspend Mode
100mA I
VBUS
Mode, I
VOUT
= 0μA, Charger Off
500mA – 3A I
VBUS
Modes, I
VOUT
= 0μA, Charger Off
V
BUS
> V
UVLO
, Battery Charger Off, I
VOUT
= 0μA
V
BUS
= 0V, I
VOUT
= 0μA
Storage and Shipment Mode, DVCC = 0V
100mA I
VBUS
Mode (USB Lo Power) (Default)
500mA I
VBUS
Mode (USB Hi Power)
600mA I
VBUS
Mode
700mA I
VBUS
Mode
800mA I
VBUS
Mode
900mA I
VBUS
Mode (USB 3.0)
1.00A I
VBUS
Mode
1.25A I
VBUS
Mode
1.50A I
VBUS
Mode
1.75A I
VBUS
Mode
2.00A I
VBUS
Mode
2.25A I
VBUS
Mode
2.50A I
VBUS
Mode
2.75A I
VBUS
Mode
3.00A I
VBUS
Mode (Default)
2.5mA I
VBUS
Mode (USB Suspend)
4.05V Setting (Default)
4.10V Setting
4.15V Setting
4.20V Setting
12.50% Charge Current Mode
18.75% Charge Current Mode
25.00% Charge Current Mode
31.25% Charge Current Mode
37.50% Charge Current Mode
43.75% Charge Current Mode
50.00% Charge Current Mode
56.25% Charge Current Mode
62.50% Charge Current Mode
68.75% Charge Current Mode
75.00% Charge Current Mode
81.25% Charge Current Mode
87.50% Charge Current Mode
93.75% Charge Current Mode
100.0% Charge Current Mode (Default)
100.0% Charge Current Mode, R
PROG
= 340Ω
Suspend Mode, I
VOUT
= 1mA
Battery Charger Enabled, Charging, BATSNS ≥ 3.5V
Battery Charger Terminated or Battery Charger
Disabled
Battery Charger Enabled, Charging, BATSNS ≤ 3.3V
3.40
l
l
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
≈
T
J
= 25°C (Note 2). V
BUS
= 5V, BATSNS = 3.7V, DVCC = 3.3V,
R
CLPROG1
= R
CLPROG2
= 1.21k, R
PROG
= 499Ω, unless otherwise noted.
CONDITIONS
l
MIN
4.35
TYP
MAX
5.5
UNITS
V
V
mA
mA
mA
Switching Battery Charger
4.30
0.060
0.560
17
7.0
2.0
0.6
65
460
550
650
745
800
950
1150
1425
1650
1900
2050
2350
2550
2800
4.02
4.07
4.12
4.17
290
430
590
730
880
1025
1180
1330
1485
1635
1780
1915
2065
2210
2350
3.44
80
480
570
670
770
850
1000
1230
1500
1750
2000
2175
2475
2725
2950
1.8
4.05
4.10
4.15
4.20
315
465
620
770
925
1075
1230
1385
1535
1685
1835
1980
2130
2280
2430
3.57
4.35
BATSNS
4.35
3.50
3.0
1.25
100
500
600
700
800
900
1025
1300
1575
1875
2125
2300
2600
2900
3100
2.5
4.08
4.13
4.18
4.23
340
500
650
810
970
1125
1280
1440
1585
1735
1890
2045
2195
2350
2500
3.70
4.5
4.5
I
BATQ
Battery Drain Current
μA
μA
μA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
V
V
V
V
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
A
V
V
V
V
I
VBUSLIM
Total Input Current When Load
Exceeds Power Limit
l
V
FLOAT
BATSNS Regulated Output Voltage
Selected by I
2
C Control.
Switching Modes
Regulated Battery Charge Current
Selected by I
2
C Control
l
l
l
l
I
CHARGE
I
CHARGE(MAX)
V
OUT
Regulated Battery Charge Current
PowerPath Regulated Output
Voltage (V
BUS
Power Available)
V
OUT(MIN)
Low Battery Instant-On Output
Voltage (V
BUS
Power Available)
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LTC4155
ELECTRICAL CHARACTERISTICS
SYMBOL
I
VOUT
PARAMETER
V
OUT
Current Available Before
Loading Battery
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
≈
T
J
= 25°C (Note 2). V
BUS
= 5V, BATSNS = 3.7V, DVCC = 3.3V,
R
CLPROG1
= R
CLPROG2
= 1.21k, R
PROG
= 499Ω, unless otherwise noted.
CONDITIONS
2.5mA I
VBUS
Mode (USB Suspend)
100mA I
VBUS
Mode, BAT = 3.3V
500mA I
VBUS
Mode, BAT = 3.3V
600mA I
VBUS
Mode, BAT = 3.3V
700mA I
VBUS
Mode, BAT = 3.3V
800mA I
VBUS
Mode, BAT = 3.3V
900mA I
VBUS
Mode, BAT = 3.3V
1.00A I
VBUS
Mode, BAT = 3.3V
1.25A I
VBUS
Mode, BAT = 3.3V
1.50A I
VBUS
Mode, BAT = 3.3V
1.75A I
VBUS
Mode, BAT = 3.3V
2.00A I
VBUS
Mode, BAT = 3.3V
2.25A I
VBUS
Mode, BAT = 3.3V
2.50A I
VBUS
Mode, BAT = 3.3V
2.75A I
VBUS
Mode, BAT = 3.3V
3.00A I
VBUS
Mode, BAT = 3.3V
12.50% Charge Current Mode
18.75% Charge Current Mode
25.00% Charge Current Mode
31.25% Charge Current Mode
37.50% Charge Current Mode
43.75% Charge Current Mode
50.00% Charge Current Mode
56.25% Charge Current Mode
62.50% Charge Current Mode
68.75% Charge Current Mode
75.00% Charge Current Mode
81.25% Charge Current Mode
87.50% Charge Current Mode
93.75% Charge Current Mode
100.0% Charge Current Mode (Default)
Threshold Voltage Relative to V
FLOAT
1-Hour Mode
2-Hour Mode
4-Hour Mode (Default)
8-Hour Mode
Rising Threshold
Hysteresis
BATSNS < (V
LOWBAT
– ΔV
LOWBAT
)
C/10 Mode (I
CHARGE
= 10%FS) (Default)
C/5 Mode (I
CHARGE
= 20%FS)
C/20 Mode (I
CHARGE
= 5%FS)
C/50 Mode (I
CHARGE
= 2%FS)
96.6
0.95
1.90
3.81
7.63
2.65
0.47
110
230
15
50
MIN
1
TYP
1.3
76
673
810
944
1093
1200
1397
1728
2072
2411
2700
2846
3154
3408
3657
150
225
300
375
450
525
600
675
750
825
900
975
1050
1125
1200
97.6
1.06
2.12
4.24
8.48
2.8
130
0.53
120
240
24
60
1000
CLPROG1 I
VBUS
Mode
990
98.4
1.17
2.33
4.66
9.32
2.95
0.59
130
250
33
70
MAX
UNITS
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
%
Hours
Hours
Hours
Hours
V
mV
Hours
mV
mV
mV
mV
mA/mA
mA/mA
V
PROG
PROG Pin Servo Voltage
V
RECHRG
t
TERMINATE
Recharge Battery Threshold
Voltage
Safety Timer Termination Period
Selected by I
2
C Control. Timer
Starts When BATSNS ≥ V
FLOAT
Threshold Voltage
Bad Battery Termination Time
Full Capacity Charge Indication
PROG Voltage Selected by I
2
C
Control
Ratio of I
CHGSNS
to PROG Pin
Current
Ratio of Measured V
BUS
Current to
CLPROG1 Sense Current
V
LOWBAT
t
BADBAT
V
C/x
h
PROG
h
CLPROG1
(Note 4)
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