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LTC4055EUF#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LTC4055/LTC4055-1
1
4055fb
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
USB Power Controller
and Li-Ion Charger
n
Portable USB Devices: Cameras, MP3 Players, PDAs
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. *Protected by U.S. Patent, including 6522118.
Input and Battery Current vs Load Current
R
PROG
= R
CLPROG
= 97.6k
n
Charges Single-Cell Li-Ion Batteries Directly from
USB Port
n
Load Dependent Charging Guarantees USB Input
Current Compliance
n
Automatic Battery Switchover When Input Supply is
Removed
n
Constant-Current/Constant-Voltage Operation with
Thermal Feedback to Maximize Charging Rate
Without Risk of Overheating*
n
Selectable 500mA/100mA Current Limit
n
Low Loss Full PowerPath
™
Control with Ideal Diode
Operation (Reverse Current Blocking)
n
Preset 4.2V Charge Voltage with 0.8% Accuracy
(4.1V for LTC4055-1)
n
4.1V Float Voltage (LTC4055-1) Improves Battery Life
and High Temperature Safety Margin
n
USB-Compliant Suspend Mode
n
Programmable Charge Current and Termination Timer
n
Soft-Start Limits Inrush Current
n
NTC Thermistor Input for Temperature Qualifi ed
Charging
n
Tiny (4mm × 4mm × 0.75mm) QFN Package
The LTC
®
4055/LTC4055-1 are USB power manager and
Li-Ion battery chargers designed to work in portable
battery-powered applications. The parts manage and limit
the total current used by the USB peripheral for operation
and battery charging. Depending on the state of the current
select pin (HPWR), total input current can be limited to
either 100mA or 500mA. The voltage drop from the USB
supply or battery to the USB peripheral is typically less than
100mV at 400mA and 20mV at 80mA. Other management
features include: automatic switchover to battery when
input is removed, inrush current limiting, reverse current
blocking, undervoltage lockout and thermal shutdown.
The LTC4055/LTC4055-1 include a complete constant-
current/constant-voltage linear charger for single-cell
Li-ion batteries. The fl oat voltage applied to the battery
is held to a tight 0.8% tolerance, and charge current is
programmable using an external resistor to ground. Fully
discharged cells are automatically trickle charged at 10%
of the programmed current until the cell voltage exceeds
2.8V. Total charge time is programmable by an external
capacitor to ground. When the battery drops 100mV below
the fl oat voltage, automatic recharging of the battery
occurs. Also featured is an NTC thermistor input used to
monitor battery temperature while charging.
The LTC4055/LTC4055-1 are available in a 16-pin low
profi le (4mm × 4mm) QFN package.
I
LOAD
(mA)
0
CURRENT (mA)
300
400
600
500
I
IN
400
4055 TA02
200
100
–100
0
100
200
300
600500
I
BAT
CHARGING
I
LOAD
I
BAT
(IDEAL DIODE)
+
IN1
IN2
V
NTC
NTC
WALL
SHDN
SUSP
HPWR
OUT
Li-Ion
CELL
10μF
1Ω
10μF
TIMER PROG
LTC4055
CLPROG GND
4055 TA01
TO SYSTEM
LOADS
BAT
CHRG
ACPR
0.1μF 97.6k 97.6k
SUSPEND USB POWER
500mA/100mA SELECT
5V (NOM)
FROM USB
CABLE V
BUS
LTC4055/LTC4055-1
2
4055fb
PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
Terminal Voltage
IN1, IN2, OUT, BAT .................................. –0.3V to 6V
NTC, V
NTC
, TIMER,
PROG, CLPROG ..................... –0.3V to (VCC + 0.3V)
CHRG, HPWR, SUSP, SHDN,
WALL, ACPR ........................................... –0.3V to 6V
IN2 ........................................................... V
IN1
+ 0.1V
Pin Current (DC)
IN1, IN2, OUT, BAT (Note 7) ............................... 1.6A
Operating Temperature Range................. –40°C to 85°C
Maximum Operating Junction Temperature ......... 125°C
Storage Temperature Range .................. –65°C to 125°C
(Notes 1, 2, 3, 4, 5)
16 15 14 13
5 6 7 8
TOP VIEW
17
UF PACKAGE
16-LEAD (4mm s 4mm) PLASTIC QFN
9
10
11
12
4
3
2
1IN2
BAT
OUT
IN1
TIMER
PROG
GND
CLPROG
NTC
VNTC
CHRG
ACPR
WALL
SHDN
SUSP
HPWR
T
JMAX
= 125°C, θ
JA
= 37°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4055EUF#PBF LTC4055EUF#TRPBF 4055
16-Lead (4mm × 4mm) Plastic QFN
–40°C to 85°C
LTC4055EUF-1#PBF LTC4055EUF-1#TRPBF 40551
16-Lead (4mm × 4mm) Plastic QFN
–40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN1
= V
IN2
= 5V, V
BAT
= 3.5V, HPWR = 5V, WALL = 0V,
R
PROG
= R
CLPROG
= 100k, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Input Supply Voltage IN1, IN2 and OUT
l
4.35 5.5 V
V
BAT
Input Voltage BAT
l
4.3 V
I
IN
Input Supply Current V
BAT
= 4.2V
Suspend Mode
Suspend Mode, Wall = 2V, V
OUT
= 4.8V
Shutdown
l
l
l
l
0.8
50
0.1
10
1.6
100
0.2
20
mA
μA
mA
μA
I
OUT
Output Supply Current V
OUT
= 5V, V
IN1
= V
IN2
= 0V, V
BAT
= 4.2V
l
450 900 μA
I
BAT
Battery Drain Current V
BAT
= 4.2V, Charging Stopped
Suspend Mode
Shutdown
V
IN1
= V
IN2
= 0V, BAT Powers OUT, No Load
l
l
l
l
15
15
2.5
50
30
30
5
100
μA
μA
μA
μA
I
LIM(MAX)
Maximum Current Limit (Note 8) 1 A
V
UVLO
Input or Output Undervoltage Lockout V
IN
Powers Part, Rising Threshold
V
OUT
Powers Part, Rising Threshold
l
l
3.5
3.5
3.8
3.8
4
4
V
V
ΔV
UVLO
Input or Output Undervoltage Lockout
Hysteresis
V
IN
Rising – V
IN
Falling or
V
OUT
Rising – V
OUT
Falling
125 mV
LTC4055/LTC4055-1
3
4055fb
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN1
= V
IN2
= 5V, V
BAT
= 3.5V, HPWR = 5V, WALL = 0V,
R
PROG
= R
CLPROG
= 100k, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Current Limit
I
LIM
Current Limit R
CLPROG
= 100k, HPWR = 5V
R
CLPROG
= 100k, HPWR = 0V
l
l
465
89
490
97
515
105
mA
mA
R
ON
ON Resistance V
IN
to V
OUT
HPWR = 5V, 400mA Load
HPWR = 0V, 80mA Load
0.2
0.2
Ω
Ω
V
PROG
Programming Pin Voltage
(PROG, CLPROG)
R
CLPROG
= R
PROG
= 100k
R
CLPROG
= R
PROG
= 50k
l
l
0.98
0.98
1.000
1.000
1.02
1.02
V
V
I
SS
Soft-Start Inrush Current IN or OUT 5 mA/μs
V
CLEN
Input Current Limit Enable Threshold V
IN
Rising
l
3.5 3.8 4 V
ΔV
CLEN
Input Current Limit Enable Threshold V
IN
Rising – V
IN
Falling 125 mV
V
ALEN
Automatic Limit Enable Threshold
Voltage
(V
IN
– V
OUT
) V
IN
Rising
(V
IN
– V
OUT
) V
IN
Falling
25
–75
50
–50
75
–25
mV
mV
Battery Charger
V
FLOAT
Regulated BAT Voltage (0°C to 85°C) I
BAT
= 2mA (LTC4055)
I
BAT
= 2mA (LTC4055)
l
4.165
4.158
4.200
4.200
4.235
4.242
V
V
(0°C to 85°C). I
BAT
= 2mA (LTC4055-1)
I
BAT
= 2mA (LTC4055-1)
l
4.066
4.059
4.100
4.100
4.134
4.141
V
V
I
BAT
Current Mode Charge Current R
PROG
= 100k, HPWR = 5V, No Load
R
PROG
= 100k, HPWR = 0V, No Load
R
PROG
= 100k, V
OUT
= 5V, V
IN
= 0V,
V
WALL
= 2V
R
PROG
= 50k, HPWR = 5V, No Load
R
PROG
= 50k, V
OUT
= 5V, V
IN
= 0V,
V
WALL
= 2V
l
l
l
l
l
445
45
445
900
900
485
80
485
980
980
525
110
525
1060
1060
mA
mA
mA
mA
mA
I
BAT(MAX)
Maximum Charge Current (Note 8) 1 A
ΔI
B
/ΔI
O
Charge Current Load Dependency ΔI
BAT
/ΔI
OUT
, I
OUT
= 100mA
l
0.95 1 1.05 mA/mA
I
TRKL
Trickle-Charge Current V
BAT
= 2V, R
PROG
= 100k 30 45 60 mA
V
TRKL
Trickle-Charge Threshold Voltage V
BAT
Rising
l
2.7 2.85 3 V
V
CENI
Input Charger Enable Threshold
Voltage
(V
IN
– V
BAT
) High to Low
(V
IN
– V
BAT
) Low to High
70
80
mV
mV
V
CENO
Output Charger Enable Threshold
Voltage
(V
OUT
– V
BAT
) High to Low
(V
OUT
– V
BAT
) Low to High
70
80
mV
mV
V
UVCL
Input/Output Undervoltage Current Limit I
BAT
= I
CHG
/2
l
4.23 4.3 4.37 V
V
RECHRG
Recharge Battery Threshold Voltage V
FLOAT
– V
RECHRG
l
65 100 135 mV
t
TIMER
TIMER Accuracy C
TIMER
= 0.1μF ±10 %
Recharge Time Percent of Total Charge Time 50 %
Low Battery Trickle-Charge Time Percent of Total Charge Time, V
BAT
< 2.8V 25 %
T
LIM
Junction Temperature in Constant
Temperature Mode
105 °C
Ideal Diode
R
FWD
On Resistance, V
ON
Regulation V
BAT
= 3.5V, 100mA Load 0.1 Ω
R
DIO,ON
On Resistance V
BAT
to V
OUT
V
BAT
= 3.5V, 600mA Load 0.2 Ω
V
FWD
Voltage Forward Drop (V
BAT
– V
OUT
)V
BAT
= 3.5V, 5mA Load
V
BAT
= 3.5V, 100mA Load
V
BAT
= 3.5V, 600mA
l
10 30
55
120
50 mV
mV
mV
V
OFF
Diode Disable Battery Voltage V
BAT
Falling 2.8 V
I
FWD
Load Current Limit for V
ON
Regulation V
IN
= 3.5V 550 mA
I
MAX
Diode Current Limit V
BAT
= 3.5V, V
OUT
= 2.8V, Pulsed with
10% Duty Cycle
1.4 1.8 2.2 A
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LTC4055EUF#PBF

Mfr. #:
Buy LTC4055EUF#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management USB Pwr Cntr & Li-Ion Lin Chr
Lifecycle:
New from this manufacturer.
Delivery:
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