FEATURES
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LTC4066/LTC4066-1
USB Power Controller and
Li-Ion Linear Charger with
Low Loss Ideal Diode
DESCRIPTION
The LTC
®
4066/LTC4066-1 are USB power managers and
Li-Ion battery chargers designed to work in portable
battery-powered applications. The parts control the total
current used by the USB peripheral for operation and
battery charging. The total input current can be limited
to 100mA, 500mA or “unlimited” (i.e., above 2A). Battery
charge current is automatically reduced such that the sum
of the load current and the charge current does not exceed
the programmed input current limit.
The LTC4066/LTC4066-1 include a standalone constant-
current/constant-voltage linear charger for single cell
Li-ion batteries. The float voltage applied to the battery
is held to a tight 0.8% tolerance, and charge current
is programmable using an external resistor to ground.
A programmable end-of-charge status output (CHRG)
indicates full charge. BAT pin charge and discharge cur-
rents can be monitored via an analog output (I
STAT
). Total
charge time is programmable by an external capacitor to
ground. When the battery drops 100mV below the float
voltage, automatic recharging of the battery occurs. Also
featured is an NTC thermistor input used to monitor bat-
tery temperature while charging.
The LTC4066/LTC4066-1 are available in a 24-pin thin
profile (0.75mm) 4mm
×
4mm QFN package. The LTC4066
is also available in a 24-pin ultrathin profile (0.55mm)
4mm
×
4mm UTQFN package.
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. Patents including 6522118.
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Seamless Transition Between Input Power Sources:
Li-Ion Battery, USB and 5V Wall Adapter
Low Loss (50mΩ) Ideal Diode Path from BAT to OUT
Programmable Charge Current Detection (CHRG)
Load Dependent Charging Guarantees USB Input
Current Compliance
Analog Gas Gauge Function
Charges Single Cell Li-Ion Batteries Directly from
USB Port
Constant-Current/Constant-Voltage Operation with
Thermal Feedback to Maximize Charging Rate
Without Risk of Overheating*
Selectable 100% or 20% Current Limit
(e.g., 500mA/100mA)
Termination Timer Adapts to Actual Charge Current
Preset 4.2V Charge Voltage with 0.8% Accuracy
(4.1V for LTC4066-1)
NTC Thermistor Input for Temperature Qualified
Charging
Thin Profile (0.75mm) 24-Lead 4mm
×
4mm
QFN Package
Ultrathin Profile (0.55mm) 24-Lead 4mm
×
4mm
UTQFN Package (LTC4066 Only)
APPLICATIONS
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Portable USB Devices
GPS, Cameras, Broadband Wireless Modems
Mulitple Input Chargers
TYPICAL APPLICATION
5V (NOM)
FROM USB
CABLE V
BUS
IN
4.7μF
V
NTC
NTC
WALL
SHDN
SUSPEND USB POWER
500mA/100mA SELECT
INPUT CURRENT
LIMIT DISABLE
0.1μF
SUSP
HPWR
CLDIS
TIMER PROG
CLPROG
2k
OUT
BAT
CURRENT (mA)
600
500
400
I
LOAD
300
200
100
TO ADC FOR
GAS GAUGE
0
–100
I
IN
+
510Ω
510Ω
TO LDOs,
REGs, ETC
4.7μF
LTC4066
CHRG
ACPR
POL
I
STAT
GND
2k
4066 TA01
I
BAT
CHARGING
100k
0
100
200
300
400
I
LOAD
(mA)
500
600
I
BAT
(IDEAL DIODE)
4066 TA02
4066fc
1
LTC4066/LTC4066-1
ABSOLUTE MAXIMUM RATINGS
(Notes 1 to 6)
Terminal Voltage
t < 1ms and Duty Cycle < 1%
IN, OUT ................................................... –0.3V to 7V
Steady State
IN, OUT, BAT ........................................... –0.3V to 6V
NTC, V
NTC
, TIMER, PROG,
CLPROG, I
STAT
....................... –0.3V to (V
CC
+ 0.3V)
CHRG,
HPWR, SUSP SHDN,
,
WALL,
ACPR,
POL, CLDIS ...................... –0.3V to 6V
Pin Current (DC)
IN (Note 7) .......................................................... 2.7A
OUT, BAT (Note 7) .................................................. 5A
Operating Temperature Range................. –40°C to 85°C
Maximum Operating Junction Temperature ......... 125°C
Storage Temperature Range.................. –65°C to 125°C
PIN CONFIGURATION
TOP VIEW
CLPROG
TIMER
PROG
WALL
I
STAT
I
STAT
POL
TOP VIEW
CLPROG
TIMER
PROG
WALL
POL
18
CHRG
17
ACPR
25
16 GND
15 V
NTC
14 NTC
13 HPWR
7
NC
8
OUT
9 10 11 12
CLDIS
IN
SUSP
SHDN
24 23 22 21 20 19
OUT 1
BAT 2
OUT 3
BAT 4
BAT 5
NC 6
7
NC
8
OUT
9 10 11 12
CLDIS
IN
SUSP
SHDN
25
18
CHRG
17
ACPR
16 GND
15 V
NTC
14 NTC
13 HPWR
OUT 1
BAT 2
OUT 3
BAT 4
BAT 5
NC 6
24 23 22 21 20 19
UF PACKAGE
24-LEAD (4mm 4mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 37°C/W
EXPOSED PAD (PIN #) IS GND, MUST BE SOLDERED TO PCB
PF PACKAGE
24-LEAD (4mm 4mm) PLASTIC UTQFN
T
JMAX
= 125°C,
θ
JA
= 37°C/W
EXPOSED PAD (PIN #) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC4066EUF#PBF
LTC4066EUF-1#PBF
LTC4066EPF#PBF
TAPE AND REEL
LTC4066EUF#TRPBF
LTC4066EUF-1#TRPBF
LTC4066EPF#TRPBF
PART MARKING
4066
40661
4066T
PACKAGE DESCRIPTION
24-Lead (4mm
×
4mm) Plastic QFN
24-Lead (4mm
×
4mm) Plastic QFN
24-Lead (4mm
×
4mm) Plastic UTQFN
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
4066fc
2
LTC4066/LTC4066-1
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IN
V
BAT
I
IN
PARAMETER
Input Supply Voltage
Input Voltage
Input Supply Current
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 5V, V
BAT
= 3.7V, HPWR = 5V, WALL = 0V, R
PROG
= 100k,
R
CLPROG
= R
ISTAT
= 2k, unless otherwise noted.
CONDITIONS
IN and OUT
BAT
I
BAT
= I
ISTAT
= 0 (Note 8)
Suspend Mode; SUSP = 2V
Suspend Mode; SUSP = 2V, Wall = 2V, V
OUT
= 4.8V
Shutdown; SHDN = 2V
V
OUT
= 5V, V
IN
= 0V, V
BAT
= 4.3V, TIMER = 0V
V
BAT
= 4.3V, Charging Stopped
Suspend Mode; SUSP = 2V
Shutdown; SHDN = 2V
V
IN
= 0V, BAT Powers OUT, No Load
(Note 9)
V
IN
Powers Part, Rising Threshold
V
OUT
Powers Part, Rising Threshold
V
IN
Rising – V
IN
Falling or
V
OUT
Rising – V
OUT
Falling
R
CLPROG
= 2k, HPWR = 5V
R
CLPROG
= 2k, HPWR = 0V
HPWR = 5V, 400mA Load
HPWR = 0V, 80mA Load
R
CLPROG
= 2k
R
CLPROG
= 1k
IN or OUT
(V
IN
– V
OUT
) V
IN
Rising
(V
IN
– V
OUT
) V
IN
Falling
(0°C to 85°C), I
BAT
= 2mA
I
BAT
= 2mA
(0°C to 85°C), I
BAT
= 2mA (LTC4066-1)
I
BAT
= 2mA (LTC4066-1)
R
PROG
= 100k, No Load
R
PROG
= 50k, No Load
(Note 9)
R
PROG
= 100k
R
PROG
= 50k
I
BAT
= 50mA
I
BAT
= 100mA
I
BAT
= 500mA
I
BAT
= 1000mA
V
BAT
= V
FLOAT
(4.2V, 4.1V for LTC4066-1)
V
BAT
= 2V, R
PROG
= 100k
(V
OUT
– V
BAT
) High to Low, V
BAT
= 4V
(V
OUT
– V
BAT
) Low to High, V
BAT
= 4V
V
FLOAT
– V
RECHRG
V
BAT
= 4.2V (4.1V for LTC4066-1)
Percent of Total Charge Time
Percent of Total Charge Time, V
BAT
< 2.8V
l
l
l
l
l
l
l
l
l
l
l
l
l
MIN
4.35
TYP
I
OUT
BAT
Output Supply Current
Battery Drain Current
I
IN(MAX)
V
UVLO
ΔV
UVLO
Maximum Input Current Limit
Input or Output Undervoltage Lockout
Input or Output Undervoltage Lockout
1.9
3.6
3.6
0.5
50
50
10
400
15
15
2.5
55
2.6
3.8
3.8
125
MAX
5.5
4.3
1.2
100
100
20
800
27
27
5
100
4
4
UNITS
V
V
mA
μA
μA
μA
μA
μA
μA
μA
μA
A
V
V
mV
Current Limit
Current Limit
I
LIM
R
ON
V
CLPROG
I
SS
V
ALEN
ON Resistance V
IN
to V
OUT
CLPROG Pin Voltage
l
l
475
90
l
0.980
0.980
25
–85
4.165
4.158
4.066
4.059
460
920
0.980
0.980
875
900
925
950
94
35
2.8
Soft-Start Inrush Current
Automatic Current Limit Enable Threshold
Voltage
Battery Charger
Regulated Output Voltage
V
FLOAT
500
100
0.16
0.16
1.000
1.000
10
50
–60
4.200
4.200
4.100
4.100
500
1000
1.5
1.000
1.000
1000
1000
1000
1000
100
50
2.9
60
90
100
50
25
525
110
1.020
1.020
75
–25
4.235
4.242
4.134
4.141
540
1080
1.020
1.020
1125
1100
1075
1050
106
60
3
mA
mA
Ω
Ω
V
V
mA/μs
mV
mV
V
V
V
V
mA
mA
A
V
V
mA/mA
mA/mA
mA/mA
mA/mA
mV
mA
V
mV
mV
mV
%
%
%
4066fc
l
l
l
l
l
l
l
l
l
l
l
l
I
BAT
I
BAT(MAX)
V
PROG
k
ISTAT
Current Mode Charge Current
Maximum Charge Current
PROG Pin Voltage
Ratio of I
BAT
(Charging) to I
STAT
Pin Current
V
EOC
I
TRIKL
V
TRIKL
V
CEN
V
RECHRG
t
TIMER
End-of-Charge I
STAT
Pin Voltage
Trickle Charge Current
Trickle Charge Threshold Voltage
Charger Enable Threshold Voltage
Recharge Battery Threshold Voltage
TIMER Accuracy
Recharge Time
Low-Battery Trickle Charge Time
l
60
–10
130
10
3
LTC4066/LTC4066-1
ELECTRICAL CHARACTERISTICS
SYMBOL
T
LIM
PARAMETER
Junction Temperature in Constant
Temperature Mode
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 5V, V
BAT
= 3.7V, HPWR = 5V, WALL = 0V, R
PROG
= 100k,
R
CLPROG
= R
ISTAT
= 2k, unless otherwise noted.
CONDITIONS
MIN
TYP
105
MAX
UNITS
°C
Ideal Diode
Incremental Resistance, V
ON
Regulation
R
FWD
On-Resistance V
BAT
to V
OUT
R
DIO(ON)
Voltage Forward Drop (V
BAT
– V
OUT
)
V
FWD
k
DIO,ISTAT
V
OFF
I
FWD
I
D(MAX)
Logic
V
OL
V
IH
V
IL
I
PULLDN
V
CHG,SD
Ratio of I
BAT
(Discharging Through Ideal
Diode) to I
STAT
Pin Current
Diode Disable Battery Voltage
Load Current Limit for V
ON
Regulation
Diode Current Limit
I
BAT
= 500mA
I
BAT
= 3A
I
BAT
= 5mA
I
BAT
= 200mA
I
BAT
= 2A
I
BAT
= 5mA
I
BAT
= 20mA
V
BAT
= 3.5V
l
10
850
850
3.8
I
SINK
= 5mA
SUSP SHDN, HPWR, CLDIS Pin
,
SUSP SHDN, HPWR, CLDIS Pin
,
SUSP SHDN, HPWR, CLDIS
,
l
l
l
27
45
30
47
95
1000
1000
2.8
2.5
5.2
0.1
50
1150
1150
mΩ
mΩ
mV
mV
mV
mA/mA
mA/mA
V
A
A
V
V
V
μA
V
μA
Output Low Voltage (CHRG,
ACPR,
POL)
Enable Input High Voltage
Enable Input Low Voltage
Logic Input Pull-Down Current
Charger Shutdown Threshold Voltage on
TIMER
Charger Shutdown Pull-Up Current on
I
CHG,SD
TIMER
Wall Input Threshold Voltage
V
WALL
V
WALL,HYS
Wall Input Hysteresis
Wall Input Leakage Current
I
WALL
NTC
V
NTC
Pin Current
I
VNTC
V
NTC
Bias Voltage
V
VNTC
NTC Input Leakage Current
I
NTC
Cold Temperature Fault Threshold Voltage
V
COLD
V
HOT
V
DIS
Hot Temperature Fault Threshold Voltage
NTC Disable Voltage
0.25
0.4
1.2
2
l
0.15
2
1.200
4
1.225
35
0
0.4
V
TIMER
= 0V
V
WALL
Rising Threshold
V
WALL
Rising – V
WALL
Falling Threshold
V
WALL
= 1V
V
VNTC
= 2.5V
I
VNTC
= 500μA
V
NTC
= 1V
Rising Threshold
Hysteresis
Falling Threshold
Hysteresis
NTC Input Voltage to GND (Falling)
Hysteresis
l
l
1.250
±50
V
mV
nA
mA
V
μA
V
V
V
V
mV
mV
l
1.5
4.4
l
2.5
3.5
4.85
0
±1
0.74 • V
VNTC
0.02 • V
VNTC
0.29 • V
VNTC
0.01 • V
VNTC
75
100
125
35
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
V
CC
is the greater of V
IN
, V
OUT
or V
BAT
.
Note 3:
Pins 1, 3 and 8 (OUT) should be tied together with a low
impedance to ensure that the difference between the three pins does not
exceed 50mV. Pins 2, 4 and 5 (BAT) should be tied together with a low
impedance to ensure that the difference between the three pins does not
exceed 50mV.
Note 4:
All voltage values are with respect to GND.
Note 5:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 6:
The LTC4066/LTC4066-1 are guaranteed to meet performance
specifications from 0°C to 70°C. Specifications over the –40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 7:
Guaranteed by long term current density limitations.
Note 8:
Total input current is equal to this specification plus 1.003
×
I
BAT
where I
BAT
is the charge current.
Note 9:
Accuracy of programmed current may degrade for currents greater
than 1.5A.
4066fc
4
LTC4066/LTC4066-1
TYPICAL PERFORMANCE CHARACTERISTICS
Input Supply Current
vs Temperature
900
800
700
600
I
IN
(μA)
500
400
300
200
10
100
0
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4066 G01
Input Supply Current vs
Temperature (Suspend Mode)
60
50
40
I
IN
(μA)
30
20
V
IN
= 5V
V
BAT
= 4.2V
R
PROG
= 100k
R
CLPROG
= 2k
SUSP = 5V
I
BAT
(μA)
70
60
50
40
30
20
10
Battery Drain Current vs
Temperature (BAT Powers OUT,
No Load)
V
IN
= 0V
V
BAT
= 4.2V
V
IN
= 5V
V
BAT
= 4.2V
R
PROG
= 100k
R
CLPROG
= 2k
0
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4066 G02
0
–50
–25
50
25
0
TEMPERATURE (°C)
75
100
4066 G03
Input Current Limit vs
Temperature, HPWP = 5V
525
V
IN
= 5V
V
BAT
= 3.7V
R
PROG
= 100k
515 R
CLPROG
= 2k
505
110
108
106
104
I
IN
(mA)
I
IN
(mA)
102
100
98
96
485
94
92
475
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4066 G04
Input Current Limit vs
Temperature, HPWR = 0V
V
IN
= 5V
V
BAT
= 3.7V
R
PROG
= 100k
R
CLPROG
= 2k
1200
1000
800
600
400
200
CLPROG Pin Voltage vs
Temperature
V
IN
= 5V
R
CLPROG
= 2k
HPWR = 5V
V
CLPROG
(mV)
495
HPWR = 0V
90
–50
–25
25
50
0
TEMPERATURE (°C)
75
100
4066 G05
0
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4066 G06
PROG Pin Voltage vs Temperatrue
1.020
1.015
1.010
V
FLOAT
(V)
V
IN
= 5V
R
PROG
= 100k
4.300
4.250
4.200
4.150
4.100
4.050
4.000
75
100
4066 G07
V
FLOAT
Load Regulation
R
PROG
= 34k
T
A
= 25°C
4.220
4.200
LTC4066
V
FLOAT
(V)
4.180
4.160
4.140
4.120
Battery Regulation (Float)
Voltage vs Temperature
V
IN
= 5V
LTC4066
V
PROG
(V)
1.005
1.000
0.995
LTC4066-1
LTC4066-1
4.100
4.080
–50
0.990
0.985
0.980
–50
–25
50
25
TEMPERATURE (°C)
0
0
250
500
750 1000
I
BAT
(mA)
1250
1500
–25
50
25
TEMPERATURE (°C)
0
75
100
4066 G09
4066 G08
4066fc
5
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