LTC4075/LTC4075X
Dual Input USB/AC
Adapter Standalone Li-Ion
Battery Chargers
FEATURES
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DESCRIPTIO
Charges Single-Cell Li-Ion Batteries from Wall
Adapter and USB Inputs
Automatic Input Power Detection and Selection
Charge Current Programmable up to 950mA from
Wall Adapter Input
No External MOSFET, Sense Resistor or Blocking
Diode Needed
Thermal Regulation Maximizes Charging Rate
Without Risk of Overheating*
Preset Charge Voltage with ±0.6% Accuracy
Programmable Charge Current Termination
18µA USB Suspend Current in Shutdown
Independent “Power Present” Status Outputs
Charge Status Output
Automatic Recharge
Available Without Trickle Charge (LTC4075X)
Available in a Thermally Enhanced, Low Profile
(0.75mm) 10-Lead (3mm
×
3mm) DFN Package
The LTC
®
4075/LTC4075X are standalone linear chargers
that are capable of charging a single-cell Li-Ion battery
from both wall adapter and USB inputs. The chargers can
detect power at the inputs and automatically select the
appropriate power source for charging.
No external sense resistor or blocking diode is required
for charging due to the internal MOSFET architecture.
Internal thermal feedback regulates the battery charge
current to maintain a constant die temperature during high
power operation or high ambient temperature conditions.
The float voltage is fixed at 4.2V and the charge current
is programmed with an external resistor. The LTC4075
terminates the charge cycle when the charge current drops
below the programmed termination threshold after the
final float voltage is reached. With power applied to both
inputs, the LTC4075/LTC4075X can be put into shutdown
mode reducing the DCIN supply current to 20µA, the USBIN
supply current to 10µA, and the battery drain current to
less than 2µA.
Other features include automatic recharge, undervoltage
lockout, charge status outputs, and “power present”
status outputs to indicate the presence of wall adapter
or USB power.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Protected by U.S. patents, including 6522118, 6700364
APPLICATIO S
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Cellular Telephones
Handheld Computers
Portable MP3 Players
Digital Cameras
TYPICAL APPLICATIO
WALL
ADAPTER
USB
PORT
1µF
1µF
LTC4075
DCIN
USBIN
IUSB
Complete Charge Cycle (1100mAh Battery)
1000
800
600
400
200
0
4.2
4.0
3.8
3.6
3.4
5.0
2.5
0
–2.5
0
0.5
1.0
2.0
1.5
TIME (HR)
2.5
3.0
4075Xfa
4075 TA01b
Dual Input Battery Charger for Single-Cell Li-Ion
800mA (WALL)
500mA (USB)
BAT
BATTERY
CHARGE
VOLTAGE (V) CURRENT (mA)
+
2k
1%
4075 TA01
DCIN
VOLTAGE (V)
2k
IDC
1% 1.24k
1%
4.2V
SINGLE CELL
Li-Ion BATTERY
ITERM
GND
U
CONSTANT VOLTAGE
USBIN = 5V
T
A
= 25°C
R
IDC
= 1.25k
R
IUSB
= 2k
U
U
1
LTC4075/LTC4075X
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
USBIN
IUSB
ITERM
PWR
CHRG
1
2
3
4
5
11
10 DCIN
9 BAT
8 IDC
7 USBPWR
6 ENABLE
Input Supply Voltage (DCIN, USBIN) ........... –0.3 to 10V
ENABLE,
⎯
C
⎯
H
⎯
R
⎯
G,
⎯
P
⎯
W
⎯
R, USBPWR ................. –0.3 to 10V
BAT, IDC, IUSB, ITERM .................................. –0.3 to 7V
DCIN Pin Current (Note 7) ..........................................1A
USBIN Pin Current (Note 7) .................................700mA
BAT Pin Current (Note 7) ............................................1A
BAT Short-Circuit Duration............................Continuous
Maximum Junction Temperature .......................... 125
°
C
Operating Temperature Range (Note 2) .. –40
°
C to 85
°
C
Storage Temperature Range.................. –65
°
C to 125
°
C
DD PACKAGE
10-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 40°C/W (NOTE 3)
EXPOSED PAD IS GND (PIN 11)
MUST BE SOLDERED TO PCB
ORDER PART NUMBER
LTC4075EDD
LTC4075XEDD
DD PART MARKING
LBSC
LBRK
Order Options
Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
SYMBOL
V
DCIN
V
USBIN
I
DCIN
PARAMETER
Supply Voltage
Supply Voltage
DCIN Supply Current
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
DCIN
= 5V, V
USBIN
= 5V unless otherwise noted.
CONDITIONS
●
●
MIN
4.3
4.3
TYP
MAX
8
8
800
100
40
800
100
36
20
4.225
4.242
840
500
107
–6
–2
±2
1.05
1.05
110
55
11.5
6
UNITS
V
V
µA
µA
µA
µA
µA
µA
µA
V
V
mA
mA
mA
µA
µA
µA
V
V
mA
mA
mA
mA
Charge Mode (Note 4), R
IDC
= 10k
Standby Mode; Charge Terminated
Shutdown Mode (ENABLE = 5V)
Charge Mode (Note 5), R
IUSB
= 10k, V
DCIN
= 0V
Standby Mode; Charge Terminated, V
DCIN
= 0V
Shutdown (V
DCIN
= 0V, ENABLE = 0V)
V
DCIN
> V
USBIN
I
BAT
= 1mA
I
BAT
= 1mA, 0°C < T
A
< 85°C
R
IDC
= 1.25k, Constant-Current Mode
R
IUSB
= 2.1k, Constant-Current Mode
R
IDC
= 10k or R
IUSB
= 10k
Standby Mode, Charge Terminated
Shutdown Mode (Charger Disabled)
Sleep Mode (V
DCIN
= 0V, V
USBIN
= 0V)
Constant-Current Mode
Constant-Current Mode
R
ITERM
= 1k
R
ITERM
= 2k
R
ITERM
= 10k
R
ITERM
= 20k
●
●
●
●
250
50
20
250
50
18
10
4.175
4.158
760
450
93
4.2
4.2
800
476
100
–3
–1
±1
1
1
100
50
10
5
I
USBIN
USBIN Supply Current
V
FLOAT
I
BAT
Regulated Output (Float) Voltage
BAT Pin Current
●
●
●
V
IDC
V
IUSB
I
TERMINATE
IDC Pin Regulated Voltage
IUSB Pin Regulated Voltage
Charge Current Termination Threshold
●
●
●
●
0.95
0.95
90
45
8.5
4
4075Xfa
2
U
W
U
U
W W
W
LTC4075/LTC4075X
ELECTRICAL CHARACTERISTICS
SYMBOL
I
TRIKL
V
TRIKL
V
UVDC
V
UVUSB
V
ASD-DC
V
ASD-USB
V
ENABLE
R
ENABLE
V
⎯
C
⎯
H
⎯
R
⎯
G
V
⎯
P
⎯
W
⎯
R
V
USBPWR
ΔV
RECHRG
t
RECHRG
t
TERMINATE
t
SS
R
ON-DC
R
ON-USB
T
LIM
PARAMETER
Trickle Charge Current (Note 6)
Trickle Charge Threshold (Note 6)
DCIN Undervoltage Lockout Voltage
USBIN Undervoltage Lockout Voltage
V
DCIN
– V
BAT
Lockout Threshold
V
USBIN
– V
BAT
Lockout Threshold
ENABLE Input Threshold Voltage
ENABLE Pulldown Resistance
⎯
C
⎯
H
⎯
R
⎯
G Output Low Voltage
⎯
P
⎯
W
⎯
R Output Low Voltage
USBPWR Output Low Voltage
Recharge Battery Threshold
Recharge Comparator Filter Time
Termination Comparator Filter Time
Soft-Start Time
Power FET “ON” Resistance
(Between DCIN and BAT)
Power FET “ON” Resistance
(Between USBIN and BAT)
Junction Temperature in
Constant-Temperature Mode
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
DCIN
= 5V, V
USBIN
= 5V unless otherwise noted.
CONDITIONS
V
BAT
< V
TRIKL
; R
IDC
= 1.25k
V
BAT
< V
TRIKL
; R
IUSB
= 2.1k
V
BAT
Rising
Hysteresis
From Low to High
Hysteresis
From Low to High
Hysteresis
V
DCIN
from Low to High, V
BAT
= 4.2V
V
DCIN
from High to Low, V
BAT
= 4.2V
V
USBIN
from Low to High, V
BAT
= 4.2V
V
USBIN
from High to Low, V
BAT
= 4.2V
●
MIN
60
30
2.8
4
3.8
140
20
140
20
0.4
1.2
TYP
80
47.5
2.9
100
4.15
200
3.95
200
180
50
180
50
0.7
2
0.35
0.35
0.35
100
6
1.5
250
400
550
105
MAX
100
65
3
4.3
4.1
220
80
220
80
1
5
0.6
0.6
0.6
135
9
2.2
325
UNITS
mA
mA
V
mV
V
mV
V
mV
mV
mV
mV
mV
V
MΩ
V
V
V
mV
ms
ms
µs
mΩ
mΩ
°C
I
⎯
C
⎯
H
⎯
R
⎯
G
= 5mA
I
⎯
P
⎯
W
⎯
R
= 5mA
I
USBPWR
= 300µA
V
FLOAT
– V
RECHRG
, 0°C < T
A
< 85°C
V
BAT
from High to Low
I
BAT
Drops Below Termination Threshold
I
BAT
= 10% to 90% Full-Scale
65
3
0.8
175
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
The LTC4075E/LTC4075XE are guaranteed to meet the
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 3:
Failure to correctly solder the exposed backside of the package to
the PC board will result in a thermal resistance much higher than 40°C/W.
See Thermal Considerations.
Note 4:
Supply current includes IDC and ITERM pin current (approximately
100µA each) but does not include any current delivered to the battery
through the BAT pin.
Note 5:
Supply current includes IUSB and ITERM pin current
(approximately 100µA each) but does not include any current delivered to
the battery through the BAT pin.
Note 6:
This parameter is not applicable to the LTC4075X.
Note 7:
Guaranteed by long term current density limitations.
4075Xfa
3
LTC4075/LTC4075X
TYPICAL PERFOR A CE CHARACTERISTICS
Regulated Output (Float) Voltage
vs Charge Current
4.26
4.24
4.22
V
FLOAT
(V)
V
FLOAT
(V)
4.20
4.18
4.16
4.14
4.12
4.10
0
100 200 300 400 500 600 700 800
CHARGE CURRENT (mA)
4075X G01
V
DCIN
= V
USBIN
= 5V
4.200
4.195
4.190
4.185
4.180
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4075X G02
V
IDC
(V)
R
IDC
= R
IUSB
= 2k
R
IDC
= 1.25k
IUSB Pin Voltage vs Temperature
(Constant-Current Mode)
1.008
1.006
1.004
V
IUSB
(V)
I
BAT
(mA)
1.002
V
USBIN
= 8V
1.000
0.998
0.996
0.994
0.992
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
V
USBIN
= 4.3V
900
800
700
600
500
400
300
200
100
0
I
BAT
(mA)
⎯
P
⎯
W
⎯
R Pin I-V Curve
35
V
DCIN
= V
USBIN
= 5V
30
25
I
PWR
(mA)
20
15
10
5
0
0
1
2
4
3
V
PWR
(V)
5
6
7
T
A
= – 40°C
T
A
= 25°C
I
CHRG
(mA)
T
A
= 90°C
35
30
25
20
15
10
5
0
T
A
= 90°C
I
USBPWR
(mA)
4
U W
4075X G04
4075X G07
Regulated Output (Float) Voltage
vs Temperature
4.220
4.215
4.210
4.205
V
DCIN
= V
USBIN
= 5V
1.008
1.006
1.004
1.002
1.000
0.998
0.996
0.994
IDC Pin Voltage vs Temperature
(Constant-Current Mode)
V
DCIN
= 8V
V
DCIN
= 4.3V
0.992
–50
–25
25
0
50
TEMPERATURE (°C)
75
100
4075X G03
Charge Current vs IDC Pin
Voltage
V
DCIN
= 5V
R
IDC
= 1.25k
900
800
700
600
R
IDC
= 2k
500
400
300
200
R
IDC
= 10k
100
0
0
0.2
0.4
0.6
0.8
V
IDC
(V)
1.0
1.2
Charge Current vs IUSB Pin
Voltage
V
USBIN
= 5V
R
IUSB
= 1.25k
R
IUSB
= 2k
R
IUSB
= 10k
0
0.2
0.4
0.6
0.8
V
IUSB
(V)
1.0
1.2
4075X G05
4075X G06
⎯
CH
⎯
R
⎯
G Pin I-V Curve
⎯
V
DCIN
= V
USBIN
= 5V
6
T
A
= – 40°C
5
T
A
= 25°C
4
3
2
1
0
USBPWR Pin I-V Curve
V
DCIN
= 5V
V
USBIN
= 0V
T
A
= – 40°C
T
A
= 25°C
T
A
= 90°C
0
1
2
4
3
V
CHRG
(V)
5
6
7
0
1
2
4
3
5
V
USBPWR
(V)
6
7
4075X G08
4075X G09
4075Xfa
LTC4075/LTC4075X
TYPICAL PERFOR A CE CHARACTERISTICS
Charge Current vs Ambient
Temperature
1000
ONSET OF
THERMAL REGULATION
800
R
IDC
= 1.25k
700
I
BAT
(mA)
I
BAT
(mA)
600
500
200
V
DCIN
= V
USBIN
= 5V
V
BAT
= 4V
θ
JA
= 40°C/W
50
25
75
0
TEMPERATURE (°C)
100
125
400
R
IDC
= 1.25k
V
BAT
= 4V
θ
JA
= 35°C/W
5.0
5.5 6.0 6.5
V
DCIN
(V)
7.0
7.5
8.0
200
LTC4075
0
2.4
2.7
3.0
3.3 3.6
V
BAT
(V)
3.9
4.2
4.5
V
DCIN
= V
USBIN
= 5V
θ
JA
= 40°C/W
R
IDC
= 1.25k
I
BAT
(mA)
600
R
IDC
= R
IUSB
= 2k
600
900
800
400
0
–50 –25
DCIN Power FET “On” Resistance
vs Temperature
550
500
700
R
DS(ON)
(mΩ)
R
DS(ON)
(mΩ)
450
400
350
300
400
250
–50 –25
50
25
75
0
TEMPERATURE (°C)
100
125
650
600
550
500
450
V
BAT
= 4V
I
BAT
= 200mA
800
750
V
ENABLE
(mV)
DCIN Shutdown Current vs
Temperature
50
45
40
35
I
DCIN
(µA)
30
25
20
15
10
5
0
–50
–25
V
DCIN
= 5V
V
DCIN
= 8V
I
USBIN
(µA)
45
40
35
25
20
15
V
USBIN
= 5V
R
ENABLE
(MΩ)
V
DCIN
= 4.3V
ENABLE = 5V
50
25
0
TEMPERATURE (°C)
75
100
4075X G16
U W
4075X G10
4075X G13
Charge Current vs
Supply Voltage
1000
ONSET OF
THERMAL REGULATION
800
Charge Current vs Battery Voltage
LTC4075X
400
300
4.0 4.5
4075X G11
4075X G12
USBIN Power “On” Resistance
vs Temperature
V
BAT
= 4V
I
BAT
= 200mA
900
ENABLE Pin Threshold (On-to-Off)
vs Temperature
V
DCIN
= V
USBIN
= 5V
850
800
750
700
650
350
–50 –25
50
25
75
0
TEMPERATURE (°C)
100
125
600
–50
–25
50
25
0
TEMPERATURE (°C)
75
100
4075X G14
4075X G15
USBIN Shutdown Current vs
Temperature
2.8
2.6
V
USBIN
= 8V
2.4
2.2
2.0
1.8
ENABLE = 0V
–25
50
25
0
TEMPERATURE (°C)
75
100
ENABLE Pin Pulldown Resistance
vs Temperature
30
10
5
V
USBIN
= 4.3V
0
–50
1.6
–50
–25
50
25
0
TEMPERATURE (°C)
75
100
4075X G17
4075X G18
4075Xfa
5
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