LTC4096/LTC4096X
Dual Input Standalone
Li-Ion Battery Chargers
FEATURES
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DESCRIPTION
The LTC
®
4096/LTC4096X are standalone linear chargers
that are capable of charging a single-cell Li-Ion or Li-Poly-
mer 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 LTC4096
terminates the charge cycle when the charge current drops
below the user programmed termination threshold after
the final float voltage is reached. The LTC4096 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 even with power applied
to both inputs.
Other features include trickle charge (LTC4096 only), auto-
matic recharge, undervoltage lockout, charge status output
and power present output with 120mA drive capability.
, 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.
Charges Single-Cell Li-Ion Battery from Wall
Adapter and USB Inputs
Automatic Input Detection (DC Input has Charging
Priority)
Charge Current Programmable up to 1.2A from
Wall Adapter Input
C/X Charge Current Termination
Input Power Present Output (PWR) with 120mA
Drive Capability
Independent DC, USB Charge Current Programming
Preset Float Voltage with ±0.6% Accuracy
Thermal Regulation Maximizes Charge Rate Without
Risk of Overheating*
Charge Status Output
Automatic Recharge
20µA Charger Quiescent Current in Shutdown
Available in a Thermally Enhanced, Low Profile
(0.75mm) 10-Lead (3mm
×
3mm) DFN Package
APPLICATIONS
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Cellular Telephones
MP3 Players
Portable Handheld Devices
TYPICAL APPLICATION
Dual Input Battery Charger for Single-Cell Li-Ion Battery
WALL
ADAPTER
USB
PORT
1
m
F
1
m
F
LTC4096
DCIN
USBIN
ON OFF
SUSP
IDC
1.24k
2k
IUSB
CHRG
ITERM
GND
BAT
PWR
1k
800mA (WALL)
500mA (USB)
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
0
0.5
1.0
2.0
1.5
TIME (HR)
2.5
3.0
4096xf
+
4.2V
Li-Ion
BATTERY
BATTERY
CHARGE
VOLTAGE (V) CURRENT (mA)
CONSTANT VOLTAGE
USBIN = 5V
T
A
= 25°C
R
IDC
= 1.24k
R
IUSB
= 2k
4096 TA01
DCIN
VOLTAGE (V)
2k
4096 TA01b
1
LTC4096/LTC4096X
ABSOLUTE MAXIMUM RATINGS
(Note 1,7)
PACKAGE/ORDER INFORMATION
TOP VIEW
DCIN
USBIN
PWR
CHRG
SUSP
1
2
3
4
5
11
10 BAT
9 IDC
8 GND
7 IUSB
6 ITERM
V
DCIN
, V
USBIN
t < 1ms and Duty Cycle < 1% .................. –0.3V to 7V
Steady State............................................. –0.3V to 6V
BAT,
⎯
C
⎯
H
⎯
R
⎯
G, SUSP ........................................ –0.3V to 6V
IDC, IUSB, ITERM ...........................–0.3V to VCC + 0.3V
BAT Short-Circuit Duration............................Continuous
PWR Short-Circuit Duration ..........................Continuous
BAT, DCIN Pin Current (Note 6)..............................1.25A
USBIN Pin Current (Note 6) .....................................1.1A
IDC, IUSB, ITERM Pin Current ............................1.25mA
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 (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ORDER PART NUMBER
LTC4096EDD
LTC4096XEDD
DD PART MARKING
LCSJ
LCLM
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
Adapter Supply Voltage
USB 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, R
IDC
= 1kΩ, R
IUSB
= 2kΩ, R
ITERM
= 2kΩ unless
otherwise noted.
CONDITIONS
●
●
●
●
●
●
MIN
4.25
4.25
TYP
MAX
5.5
5.5
UNITS
V
V
µA
µA
µA
µA
µA
µA
µA
V
V
mA
mA
mA
µA
µA
µA
V
V
Charge Mode (Note 4), R
IDC
= 10k
Standby Mode; Charge Terminated
Shutdown Mode (SUSP = 5V)
Charge Mode (Note 5), R
IUSB
= 10k, V
DCIN
= 0V
Standby Mode; Charge Terminated, V
DCIN
= 0V
Shutdown (V
DCIN
= 0V, SUSP = 5V)
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, R
IDC
= 1.25k
Constant-Current Mode, R
IUSB
= 2k
250
50
20
250
50
20
10
4.179
4.158
750
450
88
4.2
4.2
800
476
100
–5
–2
–5
1
1
800
100
40
800
100
40
20
4.221
4.242
850
500
112
–8
–4
–8
I
USBIN
USBIN Supply Current
V
FLOAT
I
BAT
Regulated Output (Float) Voltage
BAT Pin Current
V
IDC
V
IUSB
IDC Pin Regulated Voltage
IUSB Pin Regulated Voltage
4096xf
2
LTC4096/LTC4096X
ELECTRICAL CHARACTERISTICS
SYMBOL
I
TERMINATE
PARAMETER
Charge Current Termination
Threshold
Trickle Charge Current
(LTC4096 Only)
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, R
IDC
= 1kΩ, R
IUSB
= 2kΩ, R
ITERM
= 2kΩ unless
otherwise noted.
CONDITIONS
R
ITERM
= 1k
R
ITERM
= 2k
R
ITERM
= 10k
V
BAT
< V
TRIKL
; R
IDC
= 1k
V
BAT
< V
TRIKL
; R
IUSB
= 2k
●
MIN
88
42
6
85
42
2.8
4
3.8
5
5
TYP
100
50
9.5
100
50
2.9
135
4.22
200
4
200
30
100
30
150
MAX
112
58
13
115
58
3
4.4
4.2
55
55
0.5
UNITS
mA
mA
mA
mA
mA
V
mV
V
mV
V
mV
mV
mV
mV
mV
V
V
MΩ
mV
mV
ms
ms
mΩ
mΩ
Ω
Ω
°C
I
TRIKL
V
TRIKL
V
UVDC
V
UVUSB
V
ASD-DC
V
ASD-USB
V
SUSP
R
SUSP
V
⎯
C
⎯
H
⎯
R
⎯
G
ΔV
RECHRG
t
RECHRG
t
TERMINATE
R
ON-DC
R
ON-USB
R
DC-PWR
R
USB-PWR
T
LIM
Trickle Charge Threshold Voltage V
BAT
Rising
(LTC4096 Only)
Hysteresis
DCIN Undervoltage Lockout
Voltage
USBIN Undervoltage Lockout
Voltage
V
DCIN
– V
BAT
Lockout Threshold
Voltage
From Low to High
Hysteresis
From Low to High
Hysteresis
V
DCIN
from High to Low, V
BAT
= 4.3V
V
DCIN
from Low to High, V
BAT
= 4.3V
V
USBIN
– V
BAT
Lockout Threshold V
USBIN
from High to Low, V
BAT
= 4.3V
Voltage
V
USBIN
from Low to High, V
BAT
= 4.3V
V
IL
, Logic Low Voltage
V
IH
, Logic High Voltage
SUSP Pulldown Resistance
⎯
C
⎯
H
⎯
R
⎯
G Output Low Voltage
Recharge Battery Threshold
Voltage
Termination Comparator Filter
Time
Power FET “ON” Resistance
(Between DCIN and BAT)
Power FET “ON” Resistance
(Between USBIN and BAT)
Power FET “ON” Resistance
(Between DCIN and PWR)
Power FET “ON” Resistance
(Between USBIN and PWR)
Junction Temperature in
Constant-Temperature Mode
V
DCIN
= 5V, V
USBIN
= 0V
V
DCIN
= 0V, V
USBIN
= 5V
I
⎯
C
⎯
H
⎯
R
⎯
G
= 5mA
V
FLOAT
– V
RECHRG
●
●
1.2
1.3
30
3.4
62
50
1.6
3
420
470
15
6.6
115
7
150
80
Recharge Comparator Filter Time V
BAT
from High to Low
I
BAT
Drops Below Termination Threshold
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:
The LTC4096 is guaranteed to meet the performance specifications
from 0°C to 85°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 Pad 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:
Guaranteed by long term current density limitations.
Note 7:
V
CC
is greater of DCIN or USBIN
4096xf
3
LTC4096/LTC4096X
TYPICAL PERFORMANCE CHARACTERISTICS
Battery Regulated Output (Float)
Voltage vs Charge Current
4.26
4.24
4.22
V
BAT
(V)
V
BAT
(V)
4.20
4.18
4.16
4.14
4.12
4.10
0
200
400
600
800 1000
CHARGE CURRENT (mA)
1200
V
DCIN
= 5V
R
IDC
= 1k
4.26
4.24
4.22
V
BAT
(V)
4.20
4.18
4.16
4.14
4.12
4.10
0
100
300
400
500
CHARGE CURRENT (mA)
200
600
4096 G02
T
A
= 25°C, unless otherwise noted.
Battery Regulated Output (Float)
Voltage vs Temperature
4.215
V
DCIN
= 5V
R
IDC
= 1k
4.210
V
USBIN
= 5V
= 2k
R
4.205
IUSB
4.200
4.195
4.190
4.185
4.180
4.175
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4096 G03
Battery Regulated Output (Float)
Voltage vs Charge Current
V
USBIN
= 5V
R
IUSB
= 2k
4096 G01
Battery Regulated Output (Float)
Voltage vs DCIN Voltage
4.26
4.24
4.22
V
BAT
(V)
V
BAT
(V)
4.20
4.18
4.16
4.14
4.12
4.10
4.25
4.50
4.75
5.00
V
DCIN
(V)
5.25
5.50
4096 G04
Battery Regulated Output (Float)
Voltage vs USBIN Voltage
4.26
4.24
4.22
I
BAT
(mA)
4.20
4.18
4.16
4.14
4.12
4.10
4.25
4.50
4.75
5.00
V
USBIN
(V)
5.25
5.50
4096 G05
Charge Current vs IDC Pin
Voltage
1200
1000
800
600
400
200
0
0
0.2
0.4
0.6
0.8
V
IDC
(V)
1.0
1.2
4096 G06
I
BAT
= 10mA
R
IDC
= 1k
I
BAT
= 10mA
R
IUSB
= 2k
V
DCIN
= 5V
R
IDC
= 1k
Charge Current vs IUSB Pin
Voltage
600
500
400
I
BAT
(mA)
300
200
100
0
0
0.2
0.4
0.6
V
IUSB
(V)
4096 G07
IDC Pin Voltage vs Temperature
(Constant-Current Mode)
1.006
1.004
1.002
1.000
0.998
0.996
0.994
–50
V
IUSB
(V)
V
IDC
(V)
V
DCIN
= 5V
R
IDC
= 10k
1.006
1.004
1.002
1.000
0.998
0.996
IUSB Pin Voltage vs Temperature
(Constant-Current Mode)
V
USBIN
= 5V
R
IUSB
= 10k
V
USBIN
= 5V
R
IUSB
= 2k
0.8
1.0
1.2
–25
0
25
50
TEMPERATURE (°C)
75
100
4096 G08
0.994
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4096 G09
4096xf
4
LTC4096/LTC4096X
TYPICAL PERFORMANCE CHARACTERISTICS
IDC Pin Voltage vs V
DCIN
(Constant-Current Mode)
1.006
1.004
1.002
1.000
0.998
0.996
0.994
4.25
V
IUSB
(V)
V
IDC
(V)
V
BAT
= 3.7V
R
IDC
= 10k
1.006
1.004
∆V
RECHRG
(mV)
1.002
1.000
0.998
0.996
0.994
4.25
T
A
= 25°C, unless otherwise noted.
Recharge Threshold Voltage
vs Temperature
70
65
60
55
50
45
40
35
V
DCIN
= V
USBIN
= 5V
IUSB Pin Voltage vs V
USBIN
(Constant-Current Mode)
V
BAT
= 3.7V
R
IUSB
= 10k
4.50
4.75
5.00
V
DCIN
(V)
5.25
5.50
4096 G10
4.50
4.75
5.00
V
USBIN
(V)
5.25
5.50
4096 G11
30
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4096 G12
Charge Current vs Battery Voltage
1200
1150
1100
I
BAT
(mA)
I
BAT
(mA)
1050
1000
950
900
850
800
3.0
3.2
3.4
3.6
V
BAT
(V)
3.8
4.0
4096 G13
Charge Current vs Battery Voltage
600
575
550
I
BAT
(mA)
525
500
475
450
425
400
3.0
3.2
3.4
3.6
V
BAT
(V)
3.8
4.0
4096 G14
Charge Current vs Ambient
Temperature with Thermal
Regulation
1200
R
IDC
= 1k
1000
800
600 R
IUSB
= 2k
400
200 V
DCIN
= V
USBIN
= 5V
V
BAT
= 3.7V
θ
JA
= 40°C/W
0
–50 –25
0
25
50
75
TEMPERATURE (°C)
THERMAL REGULATION
V
DCIN
= 5V
R
IDC
= 1k
V
USBIN
= 5V
R
IUSB
= 2k
100
125
4096 G15
Charge Current vs Supply Voltage
104
V
BAT
= 3.7V
1200
Charge Current vs Battery Voltage
600
LTC4096X
1000
500
400
I
BAT
(mA)
300
200
V
DCIN
= 5V
R
IDC
= 1k
θ
JA
= 40°C/W
3.0
3.5
V
BAT
(V)
4.0
4.5
4096 G17
Charge Current vs Battery Voltage
LTC4096X
102
I
BAT
(mA)
I
BAT
(mA)
R
IDC
= 10k
100
R
IUSB
= 10k
800
600
400
98
200
96
4.25
0
2.0
LTC4096
2.5
100
LTC4096
0
2.0
2.5
V
USBIN
= 5V
R
IUSB
= 2k
θ
JA
= 40°C/W
3.0
3.5
V
BAT
(V)
4.0
4.5
4096 G18
4.50
5.00
V
DCIN
, V
USBIN
(V)
4.75
5.25
5.50
4096 G16
4096xf
5
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