LTC4097
USB/Wall Adapter
Standalone Li-Ion/Polymer
Battery Charger
FEATURES
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DESCRIPTION
The LTC
®
4097 is a standalone linear battery charger that
is capable of charging a single-cell Li-Ion or Li-Polymer
battery from both wall adapter and USB inputs. The charger
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 LTC4097
terminates the charge cycle when the charge current drops
below the user programmed termination threshold after
the final float voltage is reached. The LTC4097 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, automatic recharge,
undervoltage lockout, charge status output, an NTC therm-
istor input used to monitor battery temperature and VNTC
power present output with 120mA drive capability.
, LT, LTC and LTM are registered trademarks 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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■
■
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Charges Single-Cell Li-Ion/Polymer Battery from
Wall Adapter and USB Inputs
Automatic Input Detection (Wall Adapter Input has
Charging Priority)
Charge Current Programmable up to 1.2A from
Wall Adapter Input
Programmable Charge Current Termination
NTC Thermistor Input for Temperature Qualified
Charging
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) 12-Lead (3mm
×
2mm) DFN Package
APPLICATIONS
■
■
■
Cellular Telephones
MP3 Players
Portable Handheld Devices
TYPICAL APPLICATION
Dual Input Battery Charger for Single-Cell Li-Ion Battery
LTC4097
WALL
ADAPTER
USB
PORT
1µF
1µF
2k
1%
BAT
DCIN
USBIN
IUSB
IDC
1.24k
1%
VNTC
HPWR
NTC
ITERM
GND
2k
1%
T
800mA (WALL)
100mA/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
4097f
+
4.2V
SINGLE CELL
Li-Ion BATTERY
BATTERY
CHARGE
VOLTAGE (V) CURRENT (mA)
CONSTANT VOLTAGE
USBIN = 5V
T
A
= 25°C
R
IDC
= 1.24k
R
IUSB
= 2k
HPWR = 5V
4097 TA01
DCIN
VOLTAGE (V)
4097 TA01b
1
LTC4097
ABSOLUTE MAXIMUM RATINGS
(Note 1,7)
PACKAGE/ORDER INFORMATION
TOP VIEW
DCIN 1
USBIN 2
VNTC 3
CHRG 4
SUSP 5
NTC 6
13
12 BAT
11 GND
10 IDC
9 IUSB
8 ITERM
7 HPWR
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, NTC, HPWR, SUSP ................... –0.3V to 6V
IDC, IUSB, ITERM ............................–0.3V to V
CC
+ 0.3V
BAT Short-Circuit Duration............................Continuous
VNTC Short-Circuit Duration .........................Continuous
DCIN, BAT 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
DDB PACKAGE
12-LEAD (3mm
×
2mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 60°C/W (Note 3)
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
ORDER PART NUMBER
LTC4097EDDB
DDB PART MARKING
LCRM
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, HPWR = 5V, NTC = 0V, 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
mA
µA
µA
µA
V
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
IUSB
= 2.1k, Constant-Current Mode, HPWR = 0V
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
Constant-Current Mode, R
IUSB
= 2k, HPWR = 0
R
ITERM
= 1k
R
ITERM
= 2k
R
ITERM
= 10k
V
BAT
< V
TRIKL
; R
IDC
= 1k
V
BAT
< V
TRIKL
; R
IUSB
= 2k
●
●
●
●
250
50
20
250
50
20
10
4.179
4.158
750
450
90
88
4.2
4.2
800
476
95
100
–5
–2
–5
1
1
0.2
88
42
6
85
42
100
50
9.5
100
50
800
100
40
800
100
40
20
4.221
4.242
850
500
100
112
–8
–4
–8
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
Trickle Charge Current
112
58
13
115
58
mA
mA
mA
mA
mA
4097f
I
TRIKL
2
LTC4097
ELECTRICAL CHARACTERISTICS
SYMBOL
V
TRIKL
V
UVDC
V
UVUSB
V
ASD-DC
V
ASD-USB
V
SUSP
, V
HPWR
R
SUSP
R
HPWR
V
⎯
C
⎯
H
⎯
R
⎯
G
ΔV
RECHRG
t
RECHRG
t
ITERM
R
ON-DC
R
ON-USB
T
LIM
I
VNTC
V
VNTC
I
NTC
V
NTC-COLD
V
NTC-HOT
V
NTC-DIS
PARAMETER
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, HPWR = 5V, NTC = 0V, R
IDC
= 1kΩ, R
IUSB
= 2kΩ,
R
ITERM
= 2kΩ unless otherwise noted.
CONDITIONS
●
MIN
2.8
4
3.8
5
5
TYP
2.9
135
4.22
200
4
200
30
100
30
150
MAX
3
4.4
4.2
55
55
0.5
UNITS
V
mV
V
mV
V
mV
mV
mV
mV
mV
V
V
MΩ
MΩ
Trickle Charge Threshold Voltage V
BAT
Rising
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
HPWR Pulldown Resistance
⎯
CH
⎯
R
⎯
G Output Low Voltage
⎯
Recharge Battery Threshold
Voltage
I
⎯
C
⎯
H
⎯
R
⎯
G
= 5mA
V
FLOAT
– V
RECHRG
●
●
●
1.2
3.4
3.4
62
70
100
1.6
3
420
470
115
V
VNTC
= 4.55V DCIN Powered
V
VNTC
= 4.8V USBIN Powered
I
VNTC
= 250µA
V
NTC
= 1V
Rising Threshold
Hysteresis
4.25
0
0.765 • V
VNTC
0.016 • V
VNTC
0.349 • V
VNTC
0.016 • V
VNTC
0.017 • V
VNTC
0.01 • V
VNTC
30
30
5.5
±1
150
130
mV
mV
ms
ms
mΩ
mΩ
°C
mA
mA
V
µA
V
V
V
V
V
V
Recharge Comparator Filter Time V
BAT
from High to Low
Termination Comparator Filter Time I
BAT
Drops Below Termination Threshold
Power FET “ON” Resistance
(Between DCIN and BAT)
Power FET “ON” Resistance
(Between USBIN and BAT)
Junction Temperature in
Constant-Temperature Mode
VNTC Pin Current
VNTC Bias Voltage
NTC Input Leakage Current
Cold Temperature Fault
Threshold Voltage
Hot Temperature Fault Threshold Falling Threshold
Voltage
Hysteresis
NTC Disable Threshold Voltage
NTC Input Voltage to GND (Falling)
Hysteresis
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 LTC4097 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 60°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
4097f
3
LTC4097
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
4097 G02
NTC = 0V, HPWR = 5V, 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
4097 G03
Battery Regulated Output (Float)
Voltage vs Charge Current
V
USBIN
= 5V
R
IUSB
= 2k
4097 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
4097 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
4097 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
4097 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)
4097 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
4097 G08
0.994
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4097 G09
4097f
4
LTC4097
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
NTC = 0V, HPWR = 5V, T
A
= 25°C,
unless otherwise noted.
Recharge Threshold Voltage
vs Temperature
120
115
110
105
100
95
90
85
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
4097 G10
4.50
4.75
5.00
V
USBIN
(V)
5.25
5.50
4097 G11
80
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4097 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
4097 G13
Charge Current vs Battery Voltage
600
575
550
I
BAT
(mA)
V
USBIN
= 5V
R
IUSB
= 2k
1200
Charge Current vs Ambient
Temperature with Thermal
Regulation
R
IDC
= 1k
1000
800
600 R
IUSB
= 2k
400
V
DCIN
= 5V
200 V
USBIN
= 5V
V
BAT
= 3.7V
θ
JA
= 60°C/W
0
–50 –25
0
25
50
75
TEMPERATURE (°C)
THERMAL REGULATION
V
DCIN
= 5V
R
IDC
= 1k
THERMAL REGULATION
525
500
475
450
425
400
3.0
3.2
3.4
3.6
V
BAT
(V)
3.8
4.0
4097 G14
100
125
4097 G15
Charge Current vs Supply Voltage
104
V
BAT
= 3.7V
1200
1000
102
I
BAT
(mA)
I
BAT
(mA)
R
IDC
= 10k
100
R
IUSB
= 10k
800
Charge Current vs Battery Voltage
600
THERMAL REGULATION
500
400
I
BAT
(mA)
300
200
V
DCIN
= 5V
R
IDC
= 1k
θ
JA
= 60°C/W
2.5
3.0
3.5
V
BAT
(V)
4.0
4.5
4097 G17
Charge Current vs Battery Voltage
600
400
98
200
96
4.25
0
2.0
100
0
2.0
V
USBIN
= 5V
R
IUSB
= 2k
θ
JA
= 60°C/W
2.5
3.0
3.5
V
BAT
(V)
4.0
4.5
4097 G18
4.50
5.00
V
DCIN
, V
USBIN
(V)
4.75
5.25
5.50
4097 G16
4097f
5
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