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LTC4078EDD#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC4078/LTC4078X
1
4078xfb
FEATURES
APPLICATIONS
DESCRIPTION
Dual Input Li-Ion Battery
Charger with Overvoltage Protection
The LTC
®
4078/LTC4078X are standalone linear chargers
that are capable of charging a single-cell Li-Ion/Polymer
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. The
LTC4078/LTC4078X feature a maximum 22V rating for both
wall adapter and USB inputs, although charging stops if
the selected power source exceeds the overvoltage limit.
Internal thermal feedback regulates the battery charge
current to maintain a constant die temperature during
high power operation or high ambient temperature con-
ditions. The fl oat voltage is fi xed at 4.2V and the charge
current is programmed with an external resistor. The
LTC4078/LTC4078X terminate the charge cycle when the
charge current drops below the programmed termination
threshold after the fi nal fl oat voltage is reached.
Other features include battery present detection, automatic
recharge, undervoltage lockout, charge status outputs, and
“power present” status outputs to indicate the presence of
wall adapter or USB power. The device is offered in a low
profi le (0.75mm) 3mm × 3mm 10-lead DFN package.
n
22V Maximum Voltage for Wall Adapter and
USB Inputs
n
Charge Single-Cell Li-Ion Batteries from Wall
Adapter and USB Inputs
n
Automatic Input Power Detection and Selection
n
Charge Current Programmable Up to 950mA from
Wall Adapter Input
n
Overvoltage Lockout for Wall Adapter and USB Inputs
n
Battery Detection Input Disables Charger When No
Battery is Present
n
No External MOSFET, Sense Resistor or Blocking
Diode Needed
n
Thermal Regulation Maximizes Charge Rate Without
Risk of Overheating*
n
Preset Charge Voltage with ±0.6% Accuracy
n
Programmable Charge Current Termination
n
40μA USB Suspend Current in Shutdown
n
Charge Status Output
n
Automatic Recharge
n
Available Without Trickle Charge (LTC4078X)
n
Available in a Thermally Enhanced, Low Profi le
(0.75mm) 10-Lead (3mm × 3mm) DFN Package
n
Cellular Telephones
n
Handheld Computers
n
Portable MP3 Players
n
Digital Cameras
High Voltage Dual Input Battery Charger
for Li-Ion Battery Pack
Charger Current vs Supply Voltage
L, 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, 6700364.
TYPICAL APPLICATION
LTC4078
DCIN
USBIN
IUSB
IDC
BAT
ITERM
BATDET
1.24k
1%
3.9k
2k
1%
2k
1%
WALL
ADAPTER
USB
PORT
1μF
1μF
+
4.2V
Li-Ion
BATTERY
PACK
800mA (WALL)
500mA (USB)
4078X TA01
GND
SUPPLY VOLTAGE (V)
2
I
BAT
(mA)
900
800
700
600
500
400
300
200
100
0
19345678 20
4078x TA01b
R
IDC
= 1.24k
R
IUSB
= 2k
V
BAT
= 3.5V
V
BATDET
= 0V
CHARGE FROM DCIN
CHARGE
FROM USBIN
LTC4078/LTC4078X
2
4078xfb
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
Input Supply Voltage (DCIN, USBIN) ............–0.3 to 22V
ENABLE, CHRG, PWR, BATDET, BAT ...............–0.3 to 6V
IDC, IUSB, ITERM Pin Current .................................1mA
DCIN, USBIN, BAT Pin Current ....................................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
(Note 1)
TOP VIEW
DD PACKAGE
10-LEAD
(
3mm × 3mm
)
PLASTIC DFN
10
9
6
7
811
4
5
3
2
1
DCIN
BAT
IDC
BATDET
ENABLE
USBIN
IUSB
ITERM
PWR
CHRG
T
JMAX
= 125°C, θ
JA
= 40°C/W (Note 3)
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
DCIN
= 5V, V
USBIN
= 5V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
DCIN
Operating Supply Voltage
l
4.3 5.5 V
V
USBIN
Operating Supply Voltage
l
4.3 5.5 V
I
DCIN
DCIN Supply Current Charge Mode (Note 4), R
IDC
= 10k
Standby Mode; Charge Terminated
Shutdown Mode (ENABLE = 5V)
Overvoltage Mode (V
DCIN
= 10V)
l
l
350
70
40
70
800
120
80
140
μA
μA
μA
μA
I
USBIN
USBIN Supply Current Charge Mode (Note 5), R
IUSB
= 10k, V
DCIN
= 2V
Standby Mode; Charge Terminated, V
DCIN
= 2V
Shutdown (V
DCIN
= 2V, ENABLE = 0V)
Overvoltage Mode (V
USBIN
= 10V)
V
DCIN
> V
USBIN
l
l
350
70
40
70
23
800
120
80
140
40
μA
μA
μA
μA
μA
V
FLOAT
Regulated Output (Float) Voltage I
BAT
= 1mA
I
BAT
= 1mA, 0°C < T
A
< 85°C
4.185
4.165
4.2
4.2
4.215
4.235
V
V
I
BAT
BAT Pin Current 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)
l
l
l
770
455
93
800
476
100
–7.5
–7.5
–7.5
830
495
107
–12
–12
–12
mA
mA
mA
μA
μA
μA
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4078XEDD#PBF LTC4078XEDD#TRPBF LCYP
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
LTC4078EDD#PBF LTC4078EDD#TRPBF LDJY
10-Lead (3mm × 3mm) Plastic DFN
–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/
ORDER INFORMATION
ELECTRICAL CHARACTERISTICS
LTC4078/LTC4078X
3
4078xfb
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 LTC4078/LTC4078X are guaranteed to meet the performance
specifi cations from 0°C to 85°C. Specifi cations 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 LTC4078X.
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
DCIN
= 5V, V
USBIN
= 5V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IDC
IDC Pin Regulated Voltage Constant-Current Mode 1 V
V
IUSB
IUSB Pin Regulated Voltage Constant-Current Mode 1 V
I
TERMINATE
Charge Current Termination Threshold R
ITERM
= 1k
R
ITERM
= 2k
R
ITERM
= 10k
R
ITERM
= 20k
l
l
l
l
90
42
8
3.5
100
50
10
5
110
58
12
6.5
mA
mA
mA
mA
I
TRIKL
Trickle Charge Current (Note 6) V
BAT
< V
TRIKL
; R
IDC
= 1.25k
V
BAT
< V
TRIKL
; R
IUSB
= 2.1k
60
30
80
47.5
100
65
mA
mA
V
TRIKL
Trickle Charge Threshold (Note 6) V
BAT
Rising
Hysteresis
2.8 2.9
100
3V
mV
V
UVDC
DCIN Undervoltage Lockout Voltage From Low to High
Hysteresis
4 4.15
190
4.3 V
mV
V
UVUSB
USBIN Undervoltage Lockout Voltage From Low to High
Hysteresis
3.8 3.95
170
4.1 V
mV
V
OVDC
DCIN Overvoltage Lockout Voltage From Low to High
Hysteresis
5.8 6
185
6.2 V
mV
V
OVUSB
USBIN Overvoltage Lockout Voltage From Low to High
Hysteresis
5.8 6
185
6.2 V
mV
V
ASD-DC
V
DCIN
– V
BAT
Lockout Threshold V
DCIN
from Low to High, V
BAT
= 4.2V
V
DCIN
from High to Low, V
BAT
= 4.2V
70
10
120
40
170
70
mV
mV
V
ASD-USB
V
USBIN
– V
BAT
Lockout Threshold V
USBIN
from Low to High
V
USBIN
from High to Low
70
10
120
40
170
70
mV
mV
V
ENABLE
ENABLE Input Threshold Voltage 0.6 0.9 1.2 V
R
ENABLE
ENABLE Pulldown Resistance
l
1 2 3.5 MΩ
V
BDET
BATDET Input Threshold Voltage From Low to High 1.25 1.75 2 V
I
BATDET
BATDET Pull-Up Current V
BATDET
= 0V 2 4 6 μA
V
BOC
BATDET Open Circuit Voltage 4 4.2 4.4 V
V
OL
Output Low Voltage
(CHRG, PWR)
I
SINK
= 5mA 0.12 0.35 V
ΔV
RECHRG
Recharge Battery Threshold Voltage V
FLOAT
– V
RECHRG
, 0°C < T
A
< 85°C 90 125 160 mV
t
RECHRG
Recharge Comparator Filter Time V
BAT
from High to Low 2.25 4.1 6.75 ms
t
TERMINATE
Termination Comparator Filter Time I
BAT
Drops Below Termination Threshold 1 1.6 2.4 ms
R
ON-DC
Power FET “ON” Resistance
(Between DCIN and BAT)
600 mΩ
R
ON-USB
Power FET “ON” Resistance
(Between USBIN and BAT)
700 mΩ
T
LIM
Junction Temperature in Constant-
Temperature Mode
120 °C
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC4078EDD#TRPBF

Mfr. #:
Buy LTC4078EDD#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management Dual Input HV Li-Ion Charger w/ BAT Detect (No Trickle)
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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