ltc4078 Linear Technology Corporation, ltc4078 Datasheet - Page 3

• Manufacturer Part Number: ltc4078
• Description: Dual Input Li-ion Battery Charger With Overvoltage Protection
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
SYMBOL
V
V
I
I
V
V
V
V
V
V
V
V
R
V
I
V
V
ΔV
t
t
R
R
T
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.
TERMINATE
TRIKL
BATDET
RECHRG
TERMINATE
TRIKL
ASD-DC
ASD-USB
LIM
IDC
IUSB
UVDC
UVUSB
OVDC
OVUSB
ENABLE
BDET
BOC
OL
ENABLE
ON-DC
ON-USB
RECHRG
PARAMETER
IDC Pin Regulated Voltage
IUSB Pin Regulated Voltage
Charge Current Termination Threshold
Trickle Charge Current (Note 6)
Trickle Charge Threshold (Note 6)
DCIN Undervoltage Lockout Voltage
USBIN Undervoltage Lockout Voltage
DCIN Overvoltage Lockout Voltage
USBIN Overvoltage Lockout Voltage
V
V
ENABLE Input Threshold Voltage
ENABLE Pulldown Resistance
BATDET Input Threshold Voltage
BATDET Pull-Up Current
BATDET Open Circuit Voltage
Output Low Voltage
(CHRG, PWR)
Recharge Battery Threshold Voltage
Recharge Comparator Filter Time
Termination Comparator Filter Time
Power FET “ON” Resistance
(Between DCIN and BAT)
Power FET “ON” Resistance
(Between USBIN and BAT)
Junction Temperature in Constant-
Temperature Mode
DCIN
USBIN
– V
– V
BAT
BAT
Lockout Threshold
Lockout Threshold
CONDITIONS
Constant-Current Mode
Constant-Current Mode
R
R
R
R
V
V
V
Hysteresis
From Low to High
Hysteresis
From Low to High
Hysteresis
From Low to High
Hysteresis
From Low to High
Hysteresis
V
V
V
V
From Low to High
V
I
V
V
I
SINK
BAT
BAT
BAT
BAT
DCIN
DCIN
USBIN
USBIN
BATDET
FLOAT
BAT
A
ITERM
ITERM
ITERM
ITERM
= 25°C. V
Drops Below Termination Threshold
< V
< V
Rising
from High to Low
= 5mA
from Low to High, V
from High to Low, V
– V
from Low to High
from High to Low
= 1k
= 2k
= 10k
= 20k
TRIKL
TRIKL
= 0V
The
RECHRG
; R
; R
l
DCIN
denotes the specifi cations which apply over the full operating
IDC
IUSB
, 0°C < T
= 5V, V
= 1.25k
= 2.1k
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.
BAT
A
BAT
USBIN
< 85°C
= 4.2V
= 4.2V
= 5V unless otherwise noted.
LTC4078/LTC4078X
l
l
l
l
l
MIN
1.25
2.25
3.5
2.8
3.8
5.8
5.8
0.6
90
42
60
30
70
10
70
10
90
8
4
1
2
4
1
47.5
4.15
3.95
1.75
0.12
TYP
100
100
190
170
185
185
120
120
125
600
700
120
2.9
0.9
4.2
4.1
1.6
50
10
80
40
40
1
1
5
6
6
2
4
MAX
0.35
6.75
110
100
170
170
160
6.5
4.3
4.1
6.2
6.2
1.2
3.5
4.4
2.4
58
12
65
70
70
3
2
6
UNITS
4078xfb
3
MΩ
mΩ
mΩ
mA
mA
mA
mA
mA
mA
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
ms
ms
μA
°C
V
V
V
V
V
V
V
V
V
V
V