ltc4001 Linear Technology Corporation, ltc4001 Datasheet - Page 3

• Manufacturer Part Number: ltc4001
• Description: 2a Synchronous Buck Li-ion Charger
• Manufacturer: Linear Technology Corporation

The
V
SYMBOL PARAMETER
t
V
∆V
V
V
I
I
V
V
V
V
t
t
t
I
V
V
V
∆V
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: Operation with current limited wall adapters is allowed down to the
undervoltage lockout threshold.
Note 3: The LTC4001E is guaranteed to meet 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.
ELECTRICAL CHARACTERISTICS
TIMER
IDET
CHRG
RB
RECHRG
TRIKL
SS
EN
PROG
IDET
CHRG
OL
OH
RECHRG
COLD
HOT
DIS
IN
EN
DIS
= 5V, V
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are T
Timer Accuracy
Enable Input Threshold Voltage
Enable Input Hysteresis
PROG Pin Voltage
IDET Pin Voltage
IDET Threshold
CHRG Pin Weak Pull-Down Current
CHRG Pin Output Low Voltage
FAULT Pin Output Low Voltage
FAULT Pin Output High Voltage
Recharge Battery Threshold Voltage
Recharge Filter Time Constant
Recharge Time
Low-Battery Trickle Charge Time
Soft-Start Ramp Current
NTC Pin Cold Temperature Fault
Threshold
NTC Pin Hot Temperature Fault
Threshold
NTC Disable Threshold (Falling)
NTC Disable Hysteresis
EN
= 0V, R
PROG
= 549Ω, R
IDET
= 549Ω, unless otherwise specified.
CONDITIONS
C
V
R
R
R
V
I
1mA Load
1mA Load
V
Percent of Total Charge Time
Percent of Total Charge Time, V
Measured Using BATSENS and GNDSENS Pins
V
and GNDSENS Pins
From NTC to GNDSENS Pin
From NTC to GNDSENS Pin
From NTC to GNDSENS Pin
From NTC to GNDSENS Pin
CHRG
TIMER
EN
PROG
IDET
IDET
CHRG
FLOAT
BAT
Rising Threshold
Falling Threshold
Falling Threshold
Rising Threshold
Rising
< V
= 549Ω
= 549Ω
= 5mA
= 549Ω
= 1V
– V
= 0.22µF
FLOAT
RECHRG
– 100mV, V
V
BAT
Falling
BAT
Note 4: T
dissipation P
Note 5: This IC includes overtemperature protection that is intended to
protect the device during momentary overload. Junction temperature will
exceed 125°C when overtemperature protection is active. Continuous
operation above the specified maximum operating junction temperature
my impair device reliability.
T
Across BATSENS
J
BAT
= T
< 2.8V,
J
A
is calculated from the ambient temperature T
+ (P
D
according to the following formula:
D
• 37°C/W)
V
0.015 •
INSENSE
MIN
150
0.6
4.6
15
50
4
6
0.01 • V
0.74 V
0.72 V
0.29 V
0.30 V
V
1.213
1.213
0.02 •
INSENSE
12.8
TYP
±10
100
200
100
0.8
0.2
30
50
25
INSENSE
INSENSE
INSENSE
INSENSE
INSENSE
A
= 25°C.
LTC4001
V
0.025 •
A
INSENSE
MAX
250
135
0.4
0.4
50
16
and power
1
UNITS
3
4001f
mV
mA
mV
ms
µA
µA
%
%
%
V
V
V
V
V
V
V
V
V
V
V
V