LTC4001 Datasheet, PDF (3/20 Pages) Linear Technology – 2A Synchronous Buck Li-Ion Charger

LTC4001
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T_A = 25°C.
V_IN = 5V, V_EN = 0V, R_PROG = 549Ω, R_IDET = 549Ω, unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
t_TIMER
V_EN
∆V_EN
V_PROG
V_IDET
I_IDET
I_CHRG
V_CHRG
V_OL
V_OH
V_RECHRG
t_RB
t_RECHRG
t_TRIKL
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
C_TIMER = 0.22µF
V_EN Rising
R_PROG = 549Ω
R_IDET = 549Ω
R_IDET = 549Ω
V_CHRG = 1V
I_CHRG = 5mA
1mA Load
1mA Load
V_FLOAT – V_RECHRG V_BAT Falling
Percent of Total Charge Time
Percent of Total Charge Time, V_BAT < 2.8V,
Measured Using BATSENS and GNDSENS Pins
±10
0.6
0.8
1
100
1.213
1.213
150 200 250
15
30
50
0.2
0.4
0.4
4.6
50
100 135
4
50
25
I_SS
Soft-Start Ramp Current
V_BAT < V_FLOAT – 100mV, V_BAT Across BATSENS
and GNDSENS Pins
6
12.8
16
V_COLD
NTC Pin Cold Temperature Fault
Threshold
V_HOT
NTC Pin Hot Temperature Fault
Threshold
V_DIS
∆V_DIS
NTC Disable Threshold (Falling)
NTC Disable Hysteresis
From NTC to GNDSENS Pin
Rising Threshold
Falling Threshold
From NTC to GNDSENS Pin
Falling Threshold
Rising Threshold
From NTC to GNDSENS Pin
From NTC to GNDSENS Pin
0.74 V_INSENSE
0.72 V_INSENSE
0.29 V_INSENSE
0.30 V_INSENSE
0.015 • 0.02 • 0.025 •
V_INSENSE V_INSENSE V_INSENSE
0.01 • V_INSENSE
UNITS
%
V
mV
V
V
mA
µA
V
V
V
mV
ms
%
%
µA
V
V
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.
Note 4: T_J is calculated from the ambient temperature T_A and power
dissipation P_D according to the following formula:
T_J = T_A + (P_D • 37°C/W)
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.
4001f
3