LTC4001-1_15 Datasheet, PDF (3/20 Pages) Linear Technology – 2A Synchronous Buck Li-Ion Charger

LTC4001-1
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 5V, V_EN = 0V, R_PROG = 549Ω, R_IDET = 549Ω, unless otherwise
specified.
SYMBOL PARAMETER
f_OSC
Oscillator Frequency
D
Maximum Duty Factor
R_PFET
R_NFET
t_TIMER
V_EN
R_DS(ON) of P-Channel MOSFET
R_DS(ON) of N-Channel MOSFET
Timer Accuracy
Enable Input Threshold Voltage
ΔV_EN
V_PROG
V_IDET
I_IDET
I_CHRG
V_CHRG
Enable Input Hysteresis
PROG Pin Voltage
IDET Pin Voltage
IDET Threshold
CHRG Pin Weak Pull-Down
Current
CHRG Pin Output Low Voltage
V_OL
V_OH
V_RECHRG
FAULT Pin Output Low Voltage
FAULT Pin Output High Voltage
Recharge Battery Threshold
Voltage
t_RB
t_RECHRG
t_TRIKL
Recharge Filter Time Constant
Recharge Time
Low-Battery Trickle Charge Time
I_SS
Soft-Start Ramp Current
V_COLD NTC Pin Cold Temperature Fault
Threshold
V_HOT NTC Pin Hot Temperature Fault
Threshold
V_DIS
NTC Disable Threshold (Falling)
CONDITIONS
Measured from PV_IN to SW
Measured from SW to PGND
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
V_BAT < V_FLOAT – 100mV, V_BAT Across BATSENS
and GNDSENS Pins
From NTC to GNDSENS Pin
Rising Threshold
Falling Threshold
From NTC to GNDSENS Pin
Falling Threshold
Rising Threshold
From NTC to GNDSENS Pin
ΔV_DIS NTC Disable Hysteresis
From NTC to GNDSENS Pin
MIN
TYP
MAX UNITS
1.3
1.5
1.7
MHz
100
%
127
mΩ
121
mΩ
±10
%
0.6
0.8
1
V
100
mV
1.213
V
1.213
V
150
200
250
mA
15
30
50
μA
0.2
0.4
V
0.4
V
4.6
V
50
100
135
mV
4
ms
50
%
25
%
6
12.8
16
μA
0.74 V_INSENSE
V
0.72 V_INSENSE
V
0.29 V_INSENSE
V
0.30 V_INSENSE
V
0.015 •
0.02 •
0.025 •
V
V_INSENSE V_INSENSE V_INSENSE
0.01 •
V
V_INSENSE
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-1 is guaranteed to meet performance specifica-
tions 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 dis-
sipation 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.
40011fa
3