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LTC4001EUF-1-TRPBF Datasheet(PDF) 3 Page - Linear Technology

Part # LTC4001EUF-1-TRPBF
Description  2A Synchronous Buck Li-Ion Charger
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4001EUF-1-TRPBF Datasheet(HTML) 3 Page - Linear Technology

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LTC4001-1
3
40011fa
ELECTRICAL CHARACTERISTICS
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.
The
l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, VEN = 0V, RPROG = 549Ω, RIDET = 549Ω, unless otherwise
specified.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
fOSC
Oscillator Frequency
1.3
1.5
1.7
MHz
D
Maximum Duty Factor
100
%
RPFET
RDS(ON) of P-Channel MOSFET
Measured from PVIN to SW
127
RNFET
RDS(ON) of N-Channel MOSFET
Measured from SW to PGND
121
tTIMER
Timer Accuracy
CTIMER = 0.22μF
±10
%
VEN
Enable Input Threshold Voltage
VEN Rising
0.6
0.8
1
V
ΔVEN
Enable Input Hysteresis
100
mV
VPROG
PROG Pin Voltage
RPROG = 549Ω
1.213
V
VIDET
IDET Pin Voltage
RIDET = 549Ω
1.213
V
IIDET
IDET Threshold
RIDET = 549Ω
150
200
250
mA
ICHRG
CHRG Pin Weak Pull-Down
Current
VCHRG = 1V
15
30
50
μA
VCHRG
CHRG Pin Output Low Voltage
ICHRG = 5mA
0.2
0.4
V
VOL
FAULT Pin Output Low Voltage
1mA Load
0.4
V
VOH
FAULT Pin Output High Voltage
1mA Load
4.6
V
VRECHRG Recharge Battery Threshold
Voltage
VFLOAT – VRECHRG VBAT Falling
50
100
135
mV
tRB
Recharge Filter Time Constant
4
ms
tRECHRG
Recharge Time
Percent of Total Charge Time
50
%
tTRIKL
Low-Battery Trickle Charge Time
Percent of Total Charge Time, VBAT < 2.8V,
Measured Using BATSENS and GNDSENS Pins
25
%
ISS
Soft-Start Ramp Current
VBAT < VFLOAT – 100mV, VBAT Across BATSENS
and GNDSENS Pins
6
12.8
16
μA
VCOLD
NTC Pin Cold Temperature Fault
Threshold
From NTC to GNDSENS Pin
Rising Threshold
Falling Threshold
0.74 VINSENSE
0.72 VINSENSE
V
V
VHOT
NTC Pin Hot Temperature Fault
Threshold
From NTC to GNDSENS Pin
Falling Threshold
Rising Threshold
0.29 VINSENSE
0.30 VINSENSE
V
V
VDIS
NTC Disable Threshold (Falling)
From NTC to GNDSENS Pin
0.015 •
VINSENSE
0.02 •
VINSENSE
0.025 •
VINSENSE
V
ΔVDIS
NTC Disable Hysteresis
From NTC to GNDSENS Pin
0.01 •
VINSENSE
V
Note 4: TJ is calculated from the ambient temperature TA and power dis-
sipation PD according to the following formula:
TJ = TA + (PD • 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.


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