Datasheet

LTC4088
4
4088fb
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
BUS
= 5V, BAT = 3.8V, R
CLPROG
= 2.94k, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
R
ON_CHG
Battery Charger Power FET
On-Resistance (Between V
OUT
and BAT)
I
BAT
= 200mA 0.18 Ω
T
LIM
Junction Temperature in Constant
Temperature Mode
110 °C
NTC
V
COLD
Cold Temperature Fault Threshold
Voltage
Rising Threshold
Hysteresis
75.0 76.5
1.5
78.0 %V
BUS
%V
BUS
V
HOT
Hot Temperature Fault Threshold
Voltage
Falling Threshold
Hysteresis
33.4 34.9
1.5
36.4 %V
BUS
%V
BUS
V
DIS
NTC Disable Threshold Voltage Falling Threshold
Hysteresis
0.7 1.7
50
2.7 %V
BUS
mV
I
NTC
NTC Leakage Current V
NTC
= V
BUS
= 5V –50 50 nA
Ideal Diode
V
FWD
Forward Voltage Detection I
OUT
= 10mA
V
BUS
= 0V, I
OUT
= 10mA
15
2
mV
mV
R
DROPOUT
Internal Diode On Resistance, Dropout I
OUT
= 200mA 0.18 Ω
I
MAX
Diode Current Limit 2 A
Always On 3.3V Supply
V
LDO3V3
Regulated Output Voltage 0mA < I
LDO3V3
< 25mA 3.1 3.3 3.4 V
R
OL3V3
Open-Loop Output Resistance 25 Ω
R
CL3V3
Closed-Loop Output Resistance 3.6 Ω
Logic (D0, D1, D2)
V
IL
Input Low Voltage 0.4 V
V
IH
Input High Voltage 1.2 V
I
PD
Static Pull-Down Current V
PIN
= 1V 2 µA
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 LTC4088E 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 3:
The LTC4088E includes overtemperature protection that is
intended to protect the device during momentary overload conditions.
Junction temperature will exceed 125°C when overtemperature protection
is active. Continuous operation above the specified maximum operating
junction temperature may impair device reliability.
Note 4: Total input current is the sum of quiescent current, I
BUSQ
, and
measured current given by V
CLPROG
/R
CLPROG
• (h
CLPROG
+ 1)