Datasheet
LTC4099
4
4099fd
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
PROG,TRKL
PROG Pin Servo Voltage in Trickle Charge BAT < V
TRKL
0.100 V
h
PROG
Ratio of I
BAT
to PROG Pin Current 1030 mA/mA
V
TRKL
Trickle Charge Threshold Voltage BAT Rising 2.7 2.85 3 V
ΔV
TRKL
Trickle Charge Hysteresis Voltage 130 mV
V
RECHRG
Recharge Battery Threshold Voltage Threshold Voltage Relative to V
FLOAT
–75 –100 –125 mV
t
TERM_RANGE
Safety Timer Termination Period Range Selectable by I
2
C, Timer Starts When
BAT = V
FLOAT
1-8 Hour
t
BADBAT
Bad Battery Termination Time BAT < V
TRKL
0.4 0.5 0.6 Hour
V
C/x
Full Capacity Charge Indication PROG
Voltage (Note 5)
COVERX1/0 = 00 90 100 110 mV
COVERX1/0 = 01 40 50 60 mV
COVERX1/0
= 10 190 200 210 mV
COVERX1/0
= 11 490 500 510 mV
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
Selectable by I
2
C 85, 105 °C
Bat-Track External Switching Regulator Control
V
WALL
Absolute WALL Input Threshold Rising Threshold
Falling Threshold
4.15 4.3
3.2
4.45 V
V
ΔV
WALL
Differential WALL Input Threshold WALL–BAT Rising Threshold
WALL–BAT Falling Threshold
0
90
37
50
mV
mV
V
OUT
Regulation Target Under V
C
Control 3.5 BAT + 0.3 V
I
WALLQ
WALL Quiescent Current 130 µA
R
ACPR
ACPR Pull-Down Strength 150 Ω
VH
ACPR
ACPR High Voltage I
ACPR
= 0mA V
OUT
V
VL
ACPR
ACPR Low Voltage I
ACPR
= 0mA 0 V
Overvoltage Protection
V
OVCUTOFF
Overvoltage Protection Threshold Rising Threshold, R
OVSENS
= 6.2k 6.10 6.35 6.70 V
V
OVGATE
OVGATE Output Voltage Input Below V
OVCUTOFF
Input Above V
OVCUTOFF
1.88 • V
OVSENS
0
12 V
V
V
OVGATELOAD
OVGATE Voltage with 1µA Load 5V Through 6.2k into OVSENS 8 8.6 V
I
OVSENSQ
OVSENS Quiescent Current V
OVSENS
= 5V 40 µA
t
RISE
OVGATE Time to Reach Regulation C
OVGATE
= 1nF 2.5 ms
Overtemperature Battery Conditioner
I
DISCHARGE
Overtemperature Battery Discharge
Current
Only
When Enabled via I
2
C Control,
BAT = 4.2V
180 mA
V
ALLOW
Maximum Allowed Overtemperature
Battery Voltage
Only When Enabled via I
2
C Control 3.85 V
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating temp-
erature range, otherwise specifications are at T
A
= 25°C. V
BUS
= 5V, BAT = 3.8V, DV
CC
= 3.3V, R
PROG
= 1.02k, R
CLPROG
= 3.01k, unless
otherwise noted.