Datasheet

LTC4090/LTC4090-5
4
4090fc
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t
TIMER
TIMER Accuracy V
BAT
= 4.3V –10 10 %
Recharge Time Percent of Total Charge Time 50 %
Low Battery Trickle Charge Time Percent of Total Charge Time,
V
BAT
<2.9V
25 %
T
LIM
Junction Temperature in Constant-
Temperature Mode
105 °C
Internal Ideal Diode
R
FWD
Incremental Resistance, V
ON
Regulation I
OUT
= 100mA 125
mΩ
R
DIO, ON
On-Resistance V
BAT
to V
OUT
I
OUT
= 600mA 215
mΩ
V
FWD
Voltage Forward Drop (V
BAT
– V
OUT
)I
OUT
= 5mA
I
OUT
= 100mA
I
OUT
= 600mA
l
10 30
55
160
50 mV
mV
mV
V
OFF
Diode Disable Battery Voltage 2.7 V
I
FWD
Load Current Limit for V
ON
Regulation 550 mA
I
D(MAX)
Diode Current Limit 2.2 A
External Ideal Diode
V
FWD, EXT
External Diode Forward Voltage 20 mV
Logic (CHRG, HVPR, TIMER, SUSP, HPWR, HVEN, PG, SYNC)
V
CHG, SD
Charger Shutdown Threshold Voltage
on TIMER
l
0.14 0.4 V
I
CHG, SD
Charger Shutdown Pull-Up Current on
TIMER
V
TIMER
= 0V
l
514 μA
V
OL
Output Low Voltage (CHRG, HVPR); I
SINK
= 5mA
l
0.1 0.4 V
V
IH
Input High Voltage SUSP, HPWR 1.2 V
V
IL
Input Low Voltage SUSP, HPWR 0.4 V
V
HVEN, H
HVEN High Threshold 2.3 V
V
HVEN, L
HVEN Low Threshold 0.3 V
I
PULLDN
Logic Input Pull-Down Current SUSP, HPWR 2 μA
I
HVEN
HVEN Pin Bias Current HVEN = 2.5V 5 10 μA
V
PG
PG Threshold HVOUT Rising 2.8 V
ΔV
PG
PG Hysteresis 35 mV
I
PGLK
PG Leakage PG = 5V 0.1 1 μA
I
PG
PG Sink Current PG = 0.4V
l
100 900 μA
V
SYNC, L
SYNC Low Threshold 0.5 V
V
SYNC, H
SYNC High Threshold 0.8 V
I
SYNC
SYNC Pin Bias Current V
SYNC
= 0V 0.1 μA
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. HVIN = HVEN = 12V, BOOST = 17V, V
IN
= HPWR = 5V, V
BAT
= 3.7V,
R
PROG
= 100k, R
CLPROG
= 2k and SUSP = 0V, unless otherwise noted.