Datasheet

3
LTC1759
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
BOOST Pin Current V
BOOST
= V
SW
+ 8V, 0V ≤ V
SW
≤ 20V
TGATE High 2 3 mA
TGATE Low 2 3 mA
V
BOOST
Threshold to Turn T
GATE
Off Measured at (V
BOOST
– V
SW
)
(Note 6) Low to High
● 6.8 7.3 7.6 V
Hysteresis 0.25 V
BOOSTC Pin Current V
BOOSTC
= V
CC
+ 8V 1 mA
Sense Amplifier CA1 Gain and Input Offset Voltage 11V ≤ V
CC
≤ 24V, 0V ≤ V
BAT
≤ 20V
(With R
S2
= R
S3
= 200Ω)R
SET
= 4.93k ● 92 100 108 mV
(Measured Across R
S1
) (Note 4) R
SET
= 49.3k 7 10 13 mV
CA1 Bias Current (SENSE, BAT1) V
SDB
= High ● –50 –120 µA
V
SDB
= Low (Shutdown) –10 µA
CA1 Input Common Mode Range ● –0.25 V
CC
– 0.3 V
SPIN Input Current V
SDB
= High, V
SPIN
= 12.6V ● 2mA
V
SDB
= Low 10 µA
CL1 Turn-On Threshold 0.5mA Output Current 87 92 97 mV
CL1 Transconductance Output Current from 50µA to 500µA 0.5 1 3 mho
CLP Input Current 0.5mA Output Current 1 3 µA
CLN Input Current 0.5mA Output Current 0.8 2 mA
CA2 Transconductance V
C
= 1V, I
VC
= ±1µA 150 200 300 µmho
V
A
Transconductance (Note 5) Ouput Current from 50µA to 500µA 0.21 0.6 1 mho
Gate Drivers
V
GBIAS
V
CC
≥ 11V, I
GBIAS
≤ 15mA, V
SDB
= High ● 8.4 9.1 9.6 V
V
TGATE
High (V
TGAGE
– V
SW
)I
TGATE
≤ 20mA ● 5.6 6.6 V
V
BGATE
High I
BGATE
≤ 20mA ● 6.2 7.2 V
V
TGATE
Low (V
TGATE
– V
SW
)I
TGATE
≤ 50mA ● 0.8 V
V
BGATE
Low I
BGATE
≤ 50mA ● 0.8 V
INFET “ON” Clamping Voltage (V
CC
– V
INFET
) ● 6.5 7.8 9 V
INFET “ON” Drive Current V
INFET
= V
CC
– 6V ● 820 mA
INFET “OFF” Clamping Voltage V
CC
Not Connected, I
INFET
< –2µA 1.4 V
INFET “OFF” Drive Current V
CC
= 12.4V, (V
CC
– V
INFET
) ≥ 2V –2.5 mA
V
TGATE
, V
BGATE
at Shutdown V
SDB
= Low, I
TGATE
= I
BGATE
= 10µA ● 1V
Trip Points
DCDIV Threshold V
DCDIV
Rising from 0.8V to 1.2V ● 0.9 1.0 1.1 V
DCDIV Hysteresis 25 mV
DCDIV Input Bias Current V
DCDIV
= 1V ● 100 nA
Power-Fail Indicator (V
BAT2
≥ V
DCIN
) (Note 7) AC_PRESENT = 1, V
DCIN
= 6V ● 0.84 0.89 0.97 V/V
Power-Fail Indicator Hysteresis (V
BAT2
≥ V
DCIN
) AC_PRESENT = 1, V
DCIN
= 6V 0.02 V/V
SYNC Pin Threshold 0.9 1.4 2.0 V
SYNC Pin Input Current V
SYNC
= 0V –500 µA
V
SYNC
= 2V –30 µA
The ● denotes specifications which apply over the full operating temperature range (T
J
= 0°C to 100°C), otherwise specifications are
T
A
= 25°C. V
CC
= DCIN = 18V, V
BAT1, 2
= 12.6V, V
DD
= 3.3V unless otherwise specified.