Datasheet

LTC3810
4
3810fc
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 LTC3810 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC3810E is guaranteed to meet performance specifi cations
from 0°C to 85°C. Specifi cations over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3810I is guaranteed
to meet perfomance specifi cations over the full –40°C to 125°C operating
junction temperature range.
Note 3: T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formula:
LTC3810: T
J
= T
A
+ (P
D
• 100°C/W)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Tracking
I
SS/TRACK
SS/TRACK Source Current V
SS/TRACK
> 0.5V 0.7 1.4 2.5 μA
V
FB,TRACK
Feedback Voltage at Tracking V
TRACK
= 0V, I
TH
= 1.2V (Note 4)
V
TRACK
= 0.5V, I
TH
= 1.2V (Note 4) 0.48
–0.018
0.5 0.52
V
V
V
CC
Regulators
V
EXTVCC
EXTV
CC
Switchover Voltage
EXTV
CC
Rising
EXTV
CC
Hysteresis
l
6.4
0.1
6.7
0.3 0.5
V
V
V
INTVCC,1
INTV
CC
Voltage from EXTV
CC
10.5V < V
EXTVCC
< 15V 9.4 10 10.6 V
∆V
EXTVCC,1
V
EXTVCC
– V
INTVCC
at Dropout I
CC
= 20mA, V
EXTVCC
= 9.1V 170 250 mV
∆V
LOADREG,1
INTV
CC
Load Regulation from EXTV
CC
I
CC
= 0mA to 20mA, V
EXTVCC
= 12V 0.01 %
V
INTVCC,2
INTV
CC
Voltage from NDRV Regulator Linear Regulator in Operation 9.4 10 10.6 V
∆V
LOADREG,2
INTV
CC
Load Regulation from NDRV I
CC
= 0mA to 20mA, V
EXTVCC
= 0 0.01 %
I
NDRV
Current into NDRV Pin V
NDRV
– V
INTVCC
= 3V 20 40 60 μA
I
NDRVTO
Linear Regulator Timeout Enable
Threshold
210 270 350 μA
V
CCSR
Maximum Supply Voltage Trickle Charger Shunt Regulator 15 V
I
CCSR
Maximum Current into NDRV/INTV
CC
Trickle Charger Shunt Regulator,
INTV
CC
≤ 16.7V (Note 8)
10 mA
The l denotes specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C (Note 2), INTV
CC
= DRV
CC
= V
BOOST
= V
ON
= V
RNG
= SHDN = UV
IN
=
V
EXTVCC
= V
NDRV
= 10V, V
MODE/SYNC
= V
SENSE
+
= V
SENSE
–
= V
BGRTN
= V
SW
= 0V, unless otherwise specifi ed.
Note 4: The LTC3810 is tested in a feedback loop that servos V
FB
to the
reference voltage with the I
TH
pin forced to a voltage between 1V and 2V.
Note 5: The dynamic input supply current is higher due to the power
MOSFET gate charging being delivered at the switching frequency
(Q
G
• f
OSC
).
Note 6: Guaranteed by design. Not subject to test.
Note 7: This IC 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 specifi ed maximum operating junction
temperature may impair device reliability.
Note 8: I
CC
is the sum of current into NDRV and INTV
CC
.
ELECTRICAL CHARACTERISTICS
PARAMETER LTC3810 LTC3810-5 LTC3812-5
Maximum V
IN
100V 60V 60V
MOSFET Gate Drive 6.35V to 14V 4.5V to 14V 4.5V to 14V
INTV
CC
UV
+
6.2V 4.2V 4.2V
INTV
CC
UV
–
6V 4V 4V
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