Linear Technology LTC3810-5, Техническое описание

Страница: 4 / 38

LTC3810-5
4
38105fd
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 LTC3810-5 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC3810E-5 is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3810I-5 is guaranteed
to meet performance specifications over the full –40°C to 125°C operating
junction temperature range. The LTC3810H-5 is guaranteed to meet
performance specifications over the full –40°C to 150°C operating junction
temperature range. High junction temperatures degrade operating lifetimes;
operating lifetime is derated for junction temperatures greater than 125°C.
Note 3: T
J
is calculated from the ambient temperature T
A
and power
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
PGOOD Output
D
V
FBOV
PGOOD Upper Threshold
PGOOD Lower Threshold
V
FB
Rising
V
FB
Falling
7.5
–7.5
10
–10
12.5
–12.5
%
%
D
V
FB,HYST
PGOOD Hysterisis V
FB
Returning 1.5 3 %
V
PGOOD
PGOOD Low Voltage I
PGOOD
= 5mA 0.3 0.6 V
I
PGOOD
PGOOD Leakage Current V
PGOOD
= 5V 0 2 µA
PG Delay PGOOD Delay V
FB
Falling 120 µs
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
Hysterisis
l
4.45
0.1
4.7
0.25 0.4
V
V
V
INTVCC,1
INTV
CC
Voltage from EXTV
CC
6V < V
EXTVCC
< 15V 5.2 5.5 5.8 V
D V
EXTVCC,1
V
EXTVCC
- V
INTVCC
at Dropout I
CC
= 20mA, V
EXTVCC
= 5V 75 150 mV
D
V
LOADREG,1
INTV
CC
Load Regulation from EXTV
CC
I
CC
= 0mA to 20mA, V
EXTVCC
= 10V 0.01 %
V
INTVCC,2
INTV
CC
Voltage from NDRV Regulator Linear Regulator in Operation 5.2 5.5 5.8 V
D
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 specifications which apply over the full operating
temperature range, otherwise specifications 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
= 5V, V
MODE/SYNC
= V
SENSE
+
= V
SENSE
–
= V
BGRTN
= V
SW
= 0V, unless otherwise specified.
dissipation P
D
according to the following formula:
LTC3810-5: T
J
= T
A
+ (P
D
• 34°C/W)
Note 4: The LTC3810-5 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 150°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 8: I
CC
is the sum of current into NDRV and INTV
CC
.
Similar Parts Comparison
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
elecTrical characTerisTics