LTC3895
elecTrical characTerisTics The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2), VIN = 12V, VRUN = 5V, VEXTVCC = 0V, VDRVSET = 0V,
VPRG = FLOAT unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
INTV LDO Regulator
CC
INTVCC
V
INTV Voltage
I
CC
= 0mA to 2mA
4.7
5.0
5.2
V
CC
Oscillator and Phase-Locked Loop
Programmable Frequency
Programmable Frequency
Programmable Frequency
Low Fixed Frequency
R
R
R
= 25k, PLLIN = DC Voltage
= 65k, PLLIN = DC Voltage
=105k, PLLIN = DC Voltage
= 0V, PLLIN = DC Voltage
105
440
835
350
535
kHz
kHz
kHz
kHz
kHz
kHz
FREQ
FREQ
FREQ
FREQ
FREQ
375
505
V
V
320
485
75
380
585
850
High Fixed Frequency
= INTV , PLLIN = DC Voltage
CC
l
f
Synchronizable Frequency
PLLIN = External Clock
SYNC
l
l
PLLIN Input High Level
PLLIN Input Low Level
PLLIN = External Clock
PLLIN = External Clock
2.8
V
V
0.5
PGOOD Output
V
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level
I
= 2mA
= 3.3V
0.02
0.04
10
V
PGL
PGOOD
I
V
V
µA
PGOOD
PGOOD
with Respect to Set Regulated Voltage
FB
V
Ramping Negative
–13
7
–10
2.5
–7
13
%
%
FB
Hysteresis
V
with Respect to Set Regulated Voltage
FB
V
Ramping Positive
10
2.5
%
%
FB
Hysteresis
Delay for Reporting a Fault
40
µs
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Ratings for extended periods may affect device reliability and
lifetime.
Note 4: The LTC3895 is tested in a feedback loop that servos V to a
ITH
specified voltage and measures the resultant V . The specification at 85°C
FB
is not tested in production and is assured by design, characterization and
correlation to production testing at other temperatures (125°C for the
LTC3895E and LTC3895I, 150°C for the LTC3895H). For the LTC3895I
and LTC3895H, the specification at 0°C is not tested in production and is
assured by design, characterization and correlation to production testing
at –40°C.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See the Applications information
section.
Note 2: The LTC3895 is tested under pulsed load conditions such that T ≈
J
T . The LTC3895E is guaranteed to meet performance specifications from
A
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 LTC3895I is guaranteed over the
–40°C to 125°C operating junction temperature range and the LTC3895H
is guaranteed over the –40°C to 150°C operating junction temperature
range. Note that the maximum ambient temperature consistent with
these specifications is determined by specific operating conditions in
conjunction with board layout, the rated package thermal impedance
and other environmental factors. High temperatures degrade operating
lifetimes; operating lifetime is derated for junction temperatures greater
Note 6: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 7: The minimum on-time condition is specified for an inductor
peak-to-peak ripple current >40% of I
(See Minimum On-Time
MAX
Considerations in the Applications Information section).
than 125ºC. The junction temperature (T , in °C) is calculated from the
J
Note 8: Do not apply a voltage or current source to these pins. They must
be connected to capacitive loads only, otherwise permanent damage may
occur.
ambient temperature (T , in °C) and power dissipation (P , in Watts)
A
D
according to the formula:
T = T + (P • θ )
JA
J
A
D
Note 9: Do not apply a voltage or current source to the NDRV pin, other
where θ = 28°C/W for the TSSOP package.
JA
than tying NDRV to DRV when not used. If used it must be connected
CC
Note 3: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. The maximum
rated junction temperature will be exceeded when this protection is active.
Continuous operation above the specified absolute maximum operating
junction temperature may impair device reliability or permanently damage
the device.
to capacitive loads only (see DRV Regulators in the Applications
Information section), otherwise permanent damage may occur.
Note 10: The minimum input supply operating range is dependent on the
CC
DRV UVLO thresholds as determined by the DRVUV pin setting.
CC
3895fa
5
For more information www.linear.com/LTC3895
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