LTC3374
5
3374fc
For more information www.linear.com/LTC3374
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
CC
= V
IN1-8
= 3.3V, unless otherwise specified.
ELECTRICAL CHARACTERISTICS
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 LTC3374
is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC3374E is guaranteed to meet specifications from
0°C to 85°C junction temperature. Specifications over the –40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3374I is guaranteed over the –40°C to 125°C operating junction
temperature range and the LTC3374H is guaranteed
over the –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 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. The junction
temperature (T
J
in °C) is calculated from ambient temperature (T
A
in °C)
and power dissipation (P
D
in Watts) according to the formula:
T
J
= T
A
+ (P
D
• θ
JA
)
where θ
JA
(in °C/W) is the package thermal impedance.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Interface Logic Pins (PGOOD_ALL, MODE)
I
OH
Output High Leakage Current PGOOD_ALL 5.5V at Pin –1 1 µA
V
OL
Output Low Voltage PGOOD_ALL 3mA into Pin 0.1 0.4 V
V
IH
Input High Threshold MODE
l
1.2 V
V
IL
Input Low Threshold MODE
l
0.4 V
Interface Logic Pins (EN1, EN2, EN3, EN4, EN5, EN6, EN7, EN8)
V
HI_ALLOFF
Enable Rising Threshold All Regulators Disabled
l
400 730 1200 mV
V
EN_HYS
Enable Falling Hysteresis 60 mV
V
HI
Enable Rising Threshold At Least One Regulator Enabled
l
380 400 420 mV
I
EN
Enable Pin Leakage Current EN = V
CC
= V
IN
= 5.5V –1 1 µA
Note 3: The LTC3374 includes overtemperature protection which protects
the device during momentary overload conditions. Junction temperatures
will exceed 150°C when overtemperature protection is active. Continuous
operation above the specified maximum operating junction temperature
may impair device reliability.
Note 4: Static current, switches not switching. Actual
current may be
higher due to gate charge losses at the switching frequency.
Note 5: The current limit features of this part are intended to protect the
IC from short term or intermittent fault conditions. Continuous operation
above the maximum specified pin current rating may result in device
degradation over time.
Note 6: The soft-start is the time from the first top switch turn on, after an
enable rising, until the feedback has reached 90% of its nominal regulation
voltage.
