LTC3374 Datasheet, PDF (5/24 Pages) Linear Technology – 8-Channel Parallelable 1A Buck DC/DCs

LTC3374
ELECTRICAL CHARACTERISTICS 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.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Interface Logic Pins (PBGOOD_ALL, MODE)
I_OH
Output High Leakage Current
PGOOD_ALL 5.5V at Pin
V_OL
Output Low Voltage
PGOOD_ALL 3mA into Pin
V_IH
Input High Threshold
MODE
V_IL
Input Low Threshold
MODE
Interface Logic Pins (EN1, EN2, EN3, EN4, EN5, EN6, EN7, EN8)
–1
1
µA
0.1
0.4
V
l 1.2
V
l
0.4
V
V_{HI_ALLOFF}
V_{EN_HYS}
V_HI
I_EN
Enable Rising Threshold
Enable Falling Hysteresis
Enable Rising Threshold
Enable Pin Leakage Current
All Regulators Disabled
At Least One Regulator Enabled
EN = V_CC = V_IN = 5.5V
l 400
730
1200
mV
60
mV
l 380
400
420
mV
–1
1
µA
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.
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.
3374f
For more information www.linear.com/LTC3374
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