LTC3731H Datasheet, PDF (4/32 Pages) Linear Technology – 3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller

LTC3731H
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_CC = V_RUN/SS = 5V unless otherwise noted.
SYMBOL
V_PLLTH
R_PLLIN
I_PLLFLTR
R_RELPHS
CLKOUT
PARAMETER
PLLIN Input Threshold
PLLIN Input Resistance
Phase Detector Output Current
Sinking Capability
Sourcing Capability
Controller 2-Controller 1 Phase
Controller 3-Controller 1 Phase
Controller 1 TG to CLKOUT Phase
CONDITIONS
Minimum Pulse Width > 100ns
f_PLLIN < f_OSC
f_PLLIN > f_OSC
PHASMD = 0V
PHASMD = 5V
MIN TYP
1
50
20
20
120
240
30
60
MAX UNITS
V
kΩ
µA
µA
Deg
Deg
Deg
Deg
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3731H is guaranteed to meet specifications from –40°C to
140°C. Junction temperature (T_J) is calculated from the ambient
temperature T_A and power dissipation P_D according to the following
formula:
LTC3731H: T_J = T_A + (P_D × 95°C/W)
LTC3731H: T_J = T_CASE + (P_D × 32°C/W)
High junction temperatures degrade operating lifetimes. Operating lifetime
at junction temperatures greater than 125°C is derated to 1000 hours.
Note 3: The IC is tested in a feedback loop that servoes the error amplifier
output voltage to its midrange point (V_ITH = 1.2V).
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 5: The minimum on-time condition corresponds to an inductor peak-
to-peak ripple current of ≥ 40% of I_MAX (see minimum on-time
considerations in the Applications Information Section).
Note 6: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions.
Overtemperature protection becomes active at a junction temperature
greater than the maximum operating temperature. Continuous operation
above the specified maximum operating junction temperature may impair
device reliability.
3731hf
4