LTC3731_15 Datasheet, PDF (5/34 Pages) Linear Technology – 3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller

LTC3731
ELECTRICAL CHARACTERISTICS The l 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 PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
Differential Amplifier
A_V
V_OS
CMRR
I_CL
GBP
SR
V_O(MAX)
R_IN
Differential Gain
Input Offset Voltage Magnitude
Common Mode Rejection Ratio
Output Current Sourcing
Gain-Bandwidth Product
Slew Rate
Maximum High Output Voltage
Input Resistance
0.995 1.000 1.005
V/V
IN⁺ = IN^– = 1.2V, I_OUT = 1mA, Input Referred; Gain = 1
0.5
5
mV
0V < IN⁺ = IN^– < 5V, I_OUT = 1mA, Input Referred
50
70
dB
10
40
mA
I_OUT = 1mA
R_L = 2k
I_OUT = 1mA
Measured at IN⁺ Pin
2
MHz
5
V/µs
V_CC – 1.2 V_CC – 0.8
V
80
kΩ
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: T_J is calculated from the ambient temperature T_A and power
dissipation P_D according to the following formula:
LTC3731CG/LTC3731IG: T_J = T_A + (P_D • 95°C/W)
LTC3731CG/LTC3731IG: T_J = T_CASE + (P_D • 32°C/W)
LTC3731CUH/LTC3731IUH: T_J = T_A + (P_D • 34°C/W)
Note 3: The IC is tested in a feedback loop that includes the differential
amplifier loaded with 100µA to ground driving the error amplifier and
servoing the resultant voltage to the midrange point for the error amplifier
(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. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
3731fc
5