LTC3827 Datasheet, PDF (4/36 Pages) Linear Technology – Low IQ, Dual, 2-Phase Synchronous Step-Down Controller

LTC3827
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 12V, V_{RUN/SS1, 2} = 5V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
f_SYNCMAX Maximum Synchronizable Frequency
I_PLLLPF
Phase Detector Output Current
Sinking Capability
Sourcing Capability
PGOOD Output
PLLIN/MODE = External Clock; V_PLLLPF = 2V
f_PLLIN/MODE < f_OSC
f_PLLIN/MODE > f_OSC
650 800
kHz
–5
μA
5
μA
V_PGL
I_PGOOD
V_PG
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level
I_PGOOD = 2mA
V_PGOOD = 5V
V_FB with Respect to Set Regulated Voltage
V_FB Ramping Negative
V_FB Ramping Positive
0.1 0.3
V
±1
μA
–12 –10 –8
%
8
10 12
%
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 LTC3827E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3827I is guaranteed to meet
performance specifications over the full –40°C to 85°C operating
temperature range.
Note 3: T_J is calculated from the ambient temperature T_A and power
dissipation P_D according to the following formulas:
T_J = T_A + (P_D • 34 °C/W)
Note 4: The LTC3827 is tested in a feedback loop that servos V_{ITH1, 2} to a
specified voltage and measures the resultant V_{FB1, 2.}
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
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_MAX (see minimum on-time
considerations in the Applications Information section).
3827ff
4