LTC3879_15 Datasheet, PDF (4/28 Pages) Linear Technology – Fast, Wide Operating Range No RSENSE Step-Down Controller

LTC3879
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 = 15V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Internal V_CC Regulator
Internal V_CC Voltage
Internal V_CC Load Regulation
PGOOD Output
6V < V_IN < 38V
I_CC = 0mA to 20mA
5.15
5.3
5.45
V
–0.1
±2
%
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Hysteresis
PGOOD Low Voltage
PGOOD Turn-On Delay
V_FB Rising
V_FB Falling
V_FB Returning
I_PGOOD = 5mA
7.8
10
12.2
%
–7.8 –10 –12.2
%
2
3.8
%
0.15
0.4
V
12
μs
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, as follows:
T_J = T_A + (P_D • θ_JA)
Note 3: The LTC3879 is tested in a feedback loop that adjusts V_FB to
achieve a specified error amplifier output voltage (I_TH).
Note 4: The LTC3879E is guaranteed to meet 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 LTC3879I is guaranteed to meet
specifications over the full –40°C to 85°C operating temperature range.
Note 5: Rise and fall time are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
3879f
4