LTC3863_15 Datasheet, PDF (4/38 Pages) Linear Technology – 60V Low IQ Inverting DC/DC Controller

LTC3863
Electrical Characteristics The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T_A = 25°C. (Note 4) V_IN = 12V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Gate Driver
V_CAP
Gate Bias LDO Output Voltage (V_IN-V_CAP)
I_GATE = 0mA
l 7.6
8.0
8.5
V
V_CAPDROP Gate Bias LDO Dropout Voltage
∆V_CAP(LINE) Gate Bias LDO Line Regulation
∆V_CAP(LOAD) Gate Bias LDO Load Regulation
V_IN = 5V, I_GATE = 15mA
9V ≤ V_IN ≤ 60V, I_GATE = 0mA
Load = 0mA to 20mA
0.2
0.5
V
0.002 0.03
%/V
–3.5
%
R_UP
Gate Pull-Up Resistance
Gate High
2
Ω
R_DN
Gate Pull-Down Resistance
Overvoltage
Gate Low
0.9
Ω
V_FBOV
V_FB Overvoltage Lockout Threshold
GATE Going High without Delay,
V_FB(OV)-V_FB(NOM) in Percent
10
%
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: Continuous operation above the specified maximum operating
junction temperature may impair device reliability or permanently damage
the device.
Note 3: The junction temperature (T_J in °C) is calculated from the ambient
temperature (T_A in °C) and power dissipation (P_D in Watts) as follows:
T_J = T_A + (P_D • θ_JA)
where θ_JA (in °C/W) is the package thermal impedance provided in the Pin
Configuration section for the corresponding package.
Note 4: The LTC3863 is tested under pulsed load conditions such that T_J
≈ T_A. The LTC3863E is guaranteed to meet performance specifications
from 0°C to 85°C operating junction temperature range. The LTC3863E
specifications over the –40°C to 125°C operating junction temperature
range are assured by design, characterization and correlation with
statistical process controls. The LTC3863I is guaranteed to meet
performance specifications over the –40°C to 125°C operating junction
temperature range, the LTC3863H is guaranteed over the –40°C to 150°C
operating junction temperature range, and the LTC3863MP is guaranteed
and tested over the full –55°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. 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.
Note 5: The LTC3863 is tested in a feedback loop that adjust V_REG
or (V_FB – V_FBN) to achieve a specified error amplifier output voltage
(on ITH pin).
3863fa
4
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