LT3840
4
3840fa
For more information www.linear.com/LT3840
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Good
PG Threshold as a Percentage of V
FB
V
FB
Rising
l
87 90 93 %
PG Hysteresis as a Percentage of V
FB
2.5 %
PG Leakage V
PG
= 5V 0.1 1 µA
PG Sink Current V
PG
= 0.3V
l
35 65 µA
MOSFET Gate Drivers
Non-Overlap Time TG to BG 75 ns
Non-Overlap Time BG to TG 75 ns
TG Minimum On Time 150 ns
TG Minimum Off Time 240 ns
TG Maximum Duty Cycle R
T
= 49.9k 99 %
TG, BG Drive On Voltage 7.5 V
TG, BG Drive Off Voltage 5 mV
TG, BG Drive Rise Time C
TG
= C
BG
= 3300pF 20 ns
TG, BG Drive Fall Time C
TG
= C
BG
= 3300pF 20 ns
BOOST UVLO (Rising) V
BOOST
- V
SW
4.5 5.3 V
BOOST UVLO Hysteresis 350 mV
Internal Auxiliary Supply
INTV
CC
Regulation Voltage
l
7.25 7.5 7.75 V
INTV
CC
UVLO Threshold (Rising) 6.25 6.5 6.75 V
INTV
CC
UVLO Hysteresis 300 mV
INTV
CC
Current in Shutdown V
EN
= 0.3V 6 µA
INTV
CC
Output Current 2.5V ≤ V
IN
≤ 60V (Note 4)
l
100 mA
INTV
CC
Burst Mode Current V
MODE
= 0V 60 µA
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 LT3840E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature.
Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization, and correlation with statistical process controls. The
LT3840I is guaranteed over the –40°C to 125°C operating junction
temperature range. The LT3840H is guaranteed over the full –40°C to
150°C operating junction temperature range. The LT3840MP is 100%
tested and guaranteed over the –55°C to 150°C temperature range. High
junction temperatures degrade operating lifetimes; Operating lifetime is
derated for junction temperatures greater than 125°C.
Note 3:
Supply current specification does not include switch drive
currents. Actual supply currents will be higher.
Note 4: Specification is not tested but is guaranteed by design,
characterization and correlation with statistical process controls.
