Datasheet

LM3102
www.ti.com SNVS515G –SEPTEMBER 2007–REVISED JANUARY 2012
ELECTRICAL CHARACTERISTICS (continued)
Specifications with standard type are for T
J
= 25°C only; limits in boldface type apply over the full Operating Junction
Temperature (T
J
) range. Minimum and Maximum limits are specified through test, design, or statistical correlation. Typical
values represent the most likely parametric norm at T
J
= 25°C, and are provided for reference purposes only. Unless
otherwise stated the following conditions apply: V
IN
= 18V, V
OUT
= 3.3V.
Symbol Parameter Conditions Min Typ Max Units
Soft-start
I
SS
SS pin source current V
SS
= 0.5V 6 8 10 µA
Current Limit
I
CL
Syn. MOSFET current limit threshold LM3102 2.7 A
I
CL
Syn. MOSFET current limit threshold LM3102TLX–1 1.5 A
ON/OFF Timer
t
on
ON timer pulse width V
IN
= 10V, R
ON
= 100 kΩ 1.38 µs
V
IN
= 30V, R
ON
= 100 kΩ 0.47
t
on-MIN
ON timer minimum pulse width 150 ns
t
off
OFF timer pulse width 260 ns
Enable Input
V
EN
EN Pin input threshold V
EN
rising 1.13 1.18 1.23 V
V
EN-HYS
Enable threshold hysteresis V
EN
falling 90 mV
Regulation and Over-Voltage Comparator
V
FB
In-regulation feedback voltage V
SS
≥ 0.8V 0.784 0.8 0.816 V
T
J
= −40°C to +125°C
V
SS
≥ 0.8V 0.788 0.812
T
J
= 0°C to +125°C
V
FB-OV
Feedback over-voltage threshold 0.888 0.920 0.945 V
I
FB
5 nA
Thermal Shutdown
T
SD
Thermal shutdown temperature T
J
rising 165 °C
T
SD-HYS
Thermal shutdown temperature T
J
falling 20 °C
hysteresis
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