Datasheet
LM3100
SNVS421G –JANUARY 2006–REVISED APRIL 2013
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Electrical Characteristics
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 ensured 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
Start-Up Regulator, V
CC
V
CC
V
CC
output voltage C
CC
= 680nF, no load 5.0 6.0 7.2 V
V
IN
- V
CC
V
IN
- V
CC
dropout voltage I
CC
= 2mA 50 140 mV
I
CC
= 20mA 350 570
I
VCCL
V
CC
current limit
(1)
V
CC
= 0V 40 65 mA
V
CC-UVLO
V
CC
under-voltage lockout threshold V
IN
increasing 3.6 3.75 3.85 V
(UVLO)
V
CC-UVLO-HYS
V
CC
UVLO hysteresis V
IN
decreasing 130 mV
t
VCC-UVLO-D
V
CC
UVLO filter delay 3 µs
I
IN
I
IN
operating current No switching, V
FB
= 1V 0.7 1 mA
I
IN-SD
I
IN
operating current, Device shutdown V
EN
= 0V 17 30 µA
Switching Characteristics
R
DS-UP-ON
Main MOSFET Rds(on) 0.18 0.35 Ω
R
DS- DN-ON
Syn. MOSFET Rds(on) 0.11 0.2 Ω
V
G-UVLO
Gate drive voltage UVLO V
BST
- V
SW
increasing 3.3 4 V
Soft-start
I
SS
SS pin source current V
SS
= 0.5V 6 8 9.8 µA
Current Limit
I
CL
Syn. MOSFET current limit threshold 1.9 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 200 ns
t
OFF
OFF timer pulse width 260 ns
Enable Input
V
EN
EN Pin input threshold V
EN
rising 1.236 1.26 1.285 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 0.894 0.920 0.940 V
I
FB
5 100 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
(1) V
CC
provides self bias for the internal gate drive and control circuits. Device thermal limitations limit external loading.
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