Datasheet
LM3424
www.ti.com
SNVS603B –AUGUST 2009–REVISED OCTOBER 2009
ELECTRICAL CHARACTERISTICS
(1)
(continued)
Specifications in standard type face are for T
J
= 25°C and those with boldface type apply over the full Operating
Temperature Range ( T
J
= −40°C to +125°C). 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 condition applies: V
IN
= +14V.
Min Typ Max
Symbol Parameter Conditions Units
(2) (3) (2)
CURRENT LIMIT (IS)
V
LIM
Current Limit Threshold 215 245 275 mV
V
LIM
Delay to Output 35 75
ns
t
ON-MIN
Leading Edge Blanking
140 240 340
Time
HIGH SIDE TRANSCONDUCTANCE AMPLIFIER
Input Bias Current 10 µA
Transconductance 20 mA/V
Input Offset Current -1.5 0 1.5 µA
Input Offset Voltage -5 0 5 mV
Transconductance I
CSH
= 100 µA
(5)
500 kHz
Bandwidth
GATE DRIVER (GATE)
R
SRC-GATE
GATE Sourcing GATE = High
2.0 6.0
Resistance
Ω
R
SNK-GATE
GATE Sinking Resistance GATE = Low 1.3 4.5
UNDER-VOLTAGE LOCKOUT and DIM INPUT (nDIM)
V
TH-nDIM
nDIM / UVLO Threshold 1.185 1.240 1.285 V
I
HYS-nDIM
nDIM Hysteresis Current 13 20 27 µA
DIM DRIVER (DDRV)
R
SRC-DDRV
DDRV Sourcing DDRV = High
13.5 30.0
Resistance
Ω
R
SNK-DDRV
DDRV Sinking Resistance DDRV = Low 3.5 10.0
nDIM rising to DDRV
700
rising
ns
nDIM rising to DDRV
360
falling
SOFT-START (SS)
I
SS
Soft-start current 10 µA
THERMAL CONTROL
V
S
V
S
Voltage I
VS
= 0A
2.40 2.45 2.50 V
I
VS
= 1 mA
TREF input bias current V
TREF
= 1.5V
0.1
V
TSENSE
= 1.5V
TSENSE Input Bias V
TREF
= 1.5V
0.1
Current V
TSENSE
= 1.5V
I
TGAIN-MAX
TGAIN Maximum V
TGAIN
= 2V
200 600
Sourcing Current
µA
I
TF
CSH Current with High- R
TGAIN
= V
TREF
= 1.5V
100
side Amplifier Disabled 10 kΩ V
TSENSE
= 0.5V
V
TREF
= 1.5V
10
V
TSENSE
= 1.4V
V
TREF
= 1.5V
2
V
TSENSE
= 1.5V
(5) These electrical parameters are specified by design, and are not verified by test.
Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 7
Product Folder Links: LM3424