Datasheet

LM3407
SNVS553B –JANUARY 2008–REVISED MAY 2013 www.ti.com
ELECTRICAL CHARACTERISTICS
V
IN
= 12V unless otherwise indicated. Typical and limits appearing in plain type apply for T
A
= T
J
= 25°C (Note 4). Limits
appearing in boldface type apply over full Operating Temperature Range. Datasheet min/max specification limits are
specified by design, test, or statistical analysis.
Parameter Test Conditions Min Typ Max Units
SYSTEM PARAMETERS
I
IN
Operating Input Current 4.5V ≤ V
IN
≤ 30V 0.58 0.78 0.98 mA
V
EN
= 5V, V
PWM
= 5V, LX = open
I
Q
Quiescent Input current 4.5V ≤ V
IN
≤ 30V 0.20 0.27 0.39 mA
V
EN
= 5V, V
PWM
= 0V
I
SHUT
Shutdown Input Current V
EN
= 0V 36 48 60 µA
V
UVLO
Input Under Voltage Lock-out Threshold V
IN
Rising 3.6 4.5 V
V
UVLO-HYS
UVLO Hysteresis V
IN
Falling 200 mV
V
EN_H
EN pin HIGH Threshold V
EN
Rising 1.9 2.4 V
V
EN_L
EN pin LOW Threshold V
EN
Falling 1.3 1.75 V
V
DIM_H
DIM pin HIGH Threshold V
DIM
Rising 1.9 2.4 V
V
DIM_L
DIM pin LOW Threshold V
DIM
Falling 1.3 1.75 V
f
SW
Switching Frequency R
T
= 80 kΩ 500 kHz
R
T
= 40 kΩ 1000
t
ON-MIN
Minimum On-time 200 ns
T
SD
Thermal Shutdown Threshold 165 °C
T
SD-HYS
Thermal Shutdown Hysteresis 25 °C
INTERNAL VOLTAGE REGULATOR
V
CC
VCC Regulator Output Voltage
(1)
V
IN
= 12V 4.5 V
N-MOSFET DRIVER
R
DS(ON)
Main Switch ON Resistance I
sink
= 80mA 0.77 1.45 Ω
CONTROL LOOP
A
EA
Error Amp Open Loop Gain 60 dB
(1) V
CC
provides self bias for the internal gate drive and control circuits. Device thermal limitations limit external loading to the pin.
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