LM3407_09 Datasheet, PDF (3/16 Pages) National Semiconductor (TI) – 350 mA, Constant Current Output Floating Buck Switching Converter for High Power LEDs

Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN to GND
VIN to GND (Transient)
LX to GND
LX to GND (Transient)
ISNS, FS, DIM, EN to GND
ESD Rating
Human Body Model (Note 2)
-0.3V to 36V
42V (500 ms)
-0.3V to 36V
-3V (2 ns), 42V (500 ms)
-0.3V to 7V
2kV
Junction Temperature
Storage Temperature
Soldering Information
Lead Temperature (Soldering,
10sec)
Infrared or Convection (20sec)
Operating Ratings
V_IN
Junction Temperature Range
Thermal Resistance (θ_JA) (Note 3)
150°C
−65°C to + 125°C
260°C
235°C
4.5V to 30V
−40°C to + 125°C
50°C/W
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 guaranteed by design, test, or statistical analysis.
Symbol
Parameter
Conditions
SYSTEM PARAMETERS
I_IN
I_Q
I_SHUT
V_UVLO
V_UVLO-HYS
V_{EN_H}
V_{EN_L}
V_{DIM_H}
V_{DIM_L}
f_SW
Operating Input Current
4.5V ≤ V_IN ≤ 30V
V_EN = 5V, V_PWM = 5V, LX = open
Quiescent Input current
4.5V ≤ V_IN ≤ 30V
V_EN = 5V, V_PWM = 0V
Shutdown Input Current
V_EN = 0V
Input Under Voltage Lock-out Threshold V_IN Rising
UVLO Hysteresis
V_IN Falling
EN pin HIGH Threshold
V_EN Rising
EN pin LOW Threshold
V_EN Falling
DIM pin HIGH Threshold
V_DIM Rising
DIM pin LOW Threshold
V_DIM Falling
Switching Frequency
R_T = 80 kΩ
t_ON-MIN
Minimum On-time
T_SD
Thermal Shutdown Threshold
T_SD-HYS
Thermal Shutdown Hysteresis
INTERNAL VOLTAGE REGULATOR
R_T = 40 kΩ
V_CC
VCC Regulator Output Voltage (Note 5) V_IN = 12V
N-MOSFET DRIVER
R_DS(ON)
Main Switch ON Resistance
CONTROL LOOP
I_sink = 80mA
A_EA
Error Amp Open Loop Gain
Min Typ Max Units
0.58 0.78 0.98 mA
0.20 0.27 0.39 mA
36
48
60
µA
3.6 4.5
V
200
mV
1.9 2.4
V
1.3 1.75
V
1.9 2.4
V
1.3 1.75
V
500
kHz
1000
200
ns
165
°C
25
°C
4.5
V
0.77 1.45 Ω
60
dB
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the
device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin.
Note 3: θ_JA of 50°C/W with thermal pad, EP soldered to a minimum of 2 square inches of 1 oz. Copper on the top or bottom PCB layer.
Note 4: Typical specification represent the most likely parametric norm at 25°C operation.
Note 5: 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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