LM3409 Datasheet, PDF (4/30 Pages) National Semiconductor (TI) – PFET Buck Controller for High Power LED Drives

Symbol
Parameter
V_UVLO-R
I_UVLO-HYS
ENABLE
I_EN
V_EN-TH
Rising UVLO threshold
UVLO hysteresis current
EN pin current
EN pin threshold
V_EN-HYS
EN pin hysteresis
t_EN-R
EN pin rising delay
t_EN-F
EN pin falling delay
THERMAL RESISTANCE
θ_JA
Junction to Ambient
Conditions
V_EN rising
V_EN falling
EN rise - PGATE fall
EN fall - PGATE rise
eMSOP-10 Package (Note 5)
Min Typ Max
(Note 4) (Note 3) (Note 4)
1.175 1.243 1.311
22
Units
V
µA
10
nA
1.74
V
.5
420
mV
42
ns
21
ns
50
°C/W
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur, including inoperability and degradation of device reliability
and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or other conditions beyond those indicated in
the Operating Ratings is not implied. The recommended Operating Ratings indicate conditions at which the device is functional and the device should not be
operated beyond such conditions.
Note 2: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin.
Note 3: Typical values represent most likely parametric norms at the conditions specified and are not guaranteed.
Note 4: Min and Max limits are 100% production tested at 25°C. Limits over the operating temperature range are guaranteed through correlation using Statistical
Quality Control (SQC) methods. Limits are used to calculate National's Average Outgoing Quality Level (AOQL).
Note 5: θ_JA of 50°C/W with DAP soldered to a minimum of 2 square inches of 1oz. copper on the top or bottom PCB layer. Actual value will be different depending
upon the application enviroment.
Note 6: The current sense threshold limits are calculated by averaging the results from the two polarities of the high-side differential amplifier.
Note 7: The measurements were made using the Bill of Materials from Design #3.
Note 8: The measurements were made using the Bill of Materials from Design #3 except the LM3409 was substituted for the LM3409HV.
Note 9: The waveforms were acquired using the standard evaluation board from AN-1953.
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