LM3401MM/NOPB National Semiconductor, LM3401MM/NOPB Datasheet - Page 15

• Manufacturer Part Number: LM3401MM/NOPB
• Description: IC LED DRIVER HIGH BRIGHT 8-MSOP
• Manufacturer: National Semiconductor
• Series: PowerWise®r
• Type: HBLED Driverr

Specifications of LM3401MM/NOPB

• Constant Current: Yes
• Topology: PWM, Step-Down (Buck)
• Number Of Outputs: 1
• Internal Driver: No
• Type - Primary: General Purpose
• Type - Secondary: High Brightness LED (HBLED)
• Frequency: 1.5MHz
• Voltage - Supply: 4.5 V ~ 35 V
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Operating Temperature: -40°C ~ 125°C
• Current - Output / Channel: 1A
• Internal Switch(s): Yes
• Efficiency: 92%
• Operating Supply Voltage (typ): 5/9/12/15/18/24V
• Number Of Segments: 1
• Operating Temperature (min): -40C
• Operating Temperature (max): 125C
• Operating Temperature Classification: Automotive
• Package Type: MSOP
• Pin Count: 8
• Mounting: Surface Mount
• Power Dissipation: 660mW
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 35V
• For Use With: LM3401EVAL - BOARD EVALUATION FOR LM3401
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Lead Free Status / Rohs Status: Compliant
• Other names: LM3401MMTR

This is the estimated amount of LED current variation over the
input voltage range. If the minimum input voltage was below
Parameter
Regulation
Accuracy
Ta_max
I
PFET
LED_PK
I
ripple
R1
R2
f
R3
C1
D1
C2
L1
sw
2.2 µF, 50V ceramic
40V, 1.8A, 130 mΩ
33 µH, >804 mA
1.0 µF, 50V
290 mΩ
40V, 1A
5.6 kΩ
±6.1%
108°C
Value
46 kΩ
1.6%
-
-
-
TABLE 1. Design Example Summary
0.95A minimum peak current limit
±42 mA max variation
±22.4 mV hysteresis
LED ripple reduction
15
11 mA variation
>345 mA rms
1MHz typical
690 mA DC
227 mA p-p
17V, the LED current variation would be calculated using the
100% duty cycle equation.
804 mA
Result
V
HYS
= 112 mV(adjustable)
219 kHz min
part-to-part
worst case
worst case
worst case
Comment
adjustable
Schottky
optional
vs VIN
1%
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