Datasheet
Package Availability, Models, Samples & Pricing
| Part Number | Package | Factory Lead Time | Models | Samples &
Electronic
Orders | Budgetary Pricing | Std
Pack
Size | Package
Marking
Format |
| Type | Pins | Spec. | MSL
Rating | Peak
Reflow | RoHS
Report | CAD
Symbols | Weeks | Qty | Qty | $US each |
| LM3423MHBKBSTEV | LM3423 - Buck-Boost N-Channel Controllers for Constant Current LED Drivers | Full production | N/A
|
| 1+ | $110.00 | 1 | - |
| 8 weeks | N/A |
| LM3423MHBSTEVAL | LM3423 - N-Channel Controllers for Constant Current LED Drivers from the PowerWise? Family | Full production | N/A
|
| 1+ | $110.00 | 1 | - |
| 8 weeks | N/A |
| LM3421MH | TSSOP EXP PAD | 16 | NOPB | 1 | 260 | RoHS |
N/A |
Full production | N/A
| 
| 1K+ | $1.55 | rail
of
92 | NSUZXYTT
LM3421
MH |
| 6 weeks | N/A |
| LM3421MHX | TSSOP EXP PAD | 16 | NOPB | 1 | 260 | RoHS |
N/A |
Full production | N/A
|
| 1K+ | $1.55 | reel
of
2500 | NSUZXYTT
LM3421
MH |
| 8 weeks | N/A |
General Description
The LM3421/LM3423 devices are versatile high voltage LED driver controllers. With the capability to be configured in a Buck,
Boost, Buck-Boost (Flyback), or SEPIC topology, and an input operating voltage rating of 75V, these controllers are ideal
for illuminating LEDs in a very diverse, large family of applications.
Adjustable high-side current sense with a typical sense voltage of 100mV allows for tight regulation of the LED current with
the highest efficiency possible. Output LED current regulation is based on peak current-mode control with predictive Off-Time
Control. This method of control eases the design of loop compensation while providing inherent input voltage feed-forward
compensation.
The LM3421/LM3423 include a high-voltage startup regulator that operates over a wide input range of 4.5V to 75V. The internal
PWM controller is designed for adjustable switching frequencies of up to 2.0MHz, thus enabling compact solutions. Additional
features include: “zero” current shutdown, precision reference, logic compatible DIM input suitable for fast PWM dimming,
cycle-by-cycle current limit, and thermal shutdown.
The LM3423 also includes an LED output status flag, a fault flag, a programmable fault timer, and a logic input to select
the polarity of the dimming output driver.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
|
LM3421MH | ABCD150XV1 | 0 | 3868 | 0 | 0 | 2595000 | 2 | 736338335
|
|
LM3421MHX | ABCD150XV1 | 0 | 3868 | 0 | 0 | 2595000 | 2 | 736338335
|
Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR.
The Long Term Failure Rates were calculated
at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress
temperature of 150°C to an application temperature of 55°C.
For more information on Reliability Metrics, please click here.
Application Notes
| Title | Size in Kbytes |
Date |
 |
| AN-1907: Application Note 1907 LM3423 Buck-Boost Configuration Evaluation Board |
879
Kbytes |
8-Dec-08 |
Download |
More Application Notes
| Title | Size in Kbytes |
Date |
|
| AN-1982: Application Note 1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool |
63
Kbytes |
15-Jul-09 |
Download |
| AN-1872: Application Note 1872 LM3423 Boost Evaluation Board |
764
Kbytes |
8-Dec-08 |
Download |
| AN-1969: Application Note 1969 LM3424 Boost Evaluation Board |
988
Kbytes |
22-Aug-09 |
Download |
| AN-1967: Application Note 1967 LM3424 Buck-Boost Evaluation Board |
1027
Kbytes |
22-Aug-09 |
Download |
| AN-1985: Application Note 1985 LM3429 Buck-Boost Evaluation Board |
705
Kbytes |
3-Aug-09 |
Download |
| AN-1986: Application Note 1986 LM3429 Boost Evaluation Board |
672
Kbytes |
3-Aug-09 |
Download |
[Information as of 7-Nov-2009]
|
RoHS Compliance Information