1.5A Constant Current Buck Regulator for Driving High Power LEDs - LM3406

LM3406 (ACTIVE)

1.5A Constant Current Buck Regulator for Driving High Power LEDs

Recommended alternative parts

  • LM3401  -  PFET Controller, Scalable Output Current Up To 4A

Description

The LM3406 family are monolithic switching regulators designed to deliver constant currents to high power LEDs. Ideal for automotive, industrial, and general lighting applications, they contain a high-side N-channel MOSFET switch with a current limit of 2.0A (typical) for step-down (Buck) regulators. Controlled on-time with true average current and an external current sense resistor allow the converter output voltage to adjust as needed to deliver a constant current to series and series-parallel connected LED arrays of varying number and type. LED dimming via pulse width modulation (PWM) is achieved using a dedicated logic pin or by PWM of the power input voltage. The product feature set is rounded out with low-power shutdown and thermal shutdown protection.

Features

  • LM3406HV-Q1
    • Automotive Grade Device
    • AEC-Q100 Grade 1 Qualified
    • Operating Ambient Temperature: –40°C to 125°C
  • Integrated 2.0A MOSFET
  • VIN Range 6V to 42V (LM3406)
  • VIN Range 6V to 75V (LM3406HV)
  • VIN Range 6V to 75V (LM3406HV-Q1)
  • True Average Output Current Control
  • 1.7A Minimum Output Current Limit Over Temperature
  • Cycle-by-Cycle Current Limit
  • PWM Dimming with Dedicated Logic Input
  • PWM Dimming with Power Input Voltage
  • Simple Control Loop Compensation
  • Low Power Shutdown
  • Supports All-Ceramic Output Capacitors and Capacitor-less Outputs
  • Thermal Shutdown Protection
  • TSSOP-14 Package

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Parametrics Compare all products in LED Lighting - Illumination

 
Input Voltage (Type)
Vin (Min) (V)
Vin (Max) (V)
Iout (Max) (A)
Vout (Min) (V)
Vout (Max) (V)
Regulated Outputs (#)
Topology
Dimming Method
Type
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Vref (V)
UVLO Thresholds On/Off (V)
Special Features
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
LM3406 LM3402 LM3402HV LM3404 LM3404HV LM3406HV LM3406HV-Q1
DC/DC     DC/DC     DC/DC     DC/DC     DC/DC     DC/DC     DC/DC    
6     6     6     6     6     6     6    
42     42     75     42     75     75     75    
1.5     0.525     0.525     1     1     1.5      
0.2     0.2     0.2     0.2     0.2     0.2     73    
40     40     73     40     73     73     0.2    
1     1     1     1     1     1      
Buck     Buck     Buck     Buck     Buck     Buck     Buck    
PWM
2-Wire    
PWM     PWM     PWM     PWM     PWM
2-Wire    
2-Wire
PWM    
Inductive     Inductive     Inductive     Inductive     Inductive     Inductive     Inductive    
20     20     20     20     20     20     20    
1000     1000     1000     1000     1000     1000     1000    
1.2     0.6     0.6     0.625     0.625     1.2     1.2    
0.2     0.2     0.2     0.2     0.2     0.2     0.2    
5.25 / 5.10     5.25 / 5.10     5.25 / 5.10     5.3 / 5.15     5.3 / 5.15     5.25 / 5.10      
Adjustable Switch Frequency
Enable/Shutdown
Thermal Shutdown
Integrated Switch    
Adjustable Switch Frequency
Enable/Shutdown
Thermal Shutdown
Integrated Switch    
Adjustable Switch Frequency
Enable/Shutdown
Thermal Shutdown
Integrated Switch    
Adjustable Switch Frequency
Enable/Shutdown
Thermal Shutdown
Integrated Switch    
Adjustable Switch Frequency
Enable/Shutdown
Thermal Shutdown
Integrated Switch    
Adjustable Switch Frequency
Enable/Shutdown
Thermal Shutdown
Integrated Switch    
Adjustable Switch Frequency
Enable/Shutdown
Integrated Switch
Thermal Shutdown    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Automotive    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 150    
14HTSSOP     8SO PowerPAD
8VSSOP    
8SO PowerPAD
8VSSOP    
8SO PowerPAD
8SOIC    
8SO PowerPAD
8SOIC    
14HTSSOP     14HTSSOP    
0.95 | 1ku     0.80 | 1ku     0.85 | 1ku     0.85 | 1ku     0.90 | 1ku     1.00 | 1ku     1.17 | 1ku    
WEBENCH® LM3406
 
6.00 <=


V in Lower
 V
 
<=


V in Upper
 V
 
<= 42.00
Ambient Temp  °C <= 100
Light Output (optional)  Lumens



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