High-Power, High-Current LED Driver Family Powers High-Brightness LEDs

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LM3401

The LM3401 is a switching controller designed to provide constant current to high power LEDs. The LM3401 drives an external P-MOSFET switch for step-down (Buck) regulators. The LM3401 delivers constant current within ±6% accuracy to a wide variety and number of series connected LEDs. Output current is adjusted with an external current sensing resistor to drive high power LEDs in excess of 1A.

For improved accuracy and efficiency, the LM3401 features dual-side hysteresis, very low reference voltage and short propagation delay. A cycle by cycle current limit provides protection against over current and short circuit failures. Additional features include adjustable hysteresis and a CMOS compatible input pin for PWM dimming.

 

PARAMETRIC TABLE Topology: Buck Hysteretic Controller Input Min Voltage: 4.5V Input Max Voltage: 35V Output Min: 0.2V Adjustable Output: Yes Output Range: 200mV to VIN Special Features: Adjustable Hysteresis, 200mV Reference On/Off Pin: Yes Error Flag: No Switching Frequency: 1500000Hz Adj Switch Frequency: No Sync Pin: No Efficiency: 92 % Step-Down: Yes Step-Up: No Inverting: No Flyback: No Reg Type: Switching Controller Temperature Min: -40ºC Temperature Max: 125ºC

FEATURES Hysteretic control for speed and simplicity Input operating range of 4.5V-35V 1.5MHz maximum switching frequency Low 200mV reference voltage Programmable current limit High speed CMOS compatible enable/dimming Adjustable hysteresis Input UVLO No output capacitor required MSOP-8 package     APPLICATIONS LED driver Battery charger

 

 

 

 

 

LM3402/02HV

The LM3402/02HV 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 735mA (typical) for step-down (Buck) regulators. Hysteretic control with controlled on-time coupled with an external resistor allow the converter output voltage to adjust as needed to deliver a constant current to series and series - parallel connected arrays of LEDs of varying number and type, LED dimming by pulse width modulation (PWM), broken/open LED protection, low power shutdown and thermal shutdown complete the feature set.

 

PARAMETRIC TABLE Topology: Constant Current Buck Input Min Voltage: 6V Input Max Voltage: 42V Adjustable Output: Yes Output Current: 525mA On/Off Pin: Yes Error Flag: No Switching Frequency: 1000000Hz Adj Switch Frequency: Yes Sync Pin: No Efficiency: 92 % Step-Down: Yes Step-Up: No Inverting: No Flyback: No Reg Type: Switching Regulator Temperature Min: -40ºC Temperature Max: 125ºC

FEATURES Integrated 0.5A N-channel MOSFET VIN range from 6V to 42V (LM3402) VIN range from 6V to 75V (LM3402HV) 500mA output current over temperature Cycle-by-cycle current limit No control loop compensation required Separate PWM dimming and low power shutdown Supports all-ceramic output capacitors and capacitor-less outputs Thermal shutdown protection MSOP-8, PSOP-8 packages     APPLICATIONS LED driver Constant current source Automotive lighting General illumination Industrial lighting

 

 

 

 

 

 

 

 

LM3404/04HV

The LM3404/04HV 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 1.5A (typical) for step-down (Buck) regulators. Hysteretic controlled on-time and an external 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), broken/open LED protection, low-power shutdown and thermal shutdown complete the feature set.

 

PARAMETRIC TABLE Topology: Buck Input Min Voltage: 6V Input Max Voltage: 42V Output Min: 0.2V Output Max: 40V Adjustable Output: Yes Output Current: 1000mA Special Features: Current Regulation On/Off Pin: Yes Error Flag: No Switching Frequency: 1000000 Hz Adj Switch Frequency: Yes Sync Pin: No Step-Down: Yes Step-Up: No Inverting: No Flyback: No Reg Type: Switching Regulator Temperature Min: -40ºC Temperature Max: 125ºC

FEATURES Integrated 1.0A MOSFET VIN range 6V to 42V (LM3404) VIN range 6V to 75V (LM3404HV) 1.2A output current over temperature Cycle-by-cycle current limit No control loop compensation required Separate PWM dimming and low power shutdown Supports all-ceramic output capacitors and capacitor-less outputs Thermal shutdown protection SO-8 Package, PSOP-8 package     APPLICATIONS LED driver Constant current source Automotive lighting General illumination Industrial lighting

 

 

 

 

LM3405

Integrated with a 1A power switch, the LM3405 is a current-mode control switching buck regulator designed to provide a simple, high efficiency solution for driving high power LEDs. With a 0.205V reference voltage feedback control to minimize power dissipation, an external resistor sets the current as needed for driving various types of LEDs. Switching frequency is internally set to 1.6MHz, allowing small surface mount inductors and capacitors to be used.

The LM3405 utilizes current-mode control and internal compensation offering ease of use and predictable, high performance regulation over a wide range of operating conditions. Additional features include user accessible EN/DIM pin for enabling and PWM dimming of LEDs, thermal shutdown, cycle-by-cycle current limit and over-current protection.

 

PARAMETRIC TABLE Topology: Buck Input Min Voltage: 3.0V Input Max Voltage: 15V Output Min: 0.2V Output Max: 13.5V Adjustable Output: Yes Output Range: 0.2V to 13.5V Output Current: 1000mA Special Features: Current regulator On/Off Pin: Yes Error Flag: No Switching Frequency: 1600000Hz Adj Switch Frequency: No Sync Pin: No Efficiency: 92 % Step-Down: Yes Step-Up: No Inverting: No Flyback: No Reg Type: Switching Regulator Temperature Min: -40ºC Temperature Max: 125ºC

FEATURES VIN operating range of 3V to 15V Thin SOT23-6 package 1.6MHz switching frequency 300mΩ NMOS switch 40nA shutdown current at VIN = 5V EN/DIM input for enabling and PWM dimming of LEDs Internally compensated current-mode control Cycle-by-cycle current limit Input voltage UVLO Over-current protection Thermal shutdown     APPLICATIONS LED driver Constant current source Industrial lighting LED flashlights

 

 

 

 

 

 

 Featured Products

Part Number		Description	Data Sheet	App. Notes
LM3401MM/NOPB		Hysteretic PFET Controller for High Power LED Drive
LM3402EVAL		Evaluation Board for the LM3402 Buck Regulator
LM3402HVEVAL		Evaluation Board for the LM3402HV Buck Regulator
LM3402HVMM/NOPB		0.5A Constant Current Buck Regulator for High Power LED Driver
LM3402MM/NOPB		0.5A Constant Current Buck Regulator for High Power LED Driver
LM3404HVEVAL		Evaluation Board for the LM3404HV Buck Regulator
LM3404HVMA/NOPB		1A Constant Current Buck Regulator for High Power LED Driver
LM3404MR/NOPB		1A Constant Current Buck Regulator for High Power LED Driver
LM3405AXMKE/NOPB		1.6MHz 1A Constant Current Buck Regulator for Powering LEDs
LM3405XEVAL		Evaluation Board for the LM3405 Buck Regulator
LM3405XMK/NOPB		1.6MHz 1A Constant Current Buck Regulator for Powering LEDs

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