The LM3402/HV 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 735 mA (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.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
LM3402/HV | VSSOP (8) | 3.00 mm × 3.00 mm |
HSOP (8) | 4.89 mm × 3.90 mm |
Changes from E Revision (April 2013) to F Revision
Changes from D Revision (May 2013) to E Revision
PIN | I/O | DESCRIPTION | |
---|---|---|---|
NO. | NAME | ||
1 | SW | O | Switch pin. Connect this pin to the output inductor and Schottky diode. |
2 | BOOT | O | MOSFET drive bootstrap pin. Connect a 10-nF ceramic capacitor from this pin to SW. |
3 | DIM | I | Input for PWM dimming. Connect a logic-level PWM signal to this pin to enable and disable the power MOSFET and reduce the average light output of the LED array. |
4 | GND | — | Ground pin. Connect this pin to system ground. |
5 | CS | I | Current sense feedback pin. Set the current through the LED array by connecting a resistor from this pin to ground. |
6 | RON | I | ON-time control pin. A resistor connected from this pin to VIN sets the regulator controlled ON-time. |
7 | VCC | O | Output of the internal 7-V linear regulator. Bypass this pin to ground with a minimum 0.1-µF ceramic capacitor with X5R or X7R dielectric. |
8 | VIN | I | Input voltage pin. Nominal operating input range for this pin is 6 V to 42 V (LM3402) or 6 V to 75 V (LM3402HV). |
DAP | — | Thermal Pad. Connect to ground. Place 4-6 vias from DAP to bottom layer ground plane. |