SNVS678F June   2010  – November 2015 LM3414 , LM3414HV

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Pulse-Level-Modulation (PLM) Operation Principles
      2. 7.3.2 Minimum Switch ON-time
      3. 7.3.3 Peak Switch Current Limit
      4. 7.3.4 PWM Dimming Control
      5. 7.3.5 Analog Dimming Control
      6. 7.3.6 Internal VCC Regulator
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Setting the Switching Frequency
      2. 8.1.2 Setting LED Current
      3. 8.1.3 Inductor Selection
    2. 8.2 Typical Applications
      1. 8.2.1 LM3414/HV Design Example
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Calculate Operating Parameters
          2. 8.2.1.2.2 Calculate RIADJ
          3. 8.2.1.2.3 Calculate RFS
          4. 8.2.1.2.4 Calculate LMIN
          5. 8.2.1.2.5 Calculate CIN-MIN
      2. 8.2.2 LM3414/HV Design Example (IOUT = 1 A)
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1 Calculate Operating Parameters
          2. 8.2.2.2.2 Calculate RIADJ
          3. 8.2.2.2.3 Calculate RFS
          4. 8.2.2.2.4 Calculate LMIN
          5. 8.2.2.2.5 Calculate CIN-MIN
        3. 8.2.2.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Related Links
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

5 Pin Configuration and Functions

DDA Package
8-Pin SOIC
Top View
LM3414 LM3414HV pinout_01_snvs678.gif
NGQ Package
8-Pin WSON
Top View
LM3414 LM3414HV pinout_02_snvs678.gif

Pin Functions

PIN I/O DESCRIPTION
NAME NO.
VCC 1 O Internal Regulator Output Pin. This pin should be bypassed to ground by a ceramic capacitor with a minimum value of 1 µF.
PGND 2 — Power Ground Pin. Ground for power circuitry. Reference point for all stated voltages. Must be externally connected to EP and GND.
IADJ 3 I Average Output Current Adjustment Pin. Connect resistor RIADJ from this pin to ground to adjust the average output current.
GND 4 — Analog Ground Pin. Analog ground connection for internal circuitry, must be connected to PGND external to the package.
FS 5 I Switching Frequency Setting Pin. Connect resistor RFS from this pin to ground to set the switching frequency.
DIM 6 I PWM Dimming Control Pin. Apply logic level PWM signal to this pin controls the intend brightness of the LED string.
LX 7 O Drain of N-MOSFET Switch. Connect this pin to the output inductor and anode of the schottky diode.
VIN 8 I Input Voltage Pin. The input voltage should be in the range of 4.5 V to 42 V (LM3414) or 4.5 V to 65 V (LM3414HV).
EP EP — Thermal Pad (Power Ground). Used to dissipate heat from the package during operation. Must be electrically connected to PGND external to the package.