SNVS089O July   2000  – July 2015 LM3488

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 : LM3488
    3. 6.3 ESD Ratings: LM3488-Q1
    4. 6.4 Recommended Operating Conditions
    5. 6.5 Thermal Information
    6. 6.6 Electrical Characteristics
    7. 6.7 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 Slope Compensation Ramp
      2. 7.3.2 Frequency Adjust/Synchronization/Shutdown
      3. 7.3.3 Short-Circuit Protection
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Boost Converter
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Custom Design with WEBENCH Tools
          2. 8.2.1.2.2 Power Inductor Selection
          3. 8.2.1.2.3 Programming the Output Voltage
          4. 8.2.1.2.4 Setting the Current Limit
          5. 8.2.1.2.5 Current Limit with External Slope Compensation
          6. 8.2.1.2.6 Power Diode Selection
          7. 8.2.1.2.7 Power MOSFET Selection
          8. 8.2.1.2.8 Input Capacitor Selection
          9. 8.2.1.2.9 Output Capacitor Selection
        3. 8.2.1.3 Application Curve
      2. 8.2.2 Designing SEPIC Using LM3488
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1 Power MOSFET Selection
          2. 8.2.2.2.2 Power Diode Selection
          3. 8.2.2.2.3 Selection Of Inductors L1 and L2
          4. 8.2.2.2.4 Sense Resistor Selection
          5. 8.2.2.2.5 SEPIC Capacitor Selection
          6. 8.2.2.2.6 Input Capacitor Selection
          7. 8.2.2.2.7 Output Capacitor Selection
  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 Custom Design with WEBENCH Tools
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Related Links
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 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

8-Pin DGK
VSSOP Package
Top View
LM3488 LM3488-Q1 LM3488_Controller_pinout.png

Pin Functions

PIN TYPE DESCRIPTION
NAME NO.
ISEN 1 I Current sense input pin. Voltage generated across an external sense resistor is fed into this pin.
COMP 2 A Compensation pin. A resistor, capacitor combination connected to this pin provides compensation for the control loop.
FB 3 I Feedback pin. The output voltage should be adjusted using a resistor divider to provide 1.26 V at this pin.
AGND 4 P Analog ground pin.
PGND 5 P Power ground pin.
DR 6 O Drive pin of the IC. The gate of the external MOSFET should be connected to this pin.
FA/SYNC/SD 7 A Frequency adjust, synchronization, and Shutdown pin. A resistor connected to this pin sets the oscillator frequency. An external clock signal at this pin will synchronize the controller to the frequency of the clock. A high level on this pin for ≥ 30 µs will turn the device off. The device will then draw less than 10µA from the supply.
VIN 8 P Power supply input pin.