SNVS077J May   2004  – June 2016 LM2677

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 - 3.3 V
    6. 6.6  Electrical Characteristics - 5 V
    7. 6.7  Electrical Characteristics - 12 V
    8. 6.8  Electrical Characteristics - Adjustable
    9. 6.9  Electrical Characteristics - All Output Voltage Versions
    10. 6.10 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 Switch Output
      2. 7.3.2 CBoost
      3. 7.3.3 Ground
      4. 7.3.4 Sync
      5. 7.3.5 Feedback
      6. 7.3.6 ON/OFF
      7. 7.3.7 DAP (VSON Package)
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Active Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Inductor
      2. 8.1.2 Output Capacitor
      3. 8.1.3 Input and Output Capacitor Codes
      4. 8.1.4 Input Capacitor
      5. 8.1.5 Catch Diode
      6. 8.1.6 Boost Capacitor
      7. 8.1.7 SYNC Components
      8. 8.1.8 Additional Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Fixed Output Voltage Applications
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Adjustable Output Voltage Applications
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 VSON Package Devices
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    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)

5 Pin Configuration and Functions

KTW Package
7-Pin TO-263
Top View
NDZ Package
7-Pin TO-220
Top View
NHM Package
14-Pin VSON
Top View

Pin Functions

PIN I/O DESCRIPTION
NAME TO-263, TO-220 VSON
CB 3 4 I Boot-strap capacitor connection for high-side driver. Connect a high quality
100-nF capacitor from CB to VSW pin.
FB 6 7 I Feedback sense input pin. Connect to the midpoint of feedback divider to set VOUT for ADJ version or connect this pin directly to the output capacitor for a fixed output version.
GND 4 9 — Power ground pins. Connect to system ground. Ground pins of CIN and COUT. Path to CIN must be as short as possible.
NC — 1, 5, 10, 11 — No connect pins
ON/OFF 7 8 I Enable input to the voltage regulator. High = ON and low = OFF. Pull this pin high or float to enable the regulator.
SYNC 5 6 I This input allows control of the switching clock frequency. If left open-circuited the regulator is switched at the internal oscillator frequency, typically
260 kHz.
VIN 2 2, 3 I Supply input pin to collector pin of high side FET. Connect to power supply and input bypass capacitors CIN. Path from VIN pin to high frequency bypass CIN and GND must be as short as possible.
VSW 1 12, 13, 14 O Source pin of the internal High Side FET. This is a switching node. Attached this pin to an inductor and the cathode of the external diode.