SNVS712H February   2010  – August 2015 LMZ22008

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 Synchronization Input
      2. 7.3.2 Current Sharing
      3. 7.3.3 Output Overvoltage Protection
      4. 7.3.4 Current Limit
      5. 7.3.5 Thermal Protection
      6. 7.3.6 Prebiased Start-Up
    4. 7.4 Device Functional Modes
      1. 7.4.1 Discontinuous Conduction and Continuous Conduction Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Design Steps
        2. 8.2.2.2 Enable Divider, RENT, RENB and RENH Selection
        3. 8.2.2.3 Output Voltage Selection
        4. 8.2.2.4 Soft-Start Capacitor Selection
        5. 8.2.2.5 Tracking Supply Divider Option
        6. 8.2.2.6 COUT Selection
        7. 8.2.2.7 CIN Selection
        8. 8.2.2.8 Discontinuous Conduction and Continuous Conduction Modes Selection
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
    3. 10.3 Power Dissipation and Thermal Considerations
    4. 10.4 Power Module SMT Guidelines
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
      2. 11.1.2 Development Support
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    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)
Orderable Information

5 Pin Configuration and Functions

NDY Package
11-Pin
Top View
LMZ22008 30151206.gif

Pin Functions

PIN TYPE DESCRIPTION
NAME NO.
AGND 5 Ground Analog Ground — Reference point for all stated voltages. Must be externally connected to PGND(EP).
6
EN 4 Analog Enable — Input to the precision enable comparator. Rising threshold is 1.274 V typical. Once the module is enabled, a 13-µA source current is internally activated to facilitate programmable hysteresis.
FB 7 Analog Feedback — Internally connected to the regulation amplifier and overvoltage comparator. The regulation reference point is 0.795 V at this input pin. Connect the feedback resistor divider between VOUT and AGND to set the output voltage.
PGND — Ground Exposed Pad / Power Ground — Electrical path for the power circuits within the module. PGND is not internally connected to AGND (pin 5,6). Must be electrically connected to pins 5 and 6 external to the package. The exposed pad is also used to dissipate heat from the package during operation. Use one hundred thermal vias from top to bottom copper for best thermal performance.
SH 9 Analog Share — Connect this pin to the share pin of other LMZ22008 modules to share the load between the devices. One device should be configured as the master by connecting FB normally. All other devices should be configured as slaves by leaving their respective FB pins floating. Leave SH floating if current sharing is not used. Do Not Ground. See Design Steps for the LMZ22008 Application section.
SS 8 Analog Soft-Start/Track Input — To extend the 1.6 ms internal soft-start connect an external soft-start capacitor. For tracking connect to an external resistive divider connected to a higher priority supply rail. See Design Steps for the LMZ22008 Application section.
SYNC 3 Analog Synchronization — Apply a CMOS logic level square wave whose frequency is between 314 kHz and 600 kHz to synchronize the PWM operating frequency to an external frequency source. When not using synchronization this pin must be tied to ground. The module free-running PWM frequency is 359 kHz (typical).
VIN 1 Power Input supply — Nominal operating range is 6 V to 20 V. A small amount of internal capacitance is contained within the package assembly. Additional external input capacitance is required between this pin and the exposed pad (PGND).
2
VOUT 10 Power Output Voltage — Output from the internal inductor. Connect the output capacitor between this pin and exposed pad (PGND).
11