SNVSAQ4C December   2017  – March 2023 LMZM23601

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
    1.     Device Comparison
  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 System 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 Control Scheme
      2. 7.3.2 Soft-Start Function
      3. 7.3.3 Enable and External UVLO Function
      4. 7.3.4 Current Limit
      5. 7.3.5 Hiccup Mode
      6. 7.3.6 Power Good (PGOOD) Function
      7. 7.3.7 MODE/SYNC Function
        1. 7.3.7.1 Forced PWM Mode
        2. 7.3.7.2 Auto PFM Mode
        3. 7.3.7.3 Dropout Mode
        4. 7.3.7.4 SYNC Operation
      8. 7.3.8 Thermal Protection
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown
      2. 7.4.2 FPWM Operation
      3. 7.4.3 Auto PFM Mode Operation
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Design Requirements
        1. 8.2.1.1 Maximum Input Voltage for VOUT < 2.5 V
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Custom Design With WEBENCH® Tools
        2. 8.2.2.2 Input Capacitor Selection
        3. 8.2.2.3 Output Capacitor Selection
        4. 8.2.2.4 Feedback Voltage Divider for Adjustable Output Voltage Versions
        5. 8.2.2.5 RPU - PGOOD Pullup Resistor
        6. 8.2.2.6 VIN Divider and Enable
      3. 8.2.3 Application Curves
        1. 8.2.3.1 VOUT = 5 V
        2. 8.2.3.2 VOUT = 3.3 V
        3. 8.2.3.3 VOUT = 12 V
        4. 8.2.3.4 VOUT = 15 V
        5. 8.2.3.5 VOUT = 2.5 V
        6. 8.2.3.6 VOUT = 1.2 V and VOUT = 1.8 V
        7. 8.2.3.7 VOUT = 5 V and 3.3 V Fixed Output Options
    3. 8.3 Best Design Practices
    4. 8.4 Power Supply Recommendations
      1. 8.4.1 Supply Voltage Range
      2. 8.4.2 Supply Current Capability
      3. 8.4.3 Supply Input Connections
        1. 8.4.3.1 Voltage Drops
        2. 8.4.3.2 Stability
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
        1. 8.5.1.1 Thermal Design
      2. 8.5.2 Layout Examples
  9. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Third-Party Products Disclaimer
      2. 9.1.2 Development Support
        1. 9.1.2.1 Custom Design With WEBENCH® Tools
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  10. 10Mechanical, Packaging, and Orderable Information
    1. 10.1 Tape and Reel Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • SIL|10
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.3.3 Enable and External UVLO Function

Some applications can require a precision enable or custom input voltage lockout (UVLO) functionality. Setting up external UVLO based on the application needs prevents the converter from trying to regulate the output voltage until after the input voltage has reached a desired minimum level. Such function can be used to lower the current demand from the input supply as the supply is still starting up.

The LMZM23601 features a precision enable (EN) input terminal. The EN input logic has two internal thresholds. The first rising threshold is at 0.9V typical. Its purpose is to wake up the internal VCC regulator to bias the internal circuitry. The EN rising threshold to start switching is 1.8V (typical) with 0.5V (typical) hysteresis. A voltage divider from VIN to EN can be used to set the VIN voltage at which the regulator starts the voltage conversion. The EN terminal is rated for up to the input voltage and can be connected directly to VIN for an always-on operation. Pulling the EN pin below 0.4 V puts the LMZM23601 in shutdown mode. In shutdown mode and 12-V input voltage the LMZM23601 only consumes 1.8 µA (typical) of input current.