SNVS641L January   2010  – April 2019 LMZ10503

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application Circuit
      2.      Efficiency VOUT = 3.3 V
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin 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 Enable
      2. 7.3.2 Enable and UVLO
      3. 7.3.3 Soft-Start
      4. 7.3.4 Soft-Start Capacitor
      5. 7.3.5 Tracking
      6. 7.3.6 Tracking - Equal Soft-Start Time
      7. 7.3.7 Tracking - Equal Slew Rates
      8. 7.3.8 Current Limit
      9. 7.3.9 Overtemperature Protection
    4. 7.4 Device Functional Modes
      1. 7.4.1 Prebias Start-Up Capability
  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 Custom Design With WEBENCH® Tools
        2. 8.2.2.2 Input Capacitor Selection
        3. 8.2.2.3 Output Capacitor Selection
          1. 8.2.2.3.1 Output Voltage Setting
        4. 8.2.2.4 Loop Compensation
      3. 8.2.3 Application Curves
    3. 8.3 System Examples
      1. 8.3.1 Application Schematic for 3.3-V to 5-V Input and 2.5-V Output With Optimized Ripple and Transient Response
      2. 8.3.2 Application Schematic for 3.3-V to 5-V Input and 2.5-V Output
      3. 8.3.3 EMI Tested Schematic for 2.5-V Output Based on 3.3-V to 5-V Input
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
    3. 10.3 Estimate 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
        1. 11.1.2.1 Custom Design With WEBENCH® Tools
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

8.3.2 Application Schematic for 3.3-V to 5-V Input and 2.5-V Output

The compensation for each solution was optimized to work over the full input range. Many applications have a fixed input voltage rail. It is possible to modify the compensation to obtain a faster transient response for a given input voltage operating point.

LMZ10503 30111880.gifFigure 27. Schematic for 2.5-V Output Based on 3.3-V to 5-V Input

Table 7. Bill of Materials for Evaluation Board, VIN = 3.3 V to 5 V, VOUT = 2.5 V, IOUT (MAX) = 3 A

DESIGNATOR DESCRIPTION CASE SIZE MANUFACTURER MANUFACTURER P/N QUANTITY
U1 Power Module PFM-7 Texas Instruments LMZ10503 1
Cin1 1 µF, X7R, 16 V 0805 TDK C2012X7R1C105K 1
Cin2, CO1 4.7 µF, X5R, 6.3 V 0805 TDK C2012X5R0J475K 2
Cin3, CO2 22 µF, X5R, 16 V 1210 TDK C3225X5R1C226M 2
Cin4 47 µF, X5R, 6.3 V 1210 TDK C3225X5R0J476M 1
Cin5 220 µF, 10 V, AL-Elec E Panasonic EEE1AA221AP 1
CO3 100 µF, X5R, 6.3 V 1812 TDK C4532X5R0J107M 1
Rfbt 75 kΩ 0805 Vishay Dale CRCW080575K0FKEA 1
Rfbb 34.8 kΩ 0805 Vishay Dale CRCW080534K8FKEA 1
Rcomp 1.1 kΩ 0805 Vishay Dale CRCW08051K10FKEA 1
Ccomp 180 pF, ±5%, C0G, 50 V 0603 TDK C1608C0G1H181J 1
Ren1 100 kΩ 0805 Vishay Dale CRCW0805100KFKEA 1
CSS 10 nF, ±5%, C0G, 50 V 0805 TDK C2012C0G1H103J 1

Table 8. Output Voltage Setting (Rfbt = 75 kΩ)

VOUT Rfbb
3.3V 23.7 kΩ
2.5 V 34.8 kΩ
1.8 V 59 kΩ
1.5 V 84.5 kΩ
1.2 V 150 kΩ
0.9 V 590 kΩ