SNVS520F August   2008  – November 2016 LM3686

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (Continued)
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics: Linear Regulator - LILO
    6. 7.6 Electrical Characteristics: Linear Regulator - LDO
    7. 7.7 Electrical Characteristics: DC-DC Converter
    8. 7.8 Electrical Characteristics: Global Parameters (DCDC, LILO, and LDO)
    9. 7.9 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 DC-DC Converter Operation
        1. 8.3.1.1 PWM Operation
        2. 8.3.1.2 PFM Operation
        3. 8.3.1.3 Internal Synchronous Rectification
        4. 8.3.1.4 Current Limiting
        5. 8.3.1.5 Soft Start
      2. 8.3.2 Linear Regulator Operation (LILO)
        1. 8.3.2.1 Start-up Mode
      3. 8.3.3 Current Limiting (LDO and LILO)
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Application Selection
        2. 9.2.2.2 Inductor Selection
          1. 9.2.2.2.1 Method 1
          2. 9.2.2.2.2 Method 2
        3. 9.2.2.3 External Capacitors
        4. 9.2.2.4 Input Capacitor Selection
          1. 9.2.2.4.1 CIN_DC-DC
          2. 9.2.2.4.2 CIN_LILO
          3. 9.2.2.4.3 CIN_LDO
        5. 9.2.2.5 Output Capacitor
          1. 9.2.2.5.1 COUT_DCDC
          2. 9.2.2.5.2 COUT_LILO
          3. 9.2.2.5.3 COUT_LDO
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 DSBGA Package Assembly and Use
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 Related Documentation
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Community Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

6 Pin Configuration and Functions

YZR Package
12-Pin DSBGA
Top View
LM3686 connect_top_snvs520.gif
YZR Package
12-Pin DSBGA
Bottom View
LM3686 connect_bottom_snvs520.gif

Pin Functions

PIN TYPE DESCRIPTION
NO. NAME
A1 PGND Ground Power ground pin
A2 SW Analog Switching node connection to the internal PFET switch and NFET synchronous rectifier.
A3 FB_DCDC Input Feedback analog input for the DC-DC converter. Connect to the output filter capacitor.
B1 VBATT Power Power supply input for switcher. Connect to the input filter capacitor.
B2 EN_LILO Input Enable input for the linear regulator. The linear regulator is in shutdown mode if voltage at this pin is
< 0.4 V and enabled if > 1.1 V. Do not leave this pin floating.
B3 EN_DCDC Input Enable input for the DC-DC converter. The DC-DC converter is in shutdown mode if voltage at this pin is < 0.4 V and enabled if > 1.1 V. Do not leave this pin floating.
C1 VIN_LDO Input Input power to LDO — must tie to VBATT at all times.
C2 EN_LDO Input Enable input for the linear regulator. The linear regulator is in shutdown mode if voltage at this pin is
< 0.4 V and enabled if > 1.1 V. Do not leave this pin floating.
C3 QGND Ground Quiet GND pin for LDO and reference circuit
D1 VOUT_LDO Output Voltage output of the linear regulator
D2 VOUT_LILO Output Voltage output of the low input linear regulator
D3 VIN_LILO Input Input power to LILO (VIN_LILO) connects to output of DCDC or standalone.