SNVSA42B June   2015  – May 2016 LM53602-Q1 , LM53603-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  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
    6. 7.6 System Characteristics
    7. 7.7 Timing Requirements
    8. 7.8 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 RESET Flag Output
      2. 8.3.2 Enable and Start-up
      3. 8.3.3 Current Limit
      4. 8.3.4 Synchronizing Input
      5. 8.3.5 Input Supply Current
      6. 8.3.6 UVLO and TSD
    4. 8.4 Device Functional Modes
      1. 8.4.1 AUTO Mode
      2. 8.4.2 FPWM Mode
      3. 8.4.3 Drop-Out
      4. 8.4.4 Input Voltage Frequency Fold-Back
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Design Parameters
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Setting the Output Voltage
        2. 9.2.2.2 Output Capacitors
        3. 9.2.2.3 Input Capacitors
        4. 9.2.2.4 Inductor
        5. 9.2.2.5 VCC
        6. 9.2.2.6 BIAS
        7. 9.2.2.7 CBOOT
        8. 9.2.2.8 Maximum Ambient Temperature
      3. 9.2.3 Application Curves
      4. 9.2.4 Additional Application Circuit
        1. 9.2.4.1 Design Parameters for Typical Adjustable Output Automotive Power Supply
    3. 9.3 Do's and Don't's
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Ground and Thermal Plane Considerations
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Related Links
    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

6 Pin Configuration and Functions

PWP Package
16-Lead HTSSOP
Top View
LM53602-Q1 LM53603-Q1 connect1.gif

Pin Functions

PIN I/O(1) DESCRIPTION
NAME NO.
SW 1,2 P Regulator switch node. Connect to power inductor. Connect pins 1 and 2 directly together at the PCB.
CBOOT 3 P Bootstrap supply input for gate drivers. Connect a high quality 470 nF capacitor from this pin to SW.
VCC 4 O Internal 3.15 V regulator output. Used as supply to internal control circuits. Do not connect to any external loads. Can be used as logic supply for control inputs. Connect a high quality 3.3 µF capacitor from this pin to GND.
BIAS 5 P Input to internal voltage regulator. Connect to output voltage point. Do not ground. Connect a high quality 0.1 µF capacitor from this pin to GND.
SYNC 6 I Synchronization input to regulator. Used to synchronize the regulator switching frequency to the system clock. When not used connect to GND; do not float.
FPWM 7 I Mode control input to regulator. High = forced PWM (FPWM). Low = auto mode; automatic transition between PFM and PWM. Do not float.
RESET 8 O Open drain reset output. Connect to suitable voltage supply through a current limiting resistor. High = power OK. Low = fault. RESET will go low when EN = low.
FB 9 I Feedback input to regulator. Connect to output voltage sense point for fixed 5 V and 3.3 V output. Connect to feedback divider tap point for ADJ option. Do not float or ground.
AGND 10 G Analog ground for regulator and system. All electrical parameters are measured with respect to this pin. Connect to EP and PGND on PCB.
EN 11 I Enable input to the regulator. High = ON. Low = OFF. Can be connected directly to VIN. Do not float.
VIN 12, 13 P Input supply to the regulator. Connect a high quality bypass capacitor(s) from this pin to PGND. Connect pins 12 and 13 directly together at the PCB.
N/C 14 - This pin has no connection to the device.
PGND 15, 16 G Power ground to internal low side MOSFET. Connect to AGND and system ground. Connect pins 15 and 16 directly together at the PCB.
EP 17 G Exposed die attach paddle. Connect to ground plane for adequate heat sinking and noise reduction.
(1) O = Output, I = Input, G = Ground, P = Power