SNVS523G September   2007  – January 2018 LM3103

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Typical Application Schematic
  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 Functional Block Diagram
    2. 7.2 Feature Description
      1. 7.2.1  COT Control Circuit Overview
      2. 7.2.2  Startup Regulator (VCC)
      3. 7.2.3  Regulation Comparator
      4. 7.2.4  Zero Coil Current Detect
      5. 7.2.5  Over-Voltage Comparator
      6. 7.2.6  ON-Time Timer, Shutdown
      7. 7.2.7  Current Limit
      8. 7.2.8  N-Channel MOSFET and Driver
      9. 7.2.9  Soft-Start
      10. 7.2.10 Thermal Protection
  8. 8 Applications and Implementation
    1. 8.1 Application Information
      1. 8.1.1 External Components
  9. 9 Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Community Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  10. 10Mechanical, Packaging, and Orderable Information

Package Options

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

5 Pin Configuration and Functions

PWP Package
16-Pin HTSSOP
Top View
LM3103 30029702.png

Pin Functions

PinNameDescriptionApplication Information
1, 2 VIN Input supply voltage Supply pin to the device. Nominal input range is 4.5 V to 42 V.
3, 4 SW Switch Node Internally connected to the source of the main MOSFET and the drain of the synchronous MOSFET. Connect to the output inductor.
5 BST Connection for bootstrap capacitor Connect a 33 nF capacitor from the SW pin to this pin. This capacitor is charged through an internal diode during the main MOSFET off-time.
6 AGND Analog Ground Ground for all internal circuitry other than the PGND pin.
7 SS Soft-start A 70 µA internal current source charges an external capacitor of larger than 22 nF to provide the soft-start function.
8 NC No Connection This pin should be left unconnected.
9, 10 GND Ground Must be connected to the AGND pin for normal operation. The GND and AGND pins are not internally connected.
11 FB Feedback Internally connected to the regulation and over-voltage comparators. The regulation setting is 0.6 V at this pin. Connect to feedback resistors.
12 EN Enable pin Internal pull-up. Connect to a voltage higher than 1.6 V to enable the device.
13 RON On-time Control An external resistor from the VIN pin to this pin sets the main MOSFET on-time.
14 VCC Startup regulator Output Nominally regulated to 6 V. Connect a capacitor of larger than 1 µF between the VCC and AGND pins for stable operation.
15, 16 PGND Power Ground Synchronous MOSFET source connection. Tie to a ground plane.
DAP EP Exposed Pad Thermal connection pad. Connect to the ground plane.