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

6.5 Electrical Characteristics

Specifications with standard type are for TJ = 25°C unless otherwise specified. Minimum and Maximum limits are specified through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless otherwise stated the following conditions apply: VIN = 18 V, VOUT = 3.3 V.
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
START-UP REGULATOR, VCC
VCC VCC output voltage CVCC = 1 µF, no load TJ = –40°C to +125°C 5.6 6.0 6.2 V
VIN – VCC VIN – VCC dropout voltage ICC = 2 mA TJ = –40°C to +125°C 55 150 mV
ICC = 10 mA TJ = –40°C to +125°C 235 500
VCC-UVLO VCC undervoltage lockout threshold (UVLO) VIN increasing TJ = –40°C to +125°C 3.5 3.7 4.1 V
VCC-UVLO-HYS VCC UVLO hysteresis VIN decreasing 275 mV
IIN IIN operating current No switching, VFB = 1 V TJ = –40°C to +125°C 1.0 1.25 mA
IIN-SD IIN operating current, device shutdown VEN = 0 V TJ = –40°C to +125°C 20 40 µA
IVCC VCC current limit VCC = 0 V TJ = –40°C to +125°C 20 33 42 mA
SWITCHING CHARACTERISTICS
RDS-UP-ON Main MOSFET RDS(on) TJ = –40°C to +125°C 0.370 0.7 Ω
RDS- DN-ON Syn. MOSFET RDS(on) TJ = –40°C to +125°C 0.220 0.4 Ω
SOFT-START
ISS SS pin source current VSS = 0 V TJ = –40°C to +125°C 45 70 95 µA
CURRENT LIMIT
ICL Syn. MOSFET current limit threshold 0.9 A
ON/OFF TIMER
ton ON timer pulse width VIN = 10 V, RON = 33 kΩ 0.350 µs
VIN = 18 V, RON = 33 kΩ 0.170
ton-MIN ON timer minimum pulse width 100 ns
toff OFF timer pulse width 240 ns
ENABLE INPUT
VEN EN Pin input threshold VEN rising TJ = –40°C to +125°C 1.6 1.85 V
VEN-HYS Enable threshold hysteresis VEN falling 230 mV
IEN Enable Pull-up Current VEN = 0 V 1 µA
REGULATION AND OVERVOLTAGE COMPARATOR
VFB In-regulation feedback voltage TJ = –40°C to +125°C 0.588 0.6 0.612 V
VFB-OV Feedback overvoltage threshold TJ = –40°C to +125°C 0.655 0.680 0.705 V
IFB 1 nA
THERMAL SHUTDOWN
TSD Thermal shutdown temperature TJ rising 165 °C
TSD-HYS Thermal shutdown temperature hysteresis TJ falling 20 °C