SNVS421H January   2006  – October 2017 LM3100

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and 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 Hysteretic Control Circuit Overview
    4. 7.4 Device Functional Modes
      1. 7.4.1 Start-up Regulator (VCC)
      2. 7.4.2 Regulation Comparator
      3. 7.4.3 Over-Voltage Comparator
      4. 7.4.4 ON-Time Timer, Shutdown
      5. 7.4.5 Current Limit
      6. 7.4.6 N-Channel Buck Switch and Driver
      7. 7.4.7 Soft-Start
      8. 7.4.8 Thermal Protection
  8. 8 Applications and Implementation
    1. 8.1 Applications Information
      1. 8.1.1 External Components
        1. 8.1.1.1 RFB1 and RFB2
        2. 8.1.1.2 RON
        3. 8.1.1.3 L
        4. 8.1.1.4 CVCC
        5. 8.1.1.5 CO and CO3
        6. 8.1.1.6 CIN and CIN3
        7. 8.1.1.7 CBST
        8. 8.1.1.8 CSS
        9. 8.1.1.9 CFB
    2. 8.2 Typical Application
  9. 9 Layout
    1. 9.1 Layout Guidelines
      1. 9.1.1 PC Board Layout
  10. 10Device and Documentation Support
    1. 10.1 Receiving Notification of Documentation Updates
    2. 10.2 Community Resources
    3. 10.3 Trademarks
    4. 10.4 Electrostatic Discharge Caution
    5. 10.5 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

Package Options

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

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)(2)
MIN MAX UNIT
VIN, RON to GND –0.3 40 V
SW to GND –0.3 40 V
SW to GND (Transient) –2 (< 100 ns) V
VIN to SW –0.3 40 V
BST to SW –0.3 7 V
All Other Inputs to GND –0.3 7 V
Junction Temperature, TJ –65 150 °C
Storage temperature, Tstg 150 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications.

6.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1)(2) ±2 kV
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) The human body model is a 100-pF capacitor discharged through a 1.5-kΩ resistor into each pin.

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
Supply Voltage Range VIN 4.5 36 V
Junction Temperature Range TJ –40 125 °C

6.4 Thermal Information

THERMAL METRIC(1) LM3100 UNIT
PWP (HTSSOP)
20 PINS
RθJC Junction-to-case thermal resistance 6.5 °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report.

6.5 Electrical Characteristics

at TJ = 25°C, and VIN = 18 V, VOUT = 3.3 V (unless otherwise noted).(1)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
START-UP REGULATOR, VCC
VCC Output voltage CCC = 680 nF, no load TJ = –40°C to 125°C 5.0 6.0 7.2 V
VIN - VCC Dropout voltage ICC = 2 mA TJ = –40°C to 125°C 50 140 mV
ICC = 20 mA TJ = –40°C to 125°C 350 570
IVCCL Current limit(1) VCC = 0 V TJ = –40°C to 125°C 40 65 mA
VCC-UVLO Under-voltage lockout threshold VIN increasing TJ = –40°C to 125°C 3.6 3.75 3.85 V
VCC-UVLO-HYS UVLO hysteresis VIN decreasing 130 mV
tVCC-UVLO-D UVLO filter delay 3 µs
IIN Operating current No switching, VFB = 1 V TJ = –40°C to 125°C 0.7 1 mA
IIN-SD Operating current, Device shutdown VEN = 0 V TJ = –40°C to 125°C 17 30 µA
SWITCHING CHARACTERISTICS
RDS-UP-ON Main MOSFET Rds(on) TJ = –40°C to 125°C 0.18 0.35 Ω
RDS- DN-ON Syn. MOSFET Rds(on) TJ = –40°C to 125°C 0.11 0.2 Ω
VG-UVLO Gate drive voltage UVLO VBST - VSW increasing TJ = –40°C to 125°C 3.3 4 V
SOFT-START
ISS SS pin source current VSS = 0.5 V TJ = –40°C to 125°C 6 8 9.8 µA
CURRENT LIMIT
ICL Syn. MOSFET current limit threshold 1.9 A
ON/OFF TIMER
tON ON timer pulse width VIN = 10 V, RON = 100 kΩ 1.38 µs
VIN = 30 V, RON = 100 kΩ 0.47
tON-MIN ON timer minimum pulse width 200 ns
tOFF OFF timer pulse width 260 ns
ENABLE INPUT
VEN EN Pin input threshold VEN rising TJ = –40°C to 125°C 1.236 1.26 1.285 V
VEN-HYS Enable threshold hysteresis VEN falling 90 mV
REGULATION and OVER-VOLTAGE COMPARATOR
VFB In-regulation feedback voltage VSS ≥ 0.8 V TJ = –40°C to 125°C 0.784 0.8 0.816 V
VSS ≥ 0.8 V TJ = –40°C to 125°C 0.788 0.812
VFB-OV Feedback over-voltage threshold TJ = –40°C to 125°C 0.894 0.920 0.940 V
IFB TJ = –40°C to 125°C 5 100 nA
THERMAL SHUTDOWN
TSD Thermal shutdown temperature TJ rising 165 °C
TSD-HYS Thermal shutdown temperature hysteresis TJ falling 20 °C
(1) VCC provides self bias for the internal gate drive and control circuits. Device thermal limitations limit external loading.

6.6 Typical Characteristics

All curves taken at VIN = 18 V with configuration in typical application circuit for VOUT = 3.3 V shown in this datasheet. TA = 25°C, unless otherwise specified.
LM3100 20174718.gif
1.
Figure 1. Quiescent Current, IIN vs VIN
LM3100 20174720.gif
1.
Figure 3. VCC vs VIN
LM3100 20174722.gif
1.
Figure 5. Switching Frequency, FSW vs VIN
LM3100 20174724.gif
1.
Figure 7. RDS(ON) vs Temperature
LM3100 20174726.gif
1.
VOUT = 3.3 V
Figure 9. VOUT Regulation vs Load Current
LM3100 20174728.gif
1.
VOUT = 0.8 V
Figure 11. VOUT Regulation vs Load Current
LM3100 20174730.png
1.
VOUT = 3.3 V, 1.5 A Loaded
Figure 13. Enable Transient
LM3100 20174732.png
1.
VOUT = 3.3 V, 1.5 A Loaded
Figure 15. Continuous Mode Operation
LM3100 20174734.png
1.
VOUT = 3.3 V, 0.15 A - 1.5 A Load
Figure 17. CCM to DCM Transition
LM3100 20174719.gif
1.
Figure 2. VCC vs ICC
LM3100 20174721.gif
1.
Figure 4. TON vs VIN
LM3100 20174723.gif
1.
Figure 6. VFB vs Temperature
LM3100 20174725.gif
1.
VOUT = 3.3 V
Figure 8. Efficiency vs Load Current
LM3100 20174727.gif
1.
VOUT = 0.8 V
Figure 10. Efficiency vs Load Current
LM3100 20174729.png
1.
VOUT = 3.3 V, 1.5 A Loaded
Figure 12. Power Up
LM3100 20174731.png
1.
VOUT = 3.3 V, 1.5 A Loaded
Figure 14. Shutdown Transient
LM3100 20174733.png
1.
VOUT = 3.3 V, 0.15 A Loaded
Figure 16. Discontinuous Mode Operation
LM3100 20174735.png
1.
VOUT = 3.3 V, 0.15 A - 1.5 A Load Current slew-rate: 2.5 A/µs
Figure 18. Load Transient