SNVS008L September   1998  – June 2016 LM2671

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 - 3.3 V
    6. 7.6  Electrical Characteristics - 5 V
    7. 7.7  Electrical Characteristics - 12 V
    8. 7.8  Electrical Characteristics - Adjustable
    9. 7.9  Electrical Characteristics - All Output Voltage Versions
    10. 7.10 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 Switch Output
      2. 8.3.2 Input
      3. 8.3.3 C Boost
      4. 8.3.4 Ground
      5. 8.3.5 Sync
      6. 8.3.6 Feedback
      7. 8.3.7 ON/OFF
    4. 8.4 Device Functional Modes
      1. 8.4.1 Shutdown Mode
      2. 8.4.2 Active Mode
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Fixed Output Voltage Version
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Inductor Selection (L1)
          2. 9.2.1.2.2 Output Capacitor Selection (COUT)
          3. 9.2.1.2.3 Catch Diode Selection (D1)
          4. 9.2.1.2.4 Input Capacitor (CIN)
          5. 9.2.1.2.5 Boost Capacitor (CB)
          6. 9.2.1.2.6 Soft-Start Capacitor (CSS) - Optional
          7. 9.2.1.2.7 Frequency Synchronization (optional)
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Adjustable Output Voltage Version
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
          1. 9.2.2.2.1 Programming Output Voltage
          2. 9.2.2.2.2 Inductor Selection (L1)
          3. 9.2.2.2.3 Output Capacitor Selection (COUT)
          4. 9.2.2.2.4 Catch Diode Selection (D1)
          5. 9.2.2.2.5 Input Capacitor (CIN)
          6. 9.2.2.2.6 Boost Capacitor (CB)
        3. 9.2.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Examples
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information
    1. 13.1 DAP (WSON Package)

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

7 Specifications

7.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)(2)
MIN MAX UNIT
Supply voltage 45 V
ON/OFF pin voltage, VSH −0.1 6 V
Switch voltage to ground –1 V
Boost pin voltage VSW + 8 V
Feedback pin voltage, VFB −0.3 14 V
Power dissipation Internally Limited
Lead temperature D package Vapor phase (60 s) 215 °C
Infrared (15 s) 220
P package (soldering, 10 s) 260
WSON package See AN-1187
Maximum junction temperature 150 °C
Storage temperature, Tstg −65 150 °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) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and specifications.

7.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1)(2) ±2000 V
(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.

7.3 Recommended Operating Conditions

MIN MAX UNIT
Supply voltage 6.5 40 V
Junction temperature, TJ –40 125 °C

7.4 Thermal Information

THERMAL METRIC(1) LM2674 UNIT
D (SOIC) P (PDIP) NHN (WSON)
8 PINS 8 PINS 16 PINS
RθJA Junction-to-ambient thermal resistance(2) 105 95 — °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report.
(2) Junction to ambient thermal resistance with approximately 1 square inch of printed-circuit board copper surrounding the leads. Additional copper area lowers thermal resistance further. The value RθJA for the WSON (NHN) package is specifically dependent on PCB trace area, trace material, and the number of layers and thermal vias. For improved thermal resistance and power dissipation for the WSON package, see AN-1187 Leadless Leadframe Package (LLP).

7.5 Electrical Characteristics – 3.3 V

Specifications are for TJ = 25°C (unless otherwise noted).
PARAMETER TEST CONDITIONS MIN(3) TYP(2) MAX(3) UNIT
SYSTEM PARAMETERS(1)
VOUT Output voltage VIN = 8 V to 40 V,
ILOAD = 20 mA to 500 mA		 TJ = 25°C 3.251 3.3 3.35 V
Over full operating temperature range 3.201 3.399
VIN = 6.5 V to 40 V,
ILOAD = 20 mA to 250 mA		 TJ = 25°C 3.251 3.3 3.35 V
Over full operating temperature range 3.201 3.399
η Efficiency VIN = 12 V, ILOAD = 500 mA 86%
(1) External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator performance. When the LM2671 is used as shown in Figure 15 and Figure 21 test circuits, system performance is as specified by the system parameters section of the Electrical Characteristics.
(2) Typical numbers are at 25°C and represent the most likely norm.
(3) All room temperature limits are 100% production tested. All limits at temperature extremes are ensured through correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).

7.6 Electrical Characteristics – 5 V

Specifications are for TJ = 25°C (unless otherwise noted).
PARAMETER TEST CONDITIONS MIN(3) TYP(2) MAX(3) UNIT
SYSTEM PARAMETERS(1)
VOUT Output voltage VIN = 8 V to 40 V,
ILOAD = 20 mA to 500 mA		 TJ = 25°C 4.925 5 5.075 V
Over full operating temperature range 4.85 5.15
VIN = 6.5 V to 40 V,
ILOAD = 20 mA to 250 mA		 TJ = 25°C 4.925 5 5.075 V
Over full operating temperature range 4.85 5.15
η Efficiency VIN = 12 V, ILOAD = 500 mA 90%
(1) External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator performance. When the LM2671 is used as shown in Figure 15 and Figure 21 test circuits, system performance is as specified by the system parameters section of the Electrical Characteristics.
(2) Typical numbers are at 25°C and represent the most likely norm.
(3) All room temperature limits are 100% production tested. All limits at temperature extremes are ensured through correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).

7.7 Electrical Characteristics – 12 V

Specifications are for TJ = 25°C (unless otherwise noted).
PARAMETER TEST CONDITIONS MIN(3) TYP(2) MAX(3) UNIT
SYSTEM PARAMETERS(1)
VOUT Output voltage VIN = 15 V to 40 V,
ILOAD = 20 mA to 500 mA		 TJ = 25°C 11.82 12 12.18 V
Over full operating temperature range 11.64 12.36
η Efficiency VIN = 24 V, ILOAD = 500 mA 94%
(1) External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator performance. When the LM2671 is used as shown in Figure 15 and Figure 21 test circuits, system performance is as specified by the system parameters section of the Electrical Characteristics.
(2) Typical numbers are at 25°C and represent the most likely norm.
(3) All room temperature limits are 100% production tested. All limits at temperature extremes are ensured through correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).

7.8 Electrical Characteristics – Adjustable

Specifications are for TJ = 25°C (unless otherwise noted).
PARAMETER TEST CONDITIONS MIN(3) TYP(2) MAX(3) UNIT
SYSTEM PARAMETERS(1)
VFB Feedback voltage VIN = 8 V to 40 V,
ILOAD = 20 mA to 500 mA
VOUT programmed for 5 V		 TJ = 25°C 1.192 1.21 1.228 V
Over full operating temperature range 1.174 1.246
VIN = 6.5 V to 40 V,
ILOAD = 20 mA to 250 mA
VOUT programmed for 5 V		 TJ = 25°C 1.192 1.21 1.228 V
Over full operating temperature range 1.174 1.246
η Efficiency VIN = 12 V, ILOAD = 500 mA 90%
(1) External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator performance. When the LM2671 is used as shown in Figure 15 and Figure 21 test circuits, system performance is as specified by the system parameters section of the Electrical Characteristics.
(2) Typical numbers are at 25°C and represent the most likely norm.
(3) All room temperature limits are 100% production tested. All limits at temperature extremes are ensured through correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).

7.9 Electrical Characteristics – All Output Voltage Versions

Specifications are for TJ = 25°C, VIN = 12 V for the 3.3-V, 5-V, and Adjustable versions and VIN = 24 V for the 12-V version, and ILOAD = 100 mA (unless otherwise noted).
PARAMETERS TEST CONDITIONS MIN TYP MAX UNIT
DEVICE PARAMETERS
IQ Quiescent current VFEEDBACK = 8 V
for 3.3-V, 5-V, and adjustable versions		 2.5 3.6 mA
VFEEDBACK = 15 V
for 12-V versions		 2.5
ISTBY Standby quiescent current ON/OFF pin = 0 V TJ = 25°C 50 100 μA
Over full operating temperature range 150
ICL Current limit TJ = 25°C 0.62 0.8 1.2 A
Over full operating temperature range 0.575 1.25
IL Output leakage current VIN = 40 V, ON/OFF pin = 0 V
VSWITCH = 0 V		 1 25 μA
VSWITCH = −1 V, ON/OFF pin = 0 V 6 15 mA
RDS(ON) Switch ON-resistance ISWITCH = 500 mA TJ = 25°C 0.25 0.4 Ω
Over full operating temperature range 0.6
fO Oscillator frequency Measured at switch pin TJ = 25°C 260 kHz
Over full operating temperature range 225 275
D Maximum duty cycle 95%
Minimum duty cycle 0%
IBIAS Feedback bias current VFEEDBACK = 1.3 V (adjustable version only) 85 nA
VS/D ON/OFF pin voltage thresholds TJ = 25°C 1.4 V
Over full operating temperature range 0.8 2
IS/D ON/OFF pin current ON/OFF pin = 0 V TJ = 25°C 20 μA
Over full operating temperature range 7 37
FSYNC Synchronization frequency VSYNC = 3.5 V, 50% duty cycle 400 kHz
VSYNC Synchronization threshold voltage 1.4 V
VSS Soft-start voltage TJ = 25°C 0.63 V
Over full operating temperature range 0.53 0.73
ISS Soft-start current TJ = 25°C 4.5 μA
Over full operating temperature range 1.5 6.9

7.10 Typical Characteristics

LM2671 10004203.png Figure 1. Normalized Output Voltage
LM2671 10004205.png Figure 3. Efficiency
LM2671 10004207.png Figure 5. Switch Current Limit
LM2671 10004209.png Figure 7. Standby Quiescent Current
LM2671 10004211.png Figure 9. ON/OFF Pin Current (Sourcing)
LM2671 10004213.png Figure 11. Feedback Pin Bias Current
LM2671 10004215.png Figure 13. Dropout Voltage – 3.3-V Option
LM2671 10004204.png Figure 2. Line Regulation
LM2671 10004206.png Figure 4. Drain-to-Source Resistance
LM2671 10004208.png Figure 6. Operating Quiescent Current
LM2671 10004210.png Figure 8. ON/OFF Threshold Voltage
LM2671 10004212.png Figure 10. Switching Frequency
LM2671 10004214.png Figure 12. Peak Switch Current
LM2671 10004216.png Figure 14. Dropout Voltage – 5-V Option
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