LM2675 SIMPLE SWITCHER® 6.5V to 40V, 1A Low Component Count Step-Down Regulator | TI.com

LM2675
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SIMPLE SWITCHER® 6.5V to 40V, 1A Low Component Count Step-Down Regulator

 

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Description

The LM2675 series of regulators are monolithic integrated DC-DC converter circuits built with a LMDMOS process. These regulators provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1-A load current with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, and an adjustable output version.

Requiring a minimum number of external components, these regulators are simple to use and include patented internal frequency compensation and a fixed frequency oscillator.

The LM2675 series operates at a switching frequency of 260 kHz, thus allowing smaller-sized filter components than what would be needed with lower frequency switching regulators. Because of its very high efficiency (>90%), the copper traces on the printed-circuit board are the only heat sinking needed.

A family of standard inductors for use with the LM2675 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies using these advanced ICs. Also included in the data sheet are selector guides for diodes and capacitors designed to work in switch-mode power supplies.

Other features include ±1.5%-tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring typically 50-µA standby current. The output switch includes current limiting, as well as thermal shutdown for full protection under fault conditions.

Features

  • Efficiency up to 96%
  • Available in 8-Pin SOIC, PDIP, and 16-Pin WSON
    Package
  • Requires only 5 External Components
  • 3.3-V, 5-V, 12-V, and Adjustable Output Versions
  • Adjustable Version Output Voltage Range: 1.21 V
    to 37 V
  • ±1.5% Maximum Output Voltage Tolerance Over
    Line and Load Conditions
  • Ensured 1-A Output Load Current
  • Wide Input Voltage Range: 8 V to 40 V
  • 260-kHz Fixed Frequency Internal Oscillator
  • TTL Shutdown Capability, Low-Power Standby
    Mode
  • Thermal Shutdown and Current Limit Protection

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WEBENCH® Designer LM2675

  Min   Max Range
Vin  V 6.5 to 40.0V
Vout  V 1.21 to 40V
Iout  A ≤ 1A
Ambient Temp  °C -40 to 125°C

Parametrics

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Part number Order Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Iout (Max) (A) Regulated outputs (#) Switching frequency (Min) (kHz) Switching frequency (Max) (kHz) Iq (Typ) (mA) Features Control mode Duty cycle (Max) (%) Operating temperature range (C) Rating Package Group Type Package size: mm2:W x L (PKG)
LM2675 Order now 6.5     40     1.23     37     1     1     260     260     2.5     Enable
Over Current Protection    
Voltage Mode     95     -40 to 125     Catalog     PDIP | 8
SOIC | 8
WSON | 16    
Converter     8PDIP: 93 mm2: 9.43 x 9.81 (PDIP | 8)
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
16WSON: 25 mm2: 5 x 5 (WSON | 16)    
LM2670 Order now 6.5     40     1.23     37     3     1     260     400     4.2     Frequency Synchronization
Over Current Protection    
Voltage Mode     91     -40 to 125     Catalog     DDPAK/TO-263 | 7
TO-220 | 7
VSON | 14    
Converter     7DDPAK/TO-263: 154 mm2: 15.24 x 10.1 (DDPAK/TO-263 | 7)
7TO-220: 83 mm2: 8.13 x 10.16 (TO-220 | 7)
14VSON: 30 mm2: 5 x 6 (VSON | 14)    
LM2671 Order now 6.5     40     1.23     37     0.5     1     225     400     2.5     Enable
Over Current Protection    
Voltage Mode     95     -40 to 125     Catalog     PDIP | 8
SOIC | 8
WSON | 16    
Converter     8PDIP: 93 mm2: 9.43 x 9.81 (PDIP | 8)
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
16WSON: 25 mm2: 5 x 5 (WSON | 16)    
LM2672 Order now 6.5     40     1.23     37     1     1     225     400     2.5     Enable
Over Current Protection    
Voltage Mode     95     -40 to 125     Catalog     PDIP | 8
SOIC | 8
WSON | 16    
Converter     8PDIP: 93 mm2: 9.43 x 9.81 (PDIP | 8)
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
16WSON: 25 mm2: 5 x 5 (WSON | 16)    
LM2673 Order now 8     40     1.23     37     3     1     260