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LM2675M-5.0/NOPB

1A buck regulator, 5.0V fixed, 8-40V input, 96% eff, 260kHz, SOIC-8, -40-125C

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Manufacturer Part：

LM2675M-5.0/NOPB

Package：

SOIC-8 / D (4.90 x 3.90 x 1.58 mm)

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Description

Product Overview

The LM2675M-5.0/NOPB from Texas Instruments is a SIMPLE SWITCHER 1A step-down (buck) voltage regulator with fixed 5.0V output. Operating from 8V to 40V input, it achieves up to 96% efficiency with only 5 external components. The 260 kHz fixed-frequency oscillator enables small inductor size in an 8-pin SOIC package.

Key Specifications

Type 1A Step-Down (Buck) Regulator
Output Voltage 5.0V (fixed)
Output Current 1 A
Input Voltage 8V – 40V
Efficiency Up to 96%
Switching Frequency 260 kHz (fixed)
Output Accuracy +/-1.5% over line and load
Quiescent Current 50 uA (typical)
Standby Current 50 uA (shutdown mode)
External Components 5 (inductor, diode, 2 caps, IC)
Protection Thermal shutdown, current limit
Package SOIC-8 (D)
Operating Temp -40 to 125 C

Features

  • Fixed 5.0V output with +/-1.5% accuracy over line and load
  • 8V to 40V wide input voltage range
  • Up to 96% efficiency for minimal power dissipation
  • Only 5 external components required
  • 260 kHz fixed-frequency oscillator for small inductor size
  • TTL-compatible shutdown with low 50 uA standby current
  • Thermal shutdown and current limit protection
  • Available in 3.3V, 5V, 12V, and adjustable output versions

Applications

  • Automotive 12V/24V to 5V power conversion
  • Industrial distributed power systems
  • Battery-powered 5V systems
  • Embedded 5V logic supply from unregulated source
  • Post-regulation for offline converters

The LM2675M-5.0/NOPB from Texas Instruments is a SIMPLE SWITCHER 1A step-down voltage regulator with a fixed 5.0V output. Operating from 8V to 40V input, it achieves up to 96% efficiency using a DMOS power switch fabricated in TI LMDMOS process. The 260 kHz fixed-frequency PWM operation allows the use of small external inductors and capacitors, minimizing total solution size. The complete regulator requires only 5 external components: input capacitor, output capacitor, bootstrap capacitor, Schottky diode, and inductor. The +/-1.5% output accuracy is maintained over the full input voltage and load current range.

The LM2675M-5.0/NOPB uses a fixed-frequency pulse-width modulation (PWM) control architecture with a 260 kHz internal oscillator. The internal DMOS power switch is driven by the PWM comparator, which adjusts the duty cycle to maintain the 5.0V output. A current-mode control loop provides fast transient response and cycle-by-cycle current limiting. The bootstrap capacitor on the CB pin provides the gate drive voltage for the high-side DMOS switch. The feedback resistors are integrated for the fixed 5.0V output, eliminating external divider components. The ON/OFF pin provides TTL-compatible shutdown; when driven low, the device enters standby mode drawing only 50 uA. Thermal shutdown activates at approximately 165 C junction temperature, and current limiting protects the DMOS switch during overload conditions.

Pin Name Type Function
1 CB I/O Bootstrap capacitor (connect 0.01uF to VOUT)
2 GND Ground Ground
3 ON/OFF Input Shutdown control (HIGH=on, LOW=off)
4 VIN Power Input supply (8-40V)
5 NC – No connect
6 NC – No connect
7 SW Power Switch output (connect to inductor and diode)
8 VOUT Output Regulated 5.0V output
  • Automotive: 12V/24V battery to 5V logic supply with 96% efficiency
  • Industrial: Distributed 24V to 5V power with minimal external components
  • Battery systems: High-efficiency 8-40V to 5V conversion for portable equipment
  • Embedded logic: 5V MCU and peripheral supply from unregulated DC bus
  • Post-regulation: 5V output from offline flyback for clean secondary supply
Manufacturer Part Number Package Notes
TI LM2675M-3.3/NOPB SOIC-8 Fixed 3.3V version, same specs
TI LM2675M-ADJ/NOPB SOIC-8 Adjustable 1.21-37V version
TI LM2679M-5.0/NOPB SOIC-8 3A version, same family
Monolithic Power MP1584EN-LF-Z SOIC-8 3A, 4.5-28V, 1.5MHz, smaller inductor
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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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