LM22670-Q1

ACTIVE

3A SIMPLE SWITCHER, Step-Down Voltage Regulator with Synchronization or Adjustable Switching Freq

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Product details

Parameters

Vin (Min) (V) 4.5 Vin (Max) (V) 42 Vout (Min) (V) 1.285 Vout (Max) (V) 37 Iout (Max) (A) 3 Iq (Typ) (mA) 3.4 Switching frequency (Min) (kHz) 200 Switching frequency (Max) (kHz) 1000 Features Enable, Frequency Synchronization, Over Current Protection, Soft Start Fixed Operating temperature range (C) -40 to 125 Rating Automotive Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

HSOIC (DDA) 8 19 mm² 4.9 x 3.9 TO-263 (NDR) 7 100 mm² 10.16 x 9.85 open-in-new Find other Buck converters (integrated switch)

Features

  • Wide Input Voltage Range: 4.5 V to 42 V
  • Internally Compensated Voltage Mode Control
  • Stable with Low ESR Ceramic Capacitors
  • 120 mΩ N-channel MOSFET PFM Package
  • 100 mΩ N-channel MOSFET SO PowerPAD-8 Package
  • Output Voltage Options:
    -ADJ (Outputs as Low as 1.285 V)
    -5.0 (Output Fixed to 5 V)
  • ±1.5% Feedback Reference Accuracy
  • 500 kHz Default Switching Frequency
  • Adjustable Switching Frequency and Synchronization
  • –40°C to 125°C Operating Junction
    Temperature Range
  • Precision Enable Pin
  • Integrated Boot-Strap Diode
  • Integrated Soft-Start
  • Fully WEBENCH® enabled
  • LM22670-Q1 is an Automotive Grade Product
    that is AEC-Q100 Grade 1 Qualified (–40°C to +125°C
    Operating Junction Temperature)
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Description

The LM22670 switching regulator provides all of the functions necessary to implement an efficient high voltage step-down (buck) regulator using a minimum of external components. This easy to use regulator incorporates a 42 V N-channel MOSFET switch capable of providing up to 3 A of load current. Excellent line and load regulation along with high efficiency (> 90%) are featured. Voltage mode control offers short minimum on-time, allowing the widest ratio between input and output voltages. Internal loop compensation means that the user is free from the tedious task of calculating the loop compensation components. Fixed 5 V output and adjustable output voltage options are available. The default switching frequency is set at 500 kHz allowing for small external components and good transient response. In addition, the frequency can be adjusted over a range of 200 kHz to 1 MHz with a single external resistor. The internal oscillator can be synchronized to a system clock or to the oscillator of another regulator. A precision enable input allows simplification of regulator control and system power sequencing. In shutdown mode the regulator draws only 25 µA (typ). Built in soft-start (500 µs, typ) saves external components. The LM22670 device also has built-in thermal shutdown, and current limiting to protect against accidental overloads.

The LM22670 device is a member of Texas Instruments’ SIMPLE SWITCHER® family. The SIMPLE SWITCHER® concept provides for an easy to use complete design using a minimum number of external components and the TI WEBENCH® design tool. TI's WEBENCH® tool includes features such as external component calculation, electrical simulation, thermal simulation, and build-It boards for easy design-in.

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Technical documentation

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$25.00
Description

The LM22670 evaluation board is designed to demonstrate the capabilities of the LM22670 switching regulator. The LM22670 evaluation board is configured to provide an output voltage of 3.3V up to 3A load current with an input voltage range of 4.5V to 42V. Due to the low RDS(ON) of the integrated (...)

EVALUATION BOARDS Download
document-generic User guide
$25.00
Description

The LM22670 inverting evaluation board is designed to demonstrate the capabilities of the LM22670 switching regulator in a polarity inverting topology. The LM22670 inverting evaluation board is configured to provide an output of minus 5V (-5V) up to 1.5A load current with an input voltage range of (...)

Features
  • Input Range: 5.5V to 35V, 12V nominal
  • Output Voltage: -5V
  • Output Current Range: 0A to 1.5A
  • Frequency of Operation: 500 kHz
  • Board Size: 1.5 X 1.5 inches
  • Package: PSOP-8

 

Design tools & simulation

SIMULATION MODELS Download
SNVM338.ZIP (131 KB) - PSpice Model
SIMULATION MODELS Download
SNVM812.ZIP (4 KB) - PSpice Model
CALCULATION TOOLS Download

CAD/CAE symbols

Package Pins Download
SO PowerPAD (DDA) 8 View options
TO-263 (NDR) 7 View options

Ordering & quality

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