LM22678-Q1 5A SIMPLE SWITCHER, Step-Down Voltage Regulator with Precision Enable | TI.com

LM22678-Q1
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5A SIMPLE SWITCHER, Step-Down Voltage Regulator with Precision Enable

 

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Description

The LM22678 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 that can provide up to 5 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. A switching frequency of 500 kHz allows for small external components and good transient response. A precision enable input allows simplification of regulator control and system power sequencing. In shutdown mode the regulator draws only 25 µA (typical). Built-in soft-start (500 µs, typical) saves external components. The LM22678 device also has built-in thermal shutdown, and current limiting to protect against accidental overloads.

The LM22678 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.

Features

  • Wide Input Voltage Range: 4.5 V to 42 V
  • Internally Compensated Voltage Mode Control
  • Stable With Low ESR Ceramic Capacitors
  • 100-mΩ N-Channel MOSFET
  • Output Voltage Options:
    -ADJ (Outputs as Low as 1.285 V)
    -5.0 (Output Fixed to 5 V)
  • ±1.5% Feedback Reference Accuracy
  • Switching Frequency of 500 kHz
  • –40°C to 125°C Operating Junction Temperature
    Range
  • Precision Enable Pin
  • Integrated Boot-Strap Diode
  • Integrated Soft-Start
  • Fully WEBENCH® Enabled
  • LM22678-Q1 is an Automotive-Grade Product
    that is AEC-Q100 Grade 1 Qualified (–40°C to
    +125°C Operating Junction Temperature)
  • PFM (Exposed Pad) Package

New!
WEBENCH® Power Designer is now even easier to use. Try it now.

WEBENCH® Designer LM22678-Q1

  Min   Max Range
Vin  V 4.5 to 42.0V
Vout  V 1.28 to 37V
Iout  A ≤ 5A
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)
LM22678-Q1 Order now 4.5     42     1.285     37     5     1     500     500     3.4     Enable
Over Current Protection    
Voltage Mode     90     -40 to 125     Automotive     TO-263 | 7     Converter     7TO-263: 100 mm2: 9.85 x 10.16 (TO-263 | 7)    
LM22671-Q1 Samples not available 4.5     42     1.285     37     0.5     1     200     1000     3.4     Enable
Frequency Synchronization
Over Current Protection    
Voltage Mode     90     -40 to 125     Automotive     SO PowerPAD | 8     Converter     8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)    
LM22673-Q1 Order now 4.5     42     1.285     37     3     1     500     500     3.4     Adjustable Current Limit
Enable
Over Current Protection    
Voltage Mode     90     -40 to 125     Automotive     SO PowerPAD | 8
TO-263 | 7    
Converter     8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)
7TO-263: 100 mm2: 9.85 x 10.16 (TO-263 | 7)    
LM22674-Q1 Samples not available 4.5     42     1.285     37     0.5     1     500     500     3.4     Enable
Over Current Protection    
Voltage Mode     90     -40 to 125     Automotive     SO PowerPAD | 8     Converter     8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)    
LM22675 Order now 4.5     42     1.285     37     1     1     500     500     3.4     Enable
Over Current Protection    
Voltage Mode     90     -40 to 125