LTC7149
Info : RECOMMENDED FOR NEW DESIGNS
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LTC7149

60V, 4A Synchronous Step-Down Regulator for Inverting Outputs

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 8
1ku List Price Starting From $6.72
Features
  • Wide VIN Range: 3.4V to 60V
  • Wide VOUT Range: 0V to –28V
  • Single Resistor VOUT Programming
  • Integrated 110mΩ Top N-Channel/50mΩ Bottom N-Channel MOSFETs
  • Regulated IQ: 440μA, Shutdown IQ: 15μA
  • Board GND Referenced I/O Pins (RUN, PGOOD, MODE/SYNC)
  • Accurate Resistor Programmable Frequency (300kHz to 3MHz) with ±50% Frequency Sync Range
  • 92% Efficiency with 12 VIN and –5VOUT
  • ±0.8% Output Voltage Accuracy
  • Peak Current Mode Operation
  • Burst Mode® Operation, Forced Continuous Mode
  • Programmable Soft-Start
  • Overtemperature Protection
  • Available in 28-Lead (4mm x 5mm) QFN and TSSOP Packages
Additional Details
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The LTC7149 is a high efficiency 60V, 4A synchronous monolithic step-down regulator for inverting output applications. The regulator features a single resistor programmable output voltage and high efficiency over a wide VOUT range.

The inverting regulator operates from an input voltage range of 3.4V to 60V and provides an adjustable output from (–28V) to zero volts while delivering up to 4A of inductor current. The switching frequency is also set with an external resistor. A user-selectable mode input is provided to allow the user to trade off ripple noise for efficiency at light loads; Burst Mode operation provides the highest efficiency at light loads, while forced continuous mode provides low output ripple. The MODE/SYNC pin can also be used to synchronize the switching frequency to an external clock. Internal level-shift circuits allow the I/O pins (RUN, MODE/SYNC, PGOOD) to be referenced to board GND.

The LTC7149 operates with a peak current mode architecture that allows for fast transient response with inherent cycle-to-cycle current limit protection.

Applications

  • Industrial Applications
  • Telecom Power Supplies
  • Distributed Power Systems
Part Models 8
1ku List Price Starting From $6.72

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

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Apr 6, 2022

- 22_0068

Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

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May 17, 2019

- 19_0067

Notification of Wafer Fab Location Change for 0.35 BCD Process

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Filter by Model

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Part Models

Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

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Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LTC7149EFE#PBF

PRODUCTION

LTC7149EFE#TRPBF

PRODUCTION

LTC7149IFE#PBF

PRODUCTION

LTC7149IFE#TRPBF

PRODUCTION

May 17, 2019

- 19_0067

arrow down

Notification of Wafer Fab Location Change for 0.35 BCD Process

LTC7149EFE#PBF

PRODUCTION

LTC7149EFE#TRPBF

PRODUCTION

LTC7149EUFD#PBF

PRODUCTION

LTC7149EUFD#TRPBF

PRODUCTION

LTC7149IFE#PBF

PRODUCTION

LTC7149IFE#TRPBF

PRODUCTION

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

reference details image

DC2354A

LTC7149 Demo Board | Buck Configured as Negative VOUT; 3.5V ≤ VIN ≤ 55V; VOUT = –3.3V/–5V/Adjustable to –56V @ up to 4A

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DC2354A

LTC7149 Demo Board | Buck Configured as Negative VOUT; 3.5V ≤ VIN ≤ 55V; VOUT = –3.3V/–5V/Adjustable to –56V @ up to 4A

LTC7149 Demo Board | Buck Configured as Negative VOUT; 3.5V ≤ VIN ≤ 55V; VOUT = –3.3V/–5V/Adjustable to –56V @ up to 4A

Product Detail

Demonstration circuit 2354A is a high input voltage, high efficiency synchronous monolithic step-down converter with a negative output voltage featuring the LTC7149. DC2354A has a wide input voltage range from 3.5V up to 55V. The output voltage of the DC2354A can be set  to –3.3V or –5V, and the “User Select” option allows the output voltage to be set from 0V to –60V; however the voltage difference between the output voltage (–VOUT) and maximum input voltage (VIN), should not exceed 60V. |–VOUT| + VIN < 60V. DC2354A is capable of delivering up to 4A of output current, nevertheless at lower input voltages, the load current should be reduced in accordance with the derating curves. DC2354A supports three operation modes: fixed-frequency modulation, Burst Mode operation and synchronization to an external clock. Fixed-frequency mode maximizes the output current, reduces output voltage ripple, and yields a low noise switching spectrum. Burst Mode operation employs a variable frequency switching algorithm that minimizes the no-load input quiescent current and improves efficiency at light loads.

Tools & Simulations

Tools & Simulations 2

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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