LT1941
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LT1941

Triple Monolithic Switching Regulator

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Info: : PRODUCTION tooltip
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Part Details
Part Models 2
1ku List Price Starting From $6.95
Features
  • Wide Input Range: 3.5V to 25V
  • Three Switching Regulators with Internal Power Switches: 3A Step-Down, 2A Step-Down, 1.5A Inverting/Boost
  • Antiphase Switching Reduces Ripple
  • Independent Shutdown/Soft-Start Pins
  • Independent Power Good Indicators Ease Supply Sequencing
  • Input Voltage Power Good Indicators Monitor Input Supply
  • Uses Small Inductors and Ceramic Capacitors
  • Constant 1.1MHz Switching Frequency
  • Thermally Enhanced 28-Lead TSSOP Package
Additional Details
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The LT1941 is a triple current mode DC/DC converter with internal power switches. Two of the regulators are step-down converters with 3A and 2A power switches. The third regulator can be configured as a boost, inverter or SEPIC converter and has a 1.5A power switch. All three converters are synchronized to a 1.1MHz oscillator. The two step-down converters run with opposite phase, reducing input ripple current. The output voltages are set with external resistor dividers and each regulator has independent shutdown and soft-start circuits. Each regulator generates a power good signal when its output is in regulation, easing power supply sequencing and interfacing with microcontrollers and DSPs.

The high switching frequency offers several advantages by permitting the use of small inductors and ceramic capacitors, leading to a very small triple output solution. The constant switching frequency, combined with low impedance ceramic capacitors, result in low, predictable output ripple. With its wide input voltage range of 3.5V to 25V, the LT1941 regulates a broad array of power sources from 4-cell batteries and 5V logic rails to unregulated wall transformers, lead acid batteries and distributed-power supplies.

Applications

  • Cable Modems
  • DSL Modems
  • Distributed Power Regulation
  • Wall Transformer Regulation
  • Disk Drives
  • DSP Power
Part Models 2
1ku List Price Starting From $6.95

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT1941EFE#PBF
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LT1941EFE#TRPBF
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Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

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

LT1941EFE#PBF

PRODUCTION

LT1941EFE#TRPBF

PRODUCTION

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

LT1941EFE#PBF

PRODUCTION

LT1941EFE#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC621A

LT1941EFE Demo Board | 4.7V ≤ VIN ≤ 14V, VOUT1 = 1.8V @ 2.4A, VOUT2 = 3.3V @ 1.4A, VOUT3 = –12V @ Up to 550mA

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DC621A

LT1941EFE Demo Board | 4.7V ≤ VIN ≤ 14V, VOUT1 = 1.8V @ 2.4A, VOUT2 = 3.3V @ 1.4A, VOUT3 = –12V @ Up to 550mA

LT1941EFE Demo Board | 4.7V ≤ VIN ≤ 14V, VOUT1 = 1.8V @ 2.4A, VOUT2 = 3.3V @ 1.4A, VOUT3 = –12V @ Up to 550mA

Product Detail

Demonstration circuit 621 is a 1.25MHz triple DC/DC switching converter using the LT1941. The LT1941 has two step-down converters and a third boost/inverting converter that can also be configured as a SEPIC or Cuk (inverting). The LT1941 has a wide 3.5V to 25V input voltage range; the demo board limits this range from 4.7V to 14V and is configured to provide 1.8V @ 2.4A, 3.3V @ 1.4A and –12V @ up to 550mA (depending on VIN).

Tools & Simulations

Tools & Simulations 1

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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