LT3150 - Fast Transient Response, Low Input Voltage, Very Low Dropout Linear Regulator Controller

Features

  • Fast Transient Response Optimized with Ceramic Output Capacitors
  • FET RDS(ON) Defines Dropout Voltage
  • ±1% Reference Tolerance Over Temperature
  • Multifunction LDO Shutdown Pin with Latchoff
  • Fixed Frequency 1.4MHz Boost Converter Generates MOSFET Gate Drive
  • Internally Compensated Current Mode PWM
  • Boost Converter Uses Tiny Capacitors and Inductor
  • Independent Boost Converter Shutdown Control Permits LDO Output Voltage Supply Sequencing
  • 16-Lead SSOP Package

Typical Application

LT3150 Typical Application
LT3150 Typical Application

Description

The LT3150 drives a low cost external N-channel MOSFET as a source follower to produce a fast transient response, very low dropout voltage linear regulator. Selection of the N-channel MOSFET RDS(ON) allows dropout voltages below 300mV for low VIN to low VOUT applications.

The LT3150 includes a fixed frequency boost regulator that generates gate drive for the N-channel MOSFET. The internally compensated current mode PWM architecture combined with the 1.4MHz switching frequency permits the use of tiny, low cost capacitors and inductors.

The LT3150’s transient load performance is optimized with ceramic output capacitors. A precision 1.21V reference accommodates low voltage supplies.

Protection includes a high side current limit amplifier that activates a fault timer circuit. A multifunction shutdown pin provides either current limit time-out with latchoff, overvoltage protection or thermal shutdown. Independent shutdown control of the boost converter provides on/off and sequencing control of the LDO output voltage.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LT3150CGN#PBF SSOP-16 GN C 05-08-1641 (GN16) Yes
LT3150CGN#TRPBF SSOP-16 GN C 05-08-1641 (GN16) Yes


LT3150 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT3150CGN#PBF SSOP-16 C $5.29 $3.70 Yes
LT3150CGN#TRPBF SSOP-16 C $3.76 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC534A LT3150CGN Demo Board | Low Voltage LDO Linear Regulator Controller, 1.1V ≤ VIN ≤ 10V, Vout = 1.2V/1.5/1.8V @ 4A $100.00
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Click here to view our complete list of demo boards

Applications

  • Microprocessor, ASIC and I/O Supplies
  • Very Low Dropout Input-to-Output Conversion
  • Logic Termination Supplies

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LT3150

Technical Support