LT3150

RECOMMENDED FOR NEW DESIGNS

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

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Overview

  • 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

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.

Applications

  • Microprocessor, ASIC and I/O Supplies
  • Very Low Dropout Input-to-Output Conversion
  • Logic Termination Supplies
LT3150
Fast Transient Response, Low Input Voltage, Very Low Dropout Linear Regulator Controller
1.8V to 1.5V, 4A Very Low Dropout Linear Regulator (Typical Dropout Voltage = 65mV at IOUT = 4A) Transient Response for 0.1A to 4A Output Load Step Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 2

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LT3150
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Evaluation Kits

eval board
schematic 1
DC534A

LT3150CGN Demo Board | Low Voltage LDO Linear Regulator Controller, 1.1V ≤ VIN ≤ 10V, VOUT = 1.2V/1.5/1.8V @ 4A

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Product Details

Demonstration circuit 534 is a fast transient response, very low dropout linear regulator featuring the 4A output current LT3150 linear regulator controller. The DC534 has an input voltage range of 1.1V to 10V and generates a jumper-selectable output voltage of 1.2V, 1.5V or 1.8V.


With the LT3150 driving external N-channel MOSFETs as source followers, the DC534 can produce very fast transient response. The proper selection of the Rds(on) of the MOSFETs allows dropout voltages below 300 mV. These capabilities, plus its ability to maintain stable operation with ceramic output capacitors, make the DC534 voltage regulator ideally suited for low VIN-to-VOUT applications, such as microprocessor/microcontroller/FPGA power supplies.
DC534A
LT3150CGN Demo Board | Low Voltage LDO Linear Regulator Controller, 1.1V ≤ VIN ≤ 10V, VOUT = 1.2V/1.5/1.8V @ 4A
DC534A - Schematic

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