LTC1844

PRODUCTION

150mA, Micropower, Low Noise, VLDO Linear Regulator

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Overview

  • Very Low Dropout:
    • 90mV at 150mA
    • 30mV at 50mA (LTC1844-3.3)
  • Wide Input Voltage Range: 1.6V to 6.5V
  • Low 35µA Supply Current, Even in Dropout
  • Low Noise: 60µVRMS (10Hz to 100kHz)
  • ±1.75% Voltage Accuracy Over Temperature, Voltage and Current Ranges
  • Fast Transient Response
  • 10nA Supply Current in Shutdown
  • Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 2.8V, 3.3V
  • Adjustable Output Voltage: 1.25V to 6V
  • Output Current Limit
  • Reverse-Battery and Reverse-Current Protection
  • No Protection Diodes Needed
  • Stable with 1µF Output Capacitor
  • Stable with Ceramic Capacitors
  • Short-Circuit and Thermal Overload Protection
  • Low Profile (1mm) SOT-23 Package

The LTC1844 Series are low noise VLDO™ (very low dropout) linear regulators designed for low power/portable applications. These regulators can operate from input voltages as low as 1.6V. Typical output noise is only 30µVRMS and typical dropout for the LTC1844-3.3 is just 90mV at the maximum load current of 150mA, reducing to 30mV at 50mA.

The internal P-channel MOSFET pass transistor requires no base current, allowing the device to draw only 35µA during normal operation, independent of the dropout voltage and load current. The quiescent current falls to a negligible 10nA during shutdown.

Other features include high output voltage accuracy, excellent transient response, stability with ultralow ESR ceramic capacitors as small as 1µF, reverse-battery and reverse-current protection, short-circuit and thermal overload protection and output current limiting.

The LTC1844 regulators are available in a low profile (1mm) SOT-23 (ThinSOT™) package.

Applications

  • Portable Instruments and Battery-Powered Systems
  • Bluetooth/802.11 Cards
  • Cellular Phones
  • PDAs and Notebook Computers
LTC1844
150mA, Micropower, Low Noise, VLDO Linear Regulator
Fixed Voltage Low Noise, VLDO Linear Regulator LTC1844-3.3 Dropout Voltage vs Load Current Product Package 1 Product Package 2 Product Package 3
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Application Note 1

Technical Articles 2

Data Sheet

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

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Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC1844-1.5
  • LTC1844-1.8
  • LTC1844-2.5
  • LTC1844-2.8
  • LTC1844-3.3
  • LTC1844-SD
LTspice

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.

Evaluation Kits

eval board
schematic 1
DC660A

LTC1844ES5-BYP | Low Noise Micropower Linear Voltage Regulator, VIN = 1.8V - 6.5V, VOUT = 150mA Max.

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Product Details

DC660A: Demo Board for the LTC1844 150mA, Micropower, Low Noise, VLDO Linear Regulator.


 
DC660A
LTC1844ES5-BYP | Low Noise Micropower Linear Voltage Regulator, VIN = 1.8V - 6.5V, VOUT = 150mA Max.
DC660A - Schematic

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