LTC1844 - 150mA, Micropower, Low Noise, VLDO Linear Regulator
Features
- 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
Typical Application
Description
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.
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 |
|---|---|---|---|---|---|
| LTC1844ES5-1.5#PBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1844ES5-1.5#TRMPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1844ES5-1.5#TRPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1844ES5-1.8#PBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1844ES5-1.8#TRMPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1844ES5-1.8#TRPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1844ES5-2.5#PBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1844ES5-2.5#TRMPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1844ES5-2.5#TRPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1844ES5-2.8#PBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1844ES5-2.8#TRMPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1844ES5-2.8#TRPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1844ES5-3.3#PBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1844ES5-3.3#TRMPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1844ES5-3.3#TRPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1844ES5-BYP#TRMPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1844ES5-BYP#TRPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1844ES5-SD#PBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1844ES5-SD#TRMPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1844ES5-SD#TRPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
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 | |
|---|---|---|---|---|---|---|
| LTC1844ES5-1.5#PBF | SOT-23 | E | $1.77 | Yes | ||
| LTC1844ES5-1.5#TRMPBF | SOT-23 | E | $1.77 | $1.23 | Yes | |
| LTC1844ES5-1.5#TRPBF | SOT-23 | E | $1.77 | $1.21 | Yes | |
| LTC1844ES5-1.8#PBF | SOT-23 | E | $1.77 | Yes | ||
| LTC1844ES5-1.8#TRMPBF | SOT-23 | E | $1.77 | $1.23 | Yes | |
| LTC1844ES5-1.8#TRPBF | SOT-23 | E | $1.77 | $1.21 | Yes | |
| LTC1844ES5-2.5#PBF | SOT-23 | E | $1.77 | Yes | ||
| LTC1844ES5-2.5#TRMPBF | SOT-23 | E | $1.77 | $1.23 | Yes | |
| LTC1844ES5-2.5#TRPBF | SOT-23 | E | $1.77 | $1.21 | Yes | |
| LTC1844ES5-2.8#PBF | SOT-23 | E | $1.77 | Yes | ||
| LTC1844ES5-2.8#TRMPBF | SOT-23 | E | $1.77 | $1.23 | Yes | |
| LTC1844ES5-2.8#TRPBF | SOT-23 | E | $1.77 | $1.21 | Yes | |
| LTC1844ES5-3.3#PBF | SOT-23 | E | $1.77 | Yes | ||
| LTC1844ES5-3.3#TRMPBF | SOT-23 | E | $1.77 | $1.23 | Yes | |
| LTC1844ES5-3.3#TRPBF | SOT-23 | E | $1.77 | $1.21 | Yes | |
| LTC1844ES5-BYP#TRMPBF | SOT-23 | E | $1.77 | $1.23 | Yes | |
| LTC1844ES5-BYP#TRPBF | SOT-23 | E | $1.77 | $1.21 | Yes | |
| LTC1844ES5-SD#PBF | SOT-23 | E | $1.77 | Yes | ||
| LTC1844ES5-SD#TRMPBF | SOT-23 | E | $1.77 | $1.23 | Yes | |
| LTC1844ES5-SD#TRPBF | SOT-23 | E | $1.77 | $1.21 | Yes | |
| Buy Now • Request Samples | ||||||
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 |
|---|---|---|---|
| DC660A | LTC1844ES5-BYP | Low Noise Micropower Linear Voltage Regulator, Vin = 1.8V - 6.5V, Vout = 150mA Max. | $75.00 | |
| Buy Now | |||
Applications
- Portable Instruments and Battery-Powered Systems
- Bluetooth/802.11 Cards
- Cellular Phones
- PDAs and Notebook Computers
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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:
LTC1844-1.5
LTC1844-1.8
LTC1844-2.5
LTC1844-2.8
LTC1844-3.3
LTC1844-SD
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
