LTC1874 - Dual Constant Frequency Current Mode Step-Down DC/DC Controller
Features
- High Efficiency: Up to 94%
- High Output Currents Easily Achieved
- Wide VIN Range: 2.5V to 9.8V
- Constant Frequency 550kHz Operation
- Burst Mode™ Operation at Light Load
- Low Dropout: 100% Duty Cycle
- 0.8V Reference Allows Low Output Voltages
- Current Mode Operation for Excellent Line and Load Transient Response
- Low Quiescent Current: 270µA (Each Controller)
- Separate Shutdown Pin for Each Controller
- Shutdown Mode Draws Only 8µA Supply Current (Each Controller)
- ±2.5% Reference Accuracy
- Available in 16-Lead Narrow SSOP
- Each Controller Functions Independent of the Other
Typical Application
Description
The LTC1874 is a dual constant frequency current mode step-down DC/DC controller with excellent AC and DC load and line regulation. Each controller has an accurate undervoltage lockout that shuts down the individual controller when the input voltage falls below 2.0V.The LTC1874 boasts ±2.5% output voltage accuracy and consumes only 270µA of quiescent current per controller. The LTC1874 is configured with Burst Mode operation, which enhances efficiency at low output current for applications where efficiency is a prime consideration.
To further maximize the life of a battery source, each external P-channel MOSFET is turned on continuously in dropout (100% duty cycle). In shutdown, each controller draws a mere 8µA. High constant operating frequency of 550kHz allows the use of small external inductors.
The LTC1874 is available in a small footprint 16-lead narrow SSOP.
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 |
|---|---|---|---|---|---|
| LTC1874EGN#PBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | Yes |
| LTC1874EGN#TRPBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | 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 | |
|---|---|---|---|---|---|---|
| LTC1874EGN#PBF | SSOP-16 | E | $3.91 | $3.30 | Yes | |
| LTC1874EGN#TRPBF | SSOP-16 | E | $3.36 | 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.Click here to view our complete list of demo boards
Applications
- 1- or 2-Cell Lithium-Ion-Powered Applications
- Distributed 3.3V, 2.5V or 1.8V Power Systems
- Personal Information Appliances
- Portable 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:
LTC1874
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.
