LTC1622 - Low Input Voltage Current Mode Step-Down DC/DC Controller
Features
- High Efficiency
- Constant Frequency 550kHz Operation
- VIN Range: 2V to 10V
- Multiampere Output Currents
- OPTI-LOOP Compensation Minimizes COUT
- Selectable, Burst Mode Operation
- Low Dropout Operation: 100% Duty Cycle
- Synchronizable up to 750kHz
- Current Mode Operation for Excellent Line and Load
Transient Response - Low Quiescent Current: 350µA
- Shutdown Mode Draws Only 15µA Supply Current
- ±1.9% Reference Accuracy
- Available in 8-Lead MSOP
Typical Application
Description
The LTC1622 is a constant frequency current mode step-down DC/DC controller providing excellent AC and DC load and line regulation. The device incorporates an accurate undervoltage feature that shuts the LTC1622 down when the input voltage falls below 2V.The LTC1622 boasts a ±1.9% output voltage accuracy and consumes only 350µA of quiescent current. For applications where efficiency is a prime consideration and the load current varies from light to heavy, the LTC1622 can be configured for Burst Mode™ operation. Burst Mode operation enhances low current efficiency and extends battery run time. Burst Mode operation is inhibited during synchronization or when the SYNC/MODE pin is pulled low to reduce noise and possible RF interference.
High constant operating frequency of 550kHz allows the use of a small inductor. The device can also be synchronized up to 750kHz for special applications. The high frequency operation and the available 8-lead MSOP package create a high performance solution in an extremely small amount of PCB area.
To further maximize the life of the battery source, the P-channel MOSFET is turned on continuously in dropout (100% duty cycle). In shutdown, the device draws a mere 15µA.
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 |
|---|---|---|---|---|---|
| LTC1622CMS8#PBF | MS-8 | MS8 | C | 05-08-1660 | Yes |
| LTC1622CMS8#TRPBF | MS-8 | MS8 | C | 05-08-1660 | Yes |
| LTC1622CS8#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LTC1622CS8#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LTC1622IS8#PBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
| LTC1622IS8#TRPBF | SO-8 | S8 | I | 05-08-1610 (S8) | 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 | |
|---|---|---|---|---|---|---|
| LTC1622CMS8#PBF | MS-8 | C | $2.35 | $2.05 | Yes | |
| LTC1622CMS8#TRPBF | MS-8 | C | $2.11 | Yes | ||
| LTC1622CS8#PBF | SO-8 | C | $2.10 | $1.85 | Yes | |
| LTC1622CS8#TRPBF | SO-8 | C | $1.91 | Yes | ||
| LTC1622IS8#PBF | SO-8 | I | $2.60 | $2.20 | Yes | |
| LTC1622IS8#TRPBF | SO-8 | I | $2.26 | 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 |
|---|---|---|---|
| DC232A | LTC1622MS8 | Low Input Voltage Current Mode Step-Down DC/DC Converter, 2 to 8Vin, 1.8, 2.5, or 3.3Vout @ 800mA | $75.00 | |
| Buy Now | |||
Applications
- 1- or 2-Cell Li-Ion Powered Applications
- Cellular Telephones
- Wireless Modems
- Portable Computers
- Distributed 3.3V, 2.5V or 1.8V Power Systems
- Scanners
- Battery-Powered Equipment
People Who Viewed This Product Also Viewed
- LTC1624 - High Efficiency SO-8 N-Channel Switching Regulator Controller
- LTC3891 - Low IQ, 60V Synchronous Step-Down Controller
- LT3724 - High Voltage, Current Mode Switching Regulator Controller
- LTC1771 - 10µA Quiescent Current High Efficiency Step-Down DC/DC Controller
- LT8705 - 80V VIN and VOUT Synchronous 4-Switch Buck- Boost DC/DC Controller
- LT3080 - Adjustable 1.1A Single Resistor Low Dropout Regulator
- LTC3810 - 100V Current Mode Synchronous Switching Regulator Controller
- LT3844 - High Voltage, Current Mode Switching Regulator Controller with Programmable Operating Frequency
- LTC4364 - Surge Stopper with Ideal Diode
- LT4363 - High Voltage Surge Stopper with Current Limit
Product Notifications
Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.
Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.
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:
LTC1622
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.
