LTC3822 - No RSENSE, Low Input Voltage, Synchronous Step-Down DC/DC Controller
Features
- No Current Sense Resistor Required
- All N-Channel MOSFET Synchronous Drive
- High Current Outputs Possible
- Constant Frequency Current Mode Operation for Excellent Line and Load Transient Response
- VIN: 2.75V to 4.5V
- ±1% 0.6V Reference
- Low Dropout Operation: 99% Duty Cycle
- Selectable Frequency (300kHz/550kHz/750kHz)
- Internal Soft-Start Circuitry
- Selectable Maximum Peak Current Sense Threshold
- Digital RUN Control Pin
- Output Overvoltage Protection
- Micropower Shutdown: IQ = 7.5µA
- Tiny Thermally Enhanced Leadless (3mm x 3mm) DFN or 10-Lead MSOP Package
Typical Application
Description
The LTC3822 is a synchronous step-down switching regulator controller that drives external N-channel power MOSFETs using few external components. The constant frequency current mode architecture with MOSFET VDS sensing eliminates the need for sense resistors and improves efficiency.
A maximum duty cycle of 99% provides low dropout operation. The switching frequency can be programmed up to 750kHz, allowing the use of small surface mount inductors and capacitors.
The LTC3822 is available in thermally enhanced DFN and 10-lead MSOP packages.
| Features |
|
| LTC3822 | Internal soft-start, 340uA in sleep mode |
| LTC3822-1 | External soft start, selectable pulse skip/Burst Mode operation, tracking, phase lockable, power good (SSOP-16 package only), 105uA in sleep mode |
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 |
|---|---|---|---|---|---|
| LTC3822EDD#PBF | 3x3 DFN-10 | DD | E | 05-08-1699 | Yes |
| LTC3822EDD#TRPBF | 3x3 DFN-10 | DD | E | 05-08-1699 | Yes |
| LTC3822EMSE#PBF | MS-10E | MSE | E | 05-08-1664 | Yes |
| LTC3822EMSE#TRPBF | MS-10E | MSE | E | 05-08-1664 | 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 | |
|---|---|---|---|---|---|---|
| LTC3822EDD#PBF | 3x3 DFN-10 | E | $2.35 | $1.55 | Yes | |
| LTC3822EDD#TRPBF | 3x3 DFN-10 | E | $1.57 | Yes | ||
| LTC3822EMSE#PBF | MS-10E | E | $2.35 | $1.55 | Yes | |
| LTC3822EMSE#TRPBF | MS-10E | E | $1.61 | 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 |
|---|---|---|---|
| DC1014A | LTC3822EMSE (MSOP) Demo Board | 2.75V ≤ VIN ≤ 4.5V, Vout = 1.8V @ 10A | Contact Factory | |
| DC972A | LTC3822EDD Demo Board (DFN) | 2.75V ≤ VIN ≤ 4.5V, Vout = 1.8V @ 8A | Contact Factory | |
| Buy Now | |||
Applications
- 3.3VIN Systems
- Li-Ion Battery Systems
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Product Notifications
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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:
LTC3822
LTC3822-1
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.
