DocumentationDatasheet
Reliability Data
cad_symbol
ltspice
Features
- Dual N-Channel MOSFET Synchronous Drive
- No Current Sense Resistor Required
- Optimized for 3.3VIN and Li-Ion Applications
- Constant Frequency Current Mode Operation for Excellent Line and Load Transient Response
- ±1% 0.6V Reference
- Low Dropout Operation: 99% Duty Cycle
- Phase-Lockable or Adjustable Frequency: 250kHz to 750kHz
- Internal Soft-Start Circuitry
- Tracking and Adjustable Soft-Start Input
- Selectable Maximum Peak Current Sense Threshold
- Selectable Burst Mode®/ Forced Continuous/Pulse Skipping Mode at Light Load
- Digital RUN Control Pin
- Output Overvoltage Protection
- Micropower Shutdown: IQ = 7.5µA
- Tiny Thermally Enhanced 12-Pin (3mm × 3mm) DFN or 16-Pin Narrow SSOP Packages
Typical Application
Description
The LTC3822-1 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.
Burst Mode operation provides high efficiency at light loads. The 99% maximum duty cycle provides low dropout operation, extending operating time in battery-powered systems.
The operating frequency can be programmed up to 750kHz, allowing the use of small surface mount inductors and capacitors. For noise sensitive applications, the LTC3822-1 can be synchronized to an external clock from 250kHz to 750kHz.
The LTC3822-1 is available in the tiny footprint thermally enhanced 12-pin DFN package or 16-pin narrow SSOP package.
| 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 |
3x3 DFN-12,SSOP-16
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC3822EDD#PBF | DFN | 10 | E | $2.35 | $1.55 |
| LTC3822EDD#TRPBF | DFN | 10 | E | $1.57 | |
| LTC3822EDD-1#PBF | DFN | 12 | E | $2.66 | $1.75 |
| LTC3822EDD-1#TRPBF | DFN | 12 | E | $1.81 | |
| LTC3822EGN-1#PBF | SSOP | 16 | E | $2.66 | $1.75 |
| LTC3822EGN-1#TRPBF | SSOP | 16 | E | $1.81 | |
| LTC3822EMSE#PBF | MSOP | 10 | E | $2.35 | $1.55 |
| LTC3822EMSE#TRPBF | MSOP | 10 | E | $1.61 | |
| LTC3822EDD#TR | DFN | 10 | E | $3.14 | |
| LTC3822EDD | DFN | 10 | E | $4.70 | $3.10 |
| LTC3822EDD-1 | DFN | 12 | E | $5.32 | $3.50 |
| LTC3822EDD-1#TR | DFN | 12 | E | $3.62 | |
| LTC3822EGN-1 | SSOP | 16 | E | $5.32 | $3.50 |
| LTC3822EGN-1#TR | SSOP | 16 | E | $3.62 |
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 |
|---|---|---|---|
| DC1105A | LTC3822EDD-1 Demo Board | $100.00 |