DocumentationDatasheet
Reliability Data
LT Journal
Press Release
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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 |
3x3 DFN-10,MS-10E
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 |
|---|---|---|---|
| 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 |