The LTC3822EGN-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.
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 LTC3822EGN-1 is available in thermally enhanced DFN and 10-lead MSOP packages.
FeaturesLTC3822Internal soft-start, 340μA in sleep modeLTC3822-1External soft start, selectable pulse skip/Burst Mode operation, tracking, phase lockable, power good (SSOP-16 package only), 105μA in sleep modeFeature
- 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 × 3mm) DFN or 10-Lead MSOP Package
Applications
- 3.3VIN Systems
- Li-Ion Battery Systems
(Picture: Pinout)
