Features and Benefits
- No Current Sense Resistor Required
- 40µA No-Load Quiescent Current
- High Output Currents Easily Achieved
- Internal Soft-Start Ramps VOUT
- Wide VIN Range: 2.75V to 9.8V
- Low Dropout: 100% Duty Cycle
- Constant Frequency 550kHz Operation
- Low Ripple Burst Mode® Operation at Light Load
- Output Voltage as Low as 0.8V
- ±1.5% Voltage Reference Accuracy
- Current Mode Operation for Excellent Line and Load Transient Response
- Only 8µA Supply Current in Shutdown
- Low Profile 8-Lead SOT-23 (1mm) and (3mm × 2mm) DFN (0.75mm) Packages
The LTC3772 is a constant frequency current mode step-down DC/DC controller in a low profile 8-lead SOT-23 (ThinSOT™) and a 3mm × 2mm DFN package. The No RSENSE™ architecture eliminates the need for a current sense resistor, improving efficiency and saving board space.
The LTC3772 automatically switches into Burst Mode operation at light loads to increase efficiency at low output current. It consumes only 40µA of quiescent current under a no-load condition.
The LTC3772 incorporates an undervoltage lockout feature that shuts down the device when the input voltage falls below 2V. To maximize the runtime from a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle). High switching frequency of 550kHz allows the use of a small inductor and capacitors. An internal soft-start smoothly ramps the output voltage from zero to its regulation point.
- 1- or 2-Cell Li-Ion Battery-Powered Applications
- Wireless Devices
- Portable Computers
- Distributed Power Systems
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Demonstration circuit 836 is a No RSENSE™ constant frequency step-down DC/DC converter featuring the LTC3772 Burst-Mode capable, nonsynchronous controller in a 3mm × 2mm DFN package. The demo board has an input voltage range of 2.75V to 8V and provides 2A at one of the three jumper-selectable output voltages: 1.8V, 2.5V or 3.3V.
Documentation & Resources
R421 Reliability Data3/23/201866 K
DC836A - Demo Manual9/24/2009122K
Tiny DC/DC Buck Controller Provides High Efficiency and Low Ripple12/1/2005 LT Journal
Tools & Simulations
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Models for the following parts are available in LTspice:
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|LTC3772EDDB#TRMPBF||Material Declaration||Reliability Data||8-Lead DFN (3mm x 2mm w/ EP)|
|LTC3772EDDB#TRPBF||Material Declaration||Reliability Data||8-Lead DFN (3mm x 2mm w/ EP)|
|LTC3772ETS8#TRMPBF||Material Declaration||Reliability Data||8-Lead SOT-23|
|LTC3772ETS8#TRPBF||Material Declaration||Reliability Data||8-Lead SOT-23|
|Wafer Fabrication Data||R421 Reliability Data|
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