Features and Benefits
- No Current Sense Resistor Required
- 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 Pulse Skipping 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 LTC3772B 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 LTC3772B automatically switches into pulse skipping operation at light loads. It consumes only 200μA of quiescent current under a no-load condition.
The LTC3772B 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 924 is a No RSENSE™ constant frequency step-down DC/DC converter featuring the LTC3772B (Burst Mode disabled), nonsynchronous controller in a 3mm x 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.
Tools & Simulations
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Sample & Buy
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