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Analog Devices LTC7803-3.3 | Demoboard LTC7803-3.3
40V Low IQ, 3MHz Synchronous Step-Down Controller with Spread Spectrum
Overview
| Topology | Buck Converter |
| Input voltage | 4.5-40 V |
| Output 1 | 3.3 V |
Description
The LTC®7803-3.3 is a high performance synchronous step-down DC/DC switching regulator controller that drives an all N-channel power MOSFET stage.Synchronous rectification increases efficiency, reduces power losses and eases thermal requirements. A constant frequency current mode architecture allows a phase-lockable switching frequency of up to 3MHz. The LTC7803‑3.3 operates from a wide 4.5V to 40V input supply range and regulates the output to a fixed 3.3V voltage using an internal feedback resistor divider.The very low no-load quiescent current extends operating runtime in battery powered systems. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values.The MODE pin selects among Burst Mode operation,pulse-skipping mode, or continuous inductor current mode at light loads.The LTC7803-3.3 additionally features spread spectrum operation which significantly reduces the peak radiatedand conducted noise on both the input and output supplies,making it easier to comply with electromagnetic interference (EMI) standards.
Features
- Low Operating IQ: 12μA (14V VIN to 3.3V VOUT)
- Wide Input Voltage Range: 4.5V to 40V
- Fixed 3.3V Regulated Output Voltage
- Spread Spectrum Operation
- RSENSE or DCR Current Sensing
- Programmable Fixed Frequency (100kHz to 3MHz)
- Phase-Lockable Frequency (100kHz to 3MHz)
- Selectable Continuous, Pulse-Skipping, or Low Ripple Burst -Mode® Operation at Light Loads
- Low Shutdown IQ: 1.2μA
- Thermally Enhanced 16-Lead 3mm × 3mm QFN Package
- AEC-Q100 Qualified for Automotive Applications
Typical applications
- Industrial
- Telecommunications
- Military/Avionics
- Automotive and Transportation
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IR(A) | ISAT(A) | RDC max.(mΩ) | fres(MHz) | Mount | LR(µH) | ISAT,10%(A) | ISAT,30%(A) | RDC(mΩ) | Material | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-HCM SMT High Current Flat Wire Inductor, 0.22 µH, 60 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCM SMT High Current Flat Wire Inductor | Inductance0.22 µH | Rated Current60 A | – | – | Self Resonant Frequency52 MHz | MountSMT | Rated Inductance0.154 µH | Saturation Current @ 10%52.7 A | Saturation Current @ 30%59.3 A | DC Resistance0.18 mΩ | MaterialMnZn | ||||
 | WE-CHSA SMT High Current Inductor, 0.68 µH, 25.3 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CHSA SMT High Current Inductor | Inductance0.68 µH | Rated Current25.3 A | Saturation Current41.4 A | DC Resistance2.05 mΩ | Self Resonant Frequency88 MHz | MountSMT | – | – | – | – | – |