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Analog Devices LT8390 | Demoboard LT Journal
60V Synchronous 4-Switch Buck-Boost Controller with Spread Spectrum
Overview
| Topology | Buck-Boost Converter |
| Input voltage | 0-48 V |
| Switching frequency | 150-650 kHz |
| Output 1 | 12 V |
| IC revision | 1 |
Description
The LT®8390 is a synchronous 4-switch buck-boost DC/DCcontroller that regulates output voltage, input or outputcurrent from an input voltage above, below, or equal tothe output voltage. The proprietary peak-buck/peak-boostcurrent mode control scheme allows adjustable and synchronizable150kHz to 650kHz fixed frequency operation, orinternal ±15% triangle spread spectrum frequency modulationfor low EMI. With a 4V to 60V input voltage range, 0Vto 60V output voltage capability, and seamless low-noisetransitions between operation regions, the LT8390 is idealfor voltage regulator, battery and supercapacitor chargerapplications in automotive, industrial, telecom, and evenbattery-powered systems.The LT8390 provides input or output current monitor andpower good flag. Fault protection is also provided to detectoutput short-circuit condition, during which the LT8390retries, latches off, or keeps running.
Features
4-Switch Single Inductor Architecture Allows VIN Above, Below or Equal to VOUTSynchronous Switching: Up to 98% EfficiencyProprietary Peak-Buck Peak-Boost Current ModeWide VIN Range: 4V to 60V±1.5% Output Voltage Accuracy: 1V ≤ VOUT ≤ 60V±3% Input or Output Current Accuracy with MonitorSpread Spectrum Frequency Modulation for Low EMIHigh Side PMOS Load Switch DriverIntegrated Bootstrap DiodesNo Top MOSFET Refresh Noise in Buck or BoostAdjustable and Synchronizable: 150kHz to 650kHzVOUT Disconnected from VIN During ShutdownAvailable in 28-Lead TSSOP with Exposed Pad and 28-Lead QFN (4mm × 5mm)
Typical applications
- Automotive, Industrial, Telecom Systems
- High Power Battery-Powered System
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC(mΩ) | fres(MHz) | Material | Wire Type | Z @ 100 MHz(Ω) | Zmax(Ω) | Test Condition Zmax | IR 2(mA) | RDC max.(mΩ) | Type | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-HCI SMT Flat Wire High Current Inductor, 1.5 µH, 16.4 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance1.5 µH | Performance Rated Current16.4 A | Saturation Current @ 10%4 A | Saturation Current @ 30%11 A | DC Resistance4.3 mΩ | Self Resonant Frequency110 MHz | MaterialSuperflux | – | – | – | – | – | DC Resistance4.73 mΩ | – | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 4.2 µH, 15.4 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance4.2 µH | Performance Rated Current15.4 A | Saturation Current @ 10%5 A | Saturation Current @ 30%14 A | DC Resistance7.1 mΩ | Self Resonant Frequency33 MHz | MaterialSuperflux | – | – | – | – | – | DC Resistance7.87 mΩ | – | ||||
 | WE-HCF SMT High Current Inductor, 4.7 µH, 34.95 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCF SMT High Current Inductor | Inductance4.7 µH | Performance Rated Current34.95 A | Saturation Current @ 10%70 A | Saturation Current @ 30%78 A | DC Resistance2.4 mΩ | Self Resonant Frequency20 MHz | MaterialMnZn | Wire TypeFlat | – | – | – | – | DC Resistance2.64 mΩ | – | ||||
 | WE-CBF SMT EMI Suppression Ferrite Bead, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CBF SMT EMI Suppression Ferrite Bead | – | – | – | – | – | – | – | – | Impedance @ 100 MHz600 Ω | Maximum Impedance650 Ω | Maximum Impedance80 MHz | Rated Current 22500 mA | DC Resistance70 mΩ | TypeHigh Current |