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Overview
| Topology | Buck-Boost Converter |
| Input voltage | 4-60 V |
| Switching frequency | 600-2000 kHz |
| Output 1 | 12 V / 4 A |
| IC revision | A |
Description
Demonstration circuit 2598A is a 60V 2MHz synchronousbuck-boost controller featuring the LT®8390A. It acceptsan input voltage from 4V to 24V (with transient to 60V) andregulates 12V output at up to 4A. DC2598A features highefficiency and 2MHz switching frequency, a high speedfor a 4-switch buck-boost controller. It has a PGOOD flag,short-circuit fault protection, ISMON current-monitoringoutput signal, and spread spectrum frequency modulation(SSFM) or frequency synchronization.The LT8390A has a wide input voltage range from 4V to60V. It can regulate an output as a boost, a buck, or a4-switch boost-buck controller. It has adjustable switchingfrequency between 600kHz and 2MHz. It has an optionfor external frequency synchronization or spread spectrumfrequency modulation. Its high switching frequencyis unique to buck-boost controller ICs. Because of this, itcan be used for high power when the input may be above,below, or equal to the output.DC2598A features an option to turn on spread spectrumby simply changing the position of a jumper from “NOSSFM/SYNC” to “SSFM” (or to ”SYNC”).Small ceramic input and output capacitors are used tosave space and cost. There is a protection diode fromLED+ to GND to prevent negative ringing during a shortcircuitwith long wires. Optional EMI input, output, andgate resistor component placeholders exist when a lowEMI application is needed.Under voltage lockout can be adjusted with a few resistorsand output voltage can be changed from 12V with FB resistorschanges. Please note that higher voltage outputs mayrequire higher voltage MOSFETs and output capacitors.The LT8390A data sheet gives a complete description of thepart, operation and applications information. The data sheetmust be read in conjunction with this demo manual fordemonstration circuit 2598A. The LT8390AEUFD is assembledin a 28-lead 4mm × 5mm plastic QFN package with athermally enhanced ground pad. LT8390A is also availablein a 28-Lead plastic TSSOP (FE) package. Proper boardlayout is essential for maximum thermal performance. Seethe data sheet section “Layout Considerations”.
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | f(mm) | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC max.(mΩ) | fres(MHz) | Pins | Type | Mount | L(mm) | H(mm) | IR(A) | Working Voltage(V (AC)) | Operating Temperature | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | SPEC | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LHMI SMT Power Inductor | – | Inductance1 µH | Performance Rated Current8.6 A | Saturation Current @ 10%7.4 A | Saturation Current @ 30%14.2 A | DC Resistance14 mΩ | Self Resonant Frequency60 MHz | Pins2 | – | MountSMT | Length5.7 mm | Height2.8 mm | – | – | Operating Temperature -40 °C up to +125 °C | ||||
 | SPEC | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWA-SNSR Self-Retaining Spacer | Drilling in Panel4.8 mm | – | – | – | – | – | – | – | – | – | Length9.5 mm | – | – | – | Operating Temperature -30 °C up to +85 °C | |||
 | SPEC | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Jumper | – | – | – | – | – | – | – | Pins2 | – | – | – | – | Rated Current3 A | Working Voltage200 V (AC) | Operating Temperature -25 °C up to +105 °C | |||
 | SPEC | Simulation– | Downloads7 files | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header | – | – | – | – | – | – | – | Pins6 | TypeStraight | MountTHT | Length6 mm | – | Rated Current2 A | Working Voltage200 V (AC) | Operating Temperature -40 °C up to +105 °C |