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Overview
| Topology | Buck Converter |
| Input voltage | 5.5-42 V |
| Switching frequency | 1850-2150 kHz |
| Output 1 | 5 V / 0.75 A |
| IC revision | 1 |
Description
Demonstration Circuit 2565A is a 42V, 0.75A micropowersynchronous step-down regulator featuring the LT®8607.The demo board is designed for 5V output from a 5.5Vto 42V input. The wide input range allows a variety ofinput sources, such as automotive batteries and industrialsupplies. The LT8607 is a compact, high efficiency,high speed synchronous monolithic step-down switchingregulator that consumes less than 3μA of quiescentcurrent when output is regulated at 5V. Top and bottompower switches, compensation components and othernecessary circuits are inside of the LT8607 to minimizeexternal components and simplify design.The SYNC pin on the demo board is grounded by defaultfor low ripple Burst Mode® operation. Move JP1 to PULSESKIPPING position can change the operation mode topulse-skipping operation. Once JP1 is on SPREAD SPECTRUMposition, VCC is applied to the SYNC pin for lowEMI spread spectrum operation. To synchronous to anexternal clock, move JP1 to SYNC and apply the externalclock to the SYNC turret. Figure 1 shows the efficiencyof the circuit.L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarksof Analog Devices, Inc. All other trademarks are the property of their respective owners.Performance SummaryThe demo board has an EMI filter installed. The radiatedEMI performances of the board (with EMI filter) are shownin Figure 2 and Figure 3. The red lines in Figure 2 andFigure 3 are CISPR25 Class 5 peak limit. To use the EMIfilter, the input should be tied to VEMI, not VIN. An inductorL2, which is a 0Ω jumper on the board by defaultnow, can be added in the EMI filter to further reduce theconducted emission.The LT8607 data sheet gives a complete description ofthe part, operation and application information. The datasheet must be read in conjunction with this demo manualfor DC2565A.
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | f(mm) | L(µH) | IRP,40K(A) | ISAT,30%(A) | RDC typ.(mΩ) | fres(MHz) | VOP(V) | Pins | Type | Mount | L(mm) | H(mm) | IR(A) | Working Voltage(V (AC)) | Operating Temperature | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-MAPI SMT Power Inductor, –, 3.3 µH | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-MAPI SMT Power Inductor | – | Inductance3.3 µH | Performance Rated Current2.9 A | Saturation Current @ 30%5.35 A | DC Resistance99 mΩ | Self Resonant Frequency39 MHz | Operating Voltage80 V | Pins2 | – | MountSMT | Length3 mm | Height2 mm | Rated Current2.2 A | – | Operating Temperature -40 °C up to +125 °C | ||||
 | WA-SNSR Self-Retaining Spacer, 4.8 mm, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWA-SNSR Self-Retaining Spacer | Drilling in Panel4.8 mm | – | – | – | – | – | – | – | – | – | Length12.7 mm | – | – | – | Operating Temperature -30 °C up to +85 °C | |||
 | WR-PHD Jumper, –, – | 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 | |||
 | WR-PHD Pin Header, –, – | Simulation– | Downloads7 files | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header | – | – | – | – | – | – | – | Pins8 | TypeStraight | MountTHT | Length8 mm | – | Rated Current2 A | Working Voltage200 V (AC) | Operating Temperature -40 °C up to +105 °C |