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Analog Devices LT8685S | Demoboard EVAL-LT8685S
42V Quad, Gangable, Synchronous, Monolithic Step-Down Regulator
Overview
| Topology | Buck Converter |
| Input voltage | 5.6-42 V |
| Switching frequency | 1800-2200 kHz |
| Output 1 | 1.8 V / 4 A |
| Output 2 | 1.2 V / 4 A |
| Output 3 | 5 V / 2.5 A |
| Output 4 | 3.3 V / 2.5 A |
Description
Demonstration circuit EVAL-LT8685S-AZ is a 4-rail power supply featuring the LT ® 8685S, a 42V quad monolithic synchronous step-down silent switcher. The demo circuit is designed for 5V, 3.3V, 1.8V, and 1.2V outputs from a nominal 12V input. The 5V and 3.3V rails are powered from the 12V input, while the 1.8V and 1.2V rails are powered from one of the high voltage buck regulators of 5V or 3.3V. The current capability is 2.5A for the channels 1 and 2. The current ratings for the low voltage channels are 4A. The two 42V regulators may be combined to provide up to 5A of output current using a single inductor. Similarly, the two 8V regulators may be combined to provide up to 8A of output current using a single inductor. Individual track/soft-start, current limit, independent enable and power good for each channel simplify the complex design of quad-output power converters. All regulators can be synchronized to a common external clock input or internal oscillator that can be programmed with a single resistor for switching frequency from 350kHz to 3MHz, allowing for optimal system design per specific applications.
Features
- Silent Switcher®2 Architecture
- Ultralow EMI Emissions
- Optional Spread Spectrum Modulation
- Two High Voltage Synchronous Buck Regulators
- 3V to 42V Input Voltage Range
- Output Currents Up to 2.5A per Channel
- Channels May Be Connected in Parallel Using a Single Inductor
- Two Low Voltage Synchronous Buck Regulators
- 3V to 8V Input Voltage Range
- Output Currents Up to 4A per Channel
- Channels May Be Connected in Parallel Using a Single Inductor
- 12μA IQ All Channels Active and No-Load
- Flexible Supply Sequencing and Control
- Adjustable and Synchronizable: 350kHz to 3MHz
- Available in 36-Lead LQFN (5mm × 6mm)AEC-Q100 Qualified for Automotive Applications
Typical applications
- Automotive Systems
- Power Supplies
- dustrial Controls
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | Z @ 100 MHz(Ω) | Zmax(Ω) | Test Condition Zmax | IR(mA) | Z @ 1 GHz(Ω) | H(mm) | Type | Pins | Mount | L(mm) | Working Voltage(V (AC)) | Operating Temperature | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-MPSB EMI Multilayer Power Suppression Bead, 100 Ω, 160 Ω | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-MPSB EMI Multilayer Power Suppression Bead | Impedance @ 100 MHz100 Ω | Maximum Impedance160 Ω | Maximum Impedance1100 MHz | Rated Current8000 mA | Impedance @ 1 GHz150 Ω | Height2.3 mm | TypeHigh Current | – | MountSMT | Length4.5 mm | – | Operating Temperature -55 °C up to +125 °C | ||||
 | WR-PHD Pin Header, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header | – | – | – | Rated Current2000 mA | – | – | TypeStraight | Pins10 | MountTHT | Length10 mm | Working Voltage200 V (AC) | Operating Temperature -40 °C up to +105 °C | |||
 | WR-PHD Jumper, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Jumper | – | – | – | Rated Current3000 mA | – | – | – | Pins2 | – | – | Working Voltage200 V (AC) | Operating Temperature -25 °C up to +105 °C | |||
 | WR-PHD Pin Header, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header | – | – | – | Rated Current2000 mA | – | – | TypeStraight | Pins3 | MountTHT | Length6 mm | Working Voltage200 V (AC) | Operating Temperature -40 °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 | – | – | – | Rated Current2000 mA | – | – | TypeStraight | Pins6 | MountTHT | Length6 mm | Working Voltage200 V (AC) | Operating Temperature -40 °C up to +105 °C |