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Analog Devices LT8603 | Demoboard DC2114A
42V, Low IQ, Quad Output Triple Monolithic Buck Converter and Boost Controller
Overview
| Topology | Buck Converter |
| Input voltage | 3-42 V |
| Output 1 | 8 V / 2.5 A |
Description
Demonstration Circuit 2114A features the LT®8603 with triple monolithic buck regulators and a boost controller. The demo circuit is designed for 8.0V, 5.0V, 3.3V, and 1.8V outputs from a nominal 12V input. The 4th channel is set as a boost converter and is powered from a wide input range with output VOUT4 regulated at 8V if 3V < VIN < 8.5V. It works as diode pass through if the input is above 8.5V. The two high voltage buck regulators are powered from the boost converter. VOUT1 is regulated at 5V with 1.5A maximum output load current, and VOUT2 is at 3.3V with 2.5A maximum output load current. Thanks to the pre-boost converter, they can ride through a cold crank in automotive applications while providing constant output voltages 5V and 3.3V. The low voltage buck is powered from the VOUT2 (3.3V), and the output VOUT3 is regulated at 1.8V with 1.8A maximum load current.
Features
All regulators are synchronized to an internal oscillator that can be programmed with one resistor at the RT pin. Programmable frequency allows optimization between efficiency and external component size. To avoid the audio band, the demo circuit 2114A sets the switching frequency at 2MHz for the three buck regulators, and the boost converter is at 400kHz. At all frequencies, a 180° phase shift is maintained between 1 and 2 channels, reducing the input peak current and voltage ripple
Typical applications
- Automotive, transportation and industry applications.
More information
Products
| Order Code | Datasheet | Simulation | Downloads | Product series | L (mm) | f (mm) | Z @ 100 MHz (Ω) | Zmax (Ω) | Test Condition Zmax | IR 2 (mA) | RDC max. (Ω) | Type | Pins (pcs) | Rows | H (mm) | Gender | IR (mA) | Packaging | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 742792150 | SPEC | 8 files | WE-CBF SMT EMI Suppression Ferrite Bead | 3.2 | – | 80 | 160 | 550 MHz | 4000 | 0.02 | High Current | – | – | 1.1 | – | 2800 | – | ||
 | 62000311121 | SPEC | – | 6 files | WR-PHD 2.00 mm THT Pin Header | 6 | – | – | – | – | – | – | Straight | 3 | Single | – | Pin Header | 2000 | Bag | |
 | 702931000 | SPEC | – | 3 files | WA-SNSR Self-Retaining Spacer | 6.4 | 4.8 | – | – | – | – | – | – | – | – | – | – | – | – |
| Samples |
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| Order Code | Datasheet | Simulation | Downloads | Product series | L (mm) | f (mm) | Z @ 100 MHz (Ω) | Zmax (Ω) | Test Condition Zmax | IR 2 (mA) | RDC max. (Ω) | Type | Pins (pcs) | Rows | H (mm) | Gender | IR (mA) | Packaging | Samples |
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