 |
|
Feature Story
Power design for automotive applications
— Introducing AEC-Q100 qualified RT2875 family and its design tool
|
| Challenges when designing DC/DC power circuits for Automotive applications |
 |
Harsh automotive environment :
- The input supply from the car battery can exhibit voltage dips and peaks during cranking or load dump events.
- The nearby AM receiver is sensitive to switching noise, so switching converter EMI noise must be minimized.
- The operating temperature range of the application can be much wider than normal commercial applications.
- Automotive applications require high reliability and good safety protections.
Richtek has released new powerful DC/DC step-down converters and design tools that simplify the automotive power design considerably. .png) |
|
| Introducing RT2875, a highly flexible automotive Buck converter family suitable for a wide range of automotive applications |
 |
Key features for RT2875:
- AEC-Q100 Grade-2 qualified over -40 ~ +105°C temperature range.
- The wide 4.5V ~ 36V input voltage range & 100% duty-cycle mode minimizes output voltage variation over input voltage fluctuation.
- Programmable 300kHz ~ 2.1MHz clock which can be synchronized to an external clock for precise frequency setting to avoid sensitive frequency bands.
- Programmable 1.5~6A current limit sets the maximum inductor peak current to a specific value, allowing optimal inductor choice without risk of saturation in overload condition.
- External compensation to set feedback loop parameters and ensure stable operation at various switching frequencies over the full temperature range.
- Low RDSON MOSFETs and a thermally efficient package allow operation at high ambient temperatures without overheating.
Find out more about RT2875 family : Website / Datasheet / EVB / Get Free sample |
|
| Richtek Designer™, online simulation tool for RT2875 family |
 |
The Richtek Designer™ online simulation tool greatly reduces the RT2875 application design time, does a fully automatic schematic generation based on Design Requirements and can be used to check various operating conditions such as:
- Switching and output voltage during input voltage fluctuations
- Start-up and shut-down sequence from VIN or Enable
- Fast load transient test at different input voltages and switching frequencies
- Current limit behavior during overload conditions
- Gain phase analysis over a wide range of operating conditions
- Efficiency and IC power dissipation analysis
- Measure current and voltage of every circuit component; calculate average, RMS and peak values for component de-rating
- Recommended component BOM generation
Find out more about Richtek Designer to get your automotive design started in no time. |
|
| More design tips for RT2875 family |
| Want to know more? Please read the full application note RT2875 Automotive Buck Converter for a detailed explanation on how to design automotive buck converters using the RT2875 family: |
|
- How to use Richtek Designer tool for determining the circuit component values to meet the design requirements including temperature variation and component tolerances.
- Five different methods to minimize EMI radiation.
- Other application tips: how to use external sync, external bootstrap charging and layout recommendations.
|
 |
|
|
|
|
|
 |
RT8543A is a 2.5V-24V input, up to 43V, 6-string (10 LEDs per sting), 5mA-50mA per channel White LED driver with integrated Boost regulator in WQFN-20L 4x4 package. Featuring with 2% LED string current matching, direct PWM, Mixed Mode and Analog dimming control. Designed as backlight driver for medium-sized LCD panels. |
| RT2658 / 59 / 60 series (5V/3.3V/5V control supply voltage) are 1V-6V input, 6A sink or source output, synchronous Buck converters with REFIN in VQFN-20L 3.5x4 package for DDR-2/3/4 VTT termination. Current mode COT for fast transient response, flexible droop/Non-droop configurations, with tracking or non-tracking mode makes these parts suitable for a wide range of high performance DDR termination applications like Servers, Ethernet switches, Routers, Global storage and Enterprise POL. |
 |
 |
RT5784AB / 85AB (A/B:PSM/PWM) are 2.5V-6V input, 2A output current, 25μA Iq, ACOT® Synchronous Buck Converters with PGOOD in WDFN-8JL 2x1.5(RT5784) and TSOT-23-8(RT5785) packages. The ACOT topology provides ultra-fast transient response, and a constant switching frequency of 1.5MHz. The low Iq and 100% duty cycle dropout mode makes these parts an ideal choice for battery-powered devices, or applications powered from low voltage rails.
⇒ Also see other ACOT® products
⇒ Get Free RT5784A/B, RT5785A/B Sample Now |
|