description
The LT3029 is a dual, micropower, low noise, low dropout linear regulator. The device's input voltage range is 1.8V to 20V and can be operated with a common input supply or with a separate input supply per channel. Each output provides up to 500mA of output current and a typical dropout voltage of 300mV. In the differential pressure state, the quiescent current is well controlled. With an external 10nF bypass capacitor, the output noise can be reduced to only 20μVRMS (within 10Hz to 100kHz bandwidth).
Designed for use in battery-powered systems, the device's low quiescent current of 55μA per channel makes it an ideal choice. In shutdown mode, the quiescent current is reduced to less than 1μA. Downtime control is independent for each channel, providing flexibility in power management.
The LT3029 optimizes stability and transient response with low ESR ceramic output capacitors, requiring a minimum capacitance of only 3.3μF. This regulator does not require additional ESR as is common with other regulators.
Internal circuitry provides reverse battery protection, reverse current protection, foldback current limiting, and thermal shutdown. The device can be used as an adjustable output voltage device with a 1.215V reference. The LT3029 is available in a thermally enhanced 16-lead MSOP package and a 16-pin, low profile (4mm x 3mm x 0.75mm) DFN package.
Characteristics
Output current: 500mA per channel
Low dropout voltage: 300mV
Low noise: 20μVRMS (10Hz to 100kHz)
Low quiescent current: 55μA per channel
Wide input voltage range: 1.8V to 20V (common or independent input power)
Adjustable Output: 1.215V Reference Voltage with Very Low Quiescent Current in Shutdown Mode: <1μA per Channel
A 3.3μF (minimum) output capacitor enables stable use of ceramic capacitors, tantalum capacitors or aluminum electrolytic capacitors for stable reverse battery protection and reverse output to input protector foldback for current limiting and thermal shutdown tracking/sequencing capabilities: Compatible with LTC292X Power Tracking ICs Thermally Enhanced 16-Lead MSOP Package and 16-Pin (4mm x 3mm) DFN Seal
application
Universal Linear Regulator Battery-Powered System Microprocessor Core / Logic Power Supply Post-Regulator Tracking / Sorting Power Supply for Switching Power Supplies
LT3029 Typical Application Circuit
LT3029 data sheet download: http://
What is Car Ethernet
Car Ethernet is a new local area network technology that uses Ethernet to connect the electronic unit in the car. Unlike traditional Ethernet, which uses 4 unshielded twisted pair cables, car Ethernet can achieve a transmission rate of 100Mbit/s or even 1Gbit/s on a single pair of unshielded twisted pair cables. At the same time, it also meets the requirements of the automotive industry for high reliability, low electromagnetic radiation, low power consumption, bandwidth allocation, low latency and synchronous real-time. The physical layer of on-board Ethernet uses BroadRReach technology, and BroadR-Reach's physical layer (PHY) technology has been standardized by the One-pair Ethernet Alliance (OPEN). Therefore, it is sometimes called Broad RReach (BRR) or OABR (Open Alliance BroadR-Reach). The MAC layer of vehicle Ethernet adopts the IEEE 802.3 interface standard and seamlessly supports widely used high-level network protocols (such as TCP/IP) without any adaptation.
On-board Ethernet protocol architecture
Vehicle-borne Ethernet and its supported upper-layer protocol architecture are shown in Figure 1. Vehicle-borne Ethernet mainly involves OSI layer 1 and Layer 2 technologies, while vehicle-borne Ethernet also supports AVB, TCP/IP, DOIP, SOME/IP and other protocols or application forms.
On-board Ethernet framework
Among them, AVB is an extension of traditional Ethernet functions, which enhances the real-time performance of traditional Ethernet audio and video transmission by adding precise clock synchronization, bandwidth reservation and other protocols, and is a network audio and video real-time transmission technology with great development potential. SOME/IP (Scalable Service-Oriented MiddlewarE on IP) specifies the video communication interface requirements for vehicle camera applications, which can be applied to the field of vehicle cameras, and realizes the mode control of driver assistance cameras through apis.
As an extension of AVB protocol, Time-Sensitive Networking (TSN) introduces related technologies of time-triggered Ethernet, which can efficiently realize the transmission of automotive control information. In addition, the on-board Ethernet of the 1Gbit communication standard also supports Power Over Ethernet (POE) function and Energy-Efficient Ethernet (EEE) function. The POE function provides power for connected terminal devices while transmitting data through twisted pair cables, eliminating the need to connect external power cables to terminals and reducing the complexity of power supply.
On-board Ethernet standardization
In terms of in-vehicle Ethernet standardization, the IEEE802.3 and IEEE802.1 working groups, AUTOSAR, the OPEN Alliance and the AVnu Alliance have played a major role in promoting it.
The IEEE802.3 local area network standard represents the mainstream Ethernet standard in the industry, and the on-board Ethernet technology is developed on the basis of IEEE802.3, so the IEEE is currently the most important international standardization body for on-board Ethernet. In order to meet the requirements of the car, it involves the development of a number of new specifications and the revision of the original specifications within the two working groups of IEEE802 and 802.1, including PHY specifications, AVB specifications, and single-wire to data line power supply. In addition, AVB related to AV transmission, timing synchronization and other specifications also need to be standardized by other technical committees of IEEE, such as IEEE1722 and IEEE1588.
OPEN Alliance
The OPEN Industry Alliance was launched in November 2011 by Broadcom, NXP, and BMW to promote the application of Ethernet-based technology standards to in-car connectivity. The main standardization goal is to develop a 100Mbit/s BroadR-R physical layer standard and develop OPEN interoperability requirements.
AUTOSAR
AUTOSAR is a consortium of automotive manufacturers, suppliers, and tool developers that aims to develop an open, standardized automotive software architecture, and the AUTOSAR specification already includes the automotive TCP/UDP/IP protocol stack.
AVnu
The AVnu Alliance was formed by Broadcom in collaboration with Cisco, Harman and Intel to promote the IEEE 802.1 AVB standard and the Time Synchronization Network (TSN) standard, establish a certification system, and address important technical and performance issues such as precise timing, real-time synchronization, bandwidth reservation, and traffic shaping.
Vehicle Router,Vehicle 4G Router,Vehicle 4G Wireless Router,Vehicle Wifi Router
Shenzhen MovingComm Technology Co., Ltd. , https://www.movingcommtech.com