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MaximMAX20049双路降压转换器和双路LDO稳压器解决方案

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Maxim公司的MAX20049是双路降压转换器和双路低压降(LDO)稳压器.双路降压转换器固定频率PWM工作,输入电压从5V到17V,而MAX20049C输入电压则从4V到17V.器件多所有的四个输出轨提供电压监测.当过压或欠压检测到,电源良好状态进入高阻抗.输出电压出厂时根据各种传感器图像需要设定为3.3V, 3.0V, 2.9V, 2.8V或 2.7V;串行化器和存储器的电源则为1.8V,1.2V,1.1V和小于1.0V.电压保护特性包括逐个周期的电流限制,带自动恢复的热关断,降压转换器工作在180°相差.它是业界ADAS应用中最小的PMIC.汽车AEC-Q100规范,主要用在照相机模块如环绕,后端和前端,以及点负载.本文介绍了MAX20049主要特性和优势,典型应用电路,以及评估板MAX20049 EVK主要特性和应用方案与电路图.

The MAX20049 is a dual step-down converter IC with two low-dropout regulators (LDOs), providing a single-chip solution for automotive cameras. The two step-down con­verters are designed for fixed-frequency PWM operation with input voltages from 5V to 17V for MAX20049 and 4V to 17V for MAX20049C. The dedicated high-voltage inputs allow for a flexible solution.

The IC provides voltage monitoring on all four output rails. Once an overvoltage or undervoltage is detected, power good goes high impedance. To accommodate long and inexpensive coax cables, the device has a 500mV SUP1 hysteresis. Both bucks offer very low on-time and allow operation from 17V input to 0.9V output. High-frequency operation allows for an all-ceramic capacitor design and small-size external components. The low-resistance on-chip switches ensure high efficiency while minimizing critical inductances.

Output voltages are factory set and cover various sensor imag­ers needing 3.3V, 3.0V, 2.9V, 2.8V, or 2.7V. The secondary supplies cover the typical 1.8V, 1.2V, 1.1V, and < 1.0V rails for the serializer and memory. The Output-Voltage Selection section covers all the voltage options for flexibility in the camera design.

Protection features include cycle-by-cycle current limit, and thermal shutdown with automatic recovery. The buck converters operate 180° out.

MAX20049主要特性和优势:

Small Solution Size 16-Pin Side-Wettable (3mm x 3mm) TQFN with an Exposed Pad Low On-Time Architecture Eliminates the Need for Cascading Bucks
Wide 4V to 17V Input Voltage Range for Power- Over-Coax Cables
Fixed Output-Voltage Options
EMI Solutions Optional Spread-Spectrum Frequency Modulation
Pinout Placement Allows for Tight PCB Layout of Switching Nodes
Self-Protected and Robust Overvoltage and Undervoltage Monitoring, Over­voltage Protection, Thermal Shutdown, and Short- Circuit Protection
500mV Input Hysteresis Allows for Long, Low-Cost Cables During Slow Starts
Automotive Ready Automotive Temperature Range
AEC-Q100 Qualified

MAX20049应用:

Camera Module—Surround, Rear, Front
Point of Load

图1.MAX20049典型应用电路

图2. MAX20049典型应用电路:同轴电缆直接给LDO加电,以改善系统效率

评估板MAX20049 EVK

The MAX20049 evaluation kit (EV kit) is a fully assembled and tested application circuit for the MAX20049 mini dual step-down converters with dual LDOs. The EV kit is set up to provide four output voltages from one single input-voltage source. Both step-down converters (OUT1, OUT2) and LDO3 can accept a high input-voltage source (17V max). The IC also features a high-PSRR and low-noise LDO3. Each step-down converter can deliver up to 500mA load current, whereas LDO3 delivers 100mA and LDO4 400mA.

图3.评估板MAX20049 EVK外形图

评估板MAX20049 EVK主要特性:

MAX20049ATEA/VY+ Installed (Other IC Options Available):
VOUT1 = 3.8V
VOUT2 = 1.8V
VOUT3 = 3.3V
VOUT4 = 1.2V
Inductors Installed Balance Size and Efficiency (see Bill of Materials)
PGOOD PCB Pad Provided for Voltage Monitoring
Configurable SUP1 and SUP2 Using Resistors R4 and R5
Selectable LDOIN3 Input Using Jumper JU1
Proven PCB Layout
Fully Assembled and Tested
评估板MAX20049 EVK应用:
Camera Module — Surround, Rear, Front
Point of Load

图4.单片单电源解决方案

图5.MAX20049 EVK 3路解决方案配置图

图6.评估板MAX20049 EVK电路图
详情请见:
https://datasheets.maximintegrated.com/en/ds/MAX20049.pdf
和https://datasheets.maximintegrated.com/en/ds/MAX20049EVKIT.pdf
MAX20049.pdf
MAX20049EVKIT.pdf

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